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【android bluetooth 协议分析 10】【AVRCP详解1】【PlaybackStateCompat类如何查看】

news 来源：原创 2025/6/26 13:27:06

1. 问题

  • android/app/src/com/android/bluetooth/avrcpcontroller/AvrcpControllerService.java
import android.support.v4.media.MediaBrowserCompat.MediaItem;
import android.support.v4.media.session.PlaybackStateCompat;private int toPlaybackStateFromJni(int fromJni) {int playbackState = PlaybackStateCompat.STATE_NONE;switch (fromJni) {case JNI_PLAY_STATUS_STOPPED:playbackState = PlaybackStateCompat.STATE_STOPPED;break;case JNI_PLAY_STATUS_PLAYING:playbackState = PlaybackStateCompat.STATE_PLAYING;break;case JNI_PLAY_STATUS_PAUSED:playbackState = PlaybackStateCompat.STATE_PAUSED;break;case JNI_PLAY_STATUS_FWD_SEEK:playbackState = PlaybackStateCompat.STATE_FAST_FORWARDING;break;case JNI_PLAY_STATUS_REV_SEEK:playbackState = PlaybackStateCompat.STATE_REWINDING;break;default:playbackState = PlaybackStateCompat.STATE_NONE;}return playbackState;}

在遇到 aosp bt 相关源码时， 发现在源码中并没有 类似于 PlaybackStateCompat.java 对应的源码。

那此时我们该如何 知道他对应的内容呢？

  • 这个类属于 Android Support Library（兼容包），不是 AOSP 系统源码的一部分。
  • 而是作为 prebuilt 集成到我们的 aosp 中的。
    • prebuilts/sdk/current/androidx/m2repository/androidx/media/media/1.6.0-rc01/media-1.6.0-rc01-sources.jar
    • prebuilts/sdk/current/androidx/m2repository/androidx/media/media/1.6.0-rc01/media-1.6.0-rc01.aar

2. 如何找到对应的 PlaybackStateCompat

1. 方法一

直接打开 prebuilts/sdk/current/androidx/m2repository/androidx/media/media/1.6.0-rc01/media-1.6.0-rc01-sources.jar

![[playbackstatecompat_0.png]]

/** Copyright (C) 2014 The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package android.support.v4.media.session;import static androidx.annotation.RestrictTo.Scope.LIBRARY;
import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP_PREFIX;import android.annotation.SuppressLint;
import android.media.session.PlaybackState;
import android.os.Build;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.os.SystemClock;
import android.text.TextUtils;
import android.view.KeyEvent;import androidx.annotation.DoNotInline;
import androidx.annotation.IntDef;
import androidx.annotation.LongDef;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.annotation.RestrictTo;import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.ArrayList;
import java.util.List;/*** Playback state for a {@link MediaSessionCompat}. This includes a state like* {@link PlaybackStateCompat#STATE_PLAYING}, the current playback position,* and the current control capabilities.*/
@SuppressLint("BanParcelableUsage")
public final class PlaybackStateCompat implements Parcelable {/*** @hide*/@RestrictTo(LIBRARY_GROUP_PREFIX) // used by media2-session@LongDef(flag=true, value={ACTION_STOP, ACTION_PAUSE, ACTION_PLAY, ACTION_REWIND,ACTION_SKIP_TO_PREVIOUS, ACTION_SKIP_TO_NEXT, ACTION_FAST_FORWARD, ACTION_SET_RATING,ACTION_SEEK_TO, ACTION_PLAY_PAUSE, ACTION_PLAY_FROM_MEDIA_ID, ACTION_PLAY_FROM_SEARCH,ACTION_SKIP_TO_QUEUE_ITEM, ACTION_PLAY_FROM_URI, ACTION_PREPARE,ACTION_PREPARE_FROM_MEDIA_ID, ACTION_PREPARE_FROM_SEARCH, ACTION_PREPARE_FROM_URI,ACTION_SET_REPEAT_MODE, ACTION_SET_SHUFFLE_MODE, ACTION_SET_CAPTIONING_ENABLED,ACTION_SET_PLAYBACK_SPEED})@Retention(RetentionPolicy.SOURCE)public @interface Actions {}/*** @hide*/@RestrictTo(LIBRARY)@LongDef({ACTION_STOP, ACTION_PAUSE, ACTION_PLAY, ACTION_REWIND, ACTION_SKIP_TO_PREVIOUS,ACTION_SKIP_TO_NEXT, ACTION_FAST_FORWARD, ACTION_PLAY_PAUSE})@Retention(RetentionPolicy.SOURCE)public @interface MediaKeyAction {}/*** Indicates this session supports the stop command.** @see Builder#setActions(long)*/public static final long ACTION_STOP = 1 << 0;/*** Indicates this session supports the pause command.** @see Builder#setActions(long)*/public static final long ACTION_PAUSE = 1 << 1;/*** Indicates this session supports the play command.** @see Builder#setActions(long)*/public static final long ACTION_PLAY = 1 << 2;/*** Indicates this session supports the rewind command.** @see Builder#setActions(long)*/public static final long ACTION_REWIND = 1 << 3;/*** Indicates this session supports the previous command.** @see Builder#setActions(long)*/public static final long ACTION_SKIP_TO_PREVIOUS = 1 << 4;/*** Indicates this session supports the next command.** @see Builder#setActions(long)*/public static final long ACTION_SKIP_TO_NEXT = 1 << 5;/*** Indicates this session supports the fast forward command.** @see Builder#setActions(long)*/public static final long ACTION_FAST_FORWARD = 1 << 6;/*** Indicates this session supports the set rating command.** @see Builder#setActions(long)*/public static final long ACTION_SET_RATING = 1 << 7;/*** Indicates this session supports the seek to command.** @see Builder#setActions(long)*/public static final long ACTION_SEEK_TO = 1 << 8;/*** Indicates this session supports the play/pause toggle command.** @see Builder#setActions(long)*/public static final long ACTION_PLAY_PAUSE = 1 << 9;/*** Indicates this session supports the play from media id command.** @see Builder#setActions(long)*/public static final long ACTION_PLAY_FROM_MEDIA_ID = 1 << 10;/*** Indicates this session supports the play from search command.** @see Builder#setActions(long)*/public static final long ACTION_PLAY_FROM_SEARCH = 1 << 11;/*** Indicates this session supports the skip to queue item command.** @see Builder#setActions(long)*/public static final long ACTION_SKIP_TO_QUEUE_ITEM = 1 << 12;/*** Indicates this session supports the play from URI command.** @see Builder#setActions(long)*/public static final long ACTION_PLAY_FROM_URI = 1 << 13;/*** Indicates this session supports the prepare command.** @see Builder#setActions(long)*/public static final long ACTION_PREPARE = 1 << 14;/*** Indicates this session supports the prepare from media id command.** @see Builder#setActions(long)*/public static final long ACTION_PREPARE_FROM_MEDIA_ID = 1 << 15;/*** Indicates this session supports the prepare from search command.** @see Builder#setActions(long)*/public static final long ACTION_PREPARE_FROM_SEARCH = 1 << 16;/*** Indicates this session supports the prepare from URI command.** @see Builder#setActions(long)*/public static final long ACTION_PREPARE_FROM_URI = 1 << 17;/*** Indicates this session supports the set repeat mode command.** @see Builder#setActions(long)*/public static final long ACTION_SET_REPEAT_MODE = 1 << 18;/*** Indicates this session supports the set shuffle mode enabled command.** @see Builder#setActions(long)* @deprecated Use {@link #ACTION_SET_SHUFFLE_MODE} instead.*/@Deprecatedpublic static final long ACTION_SET_SHUFFLE_MODE_ENABLED = 1 << 19;/*** Indicates this session supports the set captioning enabled command.** @see Builder#setActions(long)*/public static final long ACTION_SET_CAPTIONING_ENABLED = 1 << 20;/*** Indicates this session supports the set shuffle mode command.** @see Builder#setActions(long)*/public static final long ACTION_SET_SHUFFLE_MODE = 1 << 21;/*** Indicates this session supports the set playback speed command.** @see Builder#setActions(long)*/public static final long ACTION_SET_PLAYBACK_SPEED = 1 << 22;/*** @hide*/@RestrictTo(LIBRARY_GROUP_PREFIX) // used by media2-session@IntDef({STATE_NONE, STATE_STOPPED, STATE_PAUSED, STATE_PLAYING, STATE_FAST_FORWARDING,STATE_REWINDING, STATE_BUFFERING, STATE_ERROR, STATE_CONNECTING,STATE_SKIPPING_TO_PREVIOUS, STATE_SKIPPING_TO_NEXT, STATE_SKIPPING_TO_QUEUE_ITEM})@Retention(RetentionPolicy.SOURCE)public @interface State {}/*** This is the default playback state and indicates that no media has been* added yet, or the performer has been reset and has no content to play.** @see Builder#setState*/public final static int STATE_NONE = 0;/*** State indicating this item is currently stopped.** @see Builder#setState*/public final static int STATE_STOPPED = 1;/*** State indicating this item is currently paused.** @see Builder#setState*/public final static int STATE_PAUSED = 2;/*** State indicating this item is currently playing.** @see Builder#setState*/public final static int STATE_PLAYING = 3;/*** State indicating this item is currently fast forwarding.** @see Builder#setState*/public final static int STATE_FAST_FORWARDING = 4;/*** State indicating this item is currently rewinding.** @see Builder#setState*/public final static int STATE_REWINDING = 5;/*** State indicating this item is currently buffering and will begin playing* when enough data has buffered.** @see Builder#setState*/public final static int STATE_BUFFERING = 6;/*** State indicating this item is currently in an error state. The error* code should also be set when entering this state.** @see Builder#setState* @see Builder#setErrorMessage(int, CharSequence)*/public final static int STATE_ERROR = 7;/*** State indicating the class doing playback is currently connecting to a* route. Depending on the implementation you may return to the previous* state when the connection finishes or enter {@link #STATE_NONE}. If* the connection failed {@link #STATE_ERROR} should be used.* <p>* On devices earlier than API 21, this will appear as {@link #STATE_BUFFERING}* </p>** @see Builder#setState*/public final static int STATE_CONNECTING = 8;/*** State indicating the player is currently skipping to the previous item.** @see Builder#setState*/public final static int STATE_SKIPPING_TO_PREVIOUS = 9;/*** State indicating the player is currently skipping to the next item.** @see Builder#setState*/public final static int STATE_SKIPPING_TO_NEXT = 10;/*** State indicating the player is currently skipping to a specific item in* the queue.* <p>* On devices earlier than API 21, this will appear as {@link #STATE_SKIPPING_TO_NEXT}* </p>** @see Builder#setState*/public final static int STATE_SKIPPING_TO_QUEUE_ITEM = 11;/*** Use this value for the position to indicate the position is not known.*/public final static long PLAYBACK_POSITION_UNKNOWN = -1;/*** @hide*/@RestrictTo(LIBRARY_GROUP_PREFIX) // used by media2-session@IntDef({REPEAT_MODE_INVALID, REPEAT_MODE_NONE, REPEAT_MODE_ONE, REPEAT_MODE_ALL,REPEAT_MODE_GROUP})@Retention(RetentionPolicy.SOURCE)public @interface RepeatMode {}/*** {@link MediaControllerCompat.TransportControls#getRepeatMode} returns this value* when the session is not ready for providing its repeat mode.*/public static final int REPEAT_MODE_INVALID = -1;/*** Use this value with {@link MediaControllerCompat.TransportControls#setRepeatMode}* to indicate that the playback will be stopped at the end of the playing media list.*/public static final int REPEAT_MODE_NONE = 0;/*** Use this value with {@link MediaControllerCompat.TransportControls#setRepeatMode}* to indicate that the playback of the current playing media item will be repeated.*/public static final int REPEAT_MODE_ONE = 1;/*** Use this value with {@link MediaControllerCompat.TransportControls#setRepeatMode}* to indicate that the playback of the playing media list will be repeated.*/public static final int REPEAT_MODE_ALL = 2;/*** Use this value with {@link MediaControllerCompat.TransportControls#setRepeatMode}* to indicate that the playback of the playing media group will be repeated.* A group is a logical block of media items which is specified in the section 5.7 of the* Bluetooth AVRCP 1.6.*/public static final int REPEAT_MODE_GROUP = 3;/*** @hide*/@RestrictTo(LIBRARY_GROUP_PREFIX) // used by media2-session@IntDef({SHUFFLE_MODE_INVALID, SHUFFLE_MODE_NONE, SHUFFLE_MODE_ALL, SHUFFLE_MODE_GROUP})@Retention(RetentionPolicy.SOURCE)public @interface ShuffleMode {}/*** {@link MediaControllerCompat.TransportControls#getShuffleMode} returns this value* when the session is not ready for providing its shuffle mode.*/public static final int SHUFFLE_MODE_INVALID = -1;/*** Use this value with {@link MediaControllerCompat.TransportControls#setShuffleMode}* to indicate that the media list will be played in order.*/public static final int SHUFFLE_MODE_NONE = 0;/*** Use this value with {@link MediaControllerCompat.TransportControls#setShuffleMode}* to indicate that the media list will be played in shuffled order.*/public static final int SHUFFLE_MODE_ALL = 1;/*** Use this value with {@link MediaControllerCompat.TransportControls#setShuffleMode}* to indicate that the media group will be played in shuffled order.* A group is a logical block of media items which is specified in the section 5.7 of the* Bluetooth AVRCP 1.6.*/public static final int SHUFFLE_MODE_GROUP = 2;@IntDef({ERROR_CODE_UNKNOWN_ERROR, ERROR_CODE_APP_ERROR, ERROR_CODE_NOT_SUPPORTED,ERROR_CODE_AUTHENTICATION_EXPIRED, ERROR_CODE_PREMIUM_ACCOUNT_REQUIRED,ERROR_CODE_CONCURRENT_STREAM_LIMIT, ERROR_CODE_PARENTAL_CONTROL_RESTRICTED,ERROR_CODE_NOT_AVAILABLE_IN_REGION, ERROR_CODE_CONTENT_ALREADY_PLAYING,ERROR_CODE_SKIP_LIMIT_REACHED, ERROR_CODE_ACTION_ABORTED, ERROR_CODE_END_OF_QUEUE})@Retention(RetentionPolicy.SOURCE)private @interface ErrorCode {}/*** This is the default error code and indicates that none of the other error codes applies.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_UNKNOWN_ERROR = 0;/*** Error code when the application state is invalid to fulfill the request.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_APP_ERROR = 1;/*** Error code when the request is not supported by the application.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_NOT_SUPPORTED = 2;/*** Error code when the request cannot be performed because authentication has expired.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_AUTHENTICATION_EXPIRED = 3;/*** Error code when a premium account is required for the request to succeed.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_PREMIUM_ACCOUNT_REQUIRED = 4;/*** Error code when too many concurrent streams are detected.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_CONCURRENT_STREAM_LIMIT = 5;/*** Error code when the content is blocked due to parental controls.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_PARENTAL_CONTROL_RESTRICTED = 6;/*** Error code when the content is blocked due to being regionally unavailable.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_NOT_AVAILABLE_IN_REGION = 7;/*** Error code when the requested content is already playing.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_CONTENT_ALREADY_PLAYING = 8;/*** Error code when the application cannot skip any more songs because skip limit is reached.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_SKIP_LIMIT_REACHED = 9;/*** Error code when the action is interrupted due to some external event.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_ACTION_ABORTED = 10;/*** Error code when the playback navigation (previous, next) is not possible because the queue* was exhausted.* The error code should be set when entering {@link #STATE_ERROR}.*/public static final int ERROR_CODE_END_OF_QUEUE = 11;// KeyEvent constants only available on API 11+private static final int KEYCODE_MEDIA_PAUSE = 127;private static final int KEYCODE_MEDIA_PLAY = 126;/*** Translates a given action into a matched key code defined in {@link KeyEvent}. The given* action should be one of the following:* <ul>* <li>{@link PlaybackStateCompat#ACTION_PLAY}</li>* <li>{@link PlaybackStateCompat#ACTION_PAUSE}</li>* <li>{@link PlaybackStateCompat#ACTION_SKIP_TO_NEXT}</li>* <li>{@link PlaybackStateCompat#ACTION_SKIP_TO_PREVIOUS}</li>* <li>{@link PlaybackStateCompat#ACTION_STOP}</li>* <li>{@link PlaybackStateCompat#ACTION_FAST_FORWARD}</li>* <li>{@link PlaybackStateCompat#ACTION_REWIND}</li>* <li>{@link PlaybackStateCompat#ACTION_PLAY_PAUSE}</li>* </ul>** @param action The action to be translated.** @return the key code matched to the given action.*/public static int toKeyCode(@MediaKeyAction long action) {if (action == ACTION_PLAY) {return KEYCODE_MEDIA_PLAY;} else if (action == ACTION_PAUSE) {return KEYCODE_MEDIA_PAUSE;} else if (action == ACTION_SKIP_TO_NEXT) {return KeyEvent.KEYCODE_MEDIA_NEXT;} else if (action == ACTION_SKIP_TO_PREVIOUS) {return KeyEvent.KEYCODE_MEDIA_PREVIOUS;} else if (action == ACTION_STOP) {return KeyEvent.KEYCODE_MEDIA_STOP;} else if (action == ACTION_FAST_FORWARD) {return KeyEvent.KEYCODE_MEDIA_FAST_FORWARD;} else if (action == ACTION_REWIND) {return KeyEvent.KEYCODE_MEDIA_REWIND;} else if (action == ACTION_PLAY_PAUSE) {return KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE;}return KeyEvent.KEYCODE_UNKNOWN;}final int mState;final long mPosition;final long mBufferedPosition;final float mSpeed;final long mActions;final int mErrorCode;final CharSequence mErrorMessage;final long mUpdateTime;List<PlaybackStateCompat.CustomAction> mCustomActions;final long mActiveItemId;final Bundle mExtras;private PlaybackState mStateFwk;PlaybackStateCompat(int state, long position, long bufferedPosition,float rate, long actions, int errorCode, CharSequence errorMessage, long updateTime,List<PlaybackStateCompat.CustomAction> customActions,long activeItemId, Bundle extras) {mState = state;mPosition = position;mBufferedPosition = bufferedPosition;mSpeed = rate;mActions = actions;mErrorCode = errorCode;mErrorMessage = errorMessage;mUpdateTime = updateTime;mCustomActions = new ArrayList<>(customActions);mActiveItemId = activeItemId;mExtras = extras;}PlaybackStateCompat(Parcel in) {mState = in.readInt();mPosition = in.readLong();mSpeed = in.readFloat();mUpdateTime = in.readLong();mBufferedPosition = in.readLong();mActions = in.readLong();mErrorMessage = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(in);mCustomActions = in.createTypedArrayList(CustomAction.CREATOR);mActiveItemId = in.readLong();mExtras = in.readBundle(MediaSessionCompat.class.getClassLoader());// New attributes should be added at the end for backward compatibility.mErrorCode = in.readInt();}@Overridepublic String toString() {StringBuilder bob = new StringBuilder("PlaybackState {");bob.append("state=").append(mState);bob.append(", position=").append(mPosition);bob.append(", buffered position=").append(mBufferedPosition);bob.append(", speed=").append(mSpeed);bob.append(", updated=").append(mUpdateTime);bob.append(", actions=").append(mActions);bob.append(", error code=").append(mErrorCode);bob.append(", error message=").append(mErrorMessage);bob.append(", custom actions=").append(mCustomActions);bob.append(", active item id=").append(mActiveItemId);bob.append("}");return bob.toString();}@Overridepublic int describeContents() {return 0;}@Overridepublic void writeToParcel(Parcel dest, int flags) {dest.writeInt(mState);dest.writeLong(mPosition);dest.writeFloat(mSpeed);dest.writeLong(mUpdateTime);dest.writeLong(mBufferedPosition);dest.writeLong(mActions);TextUtils.writeToParcel(mErrorMessage, dest, flags);dest.writeTypedList(mCustomActions);dest.writeLong(mActiveItemId);dest.writeBundle(mExtras);// New attributes should be added at the end for backward compatibility.dest.writeInt(mErrorCode);}/*** Get the current state of playback. One of the following:* <ul>* <li> {@link PlaybackStateCompat#STATE_NONE}</li>* <li> {@link PlaybackStateCompat#STATE_STOPPED}</li>* <li> {@link PlaybackStateCompat#STATE_PLAYING}</li>* <li> {@link PlaybackStateCompat#STATE_PAUSED}</li>* <li> {@link PlaybackStateCompat#STATE_FAST_FORWARDING}</li>* <li> {@link PlaybackStateCompat#STATE_REWINDING}</li>* <li> {@link PlaybackStateCompat#STATE_BUFFERING}</li>* <li> {@link PlaybackStateCompat#STATE_ERROR}</li>* <li> {@link PlaybackStateCompat#STATE_CONNECTING}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_PREVIOUS}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_NEXT}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_QUEUE_ITEM}</li>*/@Statepublic int getState() {return mState;}/*** Get the playback position in ms at last position update time.*/public long getPosition() {return mPosition;}/*** Get the elapsed real time at which position was last updated. If the* position has never been set this will return 0;** @return The last time the position was updated.*/public long getLastPositionUpdateTime() {return mUpdateTime;}/*** Get the current playback position in ms.** @param timeDiff Only used for testing, otherwise it should be null.* @return The current playback position in ms* @hide*/@RestrictTo(LIBRARY_GROUP_PREFIX) // accessed by media2-sessionpublic long getCurrentPosition(Long timeDiff) {long expectedPosition = mPosition + (long) (mSpeed * ((timeDiff != null) ? timeDiff : SystemClock.elapsedRealtime() - mUpdateTime));return Math.max(0, expectedPosition);}/*** Get the current buffered position in ms. This is the farthest playback* point that can be reached from the current position using only buffered* content.*/public long getBufferedPosition() {return mBufferedPosition;}/*** Get the current playback speed as a multiple of normal playback. This* should be negative when rewinding. A value of 1 means normal playback and* 0 means paused.** @return The current speed of playback.*/public float getPlaybackSpeed() {return mSpeed;}/*** Get the current actions available on this session. This should use a* bitmask of the available actions.* <ul>* <li> {@link PlaybackStateCompat#ACTION_SKIP_TO_PREVIOUS}</li>* <li> {@link PlaybackStateCompat#ACTION_REWIND}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_PAUSE}</li>* <li> {@link PlaybackStateCompat#ACTION_PAUSE}</li>* <li> {@link PlaybackStateCompat#ACTION_STOP}</li>* <li> {@link PlaybackStateCompat#ACTION_FAST_FORWARD}</li>* <li> {@link PlaybackStateCompat#ACTION_SKIP_TO_NEXT}</li>* <li> {@link PlaybackStateCompat#ACTION_SEEK_TO}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_RATING}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_FROM_MEDIA_ID}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_FROM_SEARCH}</li>* <li> {@link PlaybackStateCompat#ACTION_SKIP_TO_QUEUE_ITEM}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_FROM_URI}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE_FROM_MEDIA_ID}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE_FROM_SEARCH}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE_FROM_URI}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_REPEAT_MODE}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_SHUFFLE_MODE}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_CAPTIONING_ENABLED}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_PLAYBACK_SPEED}</li>* </ul>*/@Actionspublic long getActions() {return mActions;}/*** Get the list of custom actions.*/public List<PlaybackStateCompat.CustomAction> getCustomActions() {return mCustomActions;}/*** Get the error code. This should be set when the state is* {@link PlaybackStateCompat#STATE_ERROR}.** @see #ERROR_CODE_UNKNOWN_ERROR* @see #ERROR_CODE_APP_ERROR* @see #ERROR_CODE_NOT_SUPPORTED* @see #ERROR_CODE_AUTHENTICATION_EXPIRED* @see #ERROR_CODE_PREMIUM_ACCOUNT_REQUIRED* @see #ERROR_CODE_CONCURRENT_STREAM_LIMIT* @see #ERROR_CODE_PARENTAL_CONTROL_RESTRICTED* @see #ERROR_CODE_NOT_AVAILABLE_IN_REGION* @see #ERROR_CODE_CONTENT_ALREADY_PLAYING* @see #ERROR_CODE_SKIP_LIMIT_REACHED* @see #ERROR_CODE_ACTION_ABORTED* @see #ERROR_CODE_END_OF_QUEUE* @see #getErrorMessage()*/@ErrorCodepublic int getErrorCode() {return mErrorCode;}/*** Get the user readable optional error message. This may be set when the state is* {@link PlaybackStateCompat#STATE_ERROR}.** @see #getErrorCode()*/public CharSequence getErrorMessage() {return mErrorMessage;}/*** Get the id of the currently active item in the queue. If there is no* queue or a queue is not supported by the session this will be* {@link MediaSessionCompat.QueueItem#UNKNOWN_ID}.** @return The id of the currently active item in the queue or*         {@link MediaSessionCompat.QueueItem#UNKNOWN_ID}.*/public long getActiveQueueItemId() {return mActiveItemId;}/*** Get any custom extras that were set on this playback state.** @return The extras for this state or null.*/public @Nullable Bundle getExtras() {return mExtras;}/*** Creates an instance from a framework {@link android.media.session.PlaybackState} object.* <p>* This method is only supported on API 21+.* </p>** @param stateObj A {@link android.media.session.PlaybackState} object, or null if none.* @return An equivalent {@link PlaybackStateCompat} object, or null if none.*/public static PlaybackStateCompat fromPlaybackState(Object stateObj) {if (stateObj != null && Build.VERSION.SDK_INT >= 21) {PlaybackState stateFwk = (PlaybackState) stateObj;List<PlaybackState.CustomAction> customActionFwks =Api21Impl.getCustomActions(stateFwk);List<PlaybackStateCompat.CustomAction> customActions = null;if (customActionFwks != null) {customActions = new ArrayList<>(customActionFwks.size());for (Object customActionFwk : customActionFwks) {customActions.add(CustomAction.fromCustomAction(customActionFwk));}}Bundle extras;if (Build.VERSION.SDK_INT >= 22) {extras = Api22Impl.getExtras(stateFwk);MediaSessionCompat.ensureClassLoader(extras);} else {extras = null;}PlaybackStateCompat stateCompat = new PlaybackStateCompat(Api21Impl.getState(stateFwk),Api21Impl.getPosition(stateFwk),Api21Impl.getBufferedPosition(stateFwk),Api21Impl.getPlaybackSpeed(stateFwk),Api21Impl.getActions(stateFwk),ERROR_CODE_UNKNOWN_ERROR,Api21Impl.getErrorMessage(stateFwk),Api21Impl.getLastPositionUpdateTime(stateFwk),customActions,Api21Impl.getActiveQueueItemId(stateFwk),extras);stateCompat.mStateFwk = stateFwk;return stateCompat;} else {return null;}}/*** Gets the underlying framework {@link android.media.session.PlaybackState} object.* <p>* This method is only supported on API 21+.* </p>** @return An equivalent {@link android.media.session.PlaybackState} object, or null if none.*/public Object getPlaybackState() {if (mStateFwk == null && Build.VERSION.SDK_INT >= 21) {PlaybackState.Builder builder = Api21Impl.createBuilder();Api21Impl.setState(builder, mState, mPosition, mSpeed, mUpdateTime);Api21Impl.setBufferedPosition(builder, mBufferedPosition);Api21Impl.setActions(builder, mActions);Api21Impl.setErrorMessage(builder, mErrorMessage);for (PlaybackStateCompat.CustomAction customAction : mCustomActions) {Api21Impl.addCustomAction(builder,(PlaybackState.CustomAction) customAction.getCustomAction());}Api21Impl.setActiveQueueItemId(builder, mActiveItemId);if (Build.VERSION.SDK_INT >= 22) {Api22Impl.setExtras(builder, mExtras);}mStateFwk = Api21Impl.build(builder);}return mStateFwk;}public static final Parcelable.Creator<PlaybackStateCompat> CREATOR =new Parcelable.Creator<PlaybackStateCompat>() {@Overridepublic PlaybackStateCompat createFromParcel(Parcel in) {return new PlaybackStateCompat(in);}@Overridepublic PlaybackStateCompat[] newArray(int size) {return new PlaybackStateCompat[size];}};/*** {@link PlaybackStateCompat.CustomAction CustomActions} can be used to* extend the capabilities of the standard transport controls by exposing* app specific actions to {@link MediaControllerCompat Controllers}.*/public static final class CustomAction implements Parcelable {private final String mAction;private final CharSequence mName;private final int mIcon;private final Bundle mExtras;private PlaybackState.CustomAction mCustomActionFwk;/*** Use {@link PlaybackStateCompat.CustomAction.Builder#build()}.*/CustomAction(String action, CharSequence name, int icon, Bundle extras) {mAction = action;mName = name;mIcon = icon;mExtras = extras;}CustomAction(Parcel in) {mAction = in.readString();mName = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(in);mIcon = in.readInt();mExtras = in.readBundle(MediaSessionCompat.class.getClassLoader());}@Overridepublic void writeToParcel(Parcel dest, int flags) {dest.writeString(mAction);TextUtils.writeToParcel(mName, dest, flags);dest.writeInt(mIcon);dest.writeBundle(mExtras);}@Overridepublic int describeContents() {return 0;}/*** Creates an instance from a framework* {@link android.media.session.PlaybackState.CustomAction} object.* <p>* This method is only supported on API 21+.* </p>** @param customActionObj A {@link android.media.session.PlaybackState.CustomAction} object,* or null if none.* @return An equivalent {@link PlaybackStateCompat.CustomAction} object, or null if none.*/public static PlaybackStateCompat.CustomAction fromCustomAction(Object customActionObj) {if (customActionObj == null || Build.VERSION.SDK_INT < 21) {return null;}PlaybackState.CustomAction customActionFwk =(PlaybackState.CustomAction) customActionObj;Bundle extras = Api21Impl.getExtras(customActionFwk);MediaSessionCompat.ensureClassLoader(extras);PlaybackStateCompat.CustomAction customActionCompat =new PlaybackStateCompat.CustomAction(Api21Impl.getAction(customActionFwk),Api21Impl.getName(customActionFwk),Api21Impl.getIcon(customActionFwk),extras);customActionCompat.mCustomActionFwk = customActionFwk;return customActionCompat;}/*** Gets the underlying framework {@link android.media.session.PlaybackState.CustomAction}* object.* <p>* This method is only supported on API 21+.* </p>** @return An equivalent {@link android.media.session.PlaybackState.CustomAction} object,* or null if none.*/public Object getCustomAction() {if (mCustomActionFwk != null || Build.VERSION.SDK_INT < 21) {return mCustomActionFwk;}PlaybackState.CustomAction.Builder builder =Api21Impl.createCustomActionBuilder(mAction, mName, mIcon);Api21Impl.setExtras(builder, mExtras);return Api21Impl.build(builder);}public static final Parcelable.Creator<PlaybackStateCompat.CustomAction> CREATOR= new Parcelable.Creator<PlaybackStateCompat.CustomAction>() {@Overridepublic PlaybackStateCompat.CustomAction createFromParcel(Parcel p) {return new PlaybackStateCompat.CustomAction(p);}@Overridepublic PlaybackStateCompat.CustomAction[] newArray(int size) {return new PlaybackStateCompat.CustomAction[size];}};/*** Returns the action of the {@link CustomAction}.** @return The action of the {@link CustomAction}.*/public String getAction() {return mAction;}/*** Returns the display name of this action. e.g. "Favorite"** @return The display name of this {@link CustomAction}.*/public CharSequence getName() {return mName;}/*** Returns the resource id of the icon in the {@link MediaSessionCompat* Session's} package.** @return The resource id of the icon in the {@link MediaSessionCompat*         Session's} package.*/public int getIcon() {return mIcon;}/*** Returns extras which provide additional application-specific* information about the action, or null if none. These arguments are* meant to be consumed by a {@link MediaControllerCompat} if it knows* how to handle them.** @return Optional arguments for the {@link CustomAction}.*/public Bundle getExtras() {return mExtras;}@Overridepublic String toString() {return "Action:" +"mName='" + mName +", mIcon=" + mIcon +", mExtras=" + mExtras;}/*** Builder for {@link CustomAction} objects.*/public static final class Builder {private final String mAction;private final CharSequence mName;private final int mIcon;private Bundle mExtras;/*** Creates a {@link CustomAction} builder with the id, name, and* icon set.** @param action The action of the {@link CustomAction}.* @param name The display name of the {@link CustomAction}. This*            name will be displayed along side the action if the UI*            supports it.* @param icon The icon resource id of the {@link CustomAction}.*            This resource id must be in the same package as the*            {@link MediaSessionCompat}. It will be displayed with*            the custom action if the UI supports it.*/public Builder(String action, CharSequence name, int icon) {if (TextUtils.isEmpty(action)) {throw new IllegalArgumentException("You must specify an action to build a CustomAction");}if (TextUtils.isEmpty(name)) {throw new IllegalArgumentException("You must specify a name to build a CustomAction");}if (icon == 0) {throw new IllegalArgumentException("You must specify an icon resource id to build a CustomAction");}mAction = action;mName = name;mIcon = icon;}/*** Set optional extras for the {@link CustomAction}. These extras* are meant to be consumed by a {@link MediaControllerCompat} if it* knows how to handle them. Keys should be fully qualified (e.g.* "com.example.MY_ARG") to avoid collisions.** @param extras Optional extras for the {@link CustomAction}.* @return this.*/public Builder setExtras(Bundle extras) {mExtras = extras;return this;}/*** Build and return the {@link CustomAction} instance with the* specified values.** @return A new {@link CustomAction} instance.*/public CustomAction build() {return new CustomAction(mAction, mName, mIcon, mExtras);}}}/*** Builder for {@link PlaybackStateCompat} objects.*/public static final class Builder {private final List<PlaybackStateCompat.CustomAction> mCustomActions = new ArrayList<>();private int mState;private long mPosition;private long mBufferedPosition;private float mRate;private long mActions;private int mErrorCode;private CharSequence mErrorMessage;private long mUpdateTime;private long mActiveItemId = MediaSessionCompat.QueueItem.UNKNOWN_ID;private Bundle mExtras;/*** Create an empty Builder.*/public Builder() {}/*** Create a Builder using a {@link PlaybackStateCompat} instance to set the* initial values.** @param source The playback state to copy.*/public Builder(PlaybackStateCompat source) {mState = source.mState;mPosition = source.mPosition;mRate = source.mSpeed;mUpdateTime = source.mUpdateTime;mBufferedPosition = source.mBufferedPosition;mActions = source.mActions;mErrorCode = source.mErrorCode;mErrorMessage = source.mErrorMessage;if (source.mCustomActions != null) {mCustomActions.addAll(source.mCustomActions);}mActiveItemId = source.mActiveItemId;mExtras = source.mExtras;}/*** Set the current state of playback.* <p>* The position must be in ms and indicates the current playback* position within the track. If the position is unknown use* {@link #PLAYBACK_POSITION_UNKNOWN}.* <p>* The rate is a multiple of normal playback and should be 0 when paused* and negative when rewinding. Normal playback rate is 1.0.* <p>* The state must be one of the following:* <ul>* <li> {@link PlaybackStateCompat#STATE_NONE}</li>* <li> {@link PlaybackStateCompat#STATE_STOPPED}</li>* <li> {@link PlaybackStateCompat#STATE_PLAYING}</li>* <li> {@link PlaybackStateCompat#STATE_PAUSED}</li>* <li> {@link PlaybackStateCompat#STATE_FAST_FORWARDING}</li>* <li> {@link PlaybackStateCompat#STATE_REWINDING}</li>* <li> {@link PlaybackStateCompat#STATE_BUFFERING}</li>* <li> {@link PlaybackStateCompat#STATE_ERROR}</li>* <li> {@link PlaybackStateCompat#STATE_CONNECTING}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_PREVIOUS}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_NEXT}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_QUEUE_ITEM}</li>* </ul>** @param state The current state of playback.* @param position The position in the current track in ms.* @param playbackSpeed The current rate of playback as a multiple of*            normal playback.*/public Builder setState(@State int state, long position, float playbackSpeed) {return setState(state, position, playbackSpeed, SystemClock.elapsedRealtime());}/*** Set the current state of playback.* <p>* The position must be in ms and indicates the current playback* position within the track. If the position is unknown use* {@link #PLAYBACK_POSITION_UNKNOWN}.* <p>* The rate is a multiple of normal playback and should be 0 when paused* and negative when rewinding. Normal playback rate is 1.0.* <p>* The state must be one of the following:* <ul>* <li> {@link PlaybackStateCompat#STATE_NONE}</li>* <li> {@link PlaybackStateCompat#STATE_STOPPED}</li>* <li> {@link PlaybackStateCompat#STATE_PLAYING}</li>* <li> {@link PlaybackStateCompat#STATE_PAUSED}</li>* <li> {@link PlaybackStateCompat#STATE_FAST_FORWARDING}</li>* <li> {@link PlaybackStateCompat#STATE_REWINDING}</li>* <li> {@link PlaybackStateCompat#STATE_BUFFERING}</li>* <li> {@link PlaybackStateCompat#STATE_ERROR}</li>* <li> {@link PlaybackStateCompat#STATE_CONNECTING}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_PREVIOUS}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_NEXT}</li>* <li> {@link PlaybackStateCompat#STATE_SKIPPING_TO_QUEUE_ITEM}</li>* </ul>** @param state The current state of playback.* @param position The position in the current item in ms.* @param playbackSpeed The current speed of playback as a multiple of*            normal playback.* @param updateTime The time in the {@link SystemClock#elapsedRealtime}*            timebase that the position was updated at.* @return this*/public Builder setState(@State int state, long position, float playbackSpeed,long updateTime) {mState = state;mPosition = position;mUpdateTime = updateTime;mRate = playbackSpeed;return this;}/*** Set the current buffered position in ms. This is the farthest* playback point that can be reached from the current position using* only buffered content.** @return this*/public Builder setBufferedPosition(long bufferPosition) {mBufferedPosition = bufferPosition;return this;}/*** Set the current capabilities available on this session. This should* use a bitmask of the available capabilities.* <ul>* <li> {@link PlaybackStateCompat#ACTION_SKIP_TO_PREVIOUS}</li>* <li> {@link PlaybackStateCompat#ACTION_REWIND}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_PAUSE}</li>* <li> {@link PlaybackStateCompat#ACTION_PAUSE}</li>* <li> {@link PlaybackStateCompat#ACTION_STOP}</li>* <li> {@link PlaybackStateCompat#ACTION_FAST_FORWARD}</li>* <li> {@link PlaybackStateCompat#ACTION_SKIP_TO_NEXT}</li>* <li> {@link PlaybackStateCompat#ACTION_SEEK_TO}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_RATING}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_FROM_MEDIA_ID}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_FROM_SEARCH}</li>* <li> {@link PlaybackStateCompat#ACTION_SKIP_TO_QUEUE_ITEM}</li>* <li> {@link PlaybackStateCompat#ACTION_PLAY_FROM_URI}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE_FROM_MEDIA_ID}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE_FROM_SEARCH}</li>* <li> {@link PlaybackStateCompat#ACTION_PREPARE_FROM_URI}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_REPEAT_MODE}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_SHUFFLE_MODE}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_CAPTIONING_ENABLED}</li>* <li> {@link PlaybackStateCompat#ACTION_SET_PLAYBACK_SPEED}</li>* </ul>** @return this*/public Builder setActions(@Actions long capabilities) {mActions = capabilities;return this;}/*** Add a custom action to the playback state. Actions can be used to* expose additional functionality to {@link MediaControllerCompat* Controllers} beyond what is offered by the standard transport* controls.* <p>* e.g. start a radio station based on the current item or skip ahead by* 30 seconds.** @param action An identifier for this action. It can be sent back to*            the {@link MediaSessionCompat} through*            {@link MediaControllerCompat.TransportControls#sendCustomAction(String, Bundle)}.* @param name The display name for the action. If text is shown with*            the action or used for accessibility, this is what should*            be used.* @param icon The resource action of the icon that should be displayed*            for the action. The resource should be in the package of*            the {@link MediaSessionCompat}.* @return this*/public Builder addCustomAction(String action, String name, int icon) {return addCustomAction(new PlaybackStateCompat.CustomAction(action, name, icon, null));}/*** Add a custom action to the playback state. Actions can be used to expose additional* functionality to {@link MediaControllerCompat Controllers} beyond what is offered* by the standard transport controls.* <p>* An example of an action would be to start a radio station based on the current item* or to skip ahead by 30 seconds.** @param customAction The custom action to add to the {@link PlaybackStateCompat}.* @return this*/public Builder addCustomAction(PlaybackStateCompat.CustomAction customAction) {if (customAction == null) {throw new IllegalArgumentException("You may not add a null CustomAction to PlaybackStateCompat");}mCustomActions.add(customAction);return this;}/*** Set the active item in the play queue by specifying its id. The* default value is {@link MediaSessionCompat.QueueItem#UNKNOWN_ID}** @param id The id of the active item.* @return this*/public Builder setActiveQueueItemId(long id) {mActiveItemId = id;return this;}/*** Set a user readable error message. This should be set when the state* is {@link PlaybackStateCompat#STATE_ERROR}.** @return this* @deprecated Use {@link #setErrorMessage(int, CharSequence)} instead.*/@Deprecatedpublic Builder setErrorMessage(CharSequence errorMessage) {mErrorMessage = errorMessage;return this;}/*** Set the error code with an optional user readable error message. This should be set when* the state is {@link PlaybackStateCompat#STATE_ERROR}.** @param errorCode The errorCode to set.* @param errorMessage The user readable error message. Can be null.* @return this*/public Builder setErrorMessage(@ErrorCode int errorCode, CharSequence errorMessage) {mErrorCode = errorCode;mErrorMessage = errorMessage;return this;}/*** Set any custom extras to be included with the playback state.** @param extras The extras to include.* @return this*/public Builder setExtras(Bundle extras) {mExtras = extras;return this;}/*** Creates the playback state object.*/public PlaybackStateCompat build() {return new PlaybackStateCompat(mState, mPosition, mBufferedPosition,mRate, mActions, mErrorCode, mErrorMessage, mUpdateTime,mCustomActions, mActiveItemId, mExtras);}}@RequiresApi(21)private static class Api21Impl {private Api21Impl() {}@DoNotInlinestatic PlaybackState.Builder createBuilder() {return new PlaybackState.Builder();}@DoNotInlinestatic void setState(PlaybackState.Builder builder, int state, long position,float playbackSpeed, long updateTime) {builder.setState(state, position, playbackSpeed, updateTime);}@DoNotInlinestatic void setBufferedPosition(PlaybackState.Builder builder, long bufferedPosition) {builder.setBufferedPosition(bufferedPosition);}@DoNotInlinestatic void setActions(PlaybackState.Builder builder, long actions) {builder.setActions(actions);}@DoNotInlinestatic void setErrorMessage(PlaybackState.Builder builder, CharSequence error) {builder.setErrorMessage(error);}@DoNotInlinestatic void addCustomAction(PlaybackState.Builder builder,PlaybackState.CustomAction customAction) {builder.addCustomAction(customAction);}@DoNotInlinestatic void setActiveQueueItemId(PlaybackState.Builder builder, long id) {builder.setActiveQueueItemId(id);}@DoNotInlinestatic List<PlaybackState.CustomAction> getCustomActions(PlaybackState state) {return state.getCustomActions();}@DoNotInlinestatic PlaybackState build(PlaybackState.Builder builder) {return builder.build();}@DoNotInlinestatic int getState(PlaybackState state) {return state.getState();}@DoNotInlinestatic long getPosition(PlaybackState state) {return state.getPosition();}@DoNotInlinestatic long getBufferedPosition(PlaybackState state) {return state.getBufferedPosition();}@DoNotInlinestatic float getPlaybackSpeed(PlaybackState state) {return state.getPlaybackSpeed();}@DoNotInlinestatic long getActions(PlaybackState state) {return state.getActions();}@DoNotInlinestatic CharSequence getErrorMessage(PlaybackState state) {return state.getErrorMessage();}@DoNotInlinestatic long getLastPositionUpdateTime(PlaybackState state) {return state.getLastPositionUpdateTime();}@DoNotInlinestatic long getActiveQueueItemId(PlaybackState state) {return state.getActiveQueueItemId();}@DoNotInlinestatic PlaybackState.CustomAction.Builder createCustomActionBuilder(String action,CharSequence name, int icon) {return new PlaybackState.CustomAction.Builder(action, name, icon);}@DoNotInlinestatic void setExtras(PlaybackState.CustomAction.Builder builder, Bundle extras) {builder.setExtras(extras);}@DoNotInlinestatic PlaybackState.CustomAction build(PlaybackState.CustomAction.Builder builder) {return builder.build();}@DoNotInlinestatic Bundle getExtras(PlaybackState.CustomAction customAction) {return customAction.getExtras();}@DoNotInlinestatic String getAction(PlaybackState.CustomAction customAction) {return customAction.getAction();}@DoNotInlinestatic CharSequence getName(PlaybackState.CustomAction customAction) {return customAction.getName();}@DoNotInlinestatic int getIcon(PlaybackState.CustomAction customAction) {return customAction.getIcon();}}@RequiresApi(22)private static class Api22Impl {private Api22Impl() {}@DoNotInlinestatic void setExtras(PlaybackState.Builder builder, Bundle extras) {builder.setExtras(extras);}@DoNotInlinestatic Bundle getExtras(PlaybackState state) {return state.getExtras();}}
}

2.方式二：

方式二采用反编译的方式，直接从 .class 文件 获取。

1. 提取 classes.jar

打开 prebuilts/sdk/current/androidx/m2repository/androidx/media/media/1.6.0-rc01/media-1.6.0-rc01.aar

在这里插入图片描述

  • 解压提取 出 classes.jar 文件

2. 安装 jadx

  • jadx-1.5.2.zip

  • 同时也可以从我 csdn 资源中下载

解压就可以在 ubuntu 下使用。

jadx-1.5.2$ tree
.
├── bin
│   ├── jadx
│   ├── jadx.bat
│   ├── jadx-gui
│   └── jadx-gui.bat
├── lib
│   └── jadx-1.5.2-all.jar
├── LICENSE
└── README.md

3. 提取 classes.jar

启动 jadx-gui 在界面里面打开 classes.jar , 找到对应的目录下， 就可以看到将 class 文件反编译为 java.

在这里插入图片描述

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