关于Android dialog

1.设置dialog为系统dialog

		AlertDialog dialog = new AlertDialog.Builder(mContext).setTitle("dd").setMessage("fhjk").setPositiveButton("quer",null).create();dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);dialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM|WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);dialog.setCanceledOnTouchOutside(false);dialog.show();

2.监听home键按下：Intent.ACTION_CLOSE_SYSTEM_DIALOGS

public class CustomDialog extends Dialog {private CloseSystemDialogsReceiver mCloseSystemDialogsReceiver;private Window mWindow;public CustomDialog(Context context) {super(context);setContentView(R.layout.view_custom);mWindow = this.getWindow();LayoutParams attributes = mWindow.getAttributes();attributes.width = mWindow.getWindowManager().getDefaultDisplay().getWidth();attributes.height = LayoutParams.MATCH_PARENT;mWindow.setType(LayoutParams.TYPE_SYSTEM_ALERT);IntentFilter filter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);mCloseSystemDialogsReceiver = new CloseSystemDialogsReceiver();mWindow.getContext().registerReceiver(mCloseSystemDialogsReceiver,filter);}private class CloseSystemDialogsReceiver extends BroadcastReceiver {final String SYSTEM_DIALOG_REASON_KEY = "reason";final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";@Overridepublic void onReceive(Context context, Intent intent) {if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(intent.getAction())) {String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)) {CustomSymbolDialog.this.dismiss();mWindow.getContext().unregisterReceiver(mCloseSystemDialogsReceiver);}}}}
}

3.dialog 按下power键不重新显示 遮挡UI 解决方法 重新：dismiss和show

class WakeAndLockReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {if (intent == null) return;if (Intent.ACTION_SCREEN_ON.equals(intent.getAction())) {AppLockPreferenceController.alertDialog.show();}if (Intent.ACTION_SCREEN_OFF.equals(intent.getAction())) {AppLockPreferenceController.alertDialog.dismiss();}}}

4.dialog 过大，一页显示不下 

使用 NestedScrollView包裹动态设置

dialog中弹出软键盘总是把布局顶到顶部挤压，这时候需要把根布局设置成

NestedScrollView 包裹动态设置

setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);