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在android开发中，用webview嵌套页面遇到的问题

1. 在用android开发应用中，遇到一个场景，是需要用webview嵌套一个上传文件的页面，当时遇到两个问题：

• 选择文件的窗口没有弹出
• 选中的文件和页面没有关联

2. 针对第一个问题，最开始我是只调用了webView.setWebViewClient(new WebViewClient());，此时页面能正常打开，但是点击选择文件的时候，没有反应，处理的方式是，需要设置webView.setWebChromeClient(new WebChromeClient() )，且需要重写WebChromeClient方法，不然，还是没有办法弹窗选择文件的窗口，下面是重写的方式，至此，第一个问题就可以解决了

webView.setWebChromeClient(new WebChromeClient() {@Overridepublic boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {GameSDKActivity.mFilePathCallback = filePathCallback;Intent intent = fileChooserParams.createIntent();try {mActivity.startActivityForResult(intent, GameSDKActivity.FILE_CHOOSER_REQUEST_CODE);} catch (ActivityNotFoundException e) {GameSDKActivity.mFilePathCallback = null;Toast.makeText(mActivity, "无法打开文件选择器", Toast.LENGTH_SHORT).show();return false;}return true;}});

3. 针对第二个问题，是因为Activity的回调函数onActivityResult 没有针对的功能实现，因为在View中调用mActivity.startActivityForResult的时候，传入FILE_CHOOSER_REQUEST_CODE，所有在Activity中需要对requestCode为FILE_CHOOSER_REQUEST_CODE的结果进行处理，简单说明如下：

@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == FILE_CHOOSER_REQUEST_CODE) {// 业务处理}
}

详细代码如下

页面布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><WebViewandroid:id="@+id/webview"android:layout_width="match_parent"android:layout_height="match_parent"android:visibility="visible" /></LinearLayout>

View代码

private void showFileTrans() {Dialog dialog = new Dialog(mActivity);dialog.setContentView(R.layout.dialog_webview);dialog.setCancelable(true);dialog.setCanceledOnTouchOutside(true);// 设置对话框样式Window window = dialog.getWindow();if (window != null) {WindowManager.LayoutParams params = window.getAttributes();DisplayMetrics displayMetrics = new DisplayMetrics();window.getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);int screenWidth = displayMetrics.widthPixels;int screenHeight = displayMetrics.heightPixels;int minWidth = (int) (280 * mActivity.getResources().getDisplayMetrics().density);int maxWidth = (int) (screenWidth * 0.8);int dialogWidth = Math.min(maxWidth, Math.max(minWidth, (int) (320 * mActivity.getResources().getDisplayMetrics().density)));params.width = dialogWidth;params.height = (int) (screenHeight * 0.8); // 推荐用80%屏高params.gravity = Gravity.CENTER;window.setAttributes(params);}WebView webView = dialog.findViewById(R.id.webview);WebSettings settings = webView.getSettings();settings.setJavaScriptEnabled(true);settings.setDomStorageEnabled(true);settings.setAllowFileAccess(true); // 关键：允许文件访问settings.setAllowContentAccess(true); // 关键：允许内容访问settings.setLoadWithOverviewMode(true);settings.setUseWideViewPort(true);settings.setBuiltInZoomControls(true);settings.setDisplayZoomControls(false);settings.setSupportZoom(true);settings.setDefaultTextEncodingName("utf-8");settings.setCacheMode(WebSettings.LOAD_DEFAULT);settings.setMediaPlaybackRequiresUserGesture(false);if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {webView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);}webView.setWebViewClient(new WebViewClient());webView.setWebChromeClient(new WebChromeClient() {@Overridepublic boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {GameSDKActivity.mFilePathCallback = filePathCallback;Intent intent = fileChooserParams.createIntent();try {mActivity.startActivityForResult(intent, GameSDKActivity.FILE_CHOOSER_REQUEST_CODE);} catch (ActivityNotFoundException e) {GameSDKActivity.mFilePathCallback = null;Toast.makeText(mActivity, "无法打开文件选择器", Toast.LENGTH_SHORT).show();return false;}return true;}});webView.loadUrl("http://xxxxxxx");dialog.show();
}

Activity代码

public static ValueCallback<Uri[]> mFilePathCallback;
public static final int FILE_CHOOSER_REQUEST_CODE = 10001;@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == FILE_CHOOSER_REQUEST_CODE) {if (mFilePathCallback != null) {Uri[] results = null;if (resultCode == Activity.RESULT_OK) {if (data == null) {// 处理拍照等特殊情况Log.d("FileChooser", "data is null");} else {ClipData clipData = data.getClipData();if (clipData != null) {// 多选文件int count = clipData.getItemCount();results = new Uri[count];for (int i = 0; i < count; i++) {results[i] = clipData.getItemAt(i).getUri();Log.d("FileChooser", "Selected file: " + results[i]);}} else if (data.getData() != null) {// 单选文件results = new Uri[]{data.getData()};Log.d("FileChooser", "Selected file: " + results[0]);}}} else {// 用户取消选择Log.d("FileChooser", "User cancelled file selection");}mFilePathCallback.onReceiveValue(results);mFilePathCallback = null;}}}