轉載自原文地址
style="?android:attr/progressBarStyleHorizontal"在WebView的開發過程中當你需要使用到一些高級功能可以通過設置WebChromeClient從而來輔助WebView處理 javaScript 的對話框、網站圖標、網站title、加載進度等。
WebChromeClient常用的API方法
1.通知應用程序當前網頁加載的進度
12 | @Overridepublic void onProgressChanged(WebView view, int newProgress) |
12 | @Overridepublic void onReceivedTitle(WebView view, String title) |
獲取標題的時間主要取決于網頁前段設置標題的位置，一般設置在頁面加載前面，可以較早調用到這個函數
12 | @Overridepublic void onShowCustomView(View view, CustomViewCallback callback) |
對應的取消全屏方法
12 | @Overridepublic void onHideCustomView() |
通過設置webview下載監聽進而監聽網頁下載
12345 | mWebView.setDownloadListener(new DownloadListener() { @Override public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) { }}); |
一般可在downloadStart 處進行下載處理
在Android 5.0 API 21后 借助新的 onShowFileChooser() 方法,您現在不但可以在 WebView 中使用輸入表單字段,而且可以啟動文件選擇器從 Android 設備中選擇圖片和文件
12345678910111213141516171819202122232425262728293031323334353637383940414243444546 | public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) { if (mFilePathCallback != null) { mFilePathCallback.onReceiveValue(null); } mFilePathCallback = filePathCallback; Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if (takePictureIntent.resolveActivity(getPackageManager()) != null) { // Create the File where the photo should go File photoFile = null; try { photoFile = createImageFile(); takePictureIntent.putExtra("PhotoPath", mCameraPhotoPath); } catch (IOException ex) { // Error occurred while creating the File Log.e(TAG, "Unable to create Image File", ex); } // Continue only if the File was successfully created if (photoFile != null) { mCameraPhotoPath = "file:" + photoFile.getAbsolutePath(); takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile)); } else { takePictureIntent = null; } } Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT); contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE); contentSelectionIntent.setType("image/*"); Intent[] intentArray; if (takePictureIntent != null) { intentArray = new Intent[]{takePictureIntent}; } else { intentArray = new Intent[0]; } Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER); chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent); chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser"); chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray); startActivityForResult(chooserIntent, INPUT_FILE_REQUEST_CODE); return true;} |
在選擇完圖片后回調onActivityResult 獲取圖片
12345678910111213141516171819202122232425262728 | @Overridepublic void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode != INPUT_FILE_REQUEST_CODE || mFilePathCallback == null) { super.onActivityResult(requestCode, resultCode, data); return; } Uri[] results = null; // Check that the response is a good one if (resultCode == Activity.RESULT_OK) { if (data == null) { // If there is not data, then we may have taken a photo if (mCameraPhotoPath != null) { results = new Uri[]{Uri.parse(mCameraPhotoPath)}; } } else { String dataString = data.getDataString(); if (dataString != null) { results = new Uri[]{Uri.parse(dataString)}; } } } mFilePathCallback.onReceiveValue(results); mFilePathCallback = null; return;} |
設置webview視頻未播放時默認顯示占位圖
123456789 | @Overridepublic Bitmap getDefaultVideoPoster() { if(getActivity() == null) { return null; } return BitmapFactory.decodeResource(getActivity().getapplicationContext().getResources(), R.drawable.video_poster);} |
視頻播放全屏時調用
12345678910111213141516171819202122232425262728293031323334 | @Overridepublic void onShowCustomView(View view, WebChromeClient.CustomViewCallback callback) { // if a view already exists then immediately terminate the new one if (mCustomView != null) { onHideCustomView(); return; } // 1. Stash the current state mCustomView = view; mOriginalSystemUiVisibility = getActivity().getWindow().getDecorView().getSystemUiVisibility(); mOriginalOrientation = getActivity().getRequestedOrientation(); // 2. Stash the custom view callback mCustomViewCallback = callback; // 3. Add the custom view to the view hierarchy FrameLayout decor = (FrameLayout) getActivity().getWindow().getDecorView(); decor.addView(mCustomView, new FrameLayout.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); // 4. Change the state of the window getActivity().getWindow().getDecorView().setSystemUiVisibility( View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN | View.SYSTEM_UI_FLAG_IMMERSIVE); getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);} |
視頻取消全屏時候調用
1234567891011121314151617 | @Overridepublic void onHideCustomView() { // 1. Remove the custom view FrameLayout decor = (FrameLayout) getActivity().getWindow().getDecorView(); decor.removeView(mCustomView); mCustomView = null; // 2. Restore the state to it's original form getActivity().getWindow().getDecorView() .setSystemUiVisibility(mOriginalSystemUiVisibility); getActivity().setRequestedOrientation(mOriginalOrientation); // 3. Call the custom view callback mCustomViewCallback.onCustomViewHidden(); mCustomViewCallback = null;} |
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