一般在項目中與js交互，可能會遇到上傳文件圖片等操作，避免不了一些坑，下面簡單說一下，Android 在不同版本中webView調用相機，選擇相冊的方法是不一樣的，3.0以下的調用

public void openFileChooser(ValueCallback<Uri> uploadMsg)3.0以上：

public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType)
4.4以下：

public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)
5.0以上：

public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams)

這里有個漏洞，4.4.x的由于系統內核發生了改變，沒法調用以上方法，現在仍然找不到解決辦法，唯一的方法就是4.4直接使用手機瀏覽器打開，這個是可以的。

那下面具體的貼下代碼：

繼承自WebChromeClient，重寫

//3.0++ public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {openFileChooserImpl(uploadMsg); }//3.0-- public void openFileChooser(ValueCallback<Uri> uploadMsg) {openFileChooserImpl(uploadMsg); }//4.1 public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {openFileChooserImpl(uploadMsg); }@Override public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {openFileChooserImplForAndroid5(filePathCallback); return true; }

外層定義接收返回值：

private ValueCallback<Uri> mUploadMessage; private ValueCallback<Uri[]> mUploadCallbackAboveL;

不同的版本調不同的方法：
private void openFileChooserImplForAndroid5(ValueCallback<Uri[]> uploadMsg) {mUploadCallbackAboveL = uploadMsg; dispatchTakePictureIntent(); }//5.0以下的掉用 private void openFileChooserImpl(ValueCallback<Uri> uploadMsg) {mUploadMessage = uploadMsg; dispatchTakePictureIntent(); }//拍照 private void dispatchTakePictureIntent() {selectImgDialog(); }

我下面就把代碼全部貼出來吧：

private void takePhoto() {Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null) {Uri imageUri = null; try {imageUri = Uri.fromFile(createImageFile()); } catch (IOException e) {e.printStackTrace(); }takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); startActivityForResult(takePictureIntent, FILECHOOSER_RESULTCODE); }}/** * 209. * 本地相冊選擇圖片 * 210. */ private void chosePic() {Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT); String IMAGE_UNSPECIFIED = "image/*"; innerIntent.setType(IMAGE_UNSPECIFIED); // 查看類型 Intent wrapperIntent = Intent.createChooser(innerIntent, null); startActivityForResult(wrapperIntent, REQ_CHOOSE); }String mCurrentPhotoPath = null; String FileName = "forum"; //創建文件夾包裝圖片 private File createImageFile() throws IOException {File storageDir = new File(Util.getAppPath(getActivity()) + FileName); if (!storageDir.exists()) {storageDir.mkdirs(); }storageDir = new File(Util.getAppPath(getActivity()) + FileName + "/", System.currentTimeMillis() + ".jpg"); //保存當前圖片路徑 mCurrentPhotoPath = storageDir.getAbsolutePath(); return storageDir; }//onActivityResult回調 @Override public void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data); if (requestCode == FILECHOOSER_RESULTCODE || requestCode == REQ_CHOOSE) {if (null == mUploadMessage && null == mUploadCallbackAboveL) return; Uri result = data == null || resultCode != RESULT_OK ? null : data.getData(); if (mUploadCallbackAboveL != null) {onActivityResultAboveL(requestCode, data); } else if (mUploadMessage != null) {mUploadMessage.onReceiveValue(result); mUploadMessage = null; }}}//5.0以上版本，由于api不一樣，要單獨處理 // @TargetApi(Build.VERSION_CODES.LOLLIPOP) private void onActivityResultAboveL(int requestCode, Intent data) {if (mUploadCallbackAboveL == null) {return; }Uri result = null; if (requestCode == FILECHOOSER_RESULTCODE) {File file = new File(mCurrentPhotoPath); Uri localUri = Uri.fromFile(file); Intent localIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, localUri); getActivity().sendBroadcast(localIntent); result = Uri.fromFile(file); } else if (requestCode == REQ_CHOOSE) {result = data.getData(); }mUploadCallbackAboveL.onReceiveValue(new Uri[]{result}); mUploadCallbackAboveL = null; return; }

后補的代碼：

private void openFileChooserImplForAndroid5(ValueCallback<Uri[]> uploadMsg) {mUploadCallbackAboveL = uploadMsg; dispatchTakePictureIntent(); }//5.0以下的掉用 private void openFileChooserImpl(ValueCallback<Uri> uploadMsg) {mUploadMessage = uploadMsg; dispatchTakePictureIntent(); }

基本代碼就是以上這些，selectImgDialog()方法是彈窗提示選擇，關于這個彈窗布局的用法，之前寫的一篇文章說的很清楚了(BottomSheet 的詳解及注意事項)，有疑問的歡迎提問。

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