Android 解决WebView无法上传文件的问题

 private ValueCallback<Uri[]> uploadMessageAboveL;  private final static int FILE_CHOOSER_RESULT_CODE = 10000;  private ValueCallback<Uri> uploadMessage;

  private void openImageChooserActivity() {    Intent i = new Intent(Intent.ACTION_GET_CONTENT);    i.addCategory(Intent.CATEGORY_OPENABLE);    i.setType("image/*");    startActivityForResult(Intent.createChooser(i, "Image Chooser"), FILE_CHOOSER_RESULT_CODE);  }  @Override  protected void onActivityResult(int requestCode, int resultCode, Intent data) {    super.onActivityResult(requestCode, resultCode, data);    if (requestCode == FILE_CHOOSER_RESULT_CODE) {      if (null == uploadMessage && null == uploadMessageAboveL) return;      Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();      if (uploadMessageAboveL != null) {        onActivityResultAboveL(requestCode, resultCode, data);      } else if (uploadMessage != null) {        uploadMessage.onReceiveValue(result);        uploadMessage = null;      }    }  }  @TargetApi(Build.VERSION_CODES.LOLLIPOP)  private void onActivityResultAboveL(int requestCode, int resultCode, Intent intent) {    if (requestCode != FILE_CHOOSER_RESULT_CODE || uploadMessageAboveL == null)      return;    Uri[] results = null;    if (resultCode == Activity.RESULT_OK) {      if (intent != null) {        String dataString = intent.getDataString();        ClipData clipData = intent.getClipData();        if (clipData != null) {          results = new Uri[clipData.getItemCount()];          for (int i = 0; i < clipData.getItemCount(); i++) {            ClipData.Item item = clipData.getItemAt(i);            results[i] = item.getUri();          }        }        if (dataString != null)          results = new Uri[]{Uri.parse(dataString)};      }    }    uploadMessageAboveL.onReceiveValue(results);    uploadMessageAboveL = null;  }

 // For Android < 3.0    public void openFileChooser(ValueCallback<Uri> valueCallback) {      uploadMessage = valueCallback;      openImageChooserActivity();    }    // For Android >= 3.0    public void openFileChooser(ValueCallback valueCallback, String acceptType) {      uploadMessage = valueCallback;      openImageChooserActivity();    }    //For Android >= 4.1    public void openFileChooser(ValueCallback<Uri> valueCallback, String acceptType, String capture) {      uploadMessage = valueCallback;      openImageChooserActivity();    }    // For Android >= 5.0    @Override    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {      uploadMessageAboveL = filePathCallback;      openImageChooserActivity();      return true;    }