Android应用中WebView无法使用 H5 input type="file" 如何解决

private ValueCallback<Uri> mUploadMessage;public ValueCallback<Uri[]> uploadMessage;public static final int REQUEST_SELECT_FILE = 100;private final static int FILECHOOSER_RESULTCODE = 2;webview.setWebChromeClient(new WebChromeClient(){    // For 3.0+ Devices (Start)    // onActivityResult attached before constructor    protected void openFileChooser(ValueCallback uploadMsg, String acceptType)    {      mUploadMessage = uploadMsg;      Intent i = new Intent(Intent.ACTION_GET_CONTENT);      i.addCategory(Intent.CATEGORY_OPENABLE);      i.setType("image/*");      startActivityForResult(Intent.createChooser(i, "File Browser"), FILECHOOSER_RESULTCODE);    }    // For Lollipop 5.0+ Devices    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams)    {      if (uploadMessage != null) {        uploadMessage.onReceiveValue(null);        uploadMessage = null;      }      uploadMessage = filePathCallback;      Intent intent = fileChooserParams.createIntent();      try      {        startActivityForResult(intent, REQUEST_SELECT_FILE);      } catch (ActivityNotFoundException e)      {        uploadMessage = null;        Toast.makeText(getBaseContext(), "Cannot Open File Chooser", Toast.LENGTH_LONG).show();        return false;      }      return true;    }    //For Android 4.1 only    protected void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)    {      mUploadMessage = uploadMsg;      Intent intent = new Intent(Intent.ACTION_GET_CONTENT);      intent.addCategory(Intent.CATEGORY_OPENABLE);      intent.setType("image/*");      startActivityForResult(Intent.createChooser(intent, "File Browser"), FILECHOOSER_RESULTCODE);    }    protected void openFileChooser(ValueCallback<Uri> uploadMsg)    {      mUploadMessage = uploadMsg;      Intent i = new Intent(Intent.ACTION_GET_CONTENT);      i.addCategory(Intent.CATEGORY_OPENABLE);      i.setType("image/*");      startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);    }  });}@Overridepublic void onActivityResult(int requestCode, int resultCode, Intent intent){  if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)  {    if (requestCode == REQUEST_SELECT_FILE)    {      if (uploadMessage == null)        return;      uploadMessage.onReceiveValue(WebChromeClient.FileChooserParams.parseResult(resultCode, intent));      uploadMessage = null;    }  }  else if (requestCode == FILECHOOSER_RESULTCODE)  {    if (null == mUploadMessage)      return;    // Use MainActivity.RESULT_OK if you're implementing WebView inside Fragment    // Use RESULT_OK only if you're implementing WebView inside an Activity    Uri result = intent == null || resultCode != MainActivity.RESULT_OK &#63; null : intent.getData();    mUploadMessage.onReceiveValue(result);    mUploadMessage = null;  }  else    Toast.makeText(getBaseContext(), "Failed to Upload Image", Toast.LENGTH_LONG).show();}