Android WebView支持input file启用相机/选取照片功能

webView.setWebChromeClient(new WebChromeClient() {
      @Override
      public void onProgressChanged(WebView view, int newProgress) {
        if (newProgress == 100) {
          progressBar.setVisibility(View.GONE);//加载完网页进度条消失
        } else {
          progressBar.setProgress(newProgress);//设置进度值
          progressBar.setVisibility(View.VISIBLE);//开始加载网页时显示进度条
        }
      }
 
      /**
       * 8(Android 2.2) <= API <= 10(Android 2.3)回调此方法
       */
      private void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg) {
        Log.e("WangJ", "运行方法 openFileChooser-1");
        // (2)该方法回调时说明版本API < 21，此时将结果赋值给 mUploadCallbackBelow，使之 != null
        mUploadCallbackBelow = uploadMsg;
        takePhoto();
      }
 
      /**
       * 11(Android 3.0) <= API <= 15(Android 4.0.3)回调此方法
       */
      public void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg, String acceptType) {
        Log.e("WangJ", "运行方法 openFileChooser-2 (acceptType: " + acceptType + ")");
        // 这里我们就不区分input的参数了，直接用拍照
        openFileChooser(uploadMsg);
      }
 
      /**
       * 16(Android 4.1.2) <= API <= 20(Android 4.4W.2)回调此方法
       */
      public void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
        Log.e("WangJ", "运行方法 openFileChooser-3 (acceptType: " + acceptType + "; capture: " + capture + ")");
        // 这里我们就不区分input的参数了，直接用拍照
        openFileChooser(uploadMsg);
      }
 
      /**
       * API >= 21(Android 5.0.1)回调此方法
       */
      @Override
      public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> valueCallback, FileChooserParams fileChooserParams) {
        Log.e("WangJ", "运行方法 onShowFileChooser");
        // (1)该方法回调时说明版本API >= 21，此时将结果赋值给 mUploadCallbackAboveL，使之 != null
        mUploadCallbackAboveL = valueCallback;
        takePhoto();
        return true;
      }
    });

 /**
   * 调用相机
   */
  private void takePhoto() {
    // 指定拍照存储位置的方式调起相机
    String filePath = Environment.getExternalStorageDirectory() + File.separator
        + Environment.DIRECTORY_PICTURES + File.separator;
    String fileName = "IMG_" + DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg";
    imageUri = Uri.fromFile(new File(filePath + fileName));
 
//    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
//    startActivityForResult(intent, REQUEST_CODE);
 
    // 选择图片（不包括相机拍照）,则不用成功后发刷新图库的广播
//    Intent i = new Intent(Intent.ACTION_GET_CONTENT);
//    i.addCategory(Intent.CATEGORY_OPENABLE);
//    i.setType("image/*");
//    startActivityForResult(Intent.createChooser(i, "Image Chooser"), REQUEST_CODE);
 
    Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
 
    Intent Photo = new Intent(Intent.ACTION_PICK,
        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
 
    Intent chooserIntent = Intent.createChooser(Photo, "Image Chooser");
    chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent});
 
    startActivityForResult(chooserIntent, REQUEST_CODE);
  }
onActivityResult回调：
@Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_CODE) {
      // 经过上边(1)、(2)两个赋值操作，此处即可根据其值是否为空来决定采用哪种处理方法
      if (mUploadCallbackBelow != null) {
        chooseBelow(resultCode, data);
      } else if (mUploadCallbackAboveL != null) {
        chooseAbove(resultCode, data);
      } else {
        Toast.makeText(this, "发生错误", Toast.LENGTH_SHORT).show();
      }
    }
  }

/**
   * Android API < 21(Android 5.0)版本的回调处理
   * @param resultCode 选取文件或拍照的返回码
   * @param data 选取文件或拍照的返回结果
   */
  private void chooseBelow(int resultCode, Intent data) {
    Log.e("WangJ", "返回调用方法--chooseBelow");
 
    if (RESULT_OK == resultCode) {
      updatePhotos();
 
      if (data != null) {
        // 这里是针对文件路径处理
        Uri uri = data.getData();
        if (uri != null) {
          Log.e("WangJ", "系统返回URI：" + uri.toString());
          mUploadCallbackBelow.onReceiveValue(uri);
        } else {
          mUploadCallbackBelow.onReceiveValue(null);
        }
      } else {
        // 以指定图像存储路径的方式调起相机，成功后返回data为空
        Log.e("WangJ", "自定义结果：" + imageUri.toString());
        mUploadCallbackBelow.onReceiveValue(imageUri);
      }
    } else {
      mUploadCallbackBelow.onReceiveValue(null);
    }
    mUploadCallbackBelow = null;
  }
 
  /**
   * Android API >= 21(Android 5.0) 版本的回调处理
   * @param resultCode 选取文件或拍照的返回码
   * @param data 选取文件或拍照的返回结果
   */
  private void chooseAbove(int resultCode, Intent data) {
    Log.e("WangJ", "返回调用方法--chooseAbove");
 
    if (RESULT_OK == resultCode) {
      updatePhotos();
 
      if (data != null) {
        // 这里是针对从文件中选图片的处理
        Uri[] results;
        Uri uriData = data.getData();
        if (uriData != null) {
          results = new Uri[]{uriData};
          for (Uri uri : results) {
            Log.e("WangJ", "系统返回URI：" + uri.toString());
          }
          mUploadCallbackAboveL.onReceiveValue(results);
        } else {
          mUploadCallbackAboveL.onReceiveValue(null);
        }
      } else {
        Log.e("WangJ", "自定义结果：" + imageUri.toString());
        mUploadCallbackAboveL.onReceiveValue(new Uri[]{imageUri});
      }
    } else {
      mUploadCallbackAboveL.onReceiveValue(null);
    }
    mUploadCallbackAboveL = null;
  }
 
  private void updatePhotos() {
    // 该广播即使多发（即选取照片成功时也发送）也没有关系，只是唤醒系统刷新媒体文件
    Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    intent.setData(imageUri);
    sendBroadcast(intent);
  }

private android.webkit.ValueCallback<Uri[]> mUploadCallbackAboveL;
private android.webkit.ValueCallback<Uri> mUploadCallbackBelow;
private Uri imageUri;
private int REQUEST_CODE = 1234;