公司项目，需要在webview中调起相册和拍照，网上文章照搬照抄一大堆，一个都不好使，系统兼容性，品牌兼容性，问题多多，我直接上代码：
重写WebViewChromeClient中的方法：

public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
            openFileChooserImpl(uploadMsg);
        }

        //3.0--版本
        public void openFileChooser(ValueCallback<Uri> uploadMsg) {
            openFileChooserImpl(uploadMsg);
        }

        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
            openFileChooserImpl(uploadMsg);
        }

        // For Android > 5.0
        public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> uploadMsg, WebChromeClient.FileChooserParams fileChooserParams) {
            openFileChooserImplForAndroid5(uploadMsg);
            return true;
        }

根据系统不同调用不同方法，如下：

private void openFileChooserImpl(ValueCallback<Uri> uploadMsg) {
        mUploadMessage = uploadMsg;
        Intent chooserIntent = IntentUtil.createImageChooserIntent(getString(R.string.carowner_register_select_image_source));
        startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
    }

    private void openFileChooserImplForAndroid5(ValueCallback<Uri[]> uploadMsg) {
        mUploadCallbackAboveL = uploadMsg;
        Intent chooserIntent = IntentUtil.createImageChooserIntent(getString(R.string.carowner_register_select_image_source));
        startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE_FOR_ANDROID_5);
    }

接下来是IntentUtil中的方法：

/**
   * 返回获取图片Intent，包含相册选择和拍照二项
   * @param title picker标题
   * @return intent
   */
  public static Intent createImageChooserIntent(final String title) {
    Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
    contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
    contentSelectionIntent.setType("image/*");

    Intent galleryIntent = new Intent(
            Intent.ACTION_GET_CONTENT,
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

    Intent takePhotoIntent = takePhoto();

    Intent chooserIntent = Intent.createChooser(galleryIntent, title);
    chooserIntent.putExtra
            (
                    Intent.EXTRA_INITIAL_INTENTS,
                    new Intent[]{takePhotoIntent}
            );
    return chooserIntent;
  }

  static Uri imageUri;
  private static Intent takePhoto() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    try {
      if (Build.VERSION.SDK_INT >= 24) {
        imageUri = FileProvider.getUriForFile(BaseApplication.getApplication(),
                "com.yongche.provider",
                createImageFile());
      } else {
        imageUri = Uri.fromFile(createImageFile());
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    if (imageUri != null) {
      takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    }
    return takePictureIntent;
  }

  /**
   * 拍照后创建临时文件，供上传使用
   * @return
   * @throws IOException
   */
  private static File createImageFile() throws IOException {
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = BaseApplication.getApplication().getExternalFilesDir(Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  /* prefix */
            ".jpg",         /* suffix */
            storageDir      /* directory */
    );

    return image;
  }

  public static Uri getImageUri() {
    return imageUri;
  }

最后在调用的Activity中重写OnActivityResult方法：

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (requestCode == FILECHOOSER_RESULTCODE) {
            if (null == mUploadMessage)
                return;

            if (resultCode == RESULT_OK) {
                Uri result = (data == null) ? null : data.getData();
                if (result != null) {
                    mUploadMessage.onReceiveValue(result);
                } else {
                    Uri imageUri = IntentUtil.getImageUri();
                    if (imageUri != null) {
                        mUploadMessage.onReceiveValue(imageUri);
                    }
                }
            }else if (resultCode == RESULT_CANCELED) {
                mUploadMessage.onReceiveValue(null);
            }

            mUploadMessage = null;

        } else if (requestCode == FILECHOOSER_RESULTCODE_FOR_ANDROID_5) {
            if (null == mUploadCallbackAboveL)
                return;
            if (resultCode == RESULT_OK) {
                Uri result = (data == null) ? null : data.getData();
                if (result != null) {
                    mUploadCallbackAboveL.onReceiveValue(new Uri[]{result});
                } else {
                    Uri imageUri = IntentUtil.getImageUri();
                    if (imageUri != null) {
                        mUploadCallbackAboveL.onReceiveValue(new Uri[]{imageUri});
                    }
                }
            } else if (resultCode == RESULT_CANCELED) {
                mUploadCallbackAboveL.onReceiveValue(new Uri[]{});
            }
            mUploadCallbackAboveL = null;
        }

        super.onActivityResult(requestCode, resultCode, data);

    }