WebView 选择相册图片踩坑

最近在为公司的几个H5项目做app打包，然后就踩到这个坑了。
项目中有 h5调用相册选择图片，然后上传这个功能，测试说上传不了图片。然后搜了不少资料，折腾了一下午，终于搞好了，特此记录下。

原生WebView 的选择图片功能需要我们自己实现，代码如下：

wv_main.setWebChromeClient(new WebChromeClient() {
            // Andorid 4.1----4.4
            public void openFileChooser(ValueCallback<uri> uploadFile, String acceptType, String capture) {
 
                mFilePathCallback = uploadFile;
                handle(uploadFile);
            }
 
            // for 5.0+
            @Override
            public boolean onShowFileChooser(WebView webView, ValueCallback<uri[]> filePathCallback, FileChooserParams fileChooserParams) {
                if (mFilePathCallbackArray != null) {
                    mFilePathCallbackArray.onReceiveValue(null);
                }
                mFilePathCallbackArray = filePathCallback;
                handleup(filePathCallback);
                return true;
            }
 
 
        });
    }
 
    private void handle(ValueCallback<uri> uploadFile) {
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, PICK_REQUEST);
    }
 
    private void handleup(ValueCallback<uri[]> uploadFile) {
 
        Intent intent = new Intent(Intent.ACTION_PICK);
        intent.setType("image/*");
        startActivityForResult(intent, PICK_REQUEST);
    }

然后在Activity的onActivityResult 方法里处理回调，代码如下：

@Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
 
       if (requestCode == PICK_REQUEST) {
           if (null != data) {
               Uri uri = data.getData();
               handleCallback(uri);
           } else {
               // 取消了照片选取的时候调用
               handleCallback(null);
           }
       } else {
           // 取消了照片选取的时候调用
           handleCallback(null);
       }
 
 
   }

/**
     * 处理WebView的回调
     *
     * @param uri
     */
    private void handleCallback(Uri uri) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            if (mFilePathCallbackArray != null) {
                if (uri != null) {
                    mFilePathCallbackArray.onReceiveValue(new Uri[]{uri});
                } else {
                    mFilePathCallbackArray.onReceiveValue(null);
                }
                mFilePathCallbackArray = null;
            }
        } else {
            if (mFilePathCallback != null) {
                if (uri != null) {
                    String url = getFilePathFromContentUri(uri, getContentResolver());
                    Uri u = Uri.fromFile(new File(url));
 
                    mFilePathCallback.onReceiveValue(u);
                } else {
                    mFilePathCallback.onReceiveValue(null);
                }
                mFilePathCallback = null;
            }
        }
    }

坑1：记得一定要释放，不然点取消之后，就再调不起来了（一下午主要就填这个坑了）

4.1-4.4
 mFilePathCallback.onReceiveValue(null);
5.0
mFilePathCallbackArray.onReceiveValue(null);

坑2：4.4以下，返回的Uri 是content: 开头的，h5端识别不了，需要转成绝对路径

public static String getFilePathFromContentUri(Uri selectedVideoUri,
                                                   ContentResolver contentResolver) {
        String filePath;
        String[] filePathColumn = {MediaStore.MediaColumns.DATA};
 
        Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null, null, null);
//      也可用下面的方法拿到cursor
//      Cursor cursor = this.context.managedQuery(selectedVideoUri, filePathColumn, null, null, null);
 
        cursor.moveToFirst();
 
        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
        filePath = cursor.getString(columnIndex);
        cursor.close();
        return filePath;
    }