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【Android】WebView的input上传照片的兼容问题

问题

前几天接到的一个需求,是关于第三方理财产品的H5上传照片问题。 对方说他们的新的需求,需要接入方配合上传资产照片的需求,测试之后发现我们这边的app端,IOS端上传没有问题,而Android端则点击没有任何反应。 对方H5调用的方式是通过<input type='file' accept='image/*'/>的方式调用,本来以为这个问题很简单,就是app端没有设置相机权限,造成的点击无反应情况,而实际上加了之后发现,并非简单的权限问题。

解决问题

因为Android的版本碎片问题,很多版本的WebView都对唤起函数有不同的支持。 我们需要重写WebChromeClient下的openFileChooser()(5.0及以上系统回调onShowFileChooser())。我们通过Intent在openFileChooser()中唤起系统相机和支持Intent的相关app。 在系统相机或者相关app中一顿操作之后,当返回app的时候,我们在onActivityResult()中将选择好的图片通过ValueCallbackonReceiveValue方法返回给WebView。

附上代码:

  1. 首先是重写各个版本的WebChromeClient的支持

    webView.setWebChromeClient(new WebChromeClient() {
      //For Android 3.0+
      public void openFileChooser(ValueCallback<Uri> uploadMsg) {
          selectImage();
          mUM = uploadMsg;
          Intent i = new Intent(Intent.ACTION_GET_CONTENT);
          i.addCategory(Intent.CATEGORY_OPENABLE);
          i.setType("*/*");
          MyBaseWebViewActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), FCR);
      }
    
      // For Android 3.0+, above method not supported in some android 3+ versions, in such case we use this
      public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
          selectImage();
          mUM = uploadMsg;
          Intent i = new Intent(Intent.ACTION_GET_CONTENT);
          i.addCategory(Intent.CATEGORY_OPENABLE);
          i.setType("*/*");
          MyBaseWebViewActivity.this.startActivityForResult(
                  Intent.createChooser(i, "File Browser"),
                  FCR);
      }
    
      //For Android 4.1+
      public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
          selectImage();
          mUM = uploadMsg;
          Intent i = new Intent(Intent.ACTION_GET_CONTENT);
          i.addCategory(Intent.CATEGORY_OPENABLE);
          i.setType("*/*");
          MyBaseWebViewActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), MyBaseWebViewActivity.FCR);
      }
    
      //For Android 5.0+
      public boolean onShowFileChooser(
              WebView webView, ValueCallback<Uri[]> filePathCallback,
              WebChromeClient.FileChooserParams fileChooserParams) {
          selectImage();
          if (mUMA != null) {
              mUMA.onReceiveValue(null);
          }
          mUMA = filePathCallback;
          Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
          if (takePictureIntent.resolveActivity(MyBaseWebViewActivity.this.getPackageManager()) != null) {
              File photoFile = null;
              try {
                  photoFile = createImageFile();
                  takePictureIntent.putExtra("PhotoPath", mCM);
              } catch (IOException ex) {
                  Log.e(TAG, "Image file creation failed", ex);
              }
              if (photoFile != null) {
                  mCM = "file:" + photoFile.getAbsolutePath();
                  filePath = photoFile.getAbsolutePath();
                  takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
              } else {
                  takePictureIntent = null;
              }
          }
          Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
          contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
          contentSelectionIntent.setType("*/*");
          Intent[] intentArray;
          if (takePictureIntent != null) {
              intentArray = new Intent[]{takePictureIntent};
          } else {
              intentArray = new Intent[0];
          }
    
          Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
          chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
          chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
          chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
          startActivityForResult(chooserIntent, FCR);
          return true;
      }
    });
    复制代码
  2. 选完照片之后

    /**
    * 打开图库,同时处理图片
    */
    private void selectImage() {
       compressPath = Environment.getExternalStorageDirectory().getPath() + "/QWB/temp";
       File file = new File(compressPath);
       if (!file.exists()) {
           file.mkdirs();
       }
       compressPath = compressPath + File.separator + "compress.png";
       File image = new File(compressPath);
       if (image.exists()) {
           image.delete();
       }
    }
    
    // Create an image file
    private File createImageFile() throws IOException {
       @SuppressLint("SimpleDateFormat") String timeStamp = DateUtils.nowTimeDetail();
       String imageFileName = "img_" + timeStamp + "_";
       File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
       return File.createTempFile(imageFileName, ".jpg", storageDir);
    }
    
    private String mCM;
    private String filePath = "";
    private ValueCallback<Uri> mUM;
    private ValueCallback<Uri[]> mUMA;
    private final static int FCR = 1;
    String compressPath = "";
    
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
       super.onActivityResult(requestCode, resultCode, intent);
       if (Build.VERSION.SDK_INT >= 21) {
           Uri[] results = null;
           //Check if response is positive
           if (resultCode == Activity.RESULT_OK) {
               if (requestCode == FCR) {
                   if (null == mUMA) {
                       return;
                   }
                   if (intent == null) {
                       //Capture Photo if no image available
                       if (mCM != null) {
                           // results = new Uri[]{Uri.parse(mCM)};
                           results = new Uri[]{afterChosePic(filePath, compressPath)};
                       }
                   } else {
                       String dataString = intent.getDataString();
                       if (dataString != null) {
                           results = new Uri[]{Uri.parse(dataString)};
                           LogUtil.d("tag", intent.toString());
    //                            String realFilePath = getRealFilePath(Uri.parse(dataString));
    //                            results = new Uri[]{afterChosePic(realFilePath, compressPath)};
                       }
                   }
               }
           }
           mUMA.onReceiveValue(results);
           mUMA = null;
       } else {
           if (requestCode == FCR) {
               if (null == mUM) return;
               Uri result = intent == null || resultCode != RESULT_OK ? null : intent.getData();
               mUM.onReceiveValue(result);
               mUM = null;
           }
       }
    }
    
    /**
    * 选择照片后结束
    */
    private Uri afterChosePic(String oldPath, String newPath) {
       File newFile;
       try {
           newFile = FileUtils.compressFile(oldPath, newPath);
       } catch (Exception e) {
           e.printStackTrace();
           newFile = null;
       }
       return Uri.fromFile(newFile);
    }
    复制代码
  3. 工具类

    public class FileUtils {
        /**
         * 把图片压缩到200K
         *
         * @param oldpath
         *            压缩前的图片路径
         * @param newPath
         *            压缩后的图片路径
         * @return
         */
        public static File compressFile(String oldpath, String newPath) {
            Bitmap compressBitmap = FileUtils.decodeFile(oldpath);
            Bitmap newBitmap = ratingImage(oldpath, compressBitmap);
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            newBitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
            byte[] bytes = os.toByteArray();
    
            File file = null ;
            try {
                file = FileUtils.getFileFromBytes(bytes, newPath);
            } catch (Exception e) {
                e.printStackTrace();
            }finally{
                if(newBitmap != null ){
                    if(!newBitmap.isRecycled()){
                        newBitmap.recycle();
                    }
                    newBitmap  = null;
                }
                if(compressBitmap != null ){
                    if(!compressBitmap.isRecycled()){
                        compressBitmap.recycle();
                    }
                    compressBitmap  = null;
                }
            }
            return file;
        }
    
        private static Bitmap ratingImage(String filePath,Bitmap bitmap){
            int degree = readPictureDegree(filePath);
            return rotaingImageView(degree, bitmap);
        }
    
        /**
         *  旋转图片
         * @param angle
         * @param bitmap
         * @return Bitmap
         */
        public static Bitmap rotaingImageView(int angle , Bitmap bitmap) {
            //旋转图片 动作
            Matrix matrix = new Matrix();;
            matrix.postRotate(angle);
            System.out.println("angle2=" + angle);
            // 创建新的图片
            Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
                    bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            return resizedBitmap;
        }
    
        /**
         * 读取图片属性:旋转的角度
         * @param path 图片绝对路径
         * @return degree旋转的角度
         */
        public static int readPictureDegree(String path) {
            int degree  = 0;
            try {
                ExifInterface exifInterface = new ExifInterface(path);
                int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
                switch (orientation) {
                    case ExifInterface.ORIENTATION_ROTATE_90:
                        degree = 90;
                        break;
                    case ExifInterface.ORIENTATION_ROTATE_180:
                        degree = 180;
                        break;
                    case ExifInterface.ORIENTATION_ROTATE_270:
                        degree = 270;
                        break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            return degree;
        }
    
        /**
         * 把字节数组保存为一个文件
         *
         * @param b
         * @param outputFile
         * @return
         */
        public static File getFileFromBytes(byte[] b, String outputFile) {
            File ret = null;
            BufferedOutputStream stream = null;
            try {
                ret = new File(outputFile);
                FileOutputStream fstream = new FileOutputStream(ret);
                stream = new BufferedOutputStream(fstream);
                stream.write(b);
            } catch (Exception e) {
                // log.error("helper:get file from byte process error!");
                e.printStackTrace();
            } finally {
                if (stream != null) {
                    try {
                        stream.close();
                    } catch (IOException e) {
                        // log.error("helper:get file from byte process error!");
                        e.printStackTrace();
                    }
                }
            }
            return ret;
        }
    
        /**
         * 图片压缩
         *
         * @param fPath
         * @return
         */
        public static Bitmap decodeFile(String fPath) {
            BitmapFactory.Options opts = new BitmapFactory.Options();
            opts.inJustDecodeBounds = true;
            opts.inDither = false; // Disable Dithering mode
            opts.inPurgeable = true; // Tell to gc that whether it needs free
            opts.inInputShareable = true; // Which kind of reference will be used to
            BitmapFactory.decodeFile(fPath, opts);
            final int REQUIRED_SIZE = 400;
            int scale = 1;
            if (opts.outHeight > REQUIRED_SIZE || opts.outWidth > REQUIRED_SIZE) {
                final int heightRatio = Math.round((float) opts.outHeight
                        / (float) REQUIRED_SIZE);
                final int widthRatio = Math.round((float) opts.outWidth
                        / (float) REQUIRED_SIZE);
                scale = heightRatio < widthRatio ? heightRatio : widthRatio;//
            }
            Log.i("scale", "scal ="+ scale);
            opts.inJustDecodeBounds = false;
            opts.inSampleSize = scale;
            Bitmap bm = BitmapFactory.decodeFile(fPath, opts).copy(Bitmap.Config.ARGB_8888, false);
            return bm;
        }
    
    
    
        /**
         * 创建目录
         * @param path
         */
        public static void setMkdir(String path)
        {
            File file = new File(path);
            if(!file.exists())
            {
                file.mkdirs();
                Log.e("file", "目录不存在  创建目录    ");
            }else{
                Log.e("file", "目录存在");
            }
        }
    
        /**
         * 获取目录名称
         * @param url
         * @return FileName
         */
        public static String getFileName(String url)
        {
            int lastIndexStart = url.lastIndexOf("/");
            if(lastIndexStart!=-1)
            {
                return url.substring(lastIndexStart+1, url.length());
            }else{
                return null;
            }
        }
    
        /**
         * 删除该目录下的文件
         *
         * @param path
         */
        public static void delFile(String path) {
            if (!TextUtils.isEmpty(path)) {
                File file = new File(path);
                if (file.exists()) {
                    file.delete();
                }
            }
        }
    }
    复制代码
  4. 需要注意的问题

    1. 在打release包的时候,因为混淆的问题,点击又会没有反应,这是因为openFileChooser()是系统api,所以需要在混淆是不混淆该方法。

      -keepclassmembers class * extends android.webkit.WebChromeClient{
      public void openFileChooser(...);
      }
      复制代码
    2. 当点击拍照之后,如果相机是横屏拍照的话,当拍照结束之后跳回app的时候,会导致app端当前的webView页面销毁并重新打开,需要在androidManifest.xml中当前Activity添加:

      android:configChanges="orientation|keyboardHidden|screenSize"
      复制代码
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