Android实现图片上传蒙层进度条

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <!--大小-->
    <size android:height="82dp" android:width="82dp"/>
    <!--<solid android:color="#3f000000" />-->
    <solid android:color="#ffff4444"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<clip xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/bg_feedback_mask"
    android:clipOrientation="vertical"
    android:gravity="top"/>

<ImageView
  android:id="@+id/thumbnail"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:scaleType="fitXY" />

<ImageView
  android:id="@+id/picture_upload_progress"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:src="@drawable/bg_feedback_clip"
  android:visibility="gone" />

private class UploadPictureTask extends AsyncTask<String, Integer, UploadPictureResult> {
 
        private String filePath;
        private CountingTypedFile.ProgressListener listener;
 
        public UploadPictureTask(String filePath) {
            this.filePath = filePath;
        }
 
        @Override
        protected void onPreExecute() {
 
            uploadProgressImageView.setVisibility(View.VISIBLE);
            uploadProgressImageView.getDrawable().setLevel(MAX_LEVEL);
            super.onPreExecute();
        }
 
        @Override
        protected UploadPictureResult doInBackground(String... params) {
 
            File file = new File(filePath);
            fileSize = file.length();
            listener = new CountingTypedFile.ProgressListener() {
                @Override
                public void transferred(long num) {
                    publishProgress((int) ((num / (float) fileSize) * NUM_100));
                }
            };
            UploadPictureResult uploadPictureResult = uploadImage(id, new CountingTypedFile("multipart/form-data", file, listener)
            return uploadPictureResult;
        }
 
 
        @Override
        protected void onProgressUpdate(Integer... values) {
            //蒙层进度条
            (uploadProgressImageView.getDrawable()).setLevel(MAX_LEVEL - values[0] * NUM_100);
        }
 
        @Override
        protected void onPostExecute(UploadPictureResult uploadImageResult) {
            findViewById(R.id.send_feedback).setVisibility(View.VISIBLE);
            if (exception != null || uploadImageResult == null) {
                Toast.makeText(FeedbackActivity.this, "上传失败", Toast.LENGTH_SHORT).show();
                return;
            }
            Toast.makeText(FeedbackActivity.this, "上传成功", Toast.LENGTH_SHORT).show();
            pictureUrl = uploadImageResult.getUrl();
            super.onPostExecute(uploadImageResult);
        }
    }

public class CountingTypedFile extends TypedFile {
 
    private static final int BUFFER_SIZE = 4096;
 
    private final ProgressListener listener;
 
    /**
     * Constructs a new typed file.
     *
     * @param mimeType
     * @param file
     * @throws NullPointerException if file or mimeType is null
     */
    public CountingTypedFile(String mimeType, File file, ProgressListener listener) {
        super(mimeType, file);
        this.listener = listener;
    }
 
    @Override
    public void writeTo(OutputStream out) throws IOException {
        byte[] buffer = new byte[BUFFER_SIZE];
        FileInputStream in = new FileInputStream(super.file());
        long total = 0;
        try {
            int length;
            while ((length = in.read(buffer)) != -1) {
                total += length;
                this.listener.transferred(total);
                out.write(buffer, 0, length);
            }
        } finally {
            in.close();
        }
    }
    public interface ProgressListener {
        void transferred(long num);
    }
}