AsyncTask异步任务 android

 自己写着玩的，如有错误欢迎大家指出。

布局文件

  <ImageView        android:id="@+id/image_view"        android:layout_width="match_parent"        android:layout_height="match_parent" />    <TextView        android:id="@+id/text_tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />Activity代码
public class MainActivity extends AppCompatActivity implements Into{      PRivate MyAsyncTask myAsyncTask;    private ImageView imageView;    private TextView textTv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                imageView = (ImageView) findViewById(R.id.image_view);        textTv = (TextView) findViewById(R.id.text_tv);        myAsyncTask = new MyAsyncTask(this);        myAsyncTask.execute();    }    @Override    public void setUpBitmap(Bitmap bitmap) {        imageView.setImageBitmap(bitmap);    }    @Override    public void setUpText(String string) {        textTv.setText(string);    }}异步任务中代码
ublic class MyAsyncTask extends AsyncTask<String,Integer,Bitmap> {    private Bitmap bitmap;    private Into into;    public MyAsyncTask(Into into) {        this.into = into;    }    @Override    protected Bitmap doInBackground(String... params) {        try {            URL url = new URL("http://img2.7624.net/uploads/20170207/20170207085020259.png");            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            if (connection.getResponseCode()==200){                InputStream inputStream = connection.getInputStream();                bitmap = BitmapFactory.decodeStream(inputStream);                inputStream.close();                for (int i = 5; i > 0; i--) {                    Thread.sleep(1000);                    publishProgress(i);                }            }        } catch (MalformedURLException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        } catch (InterruptedException e) {            e.printStackTrace();        }        return bitmap;    }    @Override    protected void onPostExecute(Bitmap bitmap) {        super.onPostExecute(bitmap);    }    @Override    protected void onProgressUpdate(Integer... values) {        super.onProgressUpdate(values);         into.setUpBitmap(bitmap);            into.setUpText(String.valueOf(values[0]));    }    @Override    protected void onPreExecute() {        super.onPreExecute();    }}Into接口中代码
public interface Into {    void setUpBitmap(Bitmap bitmap);    void setUpText(String string);}