MyAsyncTask task =new MyAsyncTask(); 報錯：沒有任何類型 ImageTest 的外層實例可訪問。必須用類型 ImageTest 的外層實例（例如，x.new A()，其中 x 是 ImageTest 的實例）來限定分配。?

和視頻的代碼好像一樣，請問為什么會報錯？

MainActivity.java的代碼：

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

MyAsyncTask task =new MyAsyncTask();

task.execute();

}

public void loadImage(View view) {

startActivity(new Intent(this, ImageTest.class));

}

}

ImageTest.java里的代碼：

public class ImageTest extends Activity{

private ImageView mImageView;

private ProgressBar mProgressBar;

private static String URL="http://www.bz55.com/uploads/allimg/150126/140-150126114I6.jpg";

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.image);

mImageView=(ImageView) findViewById(R.id.image);

mProgressBar=(ProgressBar) findViewById(R.id.progressbar);

//設置傳遞進去的參數

new MyAsyncTask().execute(URL);

}

class MyAsyncTask extends AsyncTask<String,Void,Bitmap>{

@Override

protected void onPreExecute() {

// TODO Auto-generated method stub

super.onPreExecute();

mProgressBar.setVisibility(View.VISIBLE);

}

@Override

protected void onPostExecute(Bitmap bitmap) {

// TODO Auto-generated method stub

super.onPostExecute(bitmap);

mProgressBar.setVisibility(View.GONE);

mImageView.setImageBitmap(bitmap);

}

@Override

protected Bitmap doInBackground(String... params) {

// TODO Auto-generated method stub

//獲取傳遞進來的參數

String url=params[0];

Bitmap bitmap=null;

URLConnection connection;

InputStream is;

try {

connection=new URL(url).openConnection();

is=connection.getInputStream();

BufferedInputStream bis=new BufferedInputStream(is);

//通過decodeStream解析輸入流

bitmap=BitmapFactory.decodeStream(bis);

is.close();

bis.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

//將Bitmap作為返回值

return bitmap;

}

}

}