为什么出错了，大神帮帮我看下代码哪错了
public class ImageTest extends Activity{
private ImageView mImageView;
private ProgressBar mProgressBar;
private static String URL="http://img.my.csdn.net/uploads/201504/12/1428806103_9476.png";
@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);
new MyAsyncTask().execute(URL);
}
class MyAsyncTask extends AsyncTask<String, Void, Bitmap>{
@Override
protected void onPreExecute() {
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) {
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);
Thread.sleep(3000);
bitmap=BitmapFactory.decodeStream(bis);
is.close();
bis.close();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return bitmap;
}
}
}
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();
}
@SuppressWarnings("unused")
private void loadImage(View view){
startActivity(new Intent(this,ImageTest.class));
}
}
public class MyAsyncTask extends AsyncTask<Void, Void, Void>{
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
Log.d("xys", "doInBackground");
publishProgress();
return null;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
Log.d("xys", "onPreExecute");
}
@Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
Log.d("xys", "onPostExecute");
}
@Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
Log.d("xys", "onProgressUpdate");
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp">
<ImageView
android:id="@+id/image"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<ProgressBar
android:id="@+id/progressbar"
android:visibility="gone"
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</RelativeLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.dan55.MainActivity" >
<Button
android:onClick="loadImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Image Test" />
</LinearLayout>
