我在显示progress dialog
AsyncTask
时遇到问题:
Activity has leaked window com.android.internal.policy.PhoneWindow$DecorView{8cee959 V.E...... R......D 0,0-1026,252} that was originally added here
这是我的异步任务:
public class MyClientTask extends AsyncTask<Void, Void, Void> {
private ProgressDialog progressDialog = null;
private Context mContext;
MyClientTask(Context mContext) {
this.mContext = mContext;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(mContext);
progressDialog.setMessage("Working ...");
progressDialog.setIndeterminate(false);
progressDialog.setCancelable(false);
progressDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
try {
wait(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (progressDialog != null) {
progressDialog.dismiss();
progressDialog = null;
}
}
}
这是我的活动:
public class ConnectionActivity extends Activity {
final private Context mContext = this;
private Button buttonConnect;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R .layout.activity_socketconnection);
buttonConnect = (Button) findViewById(R.id.buttonConnect);
buttonConnect.setOnClickListener(getConnectOncOnClickListener());
}
private OnClickListener getConnectOncOnClickListener() {
return new OnClickListener() {
@Override
public void onClick(View v) {
MyClientTask myClientTask = new MyClientTask(mContext);
try {
myClientTask.execute();
myClientTask.get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
};
}
}
我搜索了解决方案,但无论如何都无法正常工作
答案 0 :(得分:2)
一些提示:
在活动中保留对ProgressDialog
的引用,并添加公开方法以显示/隐藏它;
在WeakReference<Context>
中使用AsyncTask
让垃圾收集者完成工作;
摆脱阻止UI线程的myClientTask.get()
。
答案 1 :(得分:1)
这通常发生在您完成活动而不调用dismiss()或首先隐藏对话框时。我建议你稍微修改你的代码,在Activity中创建实际的ProgressDialog,然后存储对它的引用。在你的onDestroy()中,作为预防措施检查它是否为空并显示,然后解除()它。
答案 2 :(得分:0)
问题是在后台调用wait()。请看一下here。
样品:
private Object lock = new Object();
@Override
protected Void doInBackground(Void... arg0) {
synchronized(lock) {
try {
lock.wait(5000);
// Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return null;
}
答案 3 :(得分:0)
使用progressDialog.cancel();而不是progressDialog.dismiss();
你可以在这里发现差异:
What is the difference between a dialog being dismissed or canceled in Android?