请我有一个包含异步任务方法的 Activity ,即使用户从该页面移动,此异步任务方法也会继续在后台执行。请问有没有办法在用户按下后退按钮或从该页面移动到另一个页面时立即停止异步任务执行。
以下是我尝试过的,但它不起作用
private AsyncTask totalLikesAsync;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity);
context = this;
totalLikesAsync = new TotalLikes().execute(msgID);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case android.R.id.home:
totalLikesAsync.cancel(true);
this.finish();
break;
case R.id.share:
new ShareImage().execute(msgImage);
default:
return super.onOptionsItemSelected(menuItem);
}
return true;
}
private class TotalLikes extends AsyncTask<String, String, JSONObject> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected JSONObject doInBackground(String... msgIDs) {
UserFunctions userFunction = new UserFunctions();
String msgsID = msgIDs[0];
JSONObject json=null;
if(!isCancelled()){
//This gets all the information unread from the server
json = userFunction.TotalLikes(context, msgsID);
}
return json;
}
@Override
protected void onPostExecute(JSONObject json) {
/**
* Checks for success message.
**/
if (json != null) {
...
} else {
...
}
}
}
更新
在测试了以下所有答案后,它们都允许在异步任务中执行 doinbackground ,即使按下后退按钮也是如此。我想要一种情况,即一旦按下后退按钮,背景就会被取消。
Best Answer-推荐答案 strong>
@Override
public void onBackPressed() {
super.onBackPressed();
if (totalLikesAsync != null && totalLikesAsync.getStatus().equals(AsyncTask.Status.RUNNING)) {
totalLikesAsync.cancel(true);
}
}
关于android - 按下后退按钮时如何停止异步任务执行,我们在Stack Overflow上找到一个类似的问题:
https://stackoverflow.com/questions/33935432/
|