我花了最后几个小时在这里寻找答案,但似乎没有什么对我来说清楚.
这是我的问题:我有一个带有主菜单的简单应用.其中一个选项可从PHP服务器检索注释列表,更新数据库,然后显示ListView.
内部一切正常.现在,每次我按回来然后再次启动活动时,都会启动一个新线程.我设法达到了50个以上的等待线程.我正在使用Eclipse的DDMS标签来监视胎面.
如果我尝试调用Looper.getLooper().quit()或Looper.myLooper().quit(),则会收到错误消息,提示“不允许退出主线程”.
我在做什么错,应该在哪里/如何停止线程?
这是代码:
public class RequestActivity extends Activity {
ProgressDialog pDialog;
DatabaseHelper db;
int userId;
myCursorAdapter adapter;
Thread runner = null;
ListView list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
userId = myApplication.getInstance().getSession().getUserId();
setContentView(R.layout.request_list);
db = new myProvider.DatabaseHelper(this);
Cursor cursor = db.getRequests(userId);
startManagingCursor(cursor);
adapter = new myCursorAdapter(RequestActivity.this, cursor);
list = (ListView) findViewById(R.id.list);
list.setVisibility(View.INVISIBLE);
list.setAdapter(adapter);
pDialog = ProgressDialog.show(RequestActivity.this, "", "Loading ...", true, false);
runner = new Thread() {
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
adapter.getCursor().requery();
}
};
public void run() {
Looper.prepare();
// ... setup HttpGet
try {
// ... get HTTP GET response
if (response != null) {
// ... update database
handler.sendEmptyMessage(0);
}
} catch(Exception e) {
// .. log exception
}
Looper.loop();
}
};
runner.start();
}
private static class ViewHolder {
// .. view objects
}
private class myCursorAdapter extends CursorAdapter {
private LayoutInflater inflater;
public myCursorAdapter(Context context, Cursor c) {
super(context, c);
inflater = LayoutInflater.from(context);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
// .. bind data
if (cursor.isLast()) {
pDialog.dismiss();
list.setVisibility(View.VISIBLE);
}
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View view = inflater.inflate(R.layout.request_list_item, parent, false);
ViewHolder holder = new ViewHolder();
// .. set holder View objects
view.setTag(holder);
return view;
}
}
}
解决方法:
在onDestroy方法上,您是否进行了任何调用来停止线程?
public void onDestroy()
{
Thread moribund = runner;
runner = null
moribund.interrupt();
}
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