我有一个 Chronometer,但是当我改变我的视图(使用 ActionBar)时它会停止。
我不是很了解如何使用 AsyncTask,也没有找到教程。
有什么容易解决我的问题吗?我真的很想举一个Chronometer的例子......
非常感谢!
到目前为止的代码:
public class BFragment extends SherlockFragment {
private Button start;
private View v;
private Chronometer chrono;
private Button pause;
private Button reset;
private long lastPause;
private Button resume;
private Boolean richtig;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
v = inflater.inflate(R.layout.activity_bfragment, container, false);
start = (Button) v.findViewById(R.id.start);
chrono = (Chronometer) v.findViewById(R.id.chronometer1);
pause = (Button) v.findViewById(R.id.pause);
reset = (Button) v.findViewById(R.id.reset);
resume = (Button) v.findViewById(R.id.resume);
richtig = true;
new chronom().execute();
return v;
}
private class chronom extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
start.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
chrono.setBase(SystemClock.elapsedRealtime());
chrono.start();
System.out.println(SystemClock.elapsedRealtime());
richtig = false;
}
});
pause.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
lastPause = SystemClock.elapsedRealtime();
chrono.stop();
richtig = true;
}
});
resume.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
if (richtig) {
chrono.setBase(chrono.getBase() + SystemClock.elapsedRealtime() - lastPause);
chrono.start();
} else {
}
}
});
reset.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
chrono.setBase(SystemClock.elapsedRealtime());
System.out.println(chrono.getBase());
richtig = false;
}
});
return null;
}
protected void onProgressUpdate(Integer... progress) {
}
protected void onPostExecute(Long result) {
}
}
}
我刚刚复制了代码......(Chrono 工作,但不在后台)