问题描述
我希望你能帮助我：
我需要更新我的用户界面Android应用程序，我想使用handler类来做到这一点，使用的和Android开发人员资源共同任务使用的处理程序指南。
I need to update my ui for an android app and I'm trying to use the Handler class to do it, using http://developer.android.com/resources/articles/timed-ui-updates.html and the android developer resources "Common Task" for using Handlers as guides.
基本上，我需要在两者之间的东西 - 用户界面的一个定时更新，但没有一个按钮。因此，这里是相应和code是我的工作。所有的帮助是极大的AP preciated。
Basically, I need something between the two - a timed update of the user interface, but without a button. So here is the relevent code that I am working on. All help is greatly appreciated.
public class Activity1 extends Activity {
[...变量]
[… variables]
最后的处理程序mHandler =新的处理程序（）;
final Handler mHandler = new Handler();
final Runnable mUpdateResults = new Runnable() {
public void run() {
UpdateDisplay();
mHandler.postDelayed(mUpdateResults, 200);
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
[...]
[…]
startLongRunningOperation（）;
startLongRunningOperation();
}
protected void startLongRunningOperation() {
Thread t = new Thread() {
public void run() {
if (mStartTime == 0L) {
mStartTime = System.currentTimeMillis();
mHandler.postDelayed(mUpdateResults, 200);}
mHandler.post(mUpdateResults);
}
};
t.start();
}
再次感谢！
推荐答案
在Android上最好用的在后台执行任务，而（逐步）更新的用户界面从这项任务的结果。
On Android it's best to use AsyncTask to execute tasks in the background while (progressively) updating UI with results from this task.
编辑：
检查code后，我觉得你的处理程序正常工作。也许问题出在 UpdateDisplay（）。既然你要更新从后台线程的显示，确保你调用 [view.postInvalidate（）] [2] 大功告成更新查看后。
After checking code I think your Handler works correctly. Probably problem is in UpdateDisplay(). Since you are updating display from background thread, make sure you call [view.postInvalidate()][2] after you're done updating your View.
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