Question

在我的应用中，我正在使用tabview。在其中一个选项卡中，我实现了刷新功能，例如：

private final Runnable r = new Runnable() {
    public void run() {
        mVar = true;
        while (mVar == true){
            calculateResult();
            //refresh();

            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }
    }
};
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    handler.removeCallbacks(r);
    setContentView(R.layout.result_view);
    refresh();
    setBackGround();
}
public void refresh() {
    new Thread(r).start();
    //handler.postDelayed(r, 1000);
}

我已经尝试使用handler.removeCallbacks(r);来阻止处理程序重复自我或我所相信的。但是当我启动它时系统崩溃了。

这是我的错误日志：

04-23 01:14:20.234: D/dalvikvm(14753): GC_EXTERNAL_ALLOC freed 53K, 47% free 2868K/5379K, external 0K/0K, paused 37ms
04-23 01:14:20.265: D/ATRecorder(14753): com.htc.autotest.dlib.RecordEngine in loader dalvik.system.DexClassLoader@405178e8
04-23 01:14:20.275: D/WindowManagerImpl(14753): addView, new view, mViews[0]: com.android.internal.policy.impl.PhoneWindow$DecorView@40523840
04-23 01:14:23.368: D/dalvikvm(14753): GC_EXTERNAL_ALLOC freed 17K, 47% free 2901K/5379K, external 1151K/1663K, paused 23ms
04-23 01:14:23.518: D/dalvikvm(14753): GC_EXTERNAL_ALLOC freed 86K, 45% free 2960K/5379K, external 2320K/2875K, paused 24ms
04-23 01:14:23.678: D/dalvikvm(14753): GC_EXTERNAL_ALLOC freed 3K, 45% free 2961K/5379K, external 8073K/10082K, paused 25ms
04-23 01:14:23.798: D/ATRecorder(14753): com.htc.autotest.dlib.RecordEngine in loader dalvik.system.DexClassLoader@4053b728
04-23 01:14:23.878: D/dalvikvm(14753): GC_EXTERNAL_ALLOC freed 10K, 45% free 2969K/5379K, external 13845K/15875K, paused 28ms
04-23 01:14:23.898: D/ATRecorder(14753): com.htc.autotest.dlib.RecordEngine in loader dalvik.system.DexClassLoader@40531240
04-23 01:14:23.908: D/WindowManagerImpl(14753): addView, new view, mViews[1]: com.android.internal.policy.impl.PhoneWindow$DecorView@40512848
04-23 01:14:24.108: W/dalvikvm(14753): threadid=10: thread exiting with uncaught exception (group=0x4001d5a0)
04-23 01:14:24.108: E/AndroidRuntime(14753): FATAL EXCEPTION: Thread-11
04-23 01:14:24.108: E/AndroidRuntime(14753): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.ViewRoot.checkThread(ViewRoot.java:3165)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.ViewRoot.requestLayout(ViewRoot.java:677)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.view.View.requestLayout(View.java:8507)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.widget.ImageView.setImageDrawable(ImageView.java:330)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at android.widget.ImageView.setImageBitmap(ImageView.java:344)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at com.FYP.indoorGPS.TouchImageView.setImageBitmap(TouchImageView.java:153)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at com.FYP.indoorGPS.MapActivity.drawMap(MapActivity.java:163)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at com.FYP.indoorGPS.MapActivity$1.run(MapActivity.java:31)
04-23 01:14:24.108: E/AndroidRuntime(14753):    at java.lang.Thread.run(Thread.java:1027)
04-23 01:14:24.379: D/WindowManagerImpl(14753): finishRemoveViewLocked, mViews[0]: com.android.internal.policy.impl.PhoneWindow$DecorView@40523840
04-23 01:14:24.419: D/WindowManagerImpl(14753): finishRemoveViewLocked, mViews[0]: com.android.internal.policy.impl.PhoneWindow$DecorView@40512848
04-23 01:14:26.030: D/Process(14753): killProcess, pid=14753

谁能告诉我该怎么办？

Answer 1

我猜测问题是你的Runnable“r”在removeCallbacks()之后仍在运行。 removeCallbacks()不会阻止正在运行的Runnable，它只是让它无法启动。

此外，您的refresh()再次调用“r”，因此将无限期地调用它。因此，如果在“r”运行时调用removeCallbacks()，则没有代码可以停止“r”，它将永远循环。

解决方案是在Runnable中有一个循环，并在每个循环结束时调用Thread.sleep()。然后简单地结束循环以停止Runnable。

例如，在你的Runnable中：

public void run() {
    mVar = true;
    while (mVar == true){
        //do stuff
        Thread.sleep(2000);
    }

}

让mVar成为静态变量，您可以将其设置为false以结束循环。

另外，我建议不要在UI线程上运行此Runnable，因为它可能会导致您的应用在Thread.sleep(2000)方法期间停止响应。您可以使用以下内容：

new Thread(r).start();

编辑：如果您要在Runnable中处理视图，那么处理视图的代码必须从UI线程运行。因此，需要通过处理程序调用从runnable更改视图的任何代码。

Answer 2

我认为使用Handler是更好的解决方案，而不是Thread。看下面的代码，它应该工作。我假设mVar是一个受控变量，它将被设置为false以停止处理程序。

private final Runnable r = new Runnable() {
    public void run() {
        if (mVar) {
            calculateResult();
            handler.postDelayed(this, 2000);
        }
    }
};

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    handler.removeCallbacks(r);
    setContentView(R.layout.result_view);
    refresh();
    setBackGround();
}

public void refresh() {
    handler.postDelayed(r, 1000);
}

移动到tabview中的另一个选项卡时停止handler.postDelayed

2 个答案: