[英]Worker thread in Android
您好我試圖模擬Android中的工作線程進行測試。 該活動有一個按鈕,通過工作線程調用notify(),我希望它在bucle的10次迭代后進入休眠狀態。
這是我的代碼和錯誤的堆棧跟蹤。 我該如何解決? 謝謝
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
t= new Thread(){
public void run(){
int i=0;
while(true){
if (i%10==9){
//Simulated end of data until notified again
try {
this.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
Log.d("Test",""+i);
SystemClock.sleep(1000);
}
}
};
t.start();
findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
t.notify();
}
});
}
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): FATAL EXCEPTION: main
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): java.lang.IllegalMonitorStateException: object not locked by thread before notify()
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at java.lang.Object.notify(Native Method)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at com.example.memorycrash.MemoryCrashTestActivity$2.onClick(MemoryCrashTestActivity.java:51)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at android.view.View.performClick(View.java:2538)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at android.view.View$PerformClick.run(View.java:9152)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at android.os.Handler.handleCallback(Handler.java:587)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at android.os.Handler.dispatchMessage(Handler.java:92)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at android.os.Looper.loop(Looper.java:130)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at android.app.ActivityThread.main(ActivityThread.java:3687)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at java.lang.reflect.Method.invokeNative(Native Method)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at java.lang.reflect.Method.invoke(Method.java:507)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
08-06 05:39:45.320: ERROR/AndroidRuntime(4480): at dalvik.system.NativeStart.main(Native Method)
所以這是你的解決方案。 StackOverflow已經有了答案。
為了在對象上調用wait(),notify()或notifyAll(),你必須首先擁有你想要調用方法的對象的監視器,所以在你運行的情況下,這就是你需要的方式去做吧:
Runnable runnable = new Runnable() {
public void run() {
// wait(); This call wouldn't work
syncronized (this) {
wait(); // This call will work
}
}
};
要通知該runnable,您還必須擁有該監視器
// runnable.notifyAll(); this call will not work
syncronized (runnable) {
runnable.notifyAll(); // this call will work
}
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