Android中的处理程序逻辑

下面是我在处理程序中使用的代码，以创建单独的线程。我有一个存储所有方块的列表，我只希望显示10个（用于测试目的）使用.size（）来获取列表中的方块数。Android中的处理程序逻辑

这个想法是随机生成x和y值，然后.addSquare将它添加到列表中，但也画在我的画布上。

我的问题是，我将如何推迟每个单独的方形绘制的时间，以便所有10个不会同时出现？

编辑：由此，我的意思是，延迟显示每个人。

谢谢。

handler = new Handler(); 
    Runnable runnable = new Runnable() 
    { 
     @Override 
     public void run() { 
      while (sModel.getSquares().size() < 10) 
      { 
       int width = 980; 
       int height = 1280; 

       // create random 
       Random rand = new Random(); 

       // float values for storing random x, y coords 
       float randX, randY; 

       randX = rand.nextInt(width); // random x 
       randY = rand.nextInt(height); // random y 
       sModel.addSquare(randX, randY, Color.BLUE); 
       handler.postDelayed(this, 2000); 
      } 
     } 
    };handler.postDelayed(runnable,1000);

编辑： logcat中的要求：（错误从试图执行的wait（）和notify（））

01-15 07:22:47.811: W/asset(3951): Copying FileAsset 0x6a1eeb58 (zip:/data/app/ce0941a.coursework.Int.BoxesGame-1.apk:/resources.arsc) to buffer size 5184 to make it aligned. 
01-15 07:22:47.901: I/Adreno-EGL(3951): <qeglDrvAPI_eglInitialize:316>: EGL 1.4 QUALCOMM build: (CL3907963) 
01-15 07:22:47.901: I/Adreno-EGL(3951): OpenGL ES Shader Compiler Version: 17.01.09 
01-15 07:22:47.901: I/Adreno-EGL(3951): Build Date: 09/26/13 Thu 
01-15 07:22:47.901: I/Adreno-EGL(3951): Local Branch: 
01-15 07:22:47.901: I/Adreno-EGL(3951): Remote Branch: 
01-15 07:22:47.901: I/Adreno-EGL(3951): Local Patches: 
01-15 07:22:47.901: I/Adreno-EGL(3951): Reconstruct Branch: 
01-15 07:22:47.991: D/qdmemalloc(3951): ion: Mapped buf base:0x6c932000 size:8355840 offset:0 fd:54 
01-15 07:22:48.001: D/qdmemalloc(3951): ion: Mapped buf base:0x6c874000 size:4096 offset:0 fd:55 
01-15 07:22:52.526: D/qdmemalloc(3951): ion: Mapped buf base:0x6d26d000 size:8355840 offset:0 fd:57 
01-15 07:22:52.526: D/qdmemalloc(3951): ion: Mapped buf base:0x6c886000 size:4096 offset:0 fd:58 
01-15 07:22:52.636: D/qdmemalloc(3951): ion: Mapped buf base:0x6da65000 size:8355840 offset:0 fd:59 
01-15 07:22:52.636: D/qdmemalloc(3951): ion: Mapped buf base:0x6c887000 size:4096 offset:0 fd:60 
01-15 07:22:52.636: W/dalvikvm(3951): threadid=1: thread exiting with uncaught exception (group=0x415d4970) 
01-15 07:22:52.636: E/AndroidRuntime(3951): FATAL EXCEPTION: main 
01-15 07:22:52.636: E/AndroidRuntime(3951): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{ce0941a.coursework.Int.BoxesGame/ce0941a.coursework.controller.GameActivity}: java.lang.InstantiationException: can't instantiate class ce0941a.coursework.controller.GameActivity; no empty constructor 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2435) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2574) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.app.ActivityThread.access$600(ActivityThread.java:162) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1413) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.os.Handler.dispatchMessage(Handler.java:99) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.os.Looper.loop(Looper.java:158) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.app.ActivityThread.main(ActivityThread.java:5789) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at java.lang.reflect.Method.invoke(Method.java:525) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at dalvik.system.NativeStart.main(Native Method) 
01-15 07:22:52.636: E/AndroidRuntime(3951): Caused by: java.lang.InstantiationException: can't instantiate class ce0941a.coursework.controller.GameActivity; no empty constructor 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at java.lang.Class.newInstanceImpl(Native Method) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at java.lang.Class.newInstance(Class.java:1130) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.app.Instrumentation.newActivity(Instrumentation.java:1079) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2426) 
01-15 07:22:52.636: E/AndroidRuntime(3951):  ... 11 more 
01-15 07:22:59.263: D/Process(3951): killProcess, pid=3951 
01-15 07:22:59.263: D/Process(3951): com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException:123 java.lang.ThreadGroup.uncaughtException:693 java.lang.ThreadGroup.uncaughtException:690

来源

2014-01-15 RevXaisks

你可以在当前线程中调用wait并在10秒后调用notifyAll –

@Karan_Rana我对Android编程非常陌生，请你举个例子吗？谢谢。 – RevXaisks

http://www.journaldev.com/1037/java-thread-wait-notify-and-notifyall-example 此链接可能会清除您的主题概念 –

你已经实现了你的活动构造删除，并把它的代码在onCreate。

此错误与处理程序无关。

来源

2014-01-15 13:20:29

LogCat发布后，我试图从Karan_Rana的建议显示我的执行wait（）和notify（）以显示我的错误，当它没有工作。代码没有错误，它运行良好。我需要延迟处理程序中绘制正方形所需的时间。有什么建议吗？非常感谢。 – RevXaisks

当前代码发生了什么？ –

Android中的处理程序逻辑

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