Android控制SurfaceView的位置由WindowsManager.LayoutParams

Question

如何控制窗口的位置？

我將SurfaceView加上WindowManager.LayoutParam加入WindowManager; 我試圖改變Thread中的x和y的WindowManager.LayoutParams; 但我只收到了錯誤Thread Exception。

SurfaceViewDemoActivity的.java

public class SurfaceViewDemoActivity extends Activity { 
    private MySurfaceView mySurfaceView; 
    private FloatingWindow floatingWindow; 
    private int x = 0; 
    private Thread t; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState);   
     int imgId = R.drawable.bubble; 
     mySurfaceView = new MySurfaceView(this, imgId); 
     floatingWindow = new FloatingWindow(this, mySurfaceView, 0, 0);   

     t = new Thread(new Runnable(){ 
       public void run() { 
        while (true) { 
         if (x > 150) x = 0; 
         //The problem is here. 
         floatingWindow.update(mySurfaceView, x, x); 
         x++; 
        } 
       } 
     });  
     t.start(); 
    } 
} 

FloatingWindow的.java

public class FloatingWindow { 
    private WindowManager windowManager; 
    private WindowManager.LayoutParams layoutParams; 
    private boolean hasViewAdded = false; 

    public final void update (View view, int coordX, int coordY) { 
     update(coordX, coordY); 
     update(view); 
    }  

    public final void update (View view) { 
     if (isViewAdded() == true) { 
      windowManager.updateViewLayout(view, layoutParams); 
     } else {  
      windowManager.addView(view, layoutParams); 
      setViewAdded(true); 
     } 
    } 

    private final void update (int coordX, int coordY) { 
     this.layoutParams.gravity = Gravity.LEFT | Gravity.TOP; 
     this.layoutParams.x = coordX; 
     this.layoutParams.y = coordY;  
    } 

    private void updateSize (View view) { 
     int width = view.getWidth(); 
     int height = view.getHeight(); 
     this.layoutParams.width = width; 
     this.layoutParams.height = height; 
    } 

    public FloatingWindow (Context context, View view, int coordX, int coordY) { 
     init(context); 
     updateSize(view); 
     update(view, coordX, coordY); 
    } 

    private void init(Context context) { 
     this.windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); 
     this.layoutParams = new WindowManager.LayoutParams(); 
     this.layoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; 
     this.layoutParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE; 
     this.layoutParams.format = PixelFormat.TRANSPARENT; 
    } 

    protected boolean isViewAdded() { 
     return this.hasViewAdded; 
    } 

    protected void setViewAdded (boolean hasViewAdded) { 
     this.hasViewAdded = hasViewAdded; 
    } 
} 

的AndroidManifest.xml

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/> 

log.txt的

E/Trace(5041):  error opening trace file: No such file or directory (2) 
W/Trace(5041):  Unexpected value from nativeGetEnabledTags: 0 

I/Choreographer(5041): Skipped 128 frames! The application may be doing too much work on its main thread. 

W/Trace(5041):  Unexpected value from nativeGetEnabledTags: 0 
W/dalvikvm(5041): threadid=11: thread exiting with uncaught exception (group=0xb5cff908) 

E/AndroidRuntime(5041): FATAL EXCEPTION: Thread-252 
E/AndroidRuntime(5041): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 

E/AndroidRuntime(5041):  at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4746) 
E/AndroidRuntime(5041):  at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:823) 

E/AndroidRuntime(5041):  at android.view.View.requestLayout(View.java:15468) 
E/AndroidRuntime(5041):  at android.view.View.setLayoutParams(View.java:10022) 
E/AndroidRuntime(5041):  at android.view.WindowManagerGlobal.updateViewLayout(WindowManagerGlobal.java:269) 

E/AndroidRuntime(5041):  at android.view.WindowManagerImpl.updateViewLayout(WindowManagerImpl.java:74) 
E/AndroidRuntime(5041):  at com.givemepass.surfaceview.FloatingWindow.update(FloatingWindow.java:27) 
E/AndroidRuntime(5041):  at com.givemepass.surfaceview.FloatingWindow.update(FloatingWindow.java:18) 

E/AndroidRuntime(5041):  at com.givemepass.surfaceview.SurfaceViewDemoActivity$1.run(SurfaceViewDemoActivity.java:33) 
E/AndroidRuntime(5041):  at java.lang.Thread.run(Thread.java:856) 

W/Trace(5041):  Unexpected value from nativeGetEnabledTags: 0 
D/gralloc_goldfish(5041): Emulator without GPU emulation detected. 
W/Trace(5041):  Unexpected value from nativeGetEnabledTags: 0 

I/Choreographer(5041): Skipped 671 frames! The application may be doing too much work on its main thread. 
W/Trace(5041):  Unexpected value from nativeGetEnabledTags: 0 

W/Trace(5041):  Unexpected value from nativeGetEnabledTags: 0 
A/libc(5041):  Fatal signal 11 (SIGSEGV) at 0xae3e1000 (code=1), thread 5057 (Thread-253) 
I/Process(5041): Sending signal. PID: 5041 SIG: 9 

Answer 1

後添加的 'SurfaceView' 到 '窗口管理器'， 只是改變 'x' 和WindowManager.LayoutParams的 'Y'。如果你有'線程異常'和消息（'只有創建視圖層次結構的原始線程可以觸及其視圖'），像我一樣，你可以在'Android Developers Blog'上閱讀Painless threading。

Thread t = new Thread(new Runnable(){ 
     public void run() { 
      while (true) { 
       if (x > 150) x = 0; 
       runOnUiThread(new Runnable() { 
        public void run() { 
         //Update the UI here. 
         floatingWindow.update(mySurfaceView, x, x); 
        } 
       }); 
       x++; 
      } 
     } 
    }); 

Answer 2

你必須使用Activity.runOnUiThread（Runnable的動作） 或在UI線程創建處理程序，並通過消息傳遞的是座標。 在Android中，GUI框架不是線程安全的。 因此，如果有人試圖從另一個線程使用UI，android的開發人員決定通知所有人有關錯誤。