Android: Crash: línea de archivo XML binario: error al inflar la clase (con SurfaceView)

Question

Tengo SurfaceView de Android y estoy tratando de agregar botones a esto. En el lienzo de vista de superficie dibujo algo. Y tengo una clase de subprocesos para seguir dibujando.

package com.androidsurfaceview; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 

public class androidsurfaceview extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     Button buttonShowHide = (Button)findViewById(R.id.showhide); 
     final Button buttonDummy = (Button)findViewById(R.id.dummy); 

     buttonShowHide.setOnClickListener(
       new Button.OnClickListener(){ 

        @Override 
        public void onClick(View arg0) { 
         // TODO Auto-generated method stub 
         if(buttonDummy.getVisibility()==View.VISIBLE){ 
          buttonDummy.setVisibility(View.GONE); 
         } 
         else{ 
          buttonDummy.setVisibility(View.VISIBLE); 
         } 
        } 

       } 
     ); 

La clase hilo

package com.androidsurfaceview; 

import android.graphics.Canvas; 
import android.view.SurfaceHolder; 
public class MySurfaceThread extends Thread { 
    private SurfaceHolder myThreadSurfaceHolder; 
    private com.androidsurfaceview.test.MySurfaceView myThreadSurfaceView; 
    private boolean myThreadRun = false; 

    public MySurfaceThread(SurfaceHolder surfaceHolder, com.androidsurfaceview.test.MySurfaceView surfaceView) { 
     myThreadSurfaceHolder = surfaceHolder; 
     myThreadSurfaceView = surfaceView; 
    } 

    public void setRunning(boolean b) { 
     myThreadRun = b; 
    } 

    @Override 
    public void run() { 
     // TODO Auto-generated method stub 
     while(myThreadRun){ 
      Canvas c = null; 

      try{ 
       c = myThreadSurfaceHolder.lockCanvas(null); 
       synchronized (myThreadSurfaceHolder){ 
        myThreadSurfaceView.onDraw(c); 
       } 
       sleep(100); 
      } catch (InterruptedException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 
      finally{ 
       // do this in a finally so that if an exception is thrown 
       // during the above, we don't leave the Surface in an 
       // inconsistent state 
       if (c != null) { 
        myThreadSurfaceHolder.unlockCanvasAndPost(c); 
       } 
      } 
     } 
    } 
} 

El SurfaceView & la clase para la elaboración

package com.androidsurfaceview; 

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.util.AttributeSet; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 

public class test extends Activity{ 

     //  ...... 
     // I do a few things here... with this class test. 

    public class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback{ 

     private MySurfaceThread thread; 
     private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
     int cx, cy, offx, offy; 

     public MySurfaceView(Context context) { 
      super(context); 
      // TODO Auto-generated constructor stub 
      init(); 
     } 

     public MySurfaceView(Context context, AttributeSet attrs) { 
      super(context, attrs); 
      // TODO Auto-generated constructor stub 
      init(); 
     } 

     public MySurfaceView(Context context, AttributeSet attrs, int defStyle) { 
      super(context, attrs, defStyle); 
      // TODO Auto-generated constructor stub 
      init(); 
     } 

     private void init(){ 
       getHolder().addCallback(this); 
       thread = new MySurfaceThread(getHolder(), this); 

       setFocusable(true); // make sure we get key events 

       paint.setStyle(Paint.Style.STROKE); 
       paint.setStrokeWidth(3); 
       paint.setColor(Color.WHITE); 

       cx = 0; 
       cy = 0; 
       offx = 10; 
       offy = 10; 

      } 

     @Override 
     public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { 
      // TODO Auto-generated method stub 

     } 

     @Override 
     public void surfaceCreated(SurfaceHolder holder) { 
      // TODO Auto-generated method stub 
      thread.setRunning(true); 
      thread.start(); 

     } 

     @Override 
     public void surfaceDestroyed(SurfaceHolder holder) { 
      // TODO Auto-generated method stub 
      boolean retry = true; 
      thread.setRunning(false); 
      while (retry) { 
       try { 
        thread.join(); 
        retry = false; 
       } 
       catch (InterruptedException e) { 
       } 
      } 
     } 
    ////Just a simple graphic of moving circle. 
     @Override 
     protected void onDraw(Canvas canvas) { 
      // TODO Auto-generated method stub 
      canvas.drawRGB(0, 0, 0); 
      canvas.drawCircle(cx, cy, 3, paint); 
      cx += offx; 
      if (cx > getWidth() || (cx < 0)){ 
       offx *= -1; 
       cx += offx; 
      } 

      cy += offy; 
      if (cy > getHeight() || (cy < 0)){ 
       offy *= -1; 
       cy += offy; 
      } 
     } 
    } 
    } 

Aquí es el main.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
<Button 
    android:id="@+id/showhide" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Toggle The Another Button Show/Hide" /> 
<Button 
    android:id="@+id/dummy" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="a Button" /> 
<FrameLayout 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 

<com.androidsurfaceview.test.MySurfaceView 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"/> 

</FrameLayout> 
</LinearLayout> 

PROBLEMA: El código anterior funciona SOLAMENTE si no tengo el "MySurfaceView" como clase anidada. pero con la clase "prueba" aparece el siguiente error. Si elimino el "prueba de clase" , funciona bien.

error/Crash

04-29 11:43:18.977: ERROR/AndroidRuntime(21832): FATAL EXCEPTION: main 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidsurfaceview/com.androidsurfaceview.androidsurfaceview}: **android.view.InflateException: Binary XML file line #20: Error inflating class com.androidsurfaceview.test.MySurfaceView** 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.ActivityThread.access$2300(ActivityThread.java:125) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.os.Handler.dispatchMessage(Handler.java:99) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.os.Looper.loop(Looper.java:123) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at java.lang.reflect.Method.invokeNative(Native Method) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at java.lang.reflect.Method.invoke(Method.java:521) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at dalvik.system.NativeStart.main(Native Method) 
**04-29 11:43:18.977: ERROR/AndroidRuntime(21832): Caused by: android.view.InflateException: Binary XML file line #20: Error inflating class com.androidsurfaceview.test.MySurfaceView** 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:576) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:618) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:621) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.view.LayoutInflater.inflate(LayoutInflater.java:407) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:200) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.Activity.setContentView(Activity.java:1647) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at com.androidsurfaceview.androidsurfaceview.onCreate(androidsurfaceview.java:13) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
04-29 11:43:18.977: ERROR/AndroidRuntime(21832):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 

Cualquier ayuda será muy bueno ... estoy atascado con esto.

Answer 1

En primer lugar, debe declarar su punto de vista como un tipo static, para poder ser inflado incluso cuando no hay instancia de la clase de retención está disponible:

public static class MySurfaceView extends SurfaceView 
    implements SurfaceHolder.Callback 

La línea

<com.androidsurfaceview.test.MySurfaceView 

en su diseño, xml sugiere que la clase MySurfaceView está dentro del paquete com.androidsurfaceview.test e intenta inflarla desde allí, lo cual es incorrecto.

En su diseño debe seguir el package.class $ innerclass forma de declaración.

PERO ya que el "$" es de carácter ilegal, no se puede escribir

<com.androidsurfaceview.test$MySurfaceView 

lo que debe especificar su punto de vista en el xml diseño de la siguiente manera:

<view class="com.androidsurfaceview.test$MySurfaceView" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"/> 

Esta manera de que funcione.