我自定义了 myview extends SurfaceView implements Callback
        在oncreat中引用自定义的view  view的参数设置是这样的。
         ViewGroup.LayoutParams params = new   ViewGroup.LayoutParams(
                                                  ViewGroup.LayoutParams.WRAP_CONTENT,
                                                        ViewGroup.LayoutParams.WRAP_CONTENT);

     但是这个view 总会占满父屏幕
   下面是图：
    
     那个灰色的就是自定义的view，我想把view的 宽度 和 高度 可以自己定义
        
           那个 params 的 参数 WRAP_CONTENT 是不能改变的，改变了对我来说就没有意义了。
                
public class MyView04 extends SurfaceView implements Callback {

private SurfaceHolder sfh;
private boolean drawFlag = true;
private Canvas canvas;

public MyView04(Context context) {
super(context);
init();
}

public MyView04(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

private void init() {
sfh = this.getHolder(); // 备注1
sfh.addCallback(this);
}


private Thread th = new Thread() {
public void run() {
while (drawFlag) {
draw();
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
};

public void draw() {
canvas = sfh.lockCanvas();
System.out.println("draw ..............");
Paint paint = new Paint();
paint.setTextSize(12);
canvas.drawColor(Color.GRAY);
canvas.drawText("asdfasdfsa", 0, 0, paint);
canvas.drawRect(0, 0, 2, 2, paint);
sfh.unlockCanvasAndPost(canvas);
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {

}

@Override
public void surfaceCreated(SurfaceHolder holder) {
th.start();
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
drawFlag = false;
}
         
        


-------------------------------这是主Activity--------------的代码


public class Main extends Activity {
private MyView04 myview;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(1);
        LinearLayout.LayoutParams layoutParams =   new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT);
        Button btn01 = new Button(this);
        btn01.setText("Button");
        ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
        btn01.setLayoutParams(params);
        layout.addView(btn01);
        
        
        
        myview = new MyView04(this);
        myview.setLayoutParams(params);
       
        layout.addView(myview);
        
        final Button btn02 = new Button(this);
        btn02.setText("Button");
        btn02.setLayoutParams(params);
        System.out.println("addview btn02..............................");
        layout.addView(btn02);
        
        setContentView(layout,layoutParams);
        
        
        
        btn01.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
int  width = myview.getWidth();
        int height  = myview.getHeight();
        
        int  width1 = btn02.getWidth();
        int height1  = btn02.getHeight();
        
       
        System.out.println("       myview  widht  is  "+width + "          myview height is "+ height);
        System.out.println("       myview  widht  is  "+width1 + "          myview height is "+ height1);

}
});
        
    }