android surfaceview 和activity之间数据传递

 public class MainActivity1 extends Activity  {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ll);

        MySurfaceView sv = (MySurfaceView)findViewById(R.id.sv);
        TextView tv = (TextView)findViewById(R.id.tv);
        sv.setCallBack(new CallBack(){//设置回调接口实现类
            @Override
            public void setTextView(String str) {
                tv.setText(str);//如果是在thread线程中调用的，这里包装一层handle再更新textview的值

            }           
        })

    }
    interface CallBack{//定义一个回调接口
        public void setTextView(String str);
    }
}
class MySurfaceView extends SurfaceView{
    private CallBack callBack = null;
    public MySurfaceView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }
    public void setCallBack(CallBack cb){//设置回调接口
        this.callBack = cb;
    }
    public void show(String str){//回调显示
        if(this.callBack!=null) this.callBack.setTextView(str);
    }
}