Android游戏开发学习(5)--实现Button悬浮于与SurfaceView之上

原文：http://daikainan.iteye.com/blog/1407355

实现Button悬浮于与SurfaceView之上实现

先看效果：

注意：你实现的SurfaceView和android中的Button,EditView是同级的，不能把一个包含在另一个里面

1.创建自己的SurfaceView类,一定要实现2个参数的那个函数，因为你要在XMl中使用，第二个参数指的自定义的组件的一些属性长宽等。

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

<dk.game.GameSurfaceView android:id="@+id/gameView"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"/>

 

2.处理SurfaceView中事件一定要在Activity中。我们在xml中定义我们的surfaceview 和 组件button、textview等等的时候 他们是同一级别的！！而不是把button包含在surfaceview里，所以虽然在surfaceview中可以根据id索引到button但绑定的时候是无法找到button的，只有我们的 activitysetContentView(R.layout.main); 显示的button，所以只能在显示它的activity中去绑定，这里需要注意

@Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       requestWindowFeature(Window.FEATURE_NO_TITLE);
       getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
       setContentView(R.layout.main);
   }
   /**
    * 下一张按钮事件
    * @param view
    */
   public void nextBt(View view){
    GameSurfaceView.cn=2;
   }
   /**
    * 上一张按钮事件
    * @param view
    */
   public void preBt(View view){
    GameSurfaceView.cn=1;
   }

 

3.在Layout中是相对布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/relativeLayout1"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" >

       <dk.game.GameSurfaceView android:id="@+id/gameView"
           android:layout_width="fill_parent"
           android:layout_height="fill_parent"/>

       <Button
           android:id="@+id/nextBt"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_alignParentRight="true"
           android:layout_alignParentBottom="true"
           android:text="下一张"
           android:onClick="nextBt" />

       <Button
           android:id="@+id/preBt"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_toLeftOf="@id/nextBt"
           android:layout_alignParentBottom="true"
           android:text="上一张"
           android:onClick="preBt" />

</RelativeLayout>

 

GameSurfaceView类的源码如下

package dk.game;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class GameSurfaceView extends SurfaceView implements Runnable ,SurfaceHolder.Callback{

    private Thread gameViewThread;
    private SurfaceHolder surfaceHolder;
    private Paint paint;
    private boolean runFlag=false;
    public static int screen_width,screen_height;
    protected Resources resources;
    private Canvas canvas;
    private Bitmap bmp_bg1,bmp_bg2;
    public static int cn=1;

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


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

    private void init(){
        surfaceHolder=getHolder();
        surfaceHolder.addCallback(this);
        resources=getResources();

        paint=new Paint();
        paint.setAntiAlias(true);

        bmp_bg1=BitmapFactory.decodeResource(getResources(), R.drawable.bg1);
        bmp_bg2=BitmapFactory.decodeResource(getResources(), R.drawable.bg2);
    //  setFocusable(true);
    //  setFocusableInTouchMode(true);
    //  setClickable(true);
        setKeepScreenOn(true);
    }

    public void draw(Canvas canvas,Paint paint){
        canvas.drawColor(Color.BLACK);
        if(cn==1){
            canvas.drawBitmap(bmp_bg1, 0,0, paint);
        }else if(cn==2){
            canvas.drawBitmap(bmp_bg2, 0,0, paint);
        }
    }

    @Override
    public void run() {
        while(runFlag){
            try{
                canvas=surfaceHolder.lockCanvas();
                long startTime=System.currentTimeMillis();
                canvas.drawColor(Color.BLACK);
                draw(canvas,paint);
                long endTime=System.currentTimeMillis();
                if(50>(endTime-startTime)){
                    Thread.sleep(50-(endTime-startTime));
                }
            }catch (Exception e) {
                Log.e("Error", "刷新屏幕出错！"+e);
            }finally{
                if(canvas!=null){
                    surfaceHolder.unlockCanvasAndPost(canvas);
                }
            }
        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        screen_width=getWidth();
        screen_height=getHeight();
        runFlag=true;
        gameViewThread=new Thread(this);
        gameViewThread.start();
    }

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

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

 

源码下载：

• SurfaceViewActivity.rar (812.7 KB)