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

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：