触摸和Android的拖动图像 [英] Touch and drag image in android

问题描述

我工作的一些例子中，我想拖对应触摸Android上的图像。没有任何人有关于如何我能做到这一点的想法？

解决方案

 公共类TouchBall延伸活动{


@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;

    INT W = getWindowManager（）getDefaultDisplay（）的getWidth（） -  25。
    INT H = getWindowManager（）getDefaultDisplay（）的getHeight（） -  25。

    BallView ballView =新BallView（这一点，W，H）;
    的setContentView（ballView）;
}


}
公共类BallView扩展了SurfaceView实现SurfaceHolder.Callback {

    私人位图位图;
    私人MyThread线程;
    私人INT X = 20，Y = 20; INT宽度，高度;

    公共BallView（上下文的背景下，INT W，INT高）{
        超（上下文）;

        宽= W;
        高度= H;
        线程=新MyThread（getHolder（），这一点）;
        。getHolder（）的addCallback（本）;
        setFocusable（真正的）;
    }

    @覆盖
    保护无效的OnDraw（帆布油画）{
        super.onDraw（画布）;

        位= BitmapFactory.de codeResource（getResources（），R.drawable.ball_green）;
        canvas.drawColor（Color.BLUE）; //为了使背景
        canvas.drawBitmap（位图，x轴（bitmap.getWidth（）/ 2），y轴（bitmap.getHeight（）/ 2），空）;


    }

    @覆盖
    公共布尔的onTouchEvent（MotionEvent事件）{

        X =（int）的event.getX（）;
        Y =（INT）event.getY（）;

        如果（Xα25）
                X = 25;
         如果（X＆GT;宽）
                X =宽度;
         如果（γα25）
                Y = 25;
         如果（Y＆GT; 405）
                Y = 405;
        返回true;
    }

    @覆盖
    公共无效surfaceChanged（SurfaceHolder持有人，INT格式，诠释的宽度，高度INT）{
        // TODO自动生成方法存根

    }

    @覆盖
    公共无效surfaceCreated（SurfaceHolder持有者）{

        thread.startrun（真正的）;
        thread.start（）;

    }

    @覆盖
    公共无效surfaceDestroyed（SurfaceHolder持有者）{


        thread.startrun（假）;
        使用Thread.stop（）;

    }
 }
 

主题：

 公共类MyThread继承Thread {

私人SurfaceHolder msurfaceHolder;
私人BallView mballView;
私人布尔mrun = FALSE;

公共MyThread（SurfaceHolder持有人，BallView ballView）{

    msurfaceHolder =持有人;
    mballView = ballView;
}

公共无效startrun（布尔运行）{

    mrun =运行;
}

@覆盖
公共无效的run（）{

    super.run（）;
     帆布油画;
     而（mrun）{
        帆布= NULL;
         尝试 {
             帆布= msurfaceHolder.lockCanvas（空）;
              同步（msurfaceHolder）{
               mballView.onDraw（画布）;
             }
         } 最后 {
                 如果（帆布！= NULL）{
                 msurfaceHolder.unlockCanvasAndPost（画布）;
             }
         }
     }
  }

}
 

I am working on some example in which i want to drag the image corresponding to touch in Android. Does anybody have an idea about how I can do it?

解决方案

public class TouchBall extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    int w=getWindowManager().getDefaultDisplay().getWidth()-25;
    int h=getWindowManager().getDefaultDisplay().getHeight()-25;

    BallView ballView=new BallView(this,w,h);
    setContentView(ballView);
}


}
public class BallView extends SurfaceView implements SurfaceHolder.Callback {

    private Bitmap bitmap ;
    private MyThread thread;
    private int x=20,y=20;int width,height;

    public BallView(Context context,int w,int h) {
        super(context);

        width=w;
        height=h;
        thread=new MyThread(getHolder(),this);
        getHolder().addCallback(this);
        setFocusable(true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        bitmap =BitmapFactory.decodeResource(getResources(), R.drawable.ball_green);
        canvas.drawColor(Color.BLUE);//To make background 
        canvas.drawBitmap(bitmap,x-(bitmap.getWidth()/2),y-(bitmap.getHeight()/2),null);


    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        x=(int)event.getX();
        y=(int)event.getY();

        if(x<25)
                x=25;
         if(x> width)   
                x=width;
         if(y <25)
                y=25;
         if(y > 405)
                y=405;      
        return true;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {
        // TODO Auto-generated method stub

    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {

        thread.startrun(true);
        thread.start();

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {


        thread.startrun(false);
        thread.stop();

    }   
 }

thread:

public class MyThread extends Thread {

private SurfaceHolder msurfaceHolder;
private BallView mballView;
private boolean mrun =false;

public MyThread(SurfaceHolder holder, BallView ballView) {

    msurfaceHolder = holder;
    mballView=ballView;
}

public void startrun(boolean run) {

    mrun=run;
}

@Override
public void run() {

    super.run();
     Canvas canvas;
     while (mrun) {
        canvas=null;
         try {
             canvas = msurfaceHolder.lockCanvas(null);
              synchronized (msurfaceHolder) {
               mballView.onDraw(canvas);
             }
         } finally {
                 if (canvas != null) {
                 msurfaceHolder.unlockCanvasAndPost(canvas);
             }
         }
     }
  }

}

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