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?
The Android drag and drop framework enables you to add interactive drag and drop capabilities to your app. With drag and drop, users can copy or move text, images, objects—any content that can be represented by a URI—from one View to another within an app or, in multi-window mode, between apps.
A double tap acts as a double click. A double tap and hold allows you to grab and then drag.
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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