android 拖拽图片

原文：http://blog.csdn.net/dany1202/article/details/6106354

拖拽图片效果

方法一：



import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class DragSample01 extends Activity {
ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drag_sample01);
img = (ImageView)findViewById(R.id.img_view);

img.setOnTouchListener(new OnTouchListener(){
private int mx, my;
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_MOVE:
mx = (int)(event.getRawX());
my = (int)(event.getRawY() - 50);

v.layout(mx - img.getWidth()/2, my - img.getHeight()/2, mx + img.getWidth()/2, my + img.getHeight()/2);
break;
}
return true;
}});
}
}

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class DragSample01 extends Activity {
ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drag_sample01);
img = (ImageView)findViewById(R.id.img_view);

img.setOnTouchListener(new OnTouchListener(){
private int mx, my;
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_MOVE:
mx = (int)(event.getRawX());
my = (int)(event.getRawY() - 50);

v.layout(mx - img.getWidth()/2, my - img.getHeight()/2, mx + img.getWidth()/2, my + img.getHeight()/2);
break;
}
return true;
}});
}
}

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
public class DragSample01 extends Activity {
ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drag_sample01);
img = (ImageView)findViewById(R.id.img_view);

img.setOnTouchListener(new OnTouchListener(){
private float x, y;
private int mx, my;
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
x = event.getX();
y = event.getY();
case MotionEvent.ACTION_MOVE:
mx = (int)(event.getRawX() - x);
my = (int)(event.getRawY() - 50 - y);

v.layout(mx, my, mx + v.getWidth(), my + v.getHeight());
break;
}
return true;
}});
}
}