imageview 全屏 拖动

引用：http://www.eoeandroid.com/forum-viewthread-tid-69849-highlight.html

1.素材

res/drawable-hdpi/  目录下放四个jpg文件

beijing1_b.jpg

beijing2_b.jpg

beijing3_b.jpg

beijing4_b.jpg

2.main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/linear"

android:orientation="vertical"

android:layout_width="fill_parent" 

android:layout_height="fill_parent"

>

<ImageButton android:layout_width="100dip"

android:layout_height="100dip"

android:src="@drawable/beijing1_b"/>

<ImageButton android:layout_width="100dip"

android:layout_height="100dip"

android:src="@drawable/beijing2_b"/>

<ImageButton android:layout_width="100dip"

android:layout_height="100dip"

android:src="@drawable/beijing3_b"/>

<ImageButton android:layout_width="100dip"

android:layout_height="100dip"

android:src="@drawable/beijing4_b"/>

</LinearLayout>

3.java

package com.zj;

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;

import android.widget.LinearLayout;

public class ImageViewMoveActivity extends Activity {

private int point1;

private int point2;

private int startX;

private int startY;

private int p=4;

private LinearLayout lLayout;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

lLayout = (LinearLayout)findViewById(R.id.linear);

OnTouchListener touchListener = new OnTouchListener(){

@Override

public boolean onTouch(View v, MotionEvent event) {//定义OnTouchListener 用于监听所有动作 并注册LinearLayour的所有View 实现为：

int action = event.getAction();

int x = (int) event.getRawX();

int y = (int) event.getRawY();

switch(action){

case MotionEvent.ACTION_DOWN://鼠标按下 拖拉动作开始

point1 = v.getTop();

startX = (int)event.getX();

startY = y - v.getTop();

break;

case MotionEvent.ACTION_MOVE://鼠标移动 拖拉动作进行中

v.layout(x - startX, y - startY, x + v.getWidth()- startX, y - startY + v.getHeight());

v.bringToFront();

v.postInvalidate();

break;

case MotionEvent.ACTION_UP://鼠标释放 拖拉动作结束

point2 = v.getTop();

int dest = getLocation(v);//计算插入位置 位于哪两个相邻View之间

lLayout.removeView(v);//remove ori view, and then add view here

lLayout.addView(v, dest);

break;

}

return false;

}

};

for(int i=0;i<lLayout.getChildCount();i++){

ImageView iv = (ImageView)lLayout.getChildAt(i);//to listener all ImageView

if(iv !=null){

iv.setOnTouchListener(touchListener);

}

else {

//error, view is null!

}

}

}

//4. getLocation(View) 用于： 根据目标View 判断待插入的位置 即：哪2个相邻ImageView 之间 实现为：

public int getLocation(View v){

for(int i=0;i<lLayout.getChildCount();i++){

ImageView iv = (ImageView)lLayout.getChildAt(i);ImageView iv2 = (ImageView)lLayout.getChildAt(i+1);

if(iv.getTop()< v.getTop() && iv2.getTop() > v.getTop()){

//refer delta of point1 & point2

if(point1 < point2){//drag to bottom

return i+1;

}

else {//drag to up

return i+1;

}

}

}

//otherwise return last location

return lLayout.getChildCount()-1;

}

}