其实，在android中画廊视图Gallery和ImageSwitcher组件的使用一文中就介绍过ImageSwitcher的使用，今天这里封装一个自定义的ImageSwitcher，它带有使用手势滑动效果和动画效果，和提供自动切换的接口，以后有这样的需求可以直接拿来用，代码如下：
MyImageSwitcher：
package com.home.testimageswitcher;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.OnGestureListener;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.Toast;
public class MyImageSwitcher extends ImageSwitcher {
private Thread t;// 自动切换图片线程
private GestureDetector detector;
private Context context;
private int index;// 图片位置索引
private int[] imageIds;
public boolean hasStarted = false;// 是否已开启自动切换接口
private boolean isSwitching = false;// 是否在自动切换图片
public boolean isDown = false;// 是否是按下状态
public boolean isFling = false;// 是否正在滑动
private int direction = 1;// 方向：1为向左滑动；-1为向右滑动
public Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 1) {
setImage(direction);
}
}
};
public MyImageSwitcher(Context context, int[] imageIds) {
super(context);
init(context, imageIds);
}
class MyOnGestureListener implements OnGestureListener {
@Override
public boolean onDown(MotionEvent e) {
isDown = true;
return false;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
isFling = true;
isSwitching = false;// 滑动过程停止切换
float instance = e1.getX() - e2.getX();
if (instance > 10) {
direction = 1;
index++;
if (index > imageIds.length - 1) {
index = 0;
}
setImage(direction);
} else if (instance < -10) {
direction = -1;
index--;
if (index < 0) {
index = imageIds.length - 1;
}
setImage(direction);
}
if (hasStarted) {
startSwitching();
}
return false;
}
@Override
public void onLongPress(MotionEvent e) {
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,
float distanceX, float distanceY) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
if (isDown && !isFling) {
Toast.makeText(context, "点击了图片", Toast.LENGTH_SHORT).show();
}
isDown = false;
isFling = false;
}
return super.onTouchEvent(event);
}
/**
* 初始化
*
* @param context
*/
private void init(Context context, int[] imageIds) {
if (imageIds == null || imageIds.length <= 0) {
return;
}
this.context = context;
this.imageIds = imageIds;
if (imageIds.length > 1) {
this.detector = new GestureDetector(context,
new MyOnGestureListener());
this.setOnTouchListener(new MyOnTouchListener());
this.setLongClickable(true);
}
this.setFactory(new MyFactory());
this.setImageResource(imageIds[index]);
}
class MyOnTouchListener implements OnTouchListener {
@Override
public boolean onTouch(View v, MotionEvent event) {
return detector.onTouchEvent(event);
}
}
class MyFactory implements ViewFactory {
@Override
public View makeView() {
ImageView imageView = new ImageView(context);
imageView.setBackgroundColor(0xFF000000);
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
return imageView;
}
}
/**
* 启动线程切换图片
*/
public void startSwitching() {
if (imageIds == null || imageIds.length <= 1) {
return;
}
isSwitching = true;
if (t == null || !t.isAlive()) {
t = new Thread() {
public void run() {
while (isSwitching) {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
hasStarted = true;
if (direction == 1) {
index++;
} else {
index--;
}
if (index > imageIds.length - 1) {
index = 0;
}
if (index < 0) {
index = imageIds.length - 1;
}
Message msg = new Message();
msg.what = 1;
handler.sendMessage(msg);
}
};
};
t.start();
}
}
/**
* 根据方向设置图片和动画效果
*
* @param direction
*/
private void setImage(int direction) {
if (direction == 1) {
setInAnimation(context, R.anim.push_left_in);
setOutAnimation(context, R.anim.push_left_out);
setImageResource(imageIds[index]);
} else {
setInAnimation(context, R.anim.push_right_in);
setOutAnimation(context, R.anim.push_right_out);
setImageResource(imageIds[index]);
}
}
}
调用Activity：
package com.home.testimageswitcher;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
private int[] imageIds = { R.drawable.test1, R.drawable.test2,
R.drawable.test3, R.drawable.test4, R.drawable.test5 };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MyImageSwitcher switcher = new MyImageSwitcher(this, imageIds);
setContentView(switcher);
switcher.startSwitching();// 开启自动切换
}
}
动画系列：
push_left_in.xml：
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="500"
android:fromXDelta="100%p"
android:toXDelta="0" />
<alpha
android:duration="500"
android:fromAlpha="0.1"
android:toAlpha="1.0" />
</set>
push_left_out.xml：
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="500"
android:fromXDelta="0"
android:toXDelta="-100%p" />
<alpha
android:duration="500"
android:fromAlpha="1.0"
android:toAlpha="0.1" />
</set>
push_right_in.xml：
<?xml version="1.0" encoding="UTF-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="500"
android:fromXDelta="-100%p"
android:toXDelta="0" />
<alpha
android:duration="500"
android:fromAlpha="0.1"
android:toAlpha="1.0" />
</set>
push_right_out.xml：
<?xml version="1.0" encoding="UTF-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
<translate
android:duration="500"
android:fromXDelta="0"
android:toXDelta="100%p" />
<alpha
android:duration="500"
android:fromAlpha="1.0"
android:toAlpha="0.1" />
</set>
自定义一个ImageSwitcher,布布扣,bubuko.com
原文：http://blog.csdn.net/u010142437/article/details/20768713