转：http://www.eoeandroid.com/thread-100389-1-1.html
android 动态壁纸开发
参考：http://www.ophonesdn.com/article/show/278
推荐：http://www.oschina.net/code/snippet_203635_7426
http://blog.csdn.net/homebei2/article/details/6079580
resources/articles/live-wallpapers.html
自己做了一个非常简单的 只是想了解过程 源码见附件 步骤如下：
1、新建一个Android工程 然后进入工程的/res/文件夹，删除layout这个文件夹，当然里面的main.xml也会被删除的，对于Live Wallpaper来说传统的布局文件是不需要的。
2、在res下面新建一个xml文件夹 然后新建一个mylivewallpaper.xml 内容如下：
Java代码
- <?xml version="1.0" encoding="utf-8"?>
<wallpaper xmlns:android="http://schemas.android.com/apk/res/android"
android:thumbnail="@drawable/icon"
/>
复制代码
这里的android:thumbnail值得是你这个动态壁纸的小图标 会在你选着动态壁纸的时候出现 如下图：
这个可以自己选一个好看一点的
3、开始编写代码了 直接看吧
Java代码
- package com.lp.wallpaper;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
public class MyWallpaper extends WallpaperService{
private Handler handler = new Handler();
@Override
public void onCreate() {
System.out.println("service onCreate");
super.onCreate();
}
@Override
public void onDestroy() {
System.out.println("service onDestory");
super.onDestroy();
}
@Override
public Engine onCreateEngine() {
System.out.println("service onCreateEngine");
return new MyEngine();
}
private class MyEngine extends Engine{
private float x = 200;
private float y = 300;
private Paint mPaint;
private boolean mVisible = false;
private Runnable drawThread = new Runnable() {
public void run() {
drawWallpaper();
}
};
public MyEngine(){
System.out.println("MyEngine");
mPaint = new Paint();
mPaint.setColor(Color.RED);
mPaint.setAntiAlias(true);
mPaint.setStrokeWidth(4);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setTextSize(24);
}
@Override
public Bundle onCommand(String action, int x, int y, int z, Bundle extras, boolean resultRequested) {
// TODO Auto-generated method stub
System.out.println("onCommand");
return super.onCommand(action, x, y, z, extras, resultRequested);
}
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
System.out.println("onCreate");
super.onCreate(surfaceHolder);
//作用是使壁纸能响应touch event，默认是false
setTouchEventsEnabled(true);
}
@Override
public void onDestroy() {
System.out.println("onDestroy");
super.onDestroy();
handler.removeCallbacks(drawThread);
}
@Override
public void onOffsetsChanged(float xOffset, float yOffset, float xOffsetStep, float yOffsetStep, int xPixelOffset, int yPixelOffset) {
// TODO Auto-generated method stub
System.out.println("onoffsetsChanged");
super.onOffsetsChanged(xOffset, yOffset, xOffsetStep, yOffsetStep, xPixelOffset, yPixelOffset);
}
@Override
public void onVisibilityChanged(boolean visible) {
System.out.println("onVisibilityChanged");
mVisible = visible;
if (visible) {
//开始
handler.postDelayed(drawThread, 50);
} else {
handler.removeCallbacks(drawThread);
}
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
System.out.println("onSurfaceChanged");
// TODO Auto-generated method stub
super.onSurfaceChanged(holder, format, width, height);
}
@Override
public void onSurfaceCreated(SurfaceHolder holder) {
System.out.println("onSurfaceCreated");
super.onSurfaceCreated(holder);
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
System.out.println("onSurfaceDestoryed");
// TODO Auto-generated method stub
super.onSurfaceDestroyed(holder);
handler.removeCallbacks(drawThread);
}
@Override
public void onTouchEvent(MotionEvent event) {
System.out.println("onTouchEvent");
// TODO Auto-generated method stub
super.onTouchEvent(event);
}
private void drawWallpaper() {
SurfaceHolder holder = getSurfaceHolder();
Canvas canvas = holder.lockCanvas();
drawTime(canvas);
holder.unlockCanvasAndPost(canvas);
//循环执行
handler.postDelayed(drawThread, 50);
}
private void drawTime(Canvas canvas) {
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
String dataStr = sdf.format(date);
canvas.save();
canvas.drawColor(0xff00ff00);
canvas.drawText(dataStr, x, y, mPaint);
canvas.restore();
}
}
}
复制代码
实现的效果是一个动态改变的时间 如下图：
我们一一来解释：
onCreateEngine() ：
启动一个WallpaperService.Engine 这个engine才是负责绘制壁纸以及响应与用户交互事件的核心部件 这个方法也是必须要重写的 并且是WallpaperService和service的主要区别
onOffsetsChanged():
这个一般在几个屏幕滑动的时候调用 而且 当你拖动A屏幕向B屏幕过度时 会随着B屏幕的显示面积的变大或者变小一直调用这个方法
onVisibilityChanged()
这个是屏幕显示或者不显示的时候调用的 必须完全覆盖屏幕才会调用
onCommand()
可以给壁纸发送一些命令 让其执行
onTouchEvent()
处理壁纸的点击时间的
setTouchEventsEnabled(true)
作用是使壁纸能响应touch event，默认是false
其他的看名字应该就知道了 呵呵
这里也说下Engine的惯用写法吧
Java代码
- private class MyEngine extends Engine{
//这里定义一个线程
private Runnable drawThread = new Runnable() {
public void run() {
drawWallpaper();
}
};
//构造方法里面 一般初始化Paint对象
public MyEngine(){
System.out.println("MyEngine");
mPaint = new Paint();
mPaint.setColor(Color.RED);
mPaint.setAntiAlias(true);
mPaint.setStrokeWidth(4);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setTextSize(24);
}
//这里 调用setTouchEventsEnabled(true);即可
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
System.out.println("onCreate");
super.onCreate(surfaceHolder);
//作用是使壁纸能响应touch event，默认是false
setTouchEventsEnabled(true);
}
//取消callback
@Override
public void onDestroy() {
System.out.println("onDestroy");
super.onDestroy();
handler.removeCallbacks(drawThread);
}
//当显示的时候 绑定callback 不显示时 取消callback
@Override
public void onVisibilityChanged(boolean visible) {
System.out.println("onVisibilityChanged");
mVisible = visible;
if (visible) {
//开始
handler.postDelayed(drawThread, 50);
} else {
handler.removeCallbacks(drawThread);
}
}
@Override
public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) {
System.out.println("onSurfaceChanged");
// TODO Auto-generated method stub
super.onSurfaceChanged(holder, format, width, height);
}
@Override
public void onSurfaceCreated(SurfaceHolder holder) {
System.out.println("onSurfaceCreated");
super.onSurfaceCreated(holder);
}
//取消callback
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
System.out.println("onSurfaceDestoryed");
// TODO Auto-generated method stub
super.onSurfaceDestroyed(holder);
handler.removeCallbacks(drawThread);
}
//处理点击事件 比如说 点击时 出现水波等
@Override
public void onTouchEvent(MotionEvent event) {
System.out.println("onTouchEvent");
// TODO Auto-generated method stub
super.onTouchEvent(event);
}
//得到surfaceholder和canvas 并调用核心处理方法
private void drawWallpaper() {
SurfaceHolder holder = getSurfaceHolder();
Canvas canvas = holder.lockCanvas();
drawTime(canvas);
holder.unlockCanvasAndPost(canvas);
//循环执行
handler.postDelayed(drawThread, 50);
}
//核心处理方法
private void drawTime(Canvas canvas) {
}
}
复制代码
4、在AndroidManifes.xml里面注册service
Java代码
- <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.lp.wallpaper">
<uses-sdk android:minSdkVersion="7" />
<uses-feature android:name="android.software.live_wallpaper" />
<application
android:icon="@drawable/icon"
android:label="@string/app_name">
<service
android:label="@string/app_name"
android:name=".MyWallpaper"
android:permission="android.permission.BIND_WALLPAPER">
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService" />
</intent-filter>
<meta-data android:name="android.service.wallpaper" android:resource="@xml/mylivewallpaper" />
</service>
</application>
</manifest>
复制代码
除了
- android:resource="@xml/mylivewallpaper"
复制代码
是可以自己修改 其他的都是必须得 特别强调几个：
- <uses-sdk android:minSdkVersion="7" />
<uses-feature android:name="android.software.live_wallpaper" />
android:permission="android.permission.BIND_WALLPAPER"
复制代码
5、自己的一些关于方法执行顺序的测试信息：
当进入改壁纸的设置页面 但是还没有设置时
09-21 07:55:05.575: INFO/System.out(1337): service onCreate
09-21 07:55:05.614: INFO/System.out(1337): service onCreateEngine
09-21 07:55:05.634: INFO/System.out(1337): MyEngine
09-21 07:55:05.663: INFO/System.out(1337): onCreate
09-21 07:55:05.746: INFO/System.out(1337): onSurfaceCreated
09-21 07:55:05.753: INFO/System.out(1337): onSurfaceChanged
09-21 07:55:05.785: INFO/System.out(1337): onVisibilityChanged
当点击设置壁纸按钮后
09-21 07:55:19.434: INFO/System.out(1337): onTouchEvent
09-21 07:55:19.574: INFO/System.out(1337): onTouchEvent
09-21 07:55:20.283: INFO/System.out(1337): service onCreateEngine
09-21 07:55:20.294: INFO/System.out(1337): MyEngine
09-21 07:55:20.304: INFO/System.out(1337): onCreate
09-21 07:55:20.414: INFO/System.out(1337): onSurfaceCreated
09-21 07:55:20.424: INFO/System.out(1337): onSurfaceChanged
09-21 07:55:20.443: INFO/System.out(1337): onVisibilityChanged
09-21 07:55:20.443: INFO/System.out(1337): onoffsetsChanged
09-21 07:55:20.863: INFO/System.out(1337): onVisibilityChanged
09-21 07:55:21.305: INFO/System.out(1337): onSurfaceDestoryed
09-21 07:55:21.333: INFO/System.out(1337): onDestroy
在壁纸上面点击
09-21 07:55:34.654: INFO/System.out(1337): onTouchEvent
09-21 07:55:34.754: INFO/System.out(1337): onTouchEvent
09-21 07:55:34.754: INFO/System.out(1337): onCommand
启动其他程序 完全覆盖屏幕
09-21 07:56:03.855: INFO/System.out(1337): onTouchEvent
09-21 07:56:03.884: INFO/System.out(1337): onTouchEvent
09-21 07:56:04.494: INFO/System.out(1337): onVisibilityChanged
设置其他壁纸 代替自己的壁纸
09-21 07:56:34.893: INFO/System.out(1337): onSurfaceDestoryed
09-21 07:56:34.893: INFO/System.out(1337): onDestroy
09-21 07:56:34.953: INFO/System.out(1337): service onDestory
