2011.09.21——— android 动态壁纸开发

2011.09.21——— android 动态壁纸开发
参考： http://www.ophonesdn.com/article/show/278
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：

    <?xml version="1.0" encoding="utf-8"?>
<wallpaper xmlns:android="http://schemas.android.com/apk/res/android"
	android:thumbnail="@drawable/icon"
/>

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

    
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();
		}
	}

}

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

    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) {
			
		}
	}

4、在AndroidManifes.xml里面注册service

    <?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>

除了

    android:resource="@xml/mylivewallpaper"

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"

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

另：Engine的生命周期：

2011.09.21——— android 动态壁纸开发

更多文章、技术交流、商务合作、联系博主

微信扫码或搜索：z360901061

微信扫一扫加我为好友

QQ号联系： 360901061

您的支持是博主写作最大的动力，如果您喜欢我的文章，感觉我的文章对您有帮助，请用微信扫描下面二维码支持博主2元、5元、10元、20元等您想捐的金额吧，狠狠点击下面给点支持吧，站长非常感激您！手机微信长按不能支付解决办法：请将微信支付二维码保存到相册，切换到微信，然后点击微信右上角扫一扫功能，选择支付二维码完成支付。

【本文对您有帮助就好】元

2元

5元

10元

20元

自定义