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2011.09.21——— android 動態壁紙開發
參考： http://www.ophonesdn.com/article/show/278
resources/articles/live-wallpapers.html

自己做了一個非常簡單的只是想了解過程源碼見附件步驟如下：

1、新建一個Android工程? 然后進入工程的/res/文件夾，刪除layout這個文件夾，當然里面的main.xml也會被刪除的，對于Live Wallpaper來說傳統的布局文件是不需要的。

2、在res下面新建一個xml文件夾然后新建一個mylivewallpaper.xml 內容如下：

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

這里的android:thumbnail值得是你這個動態壁紙的小圖標會在你選著動態壁紙的時候出現如下圖：

這個可以自己選一個好看一點的

3、開始編寫代碼了? 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);
			//作用是使壁紙能響應touch event，默認是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) {
            	//開始
    			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);
			
			//循環執行
			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();
		}
	}

}

實現的效果是一個動態改變的時間如下圖：

我們一一來解釋：
onCreateEngine() ：

啟動一個WallpaperService.Engine 這個engine才是負責繪制壁紙以及響應與用戶交互事件的核心部件這個方法也是必須要重寫的并且是WallpaperService和service的主要區別

onOffsetsChanged():

這個一般在幾個屏幕滑動的時候調用而且當你拖動A屏幕向B屏幕過度時會隨著B屏幕的顯示面積的變大或者變小一直調用這個方法

onVisibilityChanged()

這個是屏幕顯示或者不顯示的時候調用的必須完全覆蓋屏幕才會調用

onCommand()

可以給壁紙發送一些命令讓其執行

onTouchEvent()
處理壁紙的點擊時間的

setTouchEventsEnabled(true)

作用是使壁紙能響應touch event，默認是false

其他的看名字應該就知道了呵呵

這里也說下Engine的慣用寫法吧

    private class MyEngine extends Engine{
		//這里定義一個線程
		private Runnable drawThread = new Runnable() {
			public void run() {
				drawWallpaper();
			}
		};
		//構造方法里面 一般初始化Paint對象
		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);
		}

                //這里 調用setTouchEventsEnabled(true);即可
		@Override
		public void onCreate(SurfaceHolder surfaceHolder) {
			System.out.println("onCreate");
			super.onCreate(surfaceHolder);
			//作用是使壁紙能響應touch event，默認是false
			setTouchEventsEnabled(true);
		}
                //取消callback
		@Override
		public void onDestroy() {
			System.out.println("onDestroy");
			super.onDestroy();
			handler.removeCallbacks(drawThread);
		}
                //當顯示的時候 綁定callback 不顯示時  取消callback		
		@Override
        public void onVisibilityChanged(boolean visible) {
			System.out.println("onVisibilityChanged");
            mVisible = visible;
            if (visible) {
            	//開始
    			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);
		}
                //處理點擊事件 比如說 點擊時 出現水波等
		@Override
		public void onTouchEvent(MotionEvent event) {
			System.out.println("onTouchEvent");
			// TODO Auto-generated method stub
			super.onTouchEvent(event);
		}
		
		//得到surfaceholder和canvas 并調用核心處理方法
		private void drawWallpaper() {
			
			SurfaceHolder holder = getSurfaceHolder();
			Canvas canvas = holder.lockCanvas();
			drawTime(canvas);
			holder.unlockCanvasAndPost(canvas);
			
			//循環執行
			handler.postDelayed(drawThread, 50);
		}
                //核心處理方法
		private void drawTime(Canvas canvas) {
			
		}
	}

4、在AndroidManifes.xml里面注冊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須得特別強調幾個：

    <uses-sdk android:minSdkVersion="7" />
<uses-feature android:name="android.software.live_wallpaper" />
android:permission="android.permission.BIND_WALLPAPER"

5、自己的一些關于方法執行順序的測試信息：
當進入改壁紙的設置頁面但是還沒有設置時
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

當點擊設置壁紙按鈕后
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

在壁紙上面點擊
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

啟動其他程序完全覆蓋屏幕
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

設置其他壁紙代替自己的壁紙
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 動態壁紙開發

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