在Live Wallpaper设定中加入AdMob广告

自从Android 2.1中加入了动态壁纸，一下子牛叉了很多啊，漂亮的壁纸层出不穷，看上去老土的Android手机总算也是可以炫一下了。

动态壁纸基础

制作方法，网上太多了，虽然基本都是抄的，其实都是从sample上发展出来的，我也把要点记一下，每次写新的都要把老的工程打开看，啥记性……

1. res/xml中指定动态壁纸的xml文件：
   
   <?xml version="1.0" encoding="utf-8"?> <wallpaper xmlns:android="http://schemas.android.com/apk/res/android" android:settingsActivity="xxx.yyy.LiveWallpaperSettings" android:thumbnail="@drawable/icon" />

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

   
   这里是说明自己图标和设定Activity。
2. 还有一个设定Activity的xml文件，就是普通的PreferenceScreen，省略。
3. 创建WallpaperService的子类，需要再onCreateEngine方法中返回一个Engine，Engine中画画儿，就像用SurfaceView一样。 
   
   public class LiveWallpaper extends WallpaperService { public static final String SHARED_PREFS_NAME = "setting_file_name"; @Override public void onCreate() { super.onCreate(); } @Override public void onDestroy() { super.onDestroy(); } @Override public Engine onCreateEngine() { return new TestPatternEngine(); } class TestPatternEngine extends Engine implements SharedPreferences.OnSharedPreferenceChangeListener { private final Handler mHandler = new Handler(); private final Runnable mDrawPattern = new Runnable() { public void run() { drawFrame(); } }; private boolean mVisible; private SharedPreferences mPreferences; TestPatternEngine() { mPreferences = LiveWallpaper.this.getSharedPreferences( SHARED_PREFS_NAME, 0); mPreferences.registerOnSharedPreferenceChangeListener(this); onSharedPreferenceChanged(mPreferences, null); } public void onSharedPreferenceChanged(SharedPreferences prefs, String key) { } @Override public void onCreate(SurfaceHolder surfaceHolder) { super.onCreate(surfaceHolder); } @Override public void onDestroy() { super.onDestroy(); mHandler.removeCallbacks(mDrawPattern); } @Override public void onVisibilityChanged(boolean visible) { mVisible = visible; if (visible) { drawFrame(); } else { mHandler.removeCallbacks(mDrawPattern); } } @Override public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) { super.onSurfaceChanged(holder, format, width, height); drawFrame(); } @Override public void onSurfaceCreated(SurfaceHolder holder) { super.onSurfaceCreated(holder); } @Override public void onSurfaceDestroyed(SurfaceHolder holder) { super.onSurfaceDestroyed(holder); mVisible = false; mHandler.removeCallbacks(mDrawPattern); } @Override public void onOffsetsChanged(float xOffset, float yOffset, float xStep, float yStep, int xPixels, int yPixels) { drawFrame(); } void drawFrame() { final SurfaceHolder holder = getSurfaceHolder(); Canvas c = null; try { c = holder.lockCanvas(); if (c != null) { // draw something } } finally { if (c != null) holder.unlockCanvasAndPost(c); } mHandler.removeCallbacks(mDrawPattern); if (mVisible) { mHandler.postDelayed(mDrawPattern, 1000 / 25); } } } }

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   public class LiveWallpaper extends WallpaperService { public static final String SHARED_PREFS_NAME = "setting_file_name"; @Override public void onCreate() { super.onCreate(); } @Override public void onDestroy() { super.onDestroy(); } @Override public Engine onCreateEngine() { return new TestPatternEngine(); } class TestPatternEngine extends Engine implements SharedPreferences.OnSharedPreferenceChangeListener { private final Handler mHandler = new Handler(); private final Runnable mDrawPattern = new Runnable() { public void run() { drawFrame(); } }; private boolean mVisible; private SharedPreferences mPreferences; TestPatternEngine() { mPreferences = LiveWallpaper.this.getSharedPreferences( SHARED_PREFS_NAME, 0); mPreferences.registerOnSharedPreferenceChangeListener(this); onSharedPreferenceChanged(mPreferences, null); } public void onSharedPreferenceChanged(SharedPreferences prefs, String key) { } @Override public void onCreate(SurfaceHolder surfaceHolder) { super.onCreate(surfaceHolder); } @Override public void onDestroy() { super.onDestroy(); mHandler.removeCallbacks(mDrawPattern); } @Override public void onVisibilityChanged(boolean visible) { mVisible = visible; if (visible) { drawFrame(); } else { mHandler.removeCallbacks(mDrawPattern); } } @Override public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) { super.onSurfaceChanged(holder, format, width, height); drawFrame(); } @Override public void onSurfaceCreated(SurfaceHolder holder) { super.onSurfaceCreated(holder); } @Override public void onSurfaceDestroyed(SurfaceHolder holder) { super.onSurfaceDestroyed(holder); mVisible = false; mHandler.removeCallbacks(mDrawPattern); } @Override public void onOffsetsChanged(float xOffset, float yOffset, float xStep, float yStep, int xPixels, int yPixels) { drawFrame(); } void drawFrame() { final SurfaceHolder holder = getSurfaceHolder(); Canvas c = null; try { c = holder.lockCanvas(); if (c != null) { // draw something } } finally { if (c != null) holder.unlockCanvasAndPost(c); } mHandler.removeCallbacks(mDrawPattern); if (mVisible) { mHandler.postDelayed(mDrawPattern, 1000 / 25); } } } }

4. 还有设定Activity的实现：
   
   public class LiveWallpaperSettings extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener { @Override protected void onCreate(Bundle icicle) { super.onCreate(icicle); getPreferenceManager().setSharedPreferencesName(LiveWallpaper.SHARED_PREFS_NAME); addPreferencesFromResource(R.xml.livewallpaper_settings); getPreferenceManager().getSharedPreferences() .registerOnSharedPreferenceChangeListener(this); } @Override protected void onResume() { super.onResume(); } @Override protected void onDestroy() { getPreferenceManager().getSharedPreferences() .unregisterOnSharedPreferenceChangeListener(this); super.onDestroy(); } public void onSharedPreferenceChanged( SharedPreferences sharedPreferences, String key) { } }

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   public class LiveWallpaperSettings extends PreferenceActivity     implements SharedPreferences.OnSharedPreferenceChangeListener {     @Override     protected void onCreate(Bundle icicle) {         super.onCreate(icicle);         getPreferenceManager().setSharedPreferencesName(LiveWallpaper.SHARED_PREFS_NAME);         addPreferencesFromResource(R.xml.livewallpaper_settings);         getPreferenceManager().getSharedPreferences()             .registerOnSharedPreferenceChangeListener(this);     }       @Override     protected void onResume() {         super.onResume();     }       @Override     protected void onDestroy() {         getPreferenceManager().getSharedPreferences()             .unregisterOnSharedPreferenceChangeListener(this);         super.onDestroy();     }       public void onSharedPreferenceChanged(         SharedPreferences sharedPreferences, String key) {     } }

5. androidmanifest.xml中一定要加入的：
   
   <service android:name=".LiveWallpaper" android:label="@string/app_name" android:icon="@drawable/icon"> <intent-filter> <action android:name="android.service.wallpaper.WallpaperService" /> </intent-filter> <meta-data android:name="android.service.wallpaper" android:resource="@xml/livewallpaper" /> </service> <activity android:label="@string/livewallpaper_settings" android:name=".LiveWallpaperSettings" android:theme="@android:style/Theme.Light.WallpaperSettings" android:exported="true" android:icon="@drawable/icon"> </activity> <uses-sdk android:minSdkVersion="7" /> <uses-feature android:name="android.software.live_wallpaper" />

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   <service android:name=".LiveWallpaper" android:label="@string/app_name"  android:icon="@drawable/icon">     <intent-filter>         <action android:name="android.service.wallpaper.WallpaperService" />     </intent-filter>     <meta-data android:name="android.service.wallpaper" android:resource="@xml/livewallpaper" /> </service>   <activity android:label="@string/livewallpaper_settings"    android:name=".LiveWallpaperSettings"    android:theme="@android:style/Theme.Light.WallpaperSettings"    android:exported="true"    android:icon="@drawable/icon"> </activity>   <uses-sdk android:minSdkVersion="7" /> <uses-feature android:name="android.software.live_wallpaper" />

   
   “uses-feature android:name=”android.software.live_wallpaper””这句话要慎用啊！Google的电子市场会认这句话，然后把有些可以用的机器过滤掉，比如俺的破机器，本来是不支持的，升级到2.1按说是可以用的。我看了市场上很多有名的动态壁纸，就没有加这句话~~

另外，如果想在动态壁纸中使用OpenGL ES，请参考这篇文章：Android中使用OpenGL ES的一二事。

加入AdMob广告

上面都是废话，我这次想说的主题是如何在壁纸设定界面里加入AdMob广告，好不容易做好的东西，总是要意思意思是吧，加个广告是没法的事情了。

不同于一般的Activity，直接加入AdMob是不行的，连个Layout都没有，而且直接加到壁纸上则非常糟糕，谁也不希望好好的背景上塞一个广告。所以一般动态壁纸的广告都加在设置界面里，这样还真有些不容易。

一般有两种方法，把Admob的adView当做一个Preference，直接加入xml就好。

相对的admob_preference的配置：

这里还是有些学问的，网上查一下会有无数的“AdView missing required XML attribute ‘adSize’”的问题，据说是4.1.0之后带来的问题，一定要这么写（将”http://schemas.android.com/apk/lib/com.google.ads”当做一个命名空间，而不是加入自己的程序中）才能不出错，至少大家是如此说的，可惜我不行，怎么写都有这个错，耗费了两个小时尝试了各种写法，还是不行啊！！最后还是写在代码里了：（

不过光这么写貌似还是不行，AdView周围还有留白，貌似是PreferenceActivity里的padding，去不掉，最后还是使用了Tab的方式：

对应的layout：

大概就是如此了。

对了还有一个浪费了我两个多小时的问题，对于已经按照的live wallpaper，你修改了setting的Activity，直接覆盖安装是没效果的，点配置还是出现以前的Activity，发现这一点之前，我做了不知几百次修改上传，都快整挂了，Google怎么考虑的？！