说明：
当内部存储空间不足的情况下不加载壁纸，以节省资源。
修改方式：在WallpaperManagerService.java中进行修改；
思路：首先在加载壁纸之前我们需要判断当前存储空间是否紧张。代码如下：（源码地址）
public boolean isStorageLow(){
try{
if(mIpackageManager!=null){
return mIPackageManager.isStorageLow();
}
}catch(RemoteException e){
}
return false;
}
boolean bindWallpaperComponentLocked(ComponentName componentName, boolean force,
0813 boolean fromUser, WallpaperData wallpaper, IRemoteCallback reply) {
0814 if (DEBUG) Slog.v(TAG, "bindWallpaperComponentLocked: componentName=" + componentName);
0813 boolean fromUser, WallpaperData wallpaper, IRemoteCallback reply) {
0814 if (DEBUG) Slog.v(TAG, "bindWallpaperComponentLocked: componentName=" + componentName);
if(isStorageLow()){return false;}
0815 // Has the component changed?
0816 if (!force) {
0817 if (wallpaper.connection != null) {
0818 if (wallpaper.wallpaperComponent == null) {
0819 if (componentName == null) {
0820 if (DEBUG) Slog.v(TAG, "bindWallpaperComponentLocked: still using default");
0821 // Still using default wallpaper.
0822 return true;
0823 }
0824 } else if (wallpaper.wallpaperComponent.equals(componentName)) {
0825 // Changing to same wallpaper.
0826 if (DEBUG) Slog.v(TAG, "same wallpaper");
0827 return true;
0828 }
0829 }
0830 }
0831
0832 try {
0833 if (componentName == null) {
0834 String defaultComponent =
0835 mContext.getString(com.android.internal.R.string.default_wallpaper_component);
0836 if (defaultComponent != null) {
0837 // See if there is a default wallpaper component specified
0838 componentName = ComponentName.unflattenFromString(defaultComponent);
0839 if (DEBUG) Slog.v(TAG, "Use default component wallpaper:" + componentName);
0840 }
0841 if (componentName == null) {
0842 // Fall back to static image wallpaper
0843 componentName = IMAGE_WALLPAPER;
0844 //clearWallpaperComponentLocked();
0845 //return;
0846 if (DEBUG) Slog.v(TAG, "Using image wallpaper");
0847 }
0848 }
0849 int serviceUserId = wallpaper.userId;
0850 ServiceInfo si = mIPackageManager.getServiceInfo(componentName,
0851 PackageManager.GET_META_DATA | PackageManager.GET_PERMISSIONS, serviceUserId);
0852 if (si == null) {
0853 // The wallpaper component we're trying to use doesn't exist
0854 Slog.w(TAG, "Attempted wallpaper " + componentName + " is unavailable");
0855 return false;
0856 }
0857 if (!android.Manifest.permission.BIND_WALLPAPER.equals(si.permission)) {
0858 String msg = "Selected service does not require "
0859 + android.Manifest.permission.BIND_WALLPAPER
0860 + ": " + componentName;
0861 if (fromUser) {
0862 throw new SecurityException(msg);
0863 }
0864 Slog.w(TAG, msg);
0865 return false;
0866 }
0867
0868 WallpaperInfo wi = null;
0869
0870 Intent intent = new Intent(WallpaperService.SERVICE_INTERFACE);
0871 if (componentName != null && !componentName.equals(IMAGE_WALLPAPER)) {
0872 // Make sure the selected service is actually a wallpaper service.
0873 List<ResolveInfo> ris =
0874 mIPackageManager.queryIntentServices(intent,
0875 intent.resolveTypeIfNeeded(mContext.getContentResolver()),
0876 PackageManager.GET_META_DATA, serviceUserId);
0877 for (int i=0; i<ris.size(); i++) {
0878 ServiceInfo rsi = ris.get(i).serviceInfo;
0879 if (rsi.name.equals(si.name) &&
0880 rsi.packageName.equals(si.packageName)) {
0881 try {
0882 wi = new WallpaperInfo(mContext, ris.get(i));
0883 } catch (XmlPullParserException e) {
0884 if (fromUser) {
0885 throw new IllegalArgumentException(e);
0886 }
0887 Slog.w(TAG, e);
0888 return false;
0889 } catch (IOException e) {
0890 if (fromUser) {
0891 throw new IllegalArgumentException(e);
0892 }
0893 Slog.w(TAG, e);
0894 return false;
0895 }
0896 break;
0897 }
0898 }
0899 if (wi == null) {
0900 String msg = "Selected service is not a wallpaper: "
0901 + componentName;
0902 if (fromUser) {
0903 throw new SecurityException(msg);
0904 }
0905 Slog.w(TAG, msg);
0906 return false;
0907 }
0908 }
0909
0910 // Bind the service!
0911 if (DEBUG) Slog.v(TAG, "Binding to:" + componentName);
0912 WallpaperConnection newConn = new WallpaperConnection(wi, wallpaper);
0913 intent.setComponent(componentName);
0914 intent.putExtra(Intent.EXTRA_CLIENT_LABEL,
0915 com.android.internal.R.string.wallpaper_binding_label);
0916 intent.putExtra(Intent.EXTRA_CLIENT_INTENT, PendingIntent.getActivityAsUser(
0917 mContext, 0,
0918 Intent.createChooser(new Intent(Intent.ACTION_SET_WALLPAPER),
0919 mContext.getText(com.android.internal.R.string.chooser_wallpaper)),
0920 0, null, new UserHandle(serviceUserId)));
0921 if (!mContext.bindServiceAsUser(intent, newConn,
0922 Context.BIND_AUTO_CREATE | Context.BIND_SHOWING_UI,
0923 new UserHandle(serviceUserId))) {
0924 String msg = "Unable to bind service: "
0925 + componentName;
0926 if (fromUser) {
0927 throw new IllegalArgumentException(msg);
0928 }
0929 Slog.w(TAG, msg);
0930 return false;
0931 }
0932 if (wallpaper.userId == mCurrentUserId && mLastWallpaper != null) {
0933 detachWallpaperLocked(mLastWallpaper);
0934 }
0935 wallpaper.wallpaperComponent = componentName;
0936 wallpaper.connection = newConn;
0937 wallpaper.lastDiedTime = SystemClock.uptimeMillis();
0938 newConn.mReply = reply;
0939 try {
0940 if (wallpaper.userId == mCurrentUserId) {
0941 if (DEBUG)
0942 Slog.v(TAG, "Adding window token: " + newConn.mToken);
0943 mIWindowManager.addWindowToken(newConn.mToken,
0944 WindowManager.LayoutParams.TYPE_WALLPAPER);
0945 mLastWallpaper = wallpaper;
0946 }
0947 } catch (RemoteException e) {
0948 }
0949 } catch (RemoteException e) {
0950 String msg = "Remote exception for " + componentName + " " + e;
0951 if (fromUser) {
0952 throw new IllegalArgumentException(msg);
0953 }
0954 Slog.w(TAG, msg);
0955 return false;
0956 }
0957 return true;
0958 }
注！
红色部分为增加代码。