装门做特卖的网站网站后台这么做视频教程
如图，原生系统上，设备上的壁纸 显示系统内置壁纸。如果没有添加内置壁纸，就显示默认的壁纸。点击进去就是预览页面
扩展下，默认壁纸在
frameworks/base/core/res/res/drawable-sw720dp-nodpi/default_wallpaper.png
frameworks/base/core/res/res/drawable-nodpi/default_wallpaper.png
frameworks/base/core/res/res/drawable-sw600dp-nodpi/default_wallpaper.png
添加默认壁纸，追溯下代码。
1.ThemePicker
当前页面是 com.android.wallpaper/.picker.CustomizationPickerActivity ，对应源码 packages/apps/ThemePicker 。
但是在此目录下找不到 CustomizationPickerActivity 。
查看 packages/apps/ThemePicker/Android.bp ，
java_defaults {name: "ThemePicker_defaults",static_libs: ["guava","monet","renderscript_toolkit","wallpaper-common-deps","SettingsLibSettingsTheme","SystemUI-statsd","styleprotoslite","androidx.lifecycle_lifecycle-livedata-ktx","androidx.lifecycle_lifecycle-runtime-ktx","androidx.lifecycle_lifecycle-viewmodel-ktx","androidx.recyclerview_recyclerview","SystemUICustomizationLib",],jni_libs: ["librenderscript-toolkit",],srcs: [":WallpaperPicker2_srcs",":ThemePicker_srcs",":ThemePicker_src_overrides",],use_embedded_native_libs: true,resource_zips: [":WallpaperPicker2_res", ":ThemePicker_res", ":ThemePicker_res_overrides"],optimize: {enabled: false,},kotlincflags: ["-Xjvm-default=enable"],certificate: "",privileged: true,system_ext_specific: true,
}//
// Build app code.
//
android_app {name: "ThemePicker",defaults: ["ThemePicker_defaults"],platform_apis: true,manifest: "AndroidManifest.xml",additional_manifests: [":WallpaperPicker2_Manifest"],overrides: ["WallpaperPicker2"],
}
ThemePicker 引用了 WallpaperPicker2，在 WallpaperPicker2 里找到了 CustomizationPickerActivity 。
2.WallpaperPicker2
找到 DefaultCategoryProvider.java ，
/*** AsyncTask subclass used for fetching all the categories and pushing them one at a time to* the receiver.*/protected static class FetchCategoriesTask extends AsyncTask<Void, Category, Void> {private CategoryReceiver mReceiver;private PartnerProvider mPartnerProvider;protected final Context mAppContext;public FetchCategoriesTask(CategoryReceiver receiver, Context context) {mReceiver = receiver;mAppContext = context.getApplicationContext();}@Overrideprotected Void doInBackground(Void... voids) {mPartnerProvider = InjectorProvider.getInjector().getPartnerProvider(mAppContext);// "My photos" wallpapersandroid.util.Log.d("luoah", "[DefaultCategoryProvider] doInBackground ,My photos wallpapers");publishProgress(getMyPhotosCategory());android.util.Log.d("luoah", "[DefaultCategoryProvider] doInBackground ,publishDeviceCategories");publishDeviceCategories();// Legacy On-device wallpapers. Only show if on mobile.android.util.Log.d("luoah", "[DefaultCategoryProvider] doInBackground ,getOnDeviceCategory");publishProgress(getOnDeviceCategory());// Live wallpapers -- if the device supports them.if (mAppContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_LIVE_WALLPAPER)) { List<WallpaperInfo> liveWallpapers = LiveWallpaperInfo.getAll(mAppContext, getExcludedLiveWallpaperPackageNames());android.util.Log.d("luoah", "[DefaultCategoryProvider] doInBackground ,liveWallpapers.size():"+liveWallpapers.size());if (liveWallpapers.size() > 0) {publishProgress(new ThirdPartyLiveWallpaperCategory(mAppContext.getString(R.string.live_wallpapers_category_title),mAppContext.getString(R.string.live_wallpaper_collection_id),liveWallpapers,PRIORITY_LIVE,getExcludedLiveWallpaperPackageNames()));}}// Third party apps.android.util.Log.d("luoah", "[DefaultCategoryProvider] doInBackground ,Third party apps");List<ThirdPartyAppCategory> thirdPartyApps = ThirdPartyAppCategory.getAll(mAppContext, PRIORITY_THIRD_PARTY, getExcludedThirdPartyPackageNames());for (ThirdPartyAppCategory thirdPartyApp : thirdPartyApps) {publishProgress(thirdPartyApp);}return null;}
2.1 图库上的壁纸
2.2 设备上的壁纸
packages/apps/WallpaperPicker2/src/com/android/wallpaper/module/DefaultCategoryProvider.java
getOnDeviceCategory 方法，
/*** Returns a category which incorporates both GEL and bundled wallpapers.*/protected Category getOnDeviceCategory() {android.util.Log.d("luoah", "[DefaultCategoryProvider] getOnDeviceCategory");try {throw new Exception("luoah_getOnDeviceCategory");} catch (Exception e) {e.printStackTrace();}List<WallpaperInfo> onDeviceWallpapers = new ArrayList<>();if (!mPartnerProvider.shouldHideDefaultWallpaper()) {DefaultWallpaperInfo defaultWallpaperInfo = new DefaultWallpaperInfo();onDeviceWallpapers.add(defaultWallpaperInfo);}List<WallpaperInfo> partnerWallpaperInfos = PartnerWallpaperInfo.getAll(mAppContext);onDeviceWallpapers.addAll(partnerWallpaperInfos);List<WallpaperInfo> legacyPartnerWallpaperInfos = LegacyPartnerWallpaperInfo.getAll(mAppContext);onDeviceWallpapers.addAll(legacyPartnerWallpaperInfos);List<WallpaperInfo> privateWallpapers = getPrivateDeviceWallpapers();if (privateWallpapers != null) {onDeviceWallpapers.addAll(privateWallpapers);}return onDeviceWallpapers.isEmpty() ? null : new WallpaperCategory(mAppContext.getString(R.string.on_device_wallpapers_category_title),mAppContext.getString(R.string.on_device_wallpaper_collection_id),onDeviceWallpapers,PRIORITY_ON_DEVICE);}
packages/apps/WallpaperPicker2/src/com/android/wallpaper/model/PartnerWallpaperInfo.java ，
/*** @param ctx* @return All partner wallpapers found on the device.*/public static List<WallpaperInfo> getAll(Context ctx) {PartnerProvider partnerProvider = InjectorProvider.getInjector().getPartnerProvider(ctx);List<WallpaperInfo> wallpaperInfos = new ArrayList<>();final Resources partnerRes = partnerProvider.getResources();final String packageName = partnerProvider.getPackageName();if (partnerRes == null) {return wallpaperInfos;}final int resId = partnerRes.getIdentifier(PartnerProvider.LEGACY_WALLPAPER_RES_ID, "array",packageName);android.util.Log.d("luoah", "[PartnerWallpaperInfo] getAll , packageName:"+packageName+" , resId:"+resId);// Certain partner configurations don't have wallpapers provided, so need to check; return// early if they are missing.if (resId == 0) {return wallpaperInfos;}final String[] extras = partnerRes.getStringArray(resId);for (String extra : extras) {int wpResId = partnerRes.getIdentifier(extra, "drawable", packageName);android.util.Log.d("luoah", "[PartnerWallpaperInfo] getAll , wpResId:"+wpResId);if (wpResId != 0) {final int thumbRes = partnerRes.getIdentifier(extra + "_small", "drawable", packageName);if (thumbRes != 0) {final int fullRes = partnerRes.getIdentifier(extra, "drawable", packageName);android.util.Log.d("luoah", "[PartnerWallpaperInfo] extras in , thumbRes:"+thumbRes);WallpaperInfo wallpaperInfo = new PartnerWallpaperInfo(thumbRes, fullRes);wallpaperInfos.add(wallpaperInfo);}} else {Log.e("PartnerWallpaperInfo", "Couldn't find wallpaper " + extra);}}return wallpaperInfos;}
加打印，机器上 packageName 是 com.google.android.gmsintegration ， 即 vendor/partner_gms/apps/GmsSampleIntegration 。
结合源码分析，在 GmsSampleIntegration 应用里加一组数组，数组元素是壁纸图片名称，
- 添加
res/values/arrays.xml
<resources><string-array name="partner_wallpapers" translatable="false"><item>wallpaper_01</item><item>wallpaper_02</item><item>wallpaper_03</item><item>wallpaper_04</item><item>wallpaper_05</item><item>wallpaper_06</item>
</string-array>
- 在
res_dhs_full/drawable/目录放入壁纸，同时存放 *_small.jpg ,
wallpaper_01.jpg
wallpaper_01_small.jpg
wallpaper_02.jpg
wallpaper_02_small.jpg
wallpaper_03.jpg
wallpaper_03_small.jpg
wallpaper_04.jpg
wallpaper_04_small.jpg
wallpaper_05.jpg
wallpaper_05_small.jpg
wallpaper_06.jpg
wallpaper_06_small.jpg
替换后的效果，点击进去显示选择图片，选择图片后是预览页面，
