默认锁屏壁纸无效问题

Android O默认锁屏壁纸无效

我们设置android默认壁纸的时候,会替换对应的资源文件,但是android O之后只能配置系统壁纸,锁屏壁纸设置为透明或设置与系统壁纸一样,如果我们要像之前一样单独配置锁屏壁纸需要修改WallpaperManager.关于Android O后面为什么不能设置锁屏壁纸,源码有下面的解释:

frameowrks/base/core/java/android/app/WallpaperManager.java

 public static InputStream openDefaultWallpaper(Context context, @SetWallpaperFlags int which) {final String whichProp;final int defaultResId;if (which == FLAG_LOCK) {/* Factory-default lock wallpapers are not yet supportedwhichProp = PROP_LOCK_WALLPAPER;defaultResId = com.android.internal.R.drawable.default_lock_wallpaper;*/return null;} else {whichProp = PROP_WALLPAPER;defaultResId = com.android.internal.R.drawable.default_wallpaper;}........return null;}

openDefaultWallpaper方法有一个参数which,它只会有两种类型FLAG_LOCK,FLAG_SYSTEM,分别代表这锁屏壁纸和桌面壁纸(桌面壁纸在SysemUI应用里面).但是源码这里有一个注解"Factory-default lock wallpapers are not yet supported",说明官方不支持设置默认锁屏壁纸,经过发现,默认锁屏就是默认桌面的壁纸,default_lock_wallpaper;是无效.

如果要实现单独配置锁屏和桌面壁纸,需要修改相关代码,在修改之前需要了解加载流程.

默认壁纸加载相关的类

以展讯8.1为例:
展讯8.1直接把默认壁纸透明话,只显示桌面壁纸.从而省略了加载锁屏壁纸的流程,提高了流畅度.所以我们需要先把这个开关打开.
frameowrks/base/package/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

private static final boolean ENABLE_LOCKSCREEN_WALLPAPER = SystemProperties.getBoolean("ro.lockwallpaper.enable", true);

加载锁屏和默认壁纸有相关的4个类

modified:   base/core/java/android/app/WallpaperManager.javamodified:   base/packages/SystemUI/src/com/android/systemui/ImageWallpaper.javamodified:   base/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockscreenWallpaper.javamodified:   base/services/core/java/com/android/server/wallpaper/WallpaperManagerService.java

功能	类,名	所属
桌面壁纸(系统壁纸加载类)	ImageWallpaper	SystemUI
锁屏壁纸加载类	LockscreenWallpaper	SystemUI
壁纸加载服务类应用进程端	ImageWallpaper	frameworks
壁纸加载服务类系统进程端	WallpaperManagerService	frameworks

加载默认壁纸是在"壁纸加载服务类应用进程端"

默认壁纸加载流程

加载默认壁纸是不会调用WallpaperManagerService,只在

在LockscreenWallpaperhe 和ImageWallpaper最终调用getBitmapAsUser如下所示

    public Bitmap getBitmap() {return getBitmapAsUser(mContext.getUserId());}/*** Like {@link #getDrawable()} but returns a Bitmap for the provided user.** @hide*/public Bitmap getBitmapAsUser(int userId) {return sGlobals.peekWallpaperBitmap(mContext, true, FLAG_SYSTEM, userId);}

在getBitmapAsUser只会传入FLAG_SYSTEM,见:peekWallpaperBitmap(mContext, true, FLAG_SYSTEM, userId);所以要在加载锁屏壁纸这个逻辑要修改(后面修改)

然后进入peekWallpaperBitmap,代码如下

        public Bitmap peekWallpaperBitmap(Context context, boolean returnDefault,@SetWallpaperFlags int which, int userId) {....if (returnDefault) {Bitmap defaultWallpaper = mDefaultWallpaper;if (defaultWallpaper == null) {
;defaultWallpaper = getDefaultWallpaper(context, which);synchronized (this) {mDefaultLockWallpaper = defaultWallpaper;}}return defaultWallpaper;}return null;}

这个只有一个mDefaultLockWallpaper,所以在保存的时候只会保存一个,因为要想锁屏壁纸和系统壁纸都有效,必须分别加载,这里也要修改.(后面修改)

最后到openDefaultWallpaper方法

    public static InputStream openDefaultWallpaper(Context context, @SetWallpaperFlags int which) {....if (which == FLAG_LOCK) {/* Factory-default lock wallpapers are not yet supported*/whichProp = PROP_LOCK_WALLPAPER;defaultResId = com.android.internal.R.drawable.default_lock_wallpaper;return null;*/} else {whichProp = PROP_WALLPAPER;defaultResId = com.android.internal.R.drawable.default_wallpaper;}final String path = SystemProperties.get(whichProp);if (!TextUtils.isEmpty(path)) {final File file = new File(path);if (file.exists()) {try {return new FileInputStream(file);} catch (IOException e) {// Ignored, fall back to platform default below}}}try {return context.getResources().openRawResource(defaultResId);} catch (NotFoundException e) {// no default defined for this device; this is not a failure}return null;}

which == FLAG_LOCK已经被注解了,需要去掉注解,去掉retrun null;(后面修改)

增加配置默认锁屏壁纸功能

step 1 :打开锁屏壁纸加载开关

SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
打开加载锁屏壁纸开关

-    private static final boolean ENABLE_LOCKSCREEN_WALLPAPER = SystemProperties.getBoolean("ro.lockwallpaper.enable", true);
+    private static final boolean ENABLE_LOCKSCREEN_WALLPAPER = true;

step 2 :修改加载锁屏壁纸方式,使得加载与系统壁纸区分

SystemUI/src/com/android/systemui/statusbar/phone/LockscreenWallpaper.java
修改LockscreenWallpaper加载方式

需要注释掉加载系统壁纸的代码,因为这里是加载锁屏壁纸
注意selectedUser有时候会null,我们只需要mCurrentUserId,selectedUser.getIdentifier()返回本身就是mCurrentUserId
getLockBitmapAsUser方法是后面添加WallpaperManager中的.

step 3 : wallpaperManager加载锁屏壁纸

base/core/java/android/app/WallpaperManager.java

上面方法是原来的加载的方法,现在只做系统壁纸加载,后面添加的方法做锁屏壁纸加载

修改:WallpaperManager内部类Globals的方法peekWallpaperBitmap

这样就能保存锁屏和系统两种不同的默认壁纸了

修改:WallpaperManager内部类Globals的方法openDefaultWallpaper

按照如上修改,系统就能分别配置锁屏和默认壁纸了

修改的patch

其他平台和android版本修改应该大同小异

下面是3个文件的修改patch

diff --git a/base/core/java/android/app/WallpaperManager.java b/base/core/java/android/app/WallpaperManager.java
index 8a375cd44..2cb77e88d 100644
--- a/base/core/java/android/app/WallpaperManager.java
+++ b/base/core/java/android/app/WallpaperManager.java
@@ -284,6 +284,7 @@ public class WallpaperManager {private Bitmap mCachedWallpaper;private int mCachedWallpaperUserId;private Bitmap mDefaultWallpaper;
+        private Bitmap mDefaultLockWallpaper;private Handler mMainLooperHandler;Globals(Looper looper) {
@@ -393,6 +394,7 @@ public class WallpaperManager {public Bitmap peekWallpaperBitmap(Context context, boolean returnDefault,@SetWallpaperFlags int which, int userId) {
+if (mService != null) {try {if (!mService.isWallpaperSupported(context.getOpPackageName())) {
@@ -427,11 +429,15 @@ public class WallpaperManager {}}if (returnDefault) {
-                Bitmap defaultWallpaper = mDefaultWallpaper;
+                Bitmap defaultWallpaper = (which == FLAG_LOCK) ? mDefaultLockWallpaper : mDefaultWallpaper;if (defaultWallpaper == null) {defaultWallpaper = getDefaultWallpaper(context, which);synchronized (this) {
-                        mDefaultWallpaper = defaultWallpaper;
+                        if(which == FLAG_LOCK) {
+                            mDefaultLockWallpaper = defaultWallpaper;
+                        } else {
+                            mDefaultWallpaper = defaultWallpaper;
+                        }}}return defaultWallpaper;
@@ -831,6 +837,17 @@ public class WallpaperManager {return sGlobals.peekWallpaperBitmap(mContext, true, FLAG_SYSTEM, userId);}+    /**
+     * Like {@link #getDrawable()} but returns a Bitmap for the provided user.
+     *
+     * @hide
+     */
+    public Bitmap getLockBitmapAsUser(int userId) {
+        Log.i("wangcan","wallpapseManager-getLockBitmapAsUser FLAG_LOCK");
+        return sGlobals.peekWallpaperBitmap(mContext, true, FLAG_LOCK, userId);
+    }
+
+/*** Get an open, readable file descriptor to the given wallpaper image file.* The caller is responsible for closing the file descriptor when done ingesting the file.
@@ -1829,11 +1846,10 @@ public class WallpaperManager {final String whichProp;final int defaultResId;if (which == FLAG_LOCK) {
-            /* Factory-default lock wallpapers are not yet supported
+            /* Factory-default lock wallpapers are not yet supported*/whichProp = PROP_LOCK_WALLPAPER;defaultResId = com.android.internal.R.drawable.default_lock_wallpaper;
-            */
-            return null;
+            //return null;} else {whichProp = PROP_WALLPAPER;defaultResId = com.android.internal.R.drawable.default_wallpaper;
diff --git a/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockscreenWallpaper.java b/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockscreenWallpaper.java
index e44a47220..25993c55b 100644
--- a/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockscreenWallpaper.java
+++ b/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/LockscreenWallpaper.java
@@ -109,10 +109,10 @@ public class LockscreenWallpaper extends IWallpaperManagerCallback.Stub implemenselectedUser != null ? selectedUser.getIdentifier() : currentUserId;ParcelFileDescriptor fd = mWallpaperManager.getWallpaperFile(WallpaperManager.FLAG_LOCK, lockWallpaperUserId);
-        if (fd == null && mBar.getPowerSaveModeInternal() == PowerManagerEx.MODE_ULTRASAVING) {
-            fd = mWallpaperManager.getWallpaperFile(
-                WallpaperManager.FLAG_SYSTEM, lockWallpaperUserId);
-        }
+        //if (fd == null && mBar.getPowerSaveModeInternal() == PowerManagerEx.MODE_ULTRASAVING) {
+        //    fd = mWallpaperManager.getWallpaperFile(
+        //        WallpaperManager.FLAG_SYSTEM, lockWallpaperUserId);
+        //}if (fd != null) {try {BitmapFactory.Options options = new BitmapFactory.Options();
@@ -128,11 +128,13 @@ public class LockscreenWallpaper extends IWallpaperManagerCallback.Stub implemenif (selectedUser != null) {// Show the selected user's static wallpaper.return LoaderResult.success(
-                        mWallpaperManager.getBitmapAsUser(selectedUser.getIdentifier()));
+                        mWallpaperManager.getLockBitmapAsUser(selectedUser.getIdentifier()));} else {// When there is no selected user, show the system wallpaper
-                return LoaderResult.success(null);
+                //return LoaderResult.success(null);
+                return LoaderResult.success(
+                        mWallpaperManager.getLockBitmapAsUser(mCurrentUserId));}}}
diff --git a/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java b/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
index 22d0bed37..b9ee91f84 100644
--- a/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
+++ b/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java
@@ -381,7 +381,7 @@ public class StatusBar extends SystemUI implements DemoMode,private static final boolean ONLY_CORE_APPS;/** If true, the lockscreen will show a distinct wallpaper */
-    private static final boolean ENABLE_LOCKSCREEN_WALLPAPER = SystemProperties.getBoolean("ro.lockwallpaper.enable", true);
+    private static final boolean ENABLE_LOCKSCREEN_WALLPAPER = true;/* If true, the device supports freeform window management.* This affects the status bar UI. */