前言
最近遇到一个A15系统项目，客户要求修改锁屏界面的默认壁纸，客户提供了一张壁纸图片，但是从A15系统的源代码查看时才知道谷歌已经去掉了相关的代码，已经不支持了，A13和A14系统好像是支持的，A15系统的WallpaperManager.java有明显不支持的提示如下：
frameworks/base/core/java/android/app/WallpaperManager.java
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public static InputStream openDefaultWallpaper(Context context, @SetWallpaperFlags int which) {
final String whichProp;
final int defaultResId;
/* Factory-default lock wallpapers are not yet supported.
whichProp = which == FLAG_LOCK ? PROP_LOCK_WALLPAPER : PROP_WALLPAPER;
defaultResId = which == FLAG_LOCK ? R.drawable.default_lock_wallpaper : ....
*/
whichProp = PROP_WALLPAPER;
/*
* Bug 2586784 - [AR.695.003179.010241.031295] turn off wallpaper zoomed for highrefresh
*/
if (TextUtils.isEmpty(SystemProperties.get("ro.boot.high_refresh"))) {
defaultResId = com.android.internal.R.drawable.default_wallpaper;
} else {
defaultResId = com.android.internal.R.drawable.default_wallpaper_high_refresh;
}
方案
所以必须采用其他的方法来实现，具体修改如下：
1.将客户给的锁屏壁纸图片拷贝到源代码中，然后添加一行拷贝代码将图片拷贝到system/media/目录下即可，如下：
diff --git a/device/sprd/generic_mpool/module/generic/animation/boot/default_lock_wallpaper.png
diff --git a/device/sprd/generic_mpool/module/generic/animation/boot/boot.mk b/device/sprd/generic_mpool/module/generic/animation/boot/boot.mk
index 2ad899e3477..9003189e799 100755
--- a/device/sprd/generic_mpool/module/generic/animation/boot/boot.mk
+++ b/device/sprd/generic_mpool/module/generic/animation/boot/boot.mk
@@ -2,5 +2,6 @@
ANIMATION := device/sprd/generic_mpool/module/generic/animation/boot
PRODUCT_COPY_FILES += \
$(ANIMATION)/bootanimation.zip:system/media/bootanimation.zip \
+ $(ANIMATION)/default_lock_wallpaper.png:system/media/default_lock_wallpaper.png
# $(ANIMATION)/sound.mp3:system/media/bootsound.mp3
- 到packages/apps/Settings/src/com/android/settings/SettingsInitialize.java这个类文件中去修改代码，为什么选择在这个文件去修改呢？是因为这个SettingsInitialize.java文件是机器第一次开机进系统时会执行一次，以后的重启或者开机都不会执行了，就不用去添加系统属性标记位去判断是否是第一次开机进系统，具体修改如下：
diff --git a/packages/apps/Settings/src/com/android/settings/SettingsInitialize.java b/packages/apps/Settings/src/com/android/settings/SettingsInitialize.java
index e89ae0e6b90..fe188d35f72 100755
--- a/packages/apps/Settings/src/com/android/settings/SettingsInitialize.java
+++ b/packages/apps/Settings/src/com/android/settings/SettingsInitialize.java
@@ -47,6 +47,15 @@ import com.android.settingslib.utils.ThreadUtils;
import java.util.ArrayList;
import java.util.List;
+import android.app.WallpaperManager;
+import android.graphics.Bitmap;
+import java.io.ByteArrayOutputStream;
+import java.io.ByteArrayInputStream;
+import android.os.Handler;
+import android.content.Context;
+import android.graphics.BitmapFactory;
+import java.io.IOException;
+
/**
* Listens to {@link Intent.ACTION_PRE_BOOT_COMPLETED} and {@link Intent.ACTION_USER_INITIALIZE}
* performs setup steps for a managed profile (disables the launcher icon of the Settings app,
@@ -60,6 +69,9 @@ public class SettingsInitialize extends BroadcastReceiver {
"com.android.settings.PRIMARY_PROFILE_CONTROLLED";
private static final String WEBVIEW_IMPLEMENTATION_ACTIVITY = ".WebViewImplementation";
+ // Create by yeruilai 2025-7-21 14:57:37 Change the default lock screen wallpaper
+ private Context mContext;
+
@Override
public void onReceive(Context context, Intent broadcast) {
final UserManager um = (UserManager) context.getSystemService(Context.USER_SERVICE);
@@ -77,6 +89,12 @@ public class SettingsInitialize extends BroadcastReceiver {
} catch (Exception e) {
Log.w(TAG, "Init SmartKey default failed", e);
}
+
+ // Create by yeruilai 2025-7-21 14:57:37 Change the default lock screen wallpaper
+ mContext = context;
+ mLockScreenHandler.removeCallbacks(mLockScreenRunnable);
+ mLockScreenHandler.postDelayed(mLockScreenRunnable,1);
+
}
private void managedProfileSetup(Context context, final PackageManager pm, Intent broadcast,
@@ -194,4 +212,32 @@ public class SettingsInitialize extends BroadcastReceiver {
}
}
}
+
+ /** Create by yeruilai 2025-7-21 14:57:37 Change the default lock screen wallpaper */
+ private Runnable mLockScreenRunnable = new Runnable() {
+ @Override
+ public void run() {
+ setLockScreenWallpaper();
+ }
+ };
+
+ private Handler mLockScreenHandler = new Handler();
+
+ private void setLockScreenWallpaper() {
+ WallpaperManager wallpaperManager = WallpaperManager.getInstance(mContext);
+ int FLAG_SET_LOCK = 1 << 1;
+ try {
+ Bitmap bitmap = BitmapFactory.decodeFile("system/media/default_lock_wallpaper.png");
+ ByteArrayOutputStream tmpOut = new ByteArrayOutputStream(2048);
+ if (bitmap.compress(Bitmap.CompressFormat.PNG, 100, tmpOut)) {
+ byte[] outByteArray = tmpOut.toByteArray();
+ wallpaperManager.setStream(new ByteArrayInputStream(outByteArray), null, true, FLAG_SET_LOCK);
+ }
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+
+ }
+ /**[end] Change the default lock screen wallpaper */
+
}
总结
本方案通过系统级资源注入和首次启动配置的组合方式，有效解决了A15系统移除锁屏壁纸API的问题。其核心优势在于：
- 无需修改framework层代码
- 保持系统更新兼容性
- 实现真正的出厂预置效果
