最近遇到一個A15系統項目，客戶要求修改鎖屏界面的默認壁紙，客戶提供了一張壁紙圖片，但是從A15系統的源代碼查看時才知道谷歌已經去掉了相關的代碼，已經不支持了，A13和A14系統好像是支持的，A15系統的WallpaperManager.java有明顯不支持的提示如下：

?所以必須采用其他的方法來實現，具體修改如下：

?1.將客戶給的鎖屏壁紙圖片拷貝到源代碼中，然后添加一行拷貝代碼將圖片拷貝到system/media/目錄下即可，如下：

2. 到packages/apps/Settings/src/com/android/settings/SettingsInitialize.java這個類文件中去修改代碼，為什么選擇在這個文件去修改呢？是因為這個SettingsInitialize.java文件是機器第一次開機進系統時會執行一次，以后的重啟或者開機都不會執行了，就不用去添加系統屬性標記位去判斷是否是第一次開機進系統，具體修改如下：

?

diff --git a/src/com/android/settings/SettingsInitialize.java b/src/com/android/settings/SettingsInitialize.java
index 4887e26940c..0b04660c95b 100644
--- a/src/com/android/settings/SettingsInitialize.java
+++ b/src/com/android/settings/SettingsInitialize.java
@@ -46,6 +46,16 @@ 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,
@@ -58,6 +68,7 @@ public class SettingsInitialize extends BroadcastReceiver {private static final String PRIMARY_PROFILE_SETTING ="com.android.settings.PRIMARY_PROFILE_CONTROLLED";private static final String WEBVIEW_IMPLEMENTATION_ACTIVITY = ".WebViewImplementation";
+    private Context mContext;@Overridepublic void onReceive(Context context, Intent broadcast) {
@@ -69,8 +80,41 @@ public class SettingsInitialize extends BroadcastReceiver {webviewSettingSetup(context, pm, userInfo);ThreadUtils.postOnBackgroundThread(() -> refreshExistingShortcuts(context));enableTwoPaneDeepLinkActivityIfNecessary(pm, context);
+
+        mContext = context;
+        mLockScreenHandler.removeCallbacks(mLockScreenRunnable);
+        mLockScreenHandler.postDelayed(mLockScreenRunnable,1);}+    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 {
+            //InputStream inputStream = new InputStream(new File("system/media/default_lock_wallpaper.png"));
+            //Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
+            Bitmap bitmap = BitmapFactory.decodeFile("system/media/default_lock_wallpaper.png");
+            //bitmap.eraseColor(0xFFBB86FC); //設置成紫色，有對應圖片的話可以設置成對應圖片
+            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) {
+
+		}
+		
+     }
+private void managedProfileSetup(Context context, final PackageManager pm, Intent broadcast,UserInfo userInfo) {if (userInfo == null || !userInfo.isManagedProfile()) {