anndroid6.0锁屏壁纸

锁屏壁纸 的保存位置在/data/system/users/0 

root@**:/data/system/users/0 # ls -la
-rw-rw---- system system 73728 1970-01-14 09:26 accounts.db
-rw------- system system 8720 1970-01-14 09:26 accounts.db-journal
-rw------- system system 406 2017-03-03 18:52 appwidgets.xml
drwx------ system system 1970-01-14 09:26 fpdata
-rwx------ system system 1525422 2017-03-06 11:57 lock_wallpaper
-rw------- system system 149 2017-03-06 11:57 lock_wallpaper_info.xml
-rw------- system system 1550 2017-03-05 16:56 notificationSubscript.xml

-rw-rw---- system system 4153 2017-03-06 15:09 package-restrictions.xml
drwxrwx--x system system 1970-01-14 09:26 registered_services
-rw------- system system 16990 2017-03-06 14:06 runtime-permissions.xml
-rw------- system system 7032 2017-03-06 09:07 settings_global.xml
-rw------- system system 5090 2017-03-06 09:07 settings_secure.xml
-rw------- system system 6148 2017-03-06 15:11 settings_system.xml
-rwx------ system system 1525422 2017-03-06 11:57 wallpaper
-rw------- system system 99 2017-03-06 11:57 wallpaper_info.xml
root@**:/data/system/users/0 # pwd
/data/system/users/0

详http://blog.csdn.net/sssheiye/article/details/52052544

gallery入口选择图片设置为锁屏壁纸

方案：

1：在data/system/users/0/这个目录建立一个存放锁屏图片资源的文件lockwallpaper

2：将gallery选择的图片保存当锁屏时调用该保存的图片资源

3：将图片资源作为SystemUI中NotificationPanelView的背景

第一,二步：放在一块讲

我们知道桌面壁纸是把图片存在/data/system/users/0/wallpaper 里面，所以我们要想办法在这个目录建立一个lockwallpaper。

实现相关代码路径：

frameworks/base/core/Java/Android/app/WallpaperManager.java

frameworks/base/core/java/android/app/IWallpaperManagerCallback.aidl

frameworks/base/services/core/java/com/android/server/wallpaper/WallpaperManagerService.java

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

public class WallpaperManager {
    private static String TAG = "WallpaperManager";
    ... ...
  //{hss add for lockscreen wallpaper start
    private static final String WALLPAPERDIR = "/data/system/users/0";
    static final String LOCKWALLPAPERNAME = "lockwallpaper";

    private final Context mContext;

    <... ... ...>
    /**
     * Retrieve the current system wallpaper; if
     * no wallpaper is set, the system built-in static wallpaper is returned.
     * This is returned as an
     * abstract Drawable that you can install in a View to display whatever
     * wallpaper the user has currently set.
     *
     * @return Returns a Drawable object that will draw the wallpaper.
     */
      public Drawable getDrawable() {//获取wallpaper资源
        Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true);
        if (bm != null) {
            Drawable dr = new BitmapDrawable(mContext.getResources(), bm);
            dr.setDither(false);
            return dr;
        }
        return null;
    }

    //hss add for lockscreen wallpaper start 模仿桌面壁纸获取Drrawable资源
    public Drawable getLockScreenDrawable() {
        Bitmap bm = sGlobals.getCurrentLockScreenWallpaperLocked(mContext);
        if (bm != null) {
            Drawable dr = new BitmapDrawable(mContext.getResources(), bm);
            dr.setDither(false);
            return dr;
        }
        return null;
    }
    <... ... ...>
static class Globals extends IWallpaperManagerCallback.Stub {//内部类
        private IWallpaperManager mService;
        private Bitmap mWallpaper;
        private Bitmap mDefaultWallpaper;

        private static final int MSG_CLEAR_WALLPAPER = 1;
<pre name="code" class="java"><... ... ...>
         private Bitmap getCurrentWallpaperLocked(Context context) {//hss find 获取当前的wallpaper
            if (mService == null) {
                Log.w(TAG, "WallpaperService not running");
                return null;
            }

            try {
                Bundle params = new Bundle();
                ParcelFileDescriptor fd = mService.getWallpaper(this, params);
                if (fd != null) {
                    try {
                        BitmapFactory.Options options = new BitmapFactory.Options();
                        //M: Enable PQ support for all static wallpaper bitmap decoding
                        options.inPostProc = true;
                         options.inPostProcFlag = 1;
                        return BitmapFactory.decodeFileDescriptor(
                                fd.getFileDescriptor(), null, options);
                    } catch (OutOfMemoryError e) {
                        Log.w(TAG, "Can't decode file", e);
                    } finally {
                        try {
                            fd.close();
                        } catch (IOException e) {
                            // Ignore
                        }
                    }
                }
            } catch (RemoteException e) {
                // Ignore
            }
            return null;
        }
        //hss add for lockscreen wallpaper start  模范获取桌面壁纸协议恶搞获取当前的lockscreen wallpaper
          public Bitmap getCurrentLockScreenWallpaperLocked(Context context) {// 获取当前的lockscreen wallpaper
            if (mService == null) {
                Log.w(TAG, "WallpaperService not running");
                return null;
            }
            try {
                Bundle params = new Bundle();
                ParcelFileDescriptor fd = mService.getLockScreenWallpaper(this, params);//该方法定义在WallpaperManagerService.java
                if (fd != null) {
                    try {
                        BitmapFactory.Options options = new BitmapFactory.Options();
                        //M: Enable PQ support for all static wallpaper bitmap decoding
                        options.inPostProc = true;
                        options.inPostProcFlag = 1;
                          return BitmapFactory.decodeFileDescriptor(
                                fd.getFileDescriptor(), null, options);
                    } catch (OutOfMemoryError e) {
                        Log.w(TAG, "Can't decode file", e);
                    } finally {
                        try {
                            fd.close();
                        } catch (IOException e) {
                            // Ignore
                        }
                    }
                }
            } catch (RemoteException e) {
                // Ignore
            }
            return null;
        }
        //hss add for lockscreen wallpaper end
      }
     //这个是存设置桌面壁纸的方法，我们仿照它写一个锁屏壁纸的数据写入setLockScreenStream
public void setStream(InputStream data) throws IOException {
 if (sGlobals.mService == null) {
 Log.w(TAG, "WallpaperService not running");
return;
}
try {
ParcelFileDescriptor fd = sGlobals.mService.setWallpaper(null, mContext.getOpPackageName());
if (fd == null) {
return;
}
 FileOutputStream fos = null;
 try {
 fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd);
setWallpaper(data, fos);
 } finally {
if (fos != null) {
fos.close();
}
}
} catch (RemoteException e) { // Ignore } } //将选好的图片流写到指定路径
private void setWallpaper(InputStream data, FileOutputStream fos) throws IOException {
byte[] buffer = new byte[32768];
int amt;
while ((amt=data.read(buffer)) > 0) {
fos.write(buffer, 0, amt);
}
}

//模仿写一个设置锁屏壁纸，将图片存入到指定路径下
public void setLockScreenStream(InputStream data) throws IOException {
        if (sGlobals.mService == null) {
            return;
        }
        if(data==null)
        {   Log.w(TAG, "hss data==null");
            //模仿桌面壁纸如果图片不存在，就以默认壁纸作为锁屏壁纸来设置
            data=sGlobals.openDefaultWallpaperRes(mContext);
        }
        try {
            ParcelFileDescriptor fd = sGlobals.mService.setLockScreenWallpaper(null,
                    mContext.getOpPackageName());//该方法定义在WallpaperManagerService.java
            if (fd == null) {
                Log.w(TAG, "hss fd==null");
                return;
            }
            FileOutputStream fos = null;
            try {
                fos = new ParcelFileDescriptor.AutoCloseOutputStream(fd);
                setWallpaper(data, fos);
            } finally {
                if (fos != null) {
                    fos.close();
                }
 }
        } catch (Exception e) {
            e.printStackTrace();
        }
        Log.w(TAG, "hss wallpaperpath="+WALLPAPERDIR+"/"+LOCKWALLPAPERNAME);
    }
}

在WallpaperManager类中，我们按照桌面壁纸方法，添加了三个方法：

得到锁屏壁纸drawable    getLockScreenDrawable存壁纸资源  setLockScreenStream真正获取锁屏壁纸资源的方法   getCurrentLockScreenWallpaperLocked   。同时实际的锁屏资源的存取都是通过远程调用WallpaperManagerService.java这个service的两个方法（getLockScreenWallpaper，setLockScreenWallpaper）来实现的。所以我们需要通过aidl来实现。如下在IWallpaperManagerCallback添加两个方法，实现在WallpaperManagerService中添加：

frameworks/base/core/java/android/app/IWallpaperManagerCallback.aidl


** @hide */
interface IWallpaperManager {
    /**
     * Set the wallpaper.
     */
    ParcelFileDescriptor setWallpaper(String name, in String callingPackage);

      /**
     * Set the lockscreen wallpaper.
     */
    ParcelFileDescriptor setLockScreenWallpaper(String name, in String callingPackage);
 /**
     * Get the wallpaper.
     */
    ParcelFileDescriptor getWallpaper(IWallpaperManagerCallback cb,
            out Bundle outParams);

   /**
     * Get the lockscreen wallpaper.
     */
   ParcelFileDescriptor getLockScreenWallpaper(IWallpaperManagerCallback cb,
            out Bundle outParams);

    ... ... ...
}

在WallpaperManagerService.java中实现

frameworks/base/services/core/java/com/android/server/wallpaper/WallpaperManagerService.java

public class WallpaperManagerService extends IWallpaperManager.Stub {
    static final String TAG = "WallpaperManagerService";
    static final boolean DEBUG = true;

    final Object mLock = new Object[0];

    ... ...
    //这个是桌面壁纸获取
    public ParcelFileDescriptor getWallpaper(IWallpaperManagerCallback cb,
            Bundle outParams) {
        synchronized (mLock) {
            // This returns the current user's wallpaper, if called by a system service. Else it
            // returns the wallpaper for the calling user.
            int callingUid = Binder.getCallingUid();
            int wallpaperUserId = 0;
            if (callingUid == android.os.Process.SYSTEM_UID) {
                wallpaperUserId = mCurrentUserId;
            } else {
                wallpaperUserId = UserHandle.getUserId(callingUid);
            }
            WallpaperData wallpaper = mWallpaperMap.get(wallpaperUserId);
            if (wallpaper == null) {
                return null;
            }
            try {
                if (outParams != null) {
                    outParams.putInt("width", wallpaper.width);
                    outParams.putInt("height", wallpaper.height);
                }
                wallpaper.callbacks.register(cb);
                File f = new File(getWallpaperDir(wallpaperUserId), mWallpaperFileName);
                if (!f.exists()) {
                    return null;
                }
                return ParcelFileDescriptor.open(f, MODE_READ_ONLY);
            } catch (FileNotFoundException e) {
                /* Shouldn't happen as we check to see if the file exists */
                Slog.w(TAG, "Error getting wallpaper", e);
            }
                        return null;
        }
    }
    //add by hss for lockscreen wallpaper start 仿照桌面壁纸获取写一个获取锁屏壁纸资源
    public ParcelFileDescriptor getLockScreenWallpaper(IWallpaperManagerCallback cb,
            Bundle outParams) {
        synchronized (mLock) {
            // This returns the current user's wallpaper, if called by a system service. Else it
            // returns the wallpaper for the calling user.
            int callingUid = Binder.getCallingUid();
            int wallpaperUserId = 0;
            WallpaperData wallpaper = mWallpaperMap.get(wallpaperUserId);
            if (wallpaper == null) {
                return null;
            }
            try {
                if (outParams != null) {
                    outParams.putInt("width", wallpaper.width);
                    outParams.putInt("height", wallpaper.height);
                }
                wallpaper.callbacks.register(cb);
                File f = new File(getWallpaperDir(wallpaperUserId), LOCKWALLPAPER);
                if (!f.exists()) {
                    return null;
                }
             return ParcelFileDescriptor.open(f, MODE_READ_ONLY);
            } catch (FileNotFoundException e) {
                /* Shouldn't happen as we check to see if the file exists */
                Slog.w(TAG, "Error getting wallpaper", e);
            }
            return null;
        }
    }</span>
    //add by hss for lockscreen wallpaper end

   ... ... ...
  //这个是设置壁纸资源
   public ParcelFileDescriptor setWallpaper(String name, String callingPackage) {//hss find here for set wallpaper

        checkPermission(android.Manifest.permission.SET_WALLPAPER);
        if (!isWallpaperSupported(callingPackage)) {
            return null;
        }
        synchronized (mLock) {
            if (DEBUG) Slog.v(TAG, "setWallpaper");
            // /M: To support Smart Book @ {
            if (isSmartBookSupport()) {
                mHaveUsedSmartBook = false;
            }
            // /@ }
            int userId = UserHandle.getCallingUserId();
            WallpaperData wallpaper = getWallpaperSafeLocked(userId);
            final long ident = Binder.clearCallingIdentity();
            try {
                ParcelFileDescriptor pfd = updateWallpaperBitmapLocked(name, wallpaper);
                if (pfd != null) {
                    wallpaper.imageWallpaperPending = true;
                }
                return pfd;
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

    ParcelFileDescriptor updateWallpaperBitmapLocked(String name, WallpaperData wallpaper) {
        if (name == null) name = "null";
        try {
            File dir = getWallpaperDir(wallpaper.userId);
            if (!dir.exists()) {
                dir.mkdir();
                FileUtils.setPermissions(
                        dir.getPath(),
                        FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH,
                        -1, -1);
            }
            Slog.v(TAG, "hss dir.getPath()"+dir.getPath()+"/"+name);
            File file = new File(dir, mWallpaperFileName);
            ParcelFileDescriptor fd = ParcelFileDescriptor.open(file,
                    MODE_CREATE|MODE_READ_WRITE|MODE_TRUNCATE);
            if (!SELinux.restorecon(file)) {
                return null;
            }
            wallpaper.name = name;
            return fd;
        } catch (FileNotFoundException e) {
            Slog.w(TAG, "Error setting wallpaper", e);
        }
        return null;
    }

//hss add for lockscreenwallpaper start仿照桌面设置壁纸资源写一个设置锁屏壁纸
  public ParcelFileDescriptor setLockScreenWallpaper(String name, String callingPackage) {//hss find here for set wallpaper

        checkPermission(android.Manifest.permission.SET_WALLPAPER);
        if (!isWallpaperSupported(callingPackage)) {
            return null;
        }
        synchronized (mLock) {
            if (DEBUG) Slog.v(TAG, "setLockScreenWallpaper");
            // /M: To support Smart Book @ {
            if (isSmartBookSupport()) {
                mHaveUsedSmartBook = false;
            }
        WallpaperData wallpaper = getWallpaperSafeLocked(0);//userId
            final long ident = Binder.clearCallingIdentity();
            try {
                ParcelFileDescriptor pfd = updateLockScreenWallpaperBitmapLocked(name, wallpaper);
                if (pfd != null) {
                    wallpaper.imageWallpaperPending = true;
                }
                return pfd;
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }
    }

ParcelFileDescriptor updateLockScreenWallpaperBitmapLocked(String name, WallpaperData wallpaper) {
        if (name == null) name = "";
        try {
            File dir = getWallpaperDir(0);//wallpaper.userId
            if (!dir.exists()) {
                dir.mkdir();
                FileUtils.setPermissions(
                        dir.getPath(),
                        FileUtils.S_IRWXU|FileUtils.S_IRWXG|FileUtils.S_IXOTH,
                        -1, -1);
            }
            File file = new File(dir, LOCKWALLPAPER);
            Slog.v(TAG, "hss file.getPath()"+file.getPath());
            ParcelFileDescriptor fd = ParcelFileDescriptor.open(file,
            MODE_CREATE|MODE_READ_WRITE|MODE_TRUNCATE);
            if (!SELinux.restorecon(file)) {
                Slog.v(TAG, "hss return null");
                return null;
            }
            wallpaper.name = name;
            return fd;
        } catch (FileNotFoundException e) {
            Slog.w(TAG, "Error setting lockscreenwallpaper", e);
        }
        return null;
    }</span>
    //hss add for lockscreenwallpaper end
   ... ... ...
}

到此已经可以实现锁屏壁纸的存取了。不过由于android6.0对权限的限制，我们需要在/data/system/users/0/目录创建的lockwallpaper里面写入图片资源还要加下Linux权限

/device/mediatek/common/sepolicy/file_contexts.te

/data/system/users/[0-9]+/lockwallpaper u:object_r:wallpaper_file:s0

带三步：最后一步就是在systemui中去设置这个壁纸了，也就是NotificationPanelView的背景

public class NotificationPanelView extends PanelView implements
        ExpandableView.OnHeightChangedListener, ObservableScrollView.Listener,
        View.OnClickListener, NotificationStackScrollLayout.OnOverscrollTopChangedListener,
        KeyguardAffordanceHelper.Callback, NotificationStackScrollLayout.OnEmptySpaceClickListener,
        HeadsUpManager.OnHeadsUpChangedListener {

        ... ... ...

         public void setBarState(int statusBarState, boolean keyguardFadingAway,
            boolean goingToFullShade) {
        int oldState = mStatusBarState;
        boolean keyguardShowing = statusBarState == StatusBarState.KEYGUARD;
        setKeyguardStatusViewVisibility(statusBarState, keyguardFadingAway, goingToFullShade);
        setKeyguardBottomAreaVisibility(statusBarState, goingToFullShade);

        mStatusBarState = statusBarState;
        mKeyguardShowing = keyguardShowing;
      <span style="color:#009900;">  //hss add for lockscreen wallpaper start
            Bitmap bm = getCurrentWallpaperLocked();


            //hss add for lockscreen wallpaper end

                if (bm!=null&&(mStatusBarState == StatusBarState.SHADE_LOCKED || mStatusBarState == StatusBarState.KEYGUARD)) {
                              Log.w(TAG, "hss add for getCurrentWallpaperLocked not null...");
                   Drawable dr = new BitmapDrawable(mContext.getResources(), generateBitmap(bm, 480, 1280));
                   dr.setDither(false);
                   setBackground(dr);
               //setBackgroundResource(R.drawable.lockwallpaper);
        } else {
                        Log.w(TAG, "hss add for getCurrentWallpaperLocked null...");
            setBackgroundResource(0);
        }
        ///@}
        </span>if (goingToFullShade || (oldState == StatusBarState.KEYGUARD
                && statusBarState == StatusBarState.SHADE_LOCKED)) {
            animateKeyguardStatusBarOut();
            animateHeaderSlidingIn();
        } else if (oldState == StatusBarState.SHADE_LOCKED
       ... ... ...

     }
... ... ...
}