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Commit b5564892 authored by Aurélien Pomini's avatar Aurélien Pomini
Browse files

Update read wallpaper methods (U and above) 

The following methods in WallpaperManager:
  - getDrawable()
  - getDrawable(int which)
  - peekDrawable()
  - peekDrawable(int which)
  - getFastDrawable()
  - getFastDrawable(int which)
  - peekFastDrawable()
  - peekFastDrawable(int which)
  - getWallpaperFile(int which)

Have been changed in T to return the default system wallpaper data unless the caller has the internal permission READ_WALLPAPER_INTERNAL (or MANAGE_EXTERNAL_STORAGE).

The READ_WALLPAPER_INTERNAL permission has been added in the SystemUI and shell AndroidManifest.

This CL also stops returning the cached wallpaper if an app doesn't hold
the READ_WALLPAPER_INTERNAL permission.

Test: treehugger
Test: atest CtsScopedStorageDeviceOnlyTest
Test: atest ScopedStorageHostTest
Test: atest CtsAppOpsTestCases
Test: atest CtsWallpaperTestCases
Test: atest NoWallpaperPermissionsTest
Test: atest LauncherIronwoodIntegrationTests (see
HomescreenCustomizationTests#testChangeWallpaper)
Bug: 261906287
Bug: 239784307

Change-Id: I8f90fbe78668e4e1d09188196180ca39c6b760b1
parent b29ba60e

core/api/current.txt

+9 −9
Original line number Diff line number Diff line
@@ -7549,23 +7549,23 @@ package android.app { 
    method public android.content.Intent getCropAndSetWallpaperIntent(android.net.Uri);

    method public int getDesiredMinimumHeight();

    method public int getDesiredMinimumWidth();

    method @Nullable @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public android.graphics.drawable.Drawable getDrawable();

    method @Nullable @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public android.graphics.drawable.Drawable getDrawable(int);

    method @Nullable @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public android.graphics.drawable.Drawable getFastDrawable();

    method @Nullable @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public android.graphics.drawable.Drawable getFastDrawable(int);

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable getDrawable();

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable getDrawable(int);

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable getFastDrawable();

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable getFastDrawable(int);

    method public static android.app.WallpaperManager getInstance(android.content.Context);

    method @Nullable public android.app.WallpaperColors getWallpaperColors(int);

    method @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public android.os.ParcelFileDescriptor getWallpaperFile(int);

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.os.ParcelFileDescriptor getWallpaperFile(int);

    method public int getWallpaperId(int);

    method public android.app.WallpaperInfo getWallpaperInfo();

    method @Nullable public android.app.WallpaperInfo getWallpaperInfo(int);

    method public boolean hasResourceWallpaper(@RawRes int);

    method public boolean isSetWallpaperAllowed();

    method public boolean isWallpaperSupported();

    method @Nullable public android.graphics.drawable.Drawable peekDrawable();

    method @Nullable public android.graphics.drawable.Drawable peekDrawable(int);

    method @Nullable @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public android.graphics.drawable.Drawable peekFastDrawable();

    method @Nullable @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public android.graphics.drawable.Drawable peekFastDrawable(int);

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable peekDrawable();

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable peekDrawable(int);

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable peekFastDrawable();

    method @Nullable @RequiresPermission(anyOf={android.Manifest.permission.MANAGE_EXTERNAL_STORAGE, "android.permission.READ_WALLPAPER_INTERNAL"}) public android.graphics.drawable.Drawable peekFastDrawable(int);

    method public void removeOnColorsChangedListener(@NonNull android.app.WallpaperManager.OnColorsChangedListener);

    method public void sendWallpaperCommand(android.os.IBinder, String, int, int, int, android.os.Bundle);

    method @RequiresPermission(android.Manifest.permission.SET_WALLPAPER) public void setBitmap(android.graphics.Bitmap) throws java.io.IOException;

core/api/test-current.txt

+1 −1
Original line number Diff line number Diff line
@@ -473,7 +473,7 @@ package android.app { 
    method @Nullable public android.graphics.Rect peekBitmapDimensions(int);

    method public void setWallpaperZoomOut(@NonNull android.os.IBinder, float);

    method public boolean shouldEnableWideColorGamut();

    method @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE) public boolean wallpaperSupportsWcg(int);

    method public boolean wallpaperSupportsWcg(int);

  }



  public class WindowConfiguration implements java.lang.Comparable<android.app.WindowConfiguration> android.os.Parcelable {

core/java/android/app/WallpaperManager.java

+214 −14
Original line number Diff line number Diff line
@@ -16,6 +16,11 @@ 


package android.app;



import static android.Manifest.permission.MANAGE_EXTERNAL_STORAGE;

import static android.Manifest.permission.READ_WALLPAPER_INTERNAL;

import static android.content.pm.PackageManager.PERMISSION_GRANTED;

import static android.os.ParcelFileDescriptor.MODE_READ_ONLY;



import android.annotation.FloatRange;

import android.annotation.IntDef;

import android.annotation.NonNull;
@@ -28,6 +33,9 @@ import android.annotation.SystemApi; 
import android.annotation.SystemService;

import android.annotation.TestApi;

import android.annotation.UiContext;

import android.app.compat.CompatChanges;

import android.compat.annotation.ChangeId;

import android.compat.annotation.EnabledSince;

import android.compat.annotation.UnsupportedAppUsage;

import android.content.ComponentName;

import android.content.ContentResolver;
@@ -84,6 +92,7 @@ import java.io.BufferedInputStream; 
import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;
@@ -108,8 +117,26 @@ import java.util.concurrent.TimeUnit; 
 */

@SystemService(Context.WALLPAPER_SERVICE)

public class WallpaperManager {



    private static String TAG = "WallpaperManager";

    private static final boolean DEBUG = false;



    /**

     * Trying to read the wallpaper file or bitmap in T will return

     * the default wallpaper bitmap/file instead of throwing a SecurityException.

     */

    @ChangeId

    @EnabledSince(targetSdkVersion = Build.VERSION_CODES.TIRAMISU)

    static final long RETURN_DEFAULT_ON_SECURITY_EXCEPTION = 239784307L;



    /**

     * In U and later, attempting to read the wallpaper file or bitmap will throw an exception,

     * (except with the READ_WALLPAPER_INTERNAL permission).

     */

    @ChangeId

    @EnabledSince(targetSdkVersion = Build.VERSION_CODES.UPSIDE_DOWN_CAKE)

    static final long THROW_ON_SECURITY_EXCEPTION = 237508058L;



    private float mWallpaperXStep = -1;

    private float mWallpaperYStep = -1;

    private static final @NonNull RectF LOCAL_COLOR_BOUNDS =
@@ -585,7 +612,8 @@ public class WallpaperManager { 
                }

            }

            synchronized (this) {

                if (mCachedWallpaper != null && mCachedWallpaper.isValid(userId, which)) {

                if (mCachedWallpaper != null && mCachedWallpaper.isValid(userId, which) && context

                        .checkSelfPermission(READ_WALLPAPER_INTERNAL) == PERMISSION_GRANTED) {

                    return mCachedWallpaper.mCachedWallpaper;

                }

                mCachedWallpaper = null;
@@ -596,6 +624,19 @@ public class WallpaperManager { 
                } catch (OutOfMemoryError e) {

                    Log.w(TAG, "Out of memory loading the current wallpaper: " + e);

                } catch (SecurityException e) {

                    /*

                     * Apps with target SDK <= S can still access the wallpaper through

                     * READ_EXTERNAL_STORAGE. In T however, app that previously had access to the

                     * wallpaper via READ_EXTERNAL_STORAGE will get a SecurityException here.

                     * Thus, in T specifically, return the default wallpaper instead of crashing.

                     */

                    if (CompatChanges.isChangeEnabled(RETURN_DEFAULT_ON_SECURITY_EXCEPTION)

                            && !CompatChanges.isChangeEnabled(THROW_ON_SECURITY_EXCEPTION)) {

                        Log.w(TAG, "No permission to access wallpaper, returning default"

                                + " wallpaper to avoid crashing legacy app.");

                        return getDefaultWallpaper(context, FLAG_SYSTEM);

                    }



                    if (context.getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.O_MR1) {

                        Log.w(TAG, "No permission to access wallpaper, suppressing"

                                + " exception to avoid crashing legacy app.");
@@ -808,6 +849,18 @@ public class WallpaperManager { 
    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Retrieve the current system wallpaper; if

     * no wallpaper is set, the system built-in static wallpaper is returned.

     * This is returned as an
@@ -821,14 +874,28 @@ public class WallpaperManager { 
     * @return Returns a Drawable object that will draw the system wallpaper,

     *     or {@code null} if no system wallpaper exists or if the calling application

     *     is not able to access the wallpaper.

     *

     * @throws SecurityException as described in the note

     */

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable getDrawable() {

        return getDrawable(FLAG_SYSTEM);

    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Retrieve the requested wallpaper; if

     * no wallpaper is set, the requested built-in static wallpaper is returned.

     * This is returned as an
@@ -844,9 +911,11 @@ public class WallpaperManager { 
     * @return Returns a Drawable object that will draw the requested wallpaper,

     *     or {@code null} if the requested wallpaper does not exist or if the calling application

     *     is not able to access the wallpaper.

     *

     * @throws SecurityException as described in the note

     */

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable getDrawable(@SetWallpaperFlags int which) {

        final ColorManagementProxy cmProxy = getColorManagementProxy();

        Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true, which, cmProxy);
@@ -1069,6 +1138,18 @@ public class WallpaperManager { 
    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Retrieve the current system wallpaper; if there is no wallpaper set,

     * a null pointer is returned. This is returned as an

     * abstract Drawable that you can install in a View to display whatever
@@ -1076,13 +1157,28 @@ public class WallpaperManager { 
     *

     * @return Returns a Drawable object that will draw the wallpaper or a

     * null pointer if wallpaper is unset.

     *

     * @throws SecurityException as described in the note

     */

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable peekDrawable() {

        return peekDrawable(FLAG_SYSTEM);

    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Retrieve the requested wallpaper; if there is no wallpaper set,

     * a null pointer is returned. This is returned as an

     * abstract Drawable that you can install in a View to display whatever
@@ -1092,11 +1188,14 @@ public class WallpaperManager { 
     *     IllegalArgumentException if an invalid wallpaper is requested.

     * @return Returns a Drawable object that will draw the wallpaper or a null pointer if

     * wallpaper is unset.

     *

     * @throws SecurityException as described in the note

     */

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable peekDrawable(@SetWallpaperFlags int which) {

        final ColorManagementProxy cmProxy = getColorManagementProxy();

        Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, false, which, cmProxy);

        Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true, which, cmProxy);

        if (bm != null) {

            Drawable dr = new BitmapDrawable(mContext.getResources(), bm);

            dr.setDither(false);
@@ -1106,6 +1205,18 @@ public class WallpaperManager { 
    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Like {@link #getDrawable()}, but the returned Drawable has a number

     * of limitations to reduce its overhead as much as possible. It will

     * never scale the wallpaper (only centering it if the requested bounds
@@ -1117,14 +1228,28 @@ public class WallpaperManager { 
     * the same density as the screen (not in density compatibility mode).

     *

     * @return Returns a Drawable object that will draw the wallpaper.

     *

     * @throws SecurityException as described in the note

     */

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable getFastDrawable() {

        return getFastDrawable(FLAG_SYSTEM);

    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Like {@link #getDrawable(int)}, but the returned Drawable has a number

     * of limitations to reduce its overhead as much as possible. It will

     * never scale the wallpaper (only centering it if the requested bounds
@@ -1138,9 +1263,11 @@ public class WallpaperManager { 
     * @param which The {@code FLAG_*} identifier of a valid wallpaper type.  Throws

     *     IllegalArgumentException if an invalid wallpaper is requested.

     * @return Returns a Drawable object that will draw the wallpaper.

     *

     * @throws SecurityException as described in the note

     */

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable getFastDrawable(@SetWallpaperFlags int which) {

        final ColorManagementProxy cmProxy = getColorManagementProxy();

        Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true, which, cmProxy);
@@ -1151,19 +1278,45 @@ public class WallpaperManager { 
    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Like {@link #getFastDrawable()}, but if there is no wallpaper set,

     * a null pointer is returned.

     *

     * @return Returns an optimized Drawable object that will draw the

     * wallpaper or a null pointer if these is none.

     *

     * @throws SecurityException as described in the note

     */

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable peekFastDrawable() {

        return peekFastDrawable(FLAG_SYSTEM);

    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * Like {@link #getFastDrawable()}, but if there is no wallpaper set,

     * a null pointer is returned.

     *
@@ -1171,12 +1324,14 @@ public class WallpaperManager { 
     *     IllegalArgumentException if an invalid wallpaper is requested.

     * @return Returns an optimized Drawable object that will draw the

     * wallpaper or a null pointer if these is none.

     *

     * @throws SecurityException as described in the note

     */

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public Drawable peekFastDrawable(@SetWallpaperFlags int which) {

        final ColorManagementProxy cmProxy = getColorManagementProxy();

        Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, false, which, cmProxy);

        Bitmap bm = sGlobals.peekWallpaperBitmap(mContext, true, which, cmProxy);

        if (bm != null) {

            return new FastBitmapDrawable(bm);

        }
@@ -1194,7 +1349,6 @@ public class WallpaperManager { 
     * @hide

     */

    @TestApi

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    public boolean wallpaperSupportsWcg(int which) {

        if (!shouldEnableWideColorGamut()) {

            return false;
@@ -1295,6 +1449,18 @@ public class WallpaperManager { 
    }



    /**

     * <strong> Important note: </strong>

     * <ul>

     *     <li>Up to version S, this method requires the

     *     {@link android.Manifest.permission#READ_EXTERNAL_STORAGE} permission.</li>

     *     <li>Starting in T, directly accessing the wallpaper is not possible anymore,

     *     instead the default system wallpaper is returned

     *     (some versions of T may throw a {@code SecurityException}).</li>

     *     <li>From version U, this method should not be used

     *     and will always throw a @code SecurityException}.</li>

     * </ul>

     * <br>

     *

     * 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.

     *
@@ -1305,14 +1471,17 @@ public class WallpaperManager { 
     * @param which The wallpaper whose image file is to be retrieved.  Must be a single

     *     defined kind of wallpaper, either {@link #FLAG_SYSTEM} or

     *     {@link #FLAG_LOCK}.

     * @return An open, readable file desriptor to the requested wallpaper image file;

     * @return An open, readable file descriptor to the requested wallpaper image file;

     *     or {@code null} if no such wallpaper is configured or if the calling app does

     *     not have permission to read the current wallpaper.

     *

     * @see #FLAG_LOCK

     * @see #FLAG_SYSTEM

     *

     * @throws SecurityException as described in the note

     */

    @RequiresPermission(android.Manifest.permission.READ_EXTERNAL_STORAGE)

    @Nullable

    @RequiresPermission(anyOf = {MANAGE_EXTERNAL_STORAGE, READ_WALLPAPER_INTERNAL})

    public ParcelFileDescriptor getWallpaperFile(@SetWallpaperFlags int which) {

        return getWallpaperFile(which, mContext.getUserId());

    }
@@ -1475,13 +1644,18 @@ public class WallpaperManager { 
            } catch (RemoteException e) {

                throw e.rethrowFromSystemServer();

            } catch (SecurityException e) {

                if (CompatChanges.isChangeEnabled(RETURN_DEFAULT_ON_SECURITY_EXCEPTION)

                        && !CompatChanges.isChangeEnabled(THROW_ON_SECURITY_EXCEPTION)) {

                    Log.w(TAG, "No permission to access wallpaper, returning default"

                            + " wallpaper file to avoid crashing legacy app.");

                    return getDefaultSystemWallpaperFile();

                }

                if (mContext.getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.O_MR1) {

                    Log.w(TAG, "No permission to access wallpaper, suppressing"

                            + " exception to avoid crashing legacy app.");

                    return null;

                } else {

                    throw e;

                }

                throw e;

            }

        }

    }
@@ -2586,6 +2760,24 @@ public class WallpaperManager { 
        return null;

    }



    /**

     * util used in T to return a default system wallpaper file

     * when third party apps attempt to read the wallpaper with {@link #getWallpaperFile}

     */

    private static ParcelFileDescriptor getDefaultSystemWallpaperFile() {

        for (String path: getDefaultSystemWallpaperPaths()) {

            File file = new File(path);

            if (file.exists()) {

                try {

                    return ParcelFileDescriptor.open(file, MODE_READ_ONLY);

                } catch (FileNotFoundException e) {

                    // continue; default wallpaper file not found on this path

                }

            }

        }

        return null;

    }



    private static InputStream getWallpaperInputStream(String path) {

        if (!TextUtils.isEmpty(path)) {

            final File file = new File(path);
@@ -2600,6 +2792,14 @@ public class WallpaperManager { 
        return null;

    }



    /**

     * @return a list of paths to the system default wallpapers, in order of priority:

     * if the file exists for the first path of this list, the first path should be used.

     */

    private static List<String> getDefaultSystemWallpaperPaths() {

        return List.of(SystemProperties.get(PROP_WALLPAPER), getCmfWallpaperPath());

    }



    private static String getCmfWallpaperPath() {

        return Environment.getProductDirectory() + WALLPAPER_CMF_PATH + "default_wallpaper_"

                + VALUE_CMF_COLOR;

core/res/AndroidManifest.xml

+1 −2
Original line number Diff line number Diff line
@@ -4036,8 +4036,7 @@ 
        android:description="@string/permdesc_setWallpaperHints"

        android:protectionLevel="normal" />



    <!-- Allow the app to read the system wallpaper image without

        holding the READ_EXTERNAL_STORAGE permission.

    <!-- Allow the app to read the system and lock wallpaper images.

        <p>Not for use by third-party applications.

        @hide

        @SystemApi

data/etc/com.android.systemui.xml

+1 −0
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ 
        <permission name="android.permission.READ_NETWORK_USAGE_HISTORY"/>

        <permission name="android.permission.READ_PRIVILEGED_PHONE_STATE"/>

        <permission name="android.permission.READ_PRECISE_PHONE_STATE"/>

        <permission name="android.permission.READ_WALLPAPER_INTERNAL"/>

        <permission name="android.permission.REAL_GET_TASKS"/>

        <permission name="android.permission.REQUEST_NETWORK_SCORES"/>

        <permission name="android.permission.RECEIVE_MEDIA_RESOURCE_USAGE"/>