Android获取后台应用的快照

Android 通过反射获取后台应用的快照

都在代码里了，如果无效注意反射要判断sdk版本

/**
 * 获取应用快照
 */
public class SnapShotUtil {

    @RequiresApi(api = Build.VERSION_CODES.Q)
    public static Bitmap getTargetTaskShot(Activity activity, String pkgName) {
        PackageManager packageManager = activity.getPackageManager();
        ActivityManager activityManager = (ActivityManager) activity.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RecentTaskInfo> recentTasks = activityManager.getRecentTasks(100, 1);
        for (ActivityManager.RecentTaskInfo recentTaskInfo : recentTasks) {
            ResolveInfo resolveActivity =
                    packageManager.resolveActivity(recentTaskInfo.baseIntent, 0);
            if (resolveActivity == null || resolveActivity.activityInfo == null) {
                continue;
            }
            String str = resolveActivity.activityInfo.packageName;
            if (!Objects.equals(str, pkgName)) {
                continue;
            }
            try {
                Object activityTaskManagerService = getActivityTaskManagerService();
                Object taskSnapshot = getTaskSnapshot(activityTaskManagerService, recentTaskInfo);
                Object snapshot = getSnapshot(taskSnapshot);
                Object hardwareBuffer = getHardwareBuffer(snapshot);
                Object colorSpace = getColorSpace(taskSnapshot);
                return Bitmap.wrapHardwareBuffer((HardwareBuffer) hardwareBuffer, (ColorSpace) colorSpace);
            } catch (ClassNotFoundException | NoSuchMethodException | InvocationTargetException |
                     IllegalAccessException | NoSuchFieldException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    @SuppressLint("PrivateApi")
    private static Object getActivityTaskManagerService() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        Class<?> clazz = Class.forName("android.app.ActivityTaskManager");
        Method getServiceMethod = clazz.getMethod("getService");
        getServiceMethod.setAccessible(true);
        return getServiceMethod.invoke(null);
    }

    @RequiresApi(api = Build.VERSION_CODES.Q)
    private static Object getTaskSnapshot(Object object, ActivityManager.RecentTaskInfo recentTaskInfo) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        Class<?> clazz = object.getClass();
        Method getTaskSnapshotMethod = clazz.getMethod("getTaskSnapshot", int.class, boolean.class);
        getTaskSnapshotMethod.setAccessible(true);
        return getTaskSnapshotMethod.invoke(object, recentTaskInfo.taskId, true);
    }

    private static Object getSnapshot(Object taskSnapshot) throws NoSuchFieldException, IllegalAccessException {
        Class<?> clazz = taskSnapshot.getClass();
        Field mSnapshotField = clazz.getDeclaredField("mSnapshot");
        mSnapshotField.setAccessible(true);
        return mSnapshotField.get(taskSnapshot);
    }

    private static Object getColorSpace(Object taskSnapshot) throws NoSuchFieldException, IllegalAccessException {
        Class<?> clazz = taskSnapshot.getClass();
        Field mColorSpaceField = clazz.getDeclaredField("mColorSpace");
        mColorSpaceField.setAccessible(true);
        return mColorSpaceField.get(taskSnapshot);
    }

    private static Object getHardwareBuffer(Object graphicBuffer) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        Class<?> clazz = HardwareBuffer.class;
        Method createFromGraphicBufferMethod = clazz.getMethod("createFromGraphicBuffer", graphicBuffer.getClass());
        return createFromGraphicBufferMethod.invoke(null, graphicBuffer);
    }