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Commit c99b83b9 authored by Malcolm Chen's avatar Malcolm Chen Committed by Xiangyu/Malcolm Chen
Browse files

Add HomeVisibilityObserver APIs in ActivityManager.

The new API will be @System which is used by Telephony stk app to
monitor foreground activity change.

Bug: 144351078
Test: manual with a test app that registers HomeVisibilityObserver
and monitor its callback.
Change-Id: I2f250cdd53a667b2d89e84e589b0ae0bc94a8aa3
parent 55e4896d
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+7 −0
Original line number Diff line number Diff line
@@ -327,10 +327,12 @@ package android.app {
    method @NonNull public java.util.Collection<java.util.Locale> getSupportedLocales();
    method @RequiresPermission(android.Manifest.permission.PACKAGE_USAGE_STATS) public int getUidImportance(int);
    method @RequiresPermission(android.Manifest.permission.KILL_UID) public void killUid(int, String);
    method public void registerHomeVisibilityObserver(@NonNull android.app.HomeVisibilityObserver);
    method @RequiresPermission(android.Manifest.permission.PACKAGE_USAGE_STATS) public void removeOnUidImportanceListener(android.app.ActivityManager.OnUidImportanceListener);
    method public void setDeviceLocales(@NonNull android.os.LocaleList);
    method @RequiresPermission(android.Manifest.permission.RESTRICTED_VR_ACCESS) public static void setPersistentVrThread(int);
    method @RequiresPermission(android.Manifest.permission.MANAGE_USERS) public boolean switchUser(@NonNull android.os.UserHandle);
    method public void unregisterHomeVisibilityObserver(@NonNull android.app.HomeVisibilityObserver);
    method @RequiresPermission(android.Manifest.permission.CHANGE_CONFIGURATION) public boolean updateMccMncConfiguration(@NonNull String, @NonNull String);
  }
@@ -579,6 +581,11 @@ package android.app {
    field public static final String ACTION_DOWNLOAD_COMPLETED = "android.intent.action.DOWNLOAD_COMPLETED";
  }
  public abstract class HomeVisibilityObserver {
    ctor public HomeVisibilityObserver();
    method public abstract void onHomeVisibilityChanged(boolean);
  }
  public abstract class InstantAppResolverService extends android.app.Service {
    ctor public InstantAppResolverService();
    method public final void attachBaseContext(android.content.Context);
+32 −0
Original line number Diff line number Diff line
@@ -78,6 +78,7 @@ import com.android.internal.os.RoSystemProperties;
import com.android.internal.os.TransferPipe;
import com.android.internal.util.FastPrintWriter;
import com.android.internal.util.MemInfoReader;
import com.android.internal.util.Preconditions;
import com.android.server.LocalServices;

import org.xmlpull.v1.XmlSerializer;
@@ -4584,4 +4585,35 @@ public class ActivityManager {
            throw e.rethrowFromSystemServer();
        }
    }

    /**
     * Register with {@link HomeVisibilityObserver} with ActivityManager.
     * @hide
     */
    @SystemApi
    public void registerHomeVisibilityObserver(@NonNull HomeVisibilityObserver observer) {
        Preconditions.checkNotNull(observer);
        try {
            observer.init(mContext, this);
            getService().registerProcessObserver(observer.mObserver);
            // Notify upon first registration.
            observer.onHomeVisibilityChanged(observer.mIsHomeActivityVisible);
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }

    /**
     * Unregister with {@link HomeVisibilityObserver} with ActivityManager.
     * @hide
     */
    @SystemApi
    public void unregisterHomeVisibilityObserver(@NonNull HomeVisibilityObserver observer) {
        Preconditions.checkNotNull(observer);
        try {
            getService().unregisterProcessObserver(observer.mObserver);
        } catch (RemoteException e) {
            throw e.rethrowFromSystemServer();
        }
    }
}
+98 −0
Original line number Diff line number Diff line
/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.app;

import android.annotation.SystemApi;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;

import java.util.List;

/**
 * An observer / callback to create and register by
 * {@link ActivityManager#registerHomeVisibilityObserver} so that it's triggered when
 * visibility of home page changes.
 * @hide
 */
@SystemApi
public abstract class HomeVisibilityObserver {
    private Context mContext;
    private ActivityManager mActivityManager;
    /** @hide */
    IProcessObserver.Stub mObserver;
    /** @hide */
    boolean mIsHomeActivityVisible;

    /** @hide */
    void init(Context context, ActivityManager activityManager) {
        mContext = context;
        mActivityManager = activityManager;
        mIsHomeActivityVisible = isHomeActivityVisible();
    }

    /**
     * The API that needs implemented and will be triggered when activity on home page changes.
     */
    public abstract void onHomeVisibilityChanged(boolean isHomeActivityVisible);

    public HomeVisibilityObserver() {
        mObserver = new IProcessObserver.Stub() {
            @Override
            public void onForegroundActivitiesChanged(int pid, int uid, boolean fg) {
                boolean isHomeActivityVisible = isHomeActivityVisible();
                if (mIsHomeActivityVisible != isHomeActivityVisible) {
                    mIsHomeActivityVisible = isHomeActivityVisible;
                    onHomeVisibilityChanged(mIsHomeActivityVisible);
                }
            }

            @Override
            public void onForegroundServicesChanged(int pid, int uid, int fgServiceTypes) {
            }

            @Override
            public void onProcessDied(int pid, int uid) {
            }
        };
    }

    private boolean isHomeActivityVisible() {
        List<ActivityManager.RunningTaskInfo> tasks = mActivityManager.getRunningTasks(1);
        if (tasks == null || tasks.isEmpty()) {
            return false;
        }

        String top = tasks.get(0).topActivity.getPackageName();
        if (top == null) {
            return false;
        }

        // We can assume that the screen is idle if the home application is in the foreground.
        final Intent intent = new Intent(Intent.ACTION_MAIN, null);
        intent.addCategory(Intent.CATEGORY_HOME);

        ResolveInfo info = mContext.getPackageManager().resolveActivity(intent,
                PackageManager.MATCH_DEFAULT_ONLY);
        if (info != null && top.equals(info.activityInfo.packageName)) {
            return true;
        }

        return false;
    }
}