src/com/android/wallpaper/livepicker/LiveWallpaperChange.java

/*
 * Copyright (C) 2009 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 com.android.wallpaper.livepicker;

import android.app.WallpaperInfo;
import android.app.WallpaperManager;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.os.Bundle;
import android.os.Parcelable;
import android.service.wallpaper.WallpaperService;
import android.text.TextUtils;
import android.util.Log;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;
import java.util.List;

public class LiveWallpaperChange extends LiveWallpaperPreview {
    private static final String TAG = "CHANGE_LIVE_WALLPAPER";
    private static final String KEY_ACTION_DELETE_LIVE_WALLPAPER = "action_delete_live_wallpaper";

    @Override
    protected void init() {
        Parcelable obj = getIntent().getParcelableExtra(
                WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT);
        if (obj == null || !(obj instanceof ComponentName)) {
            Log.w(TAG, "No LIVE_WALLPAPER_COMPONENT extra supplied");
            finish();
            return;
        }

        ComponentName comp = (ComponentName)obj;
        WallpaperInfo currentWallpaper = WallpaperManager.getInstance(this).getWallpaperInfo();

        // Get the information about this component.  Implemented this way
        // to not allow us to direct the caller to a service that is not a
        // live wallpaper.
        Intent queryIntent = new Intent(WallpaperService.SERVICE_INTERFACE);
        queryIntent.setPackage(comp.getPackageName());
        List<ResolveInfo> list = getPackageManager().queryIntentServices(
                queryIntent, PackageManager.GET_META_DATA);
        if (list != null) {
            for (int i=0; i<list.size(); i++) {
                ResolveInfo ri = list.get(i);
                if (ri.serviceInfo.name.equals(comp.getClassName())) {
                    WallpaperInfo info;
                    try {
                        info = new WallpaperInfo(this, ri);
                    } catch (XmlPullParserException|IOException e) {
                        Log.w(TAG, "Bad wallpaper " + ri.serviceInfo, e);
                        finish();
                        return;
                    }
                    initUI(info, getDeleteAction(ri.serviceInfo,
                        (currentWallpaper == null) ? null : currentWallpaper.getServiceInfo()));
                    return;
                }
            }
        }

        Log.w(TAG, "Not a live wallpaper: " + comp);
        finish();
    }

    @Nullable
    private String getDeleteAction(@NonNull ServiceInfo serviceInfo,
        @Nullable ServiceInfo currentService) {
        if (!isPackagePreInstalled(serviceInfo.applicationInfo)) {
            Log.d(TAG, "This wallpaper is not pre-installed: " + serviceInfo.name);
            return null;
        }

        // A currently set Live wallpaper should not be deleted.
        if (currentService != null && TextUtils.equals(serviceInfo.name, currentService.name)) {
            return null;
        }

        final Bundle metaData = serviceInfo.metaData;
        if (metaData != null) {
            return metaData.getString(KEY_ACTION_DELETE_LIVE_WALLPAPER);
        }
        return null;
    }

    private boolean isPackagePreInstalled(ApplicationInfo info) {
        if (info != null && (info.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
            return true;
        }
        return false;
    }
}