| /* |
| * Copyright (C) 2019 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.customization.model.grid; |
| |
| import android.content.ContentResolver; |
| import android.content.ContentValues; |
| import android.content.Context; |
| import android.content.res.Resources; |
| import android.database.ContentObserver; |
| import android.database.Cursor; |
| import android.net.Uri; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.view.SurfaceView; |
| |
| import androidx.annotation.Nullable; |
| import androidx.annotation.WorkerThread; |
| import androidx.lifecycle.LiveData; |
| import androidx.lifecycle.MutableLiveData; |
| |
| import com.android.customization.model.ResourceConstants; |
| import com.android.wallpaper.R; |
| import com.android.wallpaper.util.PreviewUtils; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Abstracts the logic to retrieve available grid options from the current Launcher. |
| */ |
| public class LauncherGridOptionsProvider { |
| |
| private static final String LIST_OPTIONS = "list_options"; |
| private static final String PREVIEW = "preview"; |
| private static final String DEFAULT_GRID = "default_grid"; |
| |
| private static final String COL_NAME = "name"; |
| private static final String COL_ROWS = "rows"; |
| private static final String COL_COLS = "cols"; |
| private static final String COL_PREVIEW_COUNT = "preview_count"; |
| private static final String COL_IS_DEFAULT = "is_default"; |
| |
| private static final String METADATA_KEY_PREVIEW_VERSION = "preview_version"; |
| |
| private final Context mContext; |
| private final PreviewUtils mPreviewUtils; |
| private List<GridOption> mOptions; |
| private OptionChangeLiveData mLiveData; |
| |
| public LauncherGridOptionsProvider(Context context, String authorityMetadataKey) { |
| mPreviewUtils = new PreviewUtils(context, authorityMetadataKey); |
| mContext = context; |
| } |
| |
| boolean areGridsAvailable() { |
| return mPreviewUtils.supportsPreview(); |
| } |
| |
| /** |
| * Retrieve the available grids. |
| * @param reload whether to reload grid options if they're cached. |
| */ |
| @WorkerThread |
| @Nullable |
| List<GridOption> fetch(boolean reload) { |
| if (!areGridsAvailable()) { |
| return null; |
| } |
| if (mOptions != null && !reload) { |
| return mOptions; |
| } |
| ContentResolver resolver = mContext.getContentResolver(); |
| String iconPath = mContext.getResources().getString(Resources.getSystem().getIdentifier( |
| ResourceConstants.CONFIG_ICON_MASK, "string", ResourceConstants.ANDROID_PACKAGE)); |
| try (Cursor c = resolver.query(mPreviewUtils.getUri(LIST_OPTIONS), null, null, null, |
| null)) { |
| mOptions = new ArrayList<>(); |
| while(c.moveToNext()) { |
| String name = c.getString(c.getColumnIndex(COL_NAME)); |
| int rows = c.getInt(c.getColumnIndex(COL_ROWS)); |
| int cols = c.getInt(c.getColumnIndex(COL_COLS)); |
| int previewCount = c.getInt(c.getColumnIndex(COL_PREVIEW_COUNT)); |
| boolean isSet = Boolean.parseBoolean(c.getString(c.getColumnIndex(COL_IS_DEFAULT))); |
| String title = mContext.getString(R.string.grid_title_pattern, cols, rows); |
| mOptions.add(new GridOption(title, name, isSet, rows, cols, |
| mPreviewUtils.getUri(PREVIEW), previewCount, iconPath)); |
| } |
| } catch (Exception e) { |
| mOptions = null; |
| } |
| return mOptions; |
| } |
| |
| /** |
| * Request rendering of home screen preview via Launcher to Wallpaper using SurfaceView |
| * @param name the grid option name |
| * @param bundle surface view request bundle generated from |
| * {@link com.android.wallpaper.util.SurfaceViewUtils#createSurfaceViewRequest(SurfaceView)}. |
| * @param callback To receive the result (will be called on the main thread) |
| */ |
| void renderPreview(String name, Bundle bundle, |
| PreviewUtils.WorkspacePreviewCallback callback) { |
| bundle.putString("name", name); |
| mPreviewUtils.renderPreview(bundle, callback); |
| } |
| |
| void updateView() { |
| mLiveData.postValue(new Object()); |
| } |
| |
| int applyGrid(String name) { |
| ContentValues values = new ContentValues(); |
| values.put("name", name); |
| return mContext.getContentResolver().update(mPreviewUtils.getUri(DEFAULT_GRID), values, |
| null, null); |
| } |
| |
| /** |
| * Returns an observable that receives a new value each time that the grid options are changed. |
| * Do not call if {@link #areGridsAvailable()} returns false |
| */ |
| public LiveData<Object> getOptionChangeObservable( |
| @Nullable Handler handler) { |
| if (mLiveData == null) { |
| mLiveData = new OptionChangeLiveData( |
| mContext, mPreviewUtils.getUri(DEFAULT_GRID), handler); |
| } |
| |
| return mLiveData; |
| } |
| |
| private static class OptionChangeLiveData extends MutableLiveData<Object> { |
| |
| private final ContentResolver mContentResolver; |
| private final Uri mUri; |
| private final ContentObserver mContentObserver; |
| |
| OptionChangeLiveData( |
| Context context, |
| Uri uri, |
| @Nullable Handler handler) { |
| mContentResolver = context.getContentResolver(); |
| mUri = uri; |
| mContentObserver = new ContentObserver(handler) { |
| @Override |
| public void onChange(boolean selfChange) { |
| postValue(new Object()); |
| } |
| }; |
| } |
| |
| @Override |
| protected void onActive() { |
| mContentResolver.registerContentObserver( |
| mUri, |
| /* notifyForDescendants= */ true, |
| mContentObserver); |
| } |
| |
| @Override |
| protected void onInactive() { |
| mContentResolver.unregisterContentObserver(mContentObserver); |
| } |
| } |
| } |