1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.wallpaper.util; 17 18 import android.content.ContentResolver; 19 import android.content.Context; 20 import android.content.Intent; 21 import android.content.pm.PackageManager; 22 import android.content.pm.ProviderInfo; 23 import android.content.pm.ResolveInfo; 24 import android.net.Uri; 25 import android.os.Bundle; 26 import android.os.Handler; 27 import android.os.Looper; 28 import android.text.TextUtils; 29 30 import java.util.concurrent.ExecutorService; 31 import java.util.concurrent.Executors; 32 33 /** Util class for wallpaper preview. */ 34 public class PreviewUtils { 35 36 private static final String PREVIEW = "preview"; 37 private static final String METHOD_GET_PREVIEW = "get_preview"; 38 private static final ExecutorService sExecutorService = Executors.newSingleThreadExecutor(); 39 40 private final Context mContext; 41 private final String mProviderAuthority; 42 private ProviderInfo mProviderInfo; 43 PreviewUtils(Context context, String authorityMetadataKey)44 public PreviewUtils(Context context, String authorityMetadataKey) { 45 mContext = context; 46 Intent homeIntent = new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME); 47 48 ResolveInfo info = context.getPackageManager().resolveActivity(homeIntent, 49 PackageManager.MATCH_DEFAULT_ONLY | PackageManager.GET_META_DATA); 50 if (info != null && info.activityInfo != null && info.activityInfo.metaData != null) { 51 mProviderAuthority = info.activityInfo.metaData.getString(authorityMetadataKey); 52 } else { 53 mProviderAuthority = null; 54 } 55 56 mProviderInfo = TextUtils.isEmpty(mProviderAuthority) ? null 57 : mContext.getPackageManager().resolveContentProvider(mProviderAuthority, 0); 58 if (mProviderInfo != null && !TextUtils.isEmpty(mProviderInfo.readPermission)) { 59 if (context.checkSelfPermission(mProviderInfo.readPermission) 60 != PackageManager.PERMISSION_GRANTED) { 61 mProviderInfo = null; 62 } 63 } 64 } 65 66 /** 67 * Render preview under the current grid option. 68 * @param bundle request options to pass on the call 69 * @param callback to receive the results, it will be called on the main thread. 70 */ renderPreview(Bundle bundle, WorkspacePreviewCallback callback)71 public void renderPreview(Bundle bundle, WorkspacePreviewCallback callback) { 72 sExecutorService.submit(() -> { 73 Bundle result = mContext.getContentResolver().call(getUri(PREVIEW), 74 METHOD_GET_PREVIEW, null, bundle); 75 new Handler(Looper.getMainLooper()).post(() -> callback.onPreviewRendered(result)); 76 }); 77 } 78 79 /** Easy way to generate a Uri with the provider info from this class. */ getUri(String path)80 public Uri getUri(String path) { 81 return new Uri.Builder() 82 .scheme(ContentResolver.SCHEME_CONTENT) 83 .authority(mProviderInfo.authority) 84 .appendPath(path) 85 .build(); 86 } 87 88 /** Return whether preview is supported. */ supportsPreview()89 public boolean supportsPreview() { 90 return mProviderInfo != null; 91 } 92 93 /** 94 * Callback for a call to the provider to render preview 95 */ 96 public interface WorkspacePreviewCallback { 97 /** 98 * Called with the result from the provider. 99 */ onPreviewRendered(Bundle resultBundle)100 void onPreviewRendered(Bundle resultBundle); 101 } 102 } 103