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      1 /*
      2  * Copyright (C) 2013 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 
     17 package com.android.documentsui;
     18 
     19 import android.app.ActivityManager;
     20 import android.app.Application;
     21 import android.content.BroadcastReceiver;
     22 import android.content.ContentProviderClient;
     23 import android.content.ContentResolver;
     24 import android.content.Context;
     25 import android.content.Intent;
     26 import android.content.IntentFilter;
     27 import android.graphics.Point;
     28 import android.net.Uri;
     29 import android.os.RemoteException;
     30 import android.text.format.DateUtils;
     31 
     32 public class DocumentsApplication extends Application {
     33     private static final long PROVIDER_ANR_TIMEOUT = 20 * DateUtils.SECOND_IN_MILLIS;
     34 
     35     private RootsCache mRoots;
     36     private Point mThumbnailsSize;
     37     private ThumbnailCache mThumbnails;
     38 
     39     public static RootsCache getRootsCache(Context context) {
     40         return ((DocumentsApplication) context.getApplicationContext()).mRoots;
     41     }
     42 
     43     public static ThumbnailCache getThumbnailsCache(Context context, Point size) {
     44         final DocumentsApplication app = (DocumentsApplication) context.getApplicationContext();
     45         final ThumbnailCache thumbnails = app.mThumbnails;
     46         if (!size.equals(app.mThumbnailsSize)) {
     47             thumbnails.evictAll();
     48             app.mThumbnailsSize = size;
     49         }
     50         return thumbnails;
     51     }
     52 
     53     public static ContentProviderClient acquireUnstableProviderOrThrow(
     54             ContentResolver resolver, String authority) throws RemoteException {
     55         final ContentProviderClient client = resolver.acquireUnstableContentProviderClient(
     56                 authority);
     57         if (client == null) {
     58             throw new RemoteException("Failed to acquire provider for " + authority);
     59         }
     60         client.setDetectNotResponding(PROVIDER_ANR_TIMEOUT);
     61         return client;
     62     }
     63 
     64     @Override
     65     public void onCreate() {
     66         final ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
     67         final int memoryClassBytes = am.getMemoryClass() * 1024 * 1024;
     68 
     69         mRoots = new RootsCache(this);
     70         mRoots.updateAsync();
     71 
     72         mThumbnails = new ThumbnailCache(memoryClassBytes / 4);
     73 
     74         final IntentFilter packageFilter = new IntentFilter();
     75         packageFilter.addAction(Intent.ACTION_PACKAGE_ADDED);
     76         packageFilter.addAction(Intent.ACTION_PACKAGE_CHANGED);
     77         packageFilter.addAction(Intent.ACTION_PACKAGE_REMOVED);
     78         packageFilter.addDataScheme("package");
     79         registerReceiver(mCacheReceiver, packageFilter);
     80 
     81         final IntentFilter localeFilter = new IntentFilter();
     82         localeFilter.addAction(Intent.ACTION_LOCALE_CHANGED);
     83         registerReceiver(mCacheReceiver, localeFilter);
     84     }
     85 
     86     @Override
     87     public void onTrimMemory(int level) {
     88         super.onTrimMemory(level);
     89 
     90         if (level >= TRIM_MEMORY_MODERATE) {
     91             mThumbnails.evictAll();
     92         } else if (level >= TRIM_MEMORY_BACKGROUND) {
     93             mThumbnails.trimToSize(mThumbnails.size() / 2);
     94         }
     95     }
     96 
     97     private BroadcastReceiver mCacheReceiver = new BroadcastReceiver() {
     98         @Override
     99         public void onReceive(Context context, Intent intent) {
    100             final Uri data = intent.getData();
    101             if (data != null) {
    102                 final String packageName = data.getSchemeSpecificPart();
    103                 mRoots.updatePackageAsync(packageName);
    104             } else {
    105                 mRoots.updateAsync();
    106             }
    107         }
    108     };
    109 }
    110