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      1 /**
      2  * Copyright (c) 2016, 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.example.android.apis.content;
     18 
     19 import android.app.job.JobInfo;
     20 import android.app.job.JobParameters;
     21 import android.app.job.JobScheduler;
     22 import android.app.job.JobService;
     23 import android.content.ComponentName;
     24 import android.content.Context;
     25 import android.net.Uri;
     26 import android.os.Handler;
     27 import android.provider.MediaStore;
     28 import android.util.Log;
     29 import android.widget.Toast;
     30 
     31 import com.example.android.apis.R;
     32 
     33 import java.util.List;
     34 
     35 /**
     36  * Example stub job to monitor when there is a change to any media: content URI.
     37  */
     38 public class MediaContentJob extends JobService {
     39     static final Uri MEDIA_URI = Uri.parse("content://" + MediaStore.AUTHORITY + "/");
     40 
     41     final Handler mHandler = new Handler();
     42     final Runnable mWorker = new Runnable() {
     43         @Override public void run() {
     44             scheduleJob(MediaContentJob.this);
     45             jobFinished(mRunningParams, false);
     46         }
     47     };
     48 
     49     JobParameters mRunningParams;
     50 
     51     public static void scheduleJob(Context context) {
     52         JobScheduler js = context.getSystemService(JobScheduler.class);
     53         JobInfo.Builder builder = new JobInfo.Builder(JobIds.MEDIA_CONTENT_JOB,
     54                 new ComponentName(context, MediaContentJob.class));
     55         builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MEDIA_URI,
     56                 JobInfo.TriggerContentUri.FLAG_NOTIFY_FOR_DESCENDANTS));
     57         js.schedule(builder.build());
     58         Log.i("MediaContentJob", "JOB SCHEDULED!");
     59     }
     60 
     61     public static boolean isScheduled(Context context) {
     62         JobScheduler js = context.getSystemService(JobScheduler.class);
     63         List<JobInfo> jobs = js.getAllPendingJobs();
     64         if (jobs == null) {
     65             return false;
     66         }
     67         for (int i=0; i<jobs.size(); i++) {
     68             if (jobs.get(i).getId() == JobIds.MEDIA_CONTENT_JOB) {
     69                 return true;
     70             }
     71         }
     72         return false;
     73     }
     74 
     75     public static void cancelJob(Context context) {
     76         JobScheduler js = context.getSystemService(JobScheduler.class);
     77         js.cancel(JobIds.MEDIA_CONTENT_JOB);
     78     }
     79 
     80     @Override
     81     public boolean onStartJob(JobParameters params) {
     82         Log.i("MediaContentJob", "JOB STARTED!");
     83         mRunningParams = params;
     84         StringBuilder sb = new StringBuilder();
     85         sb.append("Media content has changed:\n");
     86         if (params.getTriggeredContentAuthorities() != null) {
     87             sb.append("Authorities: ");
     88             boolean first = true;
     89             for (String auth : params.getTriggeredContentAuthorities()) {
     90                 if (first) {
     91                     first = false;
     92                 } else {
     93                     sb.append(", ");
     94                 }
     95                 sb.append(auth);
     96             }
     97             if (params.getTriggeredContentUris() != null) {
     98                 for (Uri uri : params.getTriggeredContentUris()) {
     99                     sb.append("\n");
    100                     sb.append(uri);
    101                 }
    102             }
    103         } else {
    104             sb.append("(No content)");
    105         }
    106         Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show();
    107         // We will emulate taking some time to do this work, so we can see batching happen.
    108         mHandler.postDelayed(mWorker, 10*1000);
    109         return true;
    110     }
    111 
    112     @Override
    113     public boolean onStopJob(JobParameters params) {
    114         mHandler.removeCallbacks(mWorker);
    115         return false;
    116     }
    117 }
    118