Home | History | Annotate | Download | only in content 
      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.Manifest;
     20 import android.app.Activity;
     21 import android.content.pm.PackageManager;
     22 import android.database.ContentObserver;
     23 import android.net.Uri;
     24 import android.os.Bundle;
     25 import android.os.Handler;
     26 import android.util.Log;
     27 import android.view.View;
     28 import android.widget.TextView;
     29 
     30 import com.example.android.apis.R;
     31 
     32 public class MediaContentObserver extends Activity {
     33     public static final int REQ_PHOTOS_PERM = 1;
     34 
     35     ContentObserver mContentObserver;
     36     View mScheduleMediaJob;
     37     View mCancelMediaJob;
     38     View mSchedulePhotosJob;
     39     View mCancelPhotosJob;
     40     TextView mDataText;
     41 
     42     @Override
     43     protected void onCreate(Bundle savedInstanceState) {
     44         super.onCreate(savedInstanceState);
     45 
     46         mContentObserver = new ContentObserver(new Handler()) {
     47             public void onChange(boolean selfChange, Uri uri) {
     48                 mDataText.append(uri.toString());
     49                 mDataText.append("\n");
     50             }
     51         };
     52 
     53         Log.d("foo", "Observing: " + MediaContentJob.MEDIA_URI);
     54 
     55         // See res/any/layout/resources.xml for this view layout definition.
     56         setContentView(R.layout.media_content_observer);
     57 
     58         mScheduleMediaJob = findViewById(R.id.schedule_media_job);
     59         mCancelMediaJob = findViewById(R.id.cancel_media_job);
     60         mSchedulePhotosJob = findViewById(R.id.schedule_photos_job);
     61         mCancelPhotosJob = findViewById(R.id.cancel_photos_job);
     62         mDataText = (TextView)findViewById(R.id.changes_text);
     63 
     64         mScheduleMediaJob.setOnClickListener(new View.OnClickListener() {
     65             @Override
     66             public void onClick(View v) {
     67                 MediaContentJob.scheduleJob(MediaContentObserver.this);
     68                 updateButtons();
     69             }
     70         });
     71         mCancelMediaJob.setOnClickListener(new View.OnClickListener() {
     72             @Override
     73             public void onClick(View v) {
     74                 MediaContentJob.cancelJob(MediaContentObserver.this);
     75                 updateButtons();
     76             }
     77         });
     78         mSchedulePhotosJob.setOnClickListener(new View.OnClickListener() {
     79             @Override
     80             public void onClick(View v) {
     81                 if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
     82                         != PackageManager.PERMISSION_GRANTED) {
     83                     requestPermissions(new String[] { Manifest.permission.READ_EXTERNAL_STORAGE },
     84                             REQ_PHOTOS_PERM);
     85                 } else {
     86                     PhotosContentJob.scheduleJob(MediaContentObserver.this);
     87                     updateButtons();
     88                 }
     89             }
     90         });
     91         mCancelPhotosJob.setOnClickListener(new View.OnClickListener() {
     92             @Override
     93             public void onClick(View v) {
     94                 PhotosContentJob.cancelJob(MediaContentObserver.this);
     95                 updateButtons();
     96             }
     97         });
     98         updateButtons();
     99 
    100         getContentResolver().registerContentObserver(MediaContentJob.MEDIA_URI, true,
    101                 mContentObserver);
    102     }
    103 
    104     @Override
    105     public void onRequestPermissionsResult(int requestCode, String[] permissions,
    106             int[] grantResults) {
    107         if (requestCode == REQ_PHOTOS_PERM) {
    108             if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
    109                 PhotosContentJob.scheduleJob(MediaContentObserver.this);
    110                 updateButtons();
    111             }
    112         }
    113     }
    114 
    115     void updateButtons() {
    116         if (MediaContentJob.isScheduled(this)) {
    117             mScheduleMediaJob.setEnabled(false);
    118             mCancelMediaJob.setEnabled(true);
    119         } else {
    120             mScheduleMediaJob.setEnabled(true);
    121             mCancelMediaJob.setEnabled(false);
    122         }
    123         if (PhotosContentJob.isScheduled(this)) {
    124             mSchedulePhotosJob.setEnabled(false);
    125             mCancelPhotosJob.setEnabled(true);
    126         } else {
    127             mSchedulePhotosJob.setEnabled(true);
    128             mCancelPhotosJob.setEnabled(false);
    129         }
    130     }
    131 
    132     @Override
    133     protected void onDestroy() {
    134         super.onDestroy();
    135         getContentResolver().unregisterContentObserver(mContentObserver);
    136     }
    137 
    138 }
    139