Add sample for observing only photos changes.

Change-Id: I954fb466fb21d73f88b1dd1bc86eac617a628073

samples/ApiDemos/AndroidManifest.xml

@@ -1275,6 +1275,9 @@
         <service android:name=".content.MediaContentJob"
                 android:permission="android.permission.BIND_JOB_SERVICE" />
 
+        <service android:name=".content.PhotosContentJob"
+                android:permission="android.permission.BIND_JOB_SERVICE" />
+
         <activity android:name=".content.InstallApk" android:label="@string/activity_install_apk"
                 android:enabled="@bool/atLeastHoneycombMR2">
             <intent-filter>

samples/ApiDemos/res/layout/media_content_observer.xml

@@ -21,13 +21,25 @@
     <LinearLayout android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="horizontal">
-        <Button android:id="@+id/schedule_job"
+        <Button android:id="@+id/schedule_media_job"
             android:layout_width="wrap_content" android:layout_height="wrap_content"
-            android:text="Schedule job">
+            android:text="Schedule media job">
         </Button>
-        <Button android:id="@+id/cancel_job"
+        <Button android:id="@+id/cancel_media_job"
             android:layout_width="wrap_content" android:layout_height="wrap_content"
-            android:text="Cancel job">
+            android:text="Cancel media job">
+        </Button>
+    </LinearLayout>
+    <LinearLayout android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+        <Button android:id="@+id/schedule_photos_job"
+            android:layout_width="wrap_content" android:layout_height="wrap_content"
+            android:text="Schedule photos job">
+        </Button>
+        <Button android:id="@+id/cancel_photos_job"
+            android:layout_width="wrap_content" android:layout_height="wrap_content"
+            android:text="Cancel photos job">
         </Button>
     </LinearLayout>
 

samples/ApiDemos/src/com/example/android/apis/content/MediaContentJob.java

@@ -25,6 +25,7 @@ import android.content.Context;
 import android.net.Uri;
 import android.os.Handler;
 import android.provider.MediaStore;
+import android.util.Log;
 import android.widget.Toast;
 
 import com.example.android.apis.R;
@@ -49,11 +50,12 @@ public class MediaContentJob extends JobService {
 
     public static void scheduleJob(Context context) {
         JobScheduler js = context.getSystemService(JobScheduler.class);
-        JobInfo.Builder builder = new JobInfo.Builder(R.id.schedule_job,
+        JobInfo.Builder builder = new JobInfo.Builder(R.id.schedule_media_job,
                 new ComponentName(context, MediaContentJob.class));
         builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MEDIA_URI,
                 JobInfo.TriggerContentUri.FLAG_NOTIFY_FOR_DESCENDANTS));
         js.schedule(builder.build());
+        Log.i("MediaContentJob", "JOB SCHEDULED!");
     }
 
     public static boolean isScheduled(Context context) {
@@ -63,7 +65,7 @@ public class MediaContentJob extends JobService {
             return false;
         }
         for (int i=0; i<jobs.size(); i++) {
-            if (jobs.get(i).getId() == R.id.schedule_job) {
+            if (jobs.get(i).getId() == R.id.schedule_media_job) {
                 return true;
             }
         }
@@ -72,11 +74,12 @@ public class MediaContentJob extends JobService {
 
     public static void cancelJob(Context context) {
         JobScheduler js = context.getSystemService(JobScheduler.class);
-        js.cancel(R.id.schedule_job);
+        js.cancel(R.id.schedule_media_job);
     }
 
     @Override
     public boolean onStartJob(JobParameters params) {
+        Log.i("MediaContentJob", "JOB STARTED!");
         mRunningParams = params;
         StringBuilder sb = new StringBuilder();
         sb.append("Media content has changed:\n");
@@ -102,7 +105,7 @@ public class MediaContentJob extends JobService {
         }
         Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show();
         // We will emulate taking some time to do this work, so we can see batching happen.
-        mHandler.postDelayed(mWorker, 20*1000);
+        mHandler.postDelayed(mWorker, 10*1000);
         return true;
     }
 

samples/ApiDemos/src/com/example/android/apis/content/MediaContentObserver.java

@@ -29,8 +29,10 @@ import com.example.android.apis.R;
 
 public class MediaContentObserver extends Activity {
     ContentObserver mContentObserver;
-    View mScheduleJob;
+    View mScheduleMediaJob;
-    View mCancelJob;
+    View mCancelMediaJob;
+    View mSchedulePhotosJob;
+    View mCancelPhotosJob;
     TextView mDataText;
 
     @Override
@@ -49,24 +51,40 @@ public class MediaContentObserver extends Activity {
         // See res/any/layout/resources.xml for this view layout definition.
         setContentView(R.layout.media_content_observer);
 
-        mScheduleJob = findViewById(R.id.schedule_job);
+        mScheduleMediaJob = findViewById(R.id.schedule_media_job);
-        mCancelJob = findViewById(R.id.cancel_job);
+        mCancelMediaJob = findViewById(R.id.cancel_media_job);
+        mSchedulePhotosJob = findViewById(R.id.schedule_photos_job);
+        mCancelPhotosJob = findViewById(R.id.cancel_photos_job);
         mDataText = (TextView)findViewById(R.id.changes_text);
 
-        mScheduleJob.setOnClickListener(new View.OnClickListener() {
+        mScheduleMediaJob.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 MediaContentJob.scheduleJob(MediaContentObserver.this);
                 updateButtons();
             }
         });
-        mCancelJob.setOnClickListener(new View.OnClickListener() {
+        mCancelMediaJob.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 MediaContentJob.cancelJob(MediaContentObserver.this);
                 updateButtons();
             }
         });
+        mSchedulePhotosJob.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                PhotosContentJob.scheduleJob(MediaContentObserver.this);
+                updateButtons();
+            }
+        });
+        mCancelPhotosJob.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                PhotosContentJob.cancelJob(MediaContentObserver.this);
+                updateButtons();
+            }
+        });
         updateButtons();
 
         getContentResolver().registerContentObserver(MediaContentJob.MEDIA_URI, true,
@@ -75,11 +93,18 @@ public class MediaContentObserver extends Activity {
 
     void updateButtons() {
         if (MediaContentJob.isScheduled(this)) {
-            mScheduleJob.setEnabled(false);
+            mScheduleMediaJob.setEnabled(false);
-            mCancelJob.setEnabled(true);
+            mCancelMediaJob.setEnabled(true);
         } else {
-            mScheduleJob.setEnabled(true);
+            mScheduleMediaJob.setEnabled(true);
-            mCancelJob.setEnabled(false);
+            mCancelMediaJob.setEnabled(false);
+        }
+        if (PhotosContentJob.isScheduled(this)) {
+            mSchedulePhotosJob.setEnabled(false);
+            mCancelPhotosJob.setEnabled(true);
+        } else {
+            mSchedulePhotosJob.setEnabled(true);
+            mCancelPhotosJob.setEnabled(false);
         }
     }
 

samples/ApiDemos/src/com/example/android/apis/content/PhotosContentJob.java

@@ -0,0 +1,116 @@
+/**
+ * Copyright (c) 2016, 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.example.android.apis.content;
+
+import android.app.job.JobInfo;
+import android.app.job.JobParameters;
+import android.app.job.JobScheduler;
+import android.app.job.JobService;
+import android.content.ComponentName;
+import android.content.Context;
+import android.net.Uri;
+import android.os.Handler;
+import android.provider.MediaStore;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.example.android.apis.R;
+
+import java.util.List;
+
+/**
+ * Stub job to execute when there is a change to photos in the media provider.
+ */
+public class PhotosContentJob extends JobService {
+    final Handler mHandler = new Handler();
+    final Runnable mWorker = new Runnable() {
+        @Override public void run() {
+            scheduleJob(PhotosContentJob.this);
+            jobFinished(mRunningParams, false);
+        }
+    };
+
+    JobParameters mRunningParams;
+
+    public static void scheduleJob(Context context) {
+        JobScheduler js = context.getSystemService(JobScheduler.class);
+        JobInfo.Builder builder = new JobInfo.Builder(R.id.schedule_photos_job,
+                new ComponentName(context, PhotosContentJob.class));
+        builder.addTriggerContentUri(new JobInfo.TriggerContentUri(
+                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
+                JobInfo.TriggerContentUri.FLAG_NOTIFY_FOR_DESCENDANTS));
+        js.schedule(builder.build());
+        Log.i("PhotosContentJob", "JOB SCHEDULED!");
+    }
+
+    public static boolean isScheduled(Context context) {
+        JobScheduler js = context.getSystemService(JobScheduler.class);
+        List<JobInfo> jobs = js.getAllPendingJobs();
+        if (jobs == null) {
+            return false;
+        }
+        for (int i=0; i<jobs.size(); i++) {
+            if (jobs.get(i).getId() == R.id.schedule_photos_job) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public static void cancelJob(Context context) {
+        JobScheduler js = context.getSystemService(JobScheduler.class);
+        js.cancel(R.id.schedule_photos_job);
+    }
+
+    @Override
+    public boolean onStartJob(JobParameters params) {
+        Log.i("PhotosContentJob", "JOB STARTED!");
+        mRunningParams = params;
+        StringBuilder sb = new StringBuilder();
+        sb.append("Photos content has changed:\n");
+        if (params.getTriggeredContentAuthorities() != null) {
+            sb.append("Authorities: ");
+            boolean first = true;
+            for (String auth : params.getTriggeredContentAuthorities()) {
+                if (first) {
+                    first = false;
+                } else {
+                    sb.append(", ");
+                }
+                sb.append(auth);
+            }
+            if (params.getTriggeredContentUris() != null) {
+                for (Uri uri : params.getTriggeredContentUris()) {
+                    sb.append("\n");
+                    sb.append(uri);
+                }
+            }
+        } else {
+            sb.append("(No content)");
+        }
+        Toast.makeText(this, sb.toString(), Toast.LENGTH_LONG).show();
+        // We will emulate taking some time to do this work, so we can see batching happen.
+        mHandler.postDelayed(mWorker, 10*1000);
+        return true;
+    }
+
+    @Override
+    public boolean onStopJob(JobParameters params) {
+        mHandler.removeCallbacks(mWorker);
+        return false;
+    }
+}