src/com/android/contacts/voicemail/VoicemailPlaybackFragment.java - platform/packages/apps/Contacts - Git at Google

 /*
  * Copyright (C) 2011 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.android.contacts.voicemail;

 import static com.android.contacts.CallDetailActivity.EXTRA_VOICEMAIL_START_PLAYBACK;
 import static com.android.contacts.CallDetailActivity.EXTRA_VOICEMAIL_URI;

 import com.android.common.io.MoreCloseables;
 import com.android.contacts.ProximitySensorAware;
 import com.android.contacts.R;
 import com.android.contacts.util.AsyncTaskExecutors;
 import com.android.ex.variablespeed.MediaPlayerProxy;
 import com.android.ex.variablespeed.VariableSpeed;
 import com.google.common.base.Preconditions;

 import android.app.Activity;
 import android.app.Fragment;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.database.ContentObserver;
 import android.database.Cursor;
 import android.media.AudioManager;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.PowerManager;
 import android.provider.VoicemailContract;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageButton;
 import android.widget.SeekBar;
 import android.widget.TextView;

 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;

 import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.NotThreadSafe;

 /**
  * Displays and plays back a single voicemail.
  * <p>
  * When the Activity containing this Fragment is created, voicemail playback
  * will begin immediately. The Activity is expected to be started via an intent
  * containing a suitable voicemail uri to playback.
  * <p>
  * This class is not thread-safe, it is thread-confined. All calls to all public
  * methods on this class are expected to come from the main ui thread.
  */
 @NotThreadSafe
 public class VoicemailPlaybackFragment extends Fragment {
     private static final String TAG = "VoicemailPlayback";
     private static final int NUMBER_OF_THREADS_IN_POOL = 2;
     private static final String[] HAS_CONTENT_PROJECTION = new String[] {
         VoicemailContract.Voicemails.HAS_CONTENT,
     };

     private VoicemailPlaybackPresenter mPresenter;
     private ScheduledExecutorService mScheduledExecutorService;
     private View mPlaybackLayout;

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         mPlaybackLayout = inflater.inflate(R.layout.playback_layout, null);
         return mPlaybackLayout;
     }

     @Override
     public void onActivityCreated(Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
         mScheduledExecutorService = createScheduledExecutorService();
         Bundle arguments = getArguments();
         Preconditions.checkNotNull(arguments, "fragment must be started with arguments");
         Uri voicemailUri = arguments.getParcelable(EXTRA_VOICEMAIL_URI);
         Preconditions.checkNotNull(voicemailUri, "fragment must contain EXTRA_VOICEMAIL_URI");
         boolean startPlayback = arguments.getBoolean(EXTRA_VOICEMAIL_START_PLAYBACK, false);
         PowerManager powerManager =
                 (PowerManager) getActivity().getSystemService(Context.POWER_SERVICE);
         PowerManager.WakeLock wakeLock =
                 powerManager.newWakeLock(
                         PowerManager.SCREEN_DIM_WAKE_LOCK, getClass().getSimpleName());
         mPresenter = new VoicemailPlaybackPresenter(createPlaybackViewImpl(),
                 createMediaPlayer(mScheduledExecutorService), voicemailUri,
                 mScheduledExecutorService, startPlayback,
                 AsyncTaskExecutors.createAsyncTaskExecutor(), wakeLock);
         mPresenter.onCreate(savedInstanceState);
     }

     @Override
     public void onSaveInstanceState(Bundle outState) {
         mPresenter.onSaveInstanceState(outState);
         super.onSaveInstanceState(outState);
     }

     @Override
     public void onDestroy() {
         mPresenter.onDestroy();
         mScheduledExecutorService.shutdown();
         super.onDestroy();
     }

     @Override
     public void onPause() {
         mPresenter.onPause();
         super.onPause();
     }

     private PlaybackViewImpl createPlaybackViewImpl() {
         return new PlaybackViewImpl(new ActivityReference(), getActivity().getApplicationContext(),
                 mPlaybackLayout);
     }

     private MediaPlayerProxy createMediaPlayer(ExecutorService executorService) {
         return VariableSpeed.createVariableSpeed(executorService);
     }

     private ScheduledExecutorService createScheduledExecutorService() {
         return Executors.newScheduledThreadPool(NUMBER_OF_THREADS_IN_POOL);
     }

     /**
      * Formats a number of milliseconds as something that looks like {@code 00:05}.
      * <p>
      * We always use four digits, two for minutes two for seconds.  In the very unlikely event
      * that the voicemail duration exceeds 99 minutes, the display is capped at 99 minutes.
      */
     private static String formatAsMinutesAndSeconds(int millis) {
         int seconds = millis / 1000;
         int minutes = seconds / 60;
         seconds -= minutes * 60;
         if (minutes > 99) {
             minutes = 99;
         }
         return String.format("%02d:%02d", minutes, seconds);
     }

     /**
      * An object that can provide us with an Activity.
      * <p>
      * Fragments suffer the drawback that the Activity they belong to may sometimes be null. This
      * can happen if the Fragment is detached, for example. In that situation a call to
      * {@link Fragment#getString(int)} will throw and {@link IllegalStateException}. Also, calling
      * {@link Fragment#getActivity()} is dangerous - it may sometimes return null. And thus blindly
      * calling a method on the result of getActivity() is dangerous too.
      * <p>
      * To work around this, I have made the {@link PlaybackViewImpl} class static, so that it does
      * not have access to any Fragment methods directly. Instead it uses an application Context for
      * things like accessing strings, accessing system services. It only uses the Activity when it
      * absolutely needs it - and does so through this class. This makes it easy to see where we have
      * to check for null properly.
      */
     private final class ActivityReference {
         /** Gets this Fragment's Activity: <b>may be null</b>. */
         public final Activity get() {
             return getActivity();
         }
     }

     /**  Methods required by the PlaybackView for the VoicemailPlaybackPresenter. */
     private static final class PlaybackViewImpl implements VoicemailPlaybackPresenter.PlaybackView {
         private final ActivityReference mActivityReference;
         private final Context mApplicationContext;
         private final SeekBar mPlaybackSeek;
         private final ImageButton mStartStopButton;
         private final ImageButton mPlaybackSpeakerphone;
         private final ImageButton mRateDecreaseButton;
         private final ImageButton mRateIncreaseButton;
         private final TextViewWithMessagesController mTextController;

         public PlaybackViewImpl(ActivityReference activityReference, Context applicationContext,
                 View playbackLayout) {
             Preconditions.checkNotNull(activityReference);
             Preconditions.checkNotNull(applicationContext);
             Preconditions.checkNotNull(playbackLayout);
             mActivityReference = activityReference;
             mApplicationContext = applicationContext;
             mPlaybackSeek = (SeekBar) playbackLayout.findViewById(R.id.playback_seek);
             mStartStopButton = (ImageButton) playbackLayout.findViewById(
                     R.id.playback_start_stop);
             mPlaybackSpeakerphone = (ImageButton) playbackLayout.findViewById(
                     R.id.playback_speakerphone);
             mRateDecreaseButton = (ImageButton) playbackLayout.findViewById(
                     R.id.rate_decrease_button);
             mRateIncreaseButton = (ImageButton) playbackLayout.findViewById(
                     R.id.rate_increase_button);
             mTextController = new TextViewWithMessagesController(
                     (TextView) playbackLayout.findViewById(R.id.playback_position_text),
                     (TextView) playbackLayout.findViewById(R.id.playback_speed_text));
         }

         @Override
         public void finish() {
             Activity activity = mActivityReference.get();
             if (activity != null) {
                 activity.finish();
             }
         }

         @Override
         public void runOnUiThread(Runnable runnable) {
             Activity activity = mActivityReference.get();
             if (activity != null) {
                 activity.runOnUiThread(runnable);
             }
         }

         @Override
         public Context getDataSourceContext() {
             return mApplicationContext;
         }

         @Override
         public void setRateDecreaseButtonListener(View.OnClickListener listener) {
             mRateDecreaseButton.setOnClickListener(listener);
         }

         @Override
         public void setRateIncreaseButtonListener(View.OnClickListener listener) {
             mRateIncreaseButton.setOnClickListener(listener);
         }

         @Override
         public void setStartStopListener(View.OnClickListener listener) {
             mStartStopButton.setOnClickListener(listener);
         }

         @Override
         public void setSpeakerphoneListener(View.OnClickListener listener) {
             mPlaybackSpeakerphone.setOnClickListener(listener);
         }

         @Override
         public void setRateDisplay(float rate, int stringResourceId) {
             mTextController.setTemporaryText(
                     mApplicationContext.getString(stringResourceId), 1, TimeUnit.SECONDS);
         }

         @Override
         public void setPositionSeekListener(SeekBar.OnSeekBarChangeListener listener) {
             mPlaybackSeek.setOnSeekBarChangeListener(listener);
         }

         @Override
         public void playbackStarted() {
             mStartStopButton.setImageResource(R.drawable.ic_hold_pause_holo_dark);
         }

         @Override
         public void playbackStopped() {
             mStartStopButton.setImageResource(R.drawable.ic_play);
         }

         @Override
         public void enableProximitySensor() {
             // Only change the state if the activity is still around.
             Activity activity = mActivityReference.get();
             if (activity != null && activity instanceof ProximitySensorAware) {
                 ((ProximitySensorAware) activity).enableProximitySensor();
             }
         }

         @Override
         public void disableProximitySensor() {
             // Only change the state if the activity is still around.
             Activity activity = mActivityReference.get();
             if (activity != null && activity instanceof ProximitySensorAware) {
                 ((ProximitySensorAware) activity).disableProximitySensor(true);
             }
         }

         @Override
         public void registerContentObserver(Uri uri, ContentObserver observer) {
             mApplicationContext.getContentResolver().registerContentObserver(uri, false, observer);
         }

         @Override
         public void unregisterContentObserver(ContentObserver observer) {
             mApplicationContext.getContentResolver().unregisterContentObserver(observer);
         }

         @Override
         public void setClipPosition(int clipPositionInMillis, int clipLengthInMillis) {
             int seekBarPosition = Math.max(0, clipPositionInMillis);
             int seekBarMax = Math.max(seekBarPosition, clipLengthInMillis);
             if (mPlaybackSeek.getMax() != seekBarMax) {
                 mPlaybackSeek.setMax(seekBarMax);
             }
             mPlaybackSeek.setProgress(seekBarPosition);
             mTextController.setPermanentText(
                     formatAsMinutesAndSeconds(seekBarMax - seekBarPosition));
         }

         private String getString(int resId) {
             return mApplicationContext.getString(resId);
         }

         @Override
         public void setIsBuffering() {
             disableUiElements();
             mTextController.setPermanentText(getString(R.string.voicemail_buffering));
         }

         @Override
         public void setIsFetchingContent() {
             disableUiElements();
             mTextController.setPermanentText(getString(R.string.voicemail_fetching_content));
         }

         @Override
         public void setFetchContentTimeout() {
             disableUiElements();
             mTextController.setPermanentText(getString(R.string.voicemail_fetching_timout));
         }

         @Override
         public int getDesiredClipPosition() {
             return mPlaybackSeek.getProgress();
         }

         @Override
         public void disableUiElements() {
             mRateIncreaseButton.setEnabled(false);
             mRateDecreaseButton.setEnabled(false);
             mStartStopButton.setEnabled(false);
             mPlaybackSpeakerphone.setEnabled(false);
             mPlaybackSeek.setProgress(0);
             mPlaybackSeek.setEnabled(false);
         }

         @Override
         public void playbackError(Exception e) {
             disableUiElements();
             mTextController.setPermanentText(getString(R.string.voicemail_playback_error));
             Log.e(TAG, "Could not play voicemail", e);
         }

         @Override
         public void enableUiElements() {
             mRateIncreaseButton.setEnabled(true);
             mRateDecreaseButton.setEnabled(true);
             mStartStopButton.setEnabled(true);
             mPlaybackSpeakerphone.setEnabled(true);
             mPlaybackSeek.setEnabled(true);
         }

         @Override
         public void sendFetchVoicemailRequest(Uri voicemailUri) {
             Intent intent = new Intent(VoicemailContract.ACTION_FETCH_VOICEMAIL, voicemailUri);
             mApplicationContext.sendBroadcast(intent);
         }

         @Override
         public boolean queryHasContent(Uri voicemailUri) {
             ContentResolver contentResolver = mApplicationContext.getContentResolver();
             Cursor cursor = contentResolver.query(
                     voicemailUri, HAS_CONTENT_PROJECTION, null, null, null);
             try {
                 if (cursor != null && cursor.moveToNext()) {
                     return cursor.getInt(cursor.getColumnIndexOrThrow(
                             VoicemailContract.Voicemails.HAS_CONTENT)) == 1;
                 }
             } finally {
                 MoreCloseables.closeQuietly(cursor);
             }
             return false;
         }

         private AudioManager getAudioManager() {
             return (AudioManager) mApplicationContext.getSystemService(Context.AUDIO_SERVICE);
         }

         @Override
         public boolean isSpeakerPhoneOn() {
             return getAudioManager().isSpeakerphoneOn();
         }

         @Override
         public void setSpeakerPhoneOn(boolean on) {
             getAudioManager().setSpeakerphoneOn(on);
             if (on) {
                 mPlaybackSpeakerphone.setImageResource(R.drawable.ic_speakerphone_on);
             } else {
                 mPlaybackSpeakerphone.setImageResource(R.drawable.ic_speakerphone_off);
             }
         }

         @Override
         public void setVolumeControlStream(int streamType) {
             Activity activity = mActivityReference.get();
             if (activity != null) {
                 activity.setVolumeControlStream(streamType);
             }
         }
     }

     /**
      * Controls a TextView with dynamically changing text.
      * <p>
      * There are two methods here of interest,
      * {@link TextViewWithMessagesController#setPermanentText(String)} and
      * {@link TextViewWithMessagesController#setTemporaryText(String, long, TimeUnit)}.  The
      * former is used to set the text on the text view immediately, and is used in our case for
      * the countdown of duration remaining during voicemail playback.  The second is used to
      * temporarily replace this countdown with a message, in our case faster voicemail speed or
      * slower voicemail speed, before returning to the countdown display.
      * <p>
      * All the methods on this class must be called from the ui thread.
      */
     private static final class TextViewWithMessagesController {
         private static final float VISIBLE = 1;
         private static final float INVISIBLE = 0;
         private static final long SHORT_ANIMATION_MS = 200;
         private static final long LONG_ANIMATION_MS = 400;
         private final Object mLock = new Object();
         private final TextView mPermanentTextView;
         private final TextView mTemporaryTextView;
         @GuardedBy("mLock") private Runnable mRunnable;

         public TextViewWithMessagesController(TextView permanentTextView,
                 TextView temporaryTextView) {
             mPermanentTextView = permanentTextView;
             mTemporaryTextView = temporaryTextView;
         }

         public void setPermanentText(String text) {
             mPermanentTextView.setText(text);
         }

         public void setTemporaryText(String text, long duration, TimeUnit units) {
             synchronized (mLock) {
                 mTemporaryTextView.setText(text);
                 mTemporaryTextView.animate().alpha(VISIBLE).setDuration(SHORT_ANIMATION_MS);
                 mPermanentTextView.animate().alpha(INVISIBLE).setDuration(SHORT_ANIMATION_MS);
                 mRunnable = new Runnable() {
                     @Override
                     public void run() {
                         synchronized (mLock) {
                             // We check for (mRunnable == this) becuase if not true, then another
                             // setTemporaryText call has taken place in the meantime, and this
                             // one is now defunct and needs to take no action.
                             if (mRunnable == this) {
                                 mRunnable = null;
                                 mTemporaryTextView.animate()
                                         .alpha(INVISIBLE).setDuration(LONG_ANIMATION_MS);
                                 mPermanentTextView.animate()
                                         .alpha(VISIBLE).setDuration(LONG_ANIMATION_MS);
                             }
                         }
                     }
                 };
                 mTemporaryTextView.postDelayed(mRunnable, units.toMillis(duration));
             }
         }
     }
 }
	/*
	* Copyright (C) 2011 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.android.contacts.voicemail;

	import static com.android.contacts.CallDetailActivity.EXTRA_VOICEMAIL_START_PLAYBACK;
	import static com.android.contacts.CallDetailActivity.EXTRA_VOICEMAIL_URI;

	import com.android.common.io.MoreCloseables;
	import com.android.contacts.ProximitySensorAware;
	import com.android.contacts.R;
	import com.android.contacts.util.AsyncTaskExecutors;
	import com.android.ex.variablespeed.MediaPlayerProxy;
	import com.android.ex.variablespeed.VariableSpeed;
	import com.google.common.base.Preconditions;

	import android.app.Activity;
	import android.app.Fragment;
	import android.content.ContentResolver;
	import android.content.Context;
	import android.content.Intent;
	import android.database.ContentObserver;
	import android.database.Cursor;
	import android.media.AudioManager;
	import android.net.Uri;
	import android.os.Bundle;
	import android.os.PowerManager;
	import android.provider.VoicemailContract;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.ImageButton;
	import android.widget.SeekBar;
	import android.widget.TextView;

	import java.util.concurrent.ExecutorService;
	import java.util.concurrent.Executors;
	import java.util.concurrent.ScheduledExecutorService;
	import java.util.concurrent.TimeUnit;

	import javax.annotation.concurrent.GuardedBy;
	import javax.annotation.concurrent.NotThreadSafe;

	/**
	* Displays and plays back a single voicemail.
	* <p>
	* When the Activity containing this Fragment is created, voicemail playback
	* will begin immediately. The Activity is expected to be started via an intent
	* containing a suitable voicemail uri to playback.
	* <p>
	* This class is not thread-safe, it is thread-confined. All calls to all public
	* methods on this class are expected to come from the main ui thread.
	*/
	@NotThreadSafe
	public class VoicemailPlaybackFragment extends Fragment {
	private static final String TAG = "VoicemailPlayback";
	private static final int NUMBER_OF_THREADS_IN_POOL = 2;
	private static final String[] HAS_CONTENT_PROJECTION = new String[] {
	VoicemailContract.Voicemails.HAS_CONTENT,
	};

	private VoicemailPlaybackPresenter mPresenter;
	private ScheduledExecutorService mScheduledExecutorService;
	private View mPlaybackLayout;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	Bundle savedInstanceState) {
	mPlaybackLayout = inflater.inflate(R.layout.playback_layout, null);
	return mPlaybackLayout;
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);
	mScheduledExecutorService = createScheduledExecutorService();
	Bundle arguments = getArguments();
	Preconditions.checkNotNull(arguments, "fragment must be started with arguments");
	Uri voicemailUri = arguments.getParcelable(EXTRA_VOICEMAIL_URI);
	Preconditions.checkNotNull(voicemailUri, "fragment must contain EXTRA_VOICEMAIL_URI");
	boolean startPlayback = arguments.getBoolean(EXTRA_VOICEMAIL_START_PLAYBACK, false);
	PowerManager powerManager =
	(PowerManager) getActivity().getSystemService(Context.POWER_SERVICE);
	PowerManager.WakeLock wakeLock =
	powerManager.newWakeLock(
	PowerManager.SCREEN_DIM_WAKE_LOCK, getClass().getSimpleName());
	mPresenter = new VoicemailPlaybackPresenter(createPlaybackViewImpl(),
	createMediaPlayer(mScheduledExecutorService), voicemailUri,
	mScheduledExecutorService, startPlayback,
	AsyncTaskExecutors.createAsyncTaskExecutor(), wakeLock);
	mPresenter.onCreate(savedInstanceState);
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
	mPresenter.onSaveInstanceState(outState);
	super.onSaveInstanceState(outState);
	}

	@Override
	public void onDestroy() {
	mPresenter.onDestroy();
	mScheduledExecutorService.shutdown();
	super.onDestroy();
	}

	@Override
	public void onPause() {
	mPresenter.onPause();
	super.onPause();
	}

	private PlaybackViewImpl createPlaybackViewImpl() {
	return new PlaybackViewImpl(new ActivityReference(), getActivity().getApplicationContext(),
	mPlaybackLayout);
	}

	private MediaPlayerProxy createMediaPlayer(ExecutorService executorService) {
	return VariableSpeed.createVariableSpeed(executorService);
	}

	private ScheduledExecutorService createScheduledExecutorService() {
	return Executors.newScheduledThreadPool(NUMBER_OF_THREADS_IN_POOL);
	}

	/**
	* Formats a number of milliseconds as something that looks like {@code 00:05}.
	* <p>
	* We always use four digits, two for minutes two for seconds. In the very unlikely event
	* that the voicemail duration exceeds 99 minutes, the display is capped at 99 minutes.
	*/
	private static String formatAsMinutesAndSeconds(int millis) {
	int seconds = millis / 1000;
	int minutes = seconds / 60;
	seconds -= minutes * 60;
	if (minutes > 99) {
	minutes = 99;
	}
	return String.format("%02d:%02d", minutes, seconds);
	}

	/**
	* An object that can provide us with an Activity.
	* <p>
	* Fragments suffer the drawback that the Activity they belong to may sometimes be null. This
	* can happen if the Fragment is detached, for example. In that situation a call to
	* {@link Fragment#getString(int)} will throw and {@link IllegalStateException}. Also, calling
	* {@link Fragment#getActivity()} is dangerous - it may sometimes return null. And thus blindly
	* calling a method on the result of getActivity() is dangerous too.
	* <p>
	* To work around this, I have made the {@link PlaybackViewImpl} class static, so that it does
	* not have access to any Fragment methods directly. Instead it uses an application Context for
	* things like accessing strings, accessing system services. It only uses the Activity when it
	* absolutely needs it - and does so through this class. This makes it easy to see where we have
	* to check for null properly.
	*/
	private final class ActivityReference {
	/** Gets this Fragment's Activity: <b>may be null</b>. */
	public final Activity get() {
	return getActivity();
	}
	}

	/** Methods required by the PlaybackView for the VoicemailPlaybackPresenter. */
	private static final class PlaybackViewImpl implements VoicemailPlaybackPresenter.PlaybackView {
	private final ActivityReference mActivityReference;
	private final Context mApplicationContext;
	private final SeekBar mPlaybackSeek;
	private final ImageButton mStartStopButton;
	private final ImageButton mPlaybackSpeakerphone;
	private final ImageButton mRateDecreaseButton;
	private final ImageButton mRateIncreaseButton;
	private final TextViewWithMessagesController mTextController;

	public PlaybackViewImpl(ActivityReference activityReference, Context applicationContext,
	View playbackLayout) {
	Preconditions.checkNotNull(activityReference);
	Preconditions.checkNotNull(applicationContext);
	Preconditions.checkNotNull(playbackLayout);
	mActivityReference = activityReference;
	mApplicationContext = applicationContext;
	mPlaybackSeek = (SeekBar) playbackLayout.findViewById(R.id.playback_seek);
	mStartStopButton = (ImageButton) playbackLayout.findViewById(
	R.id.playback_start_stop);
	mPlaybackSpeakerphone = (ImageButton) playbackLayout.findViewById(
	R.id.playback_speakerphone);
	mRateDecreaseButton = (ImageButton) playbackLayout.findViewById(
	R.id.rate_decrease_button);
	mRateIncreaseButton = (ImageButton) playbackLayout.findViewById(
	R.id.rate_increase_button);
	mTextController = new TextViewWithMessagesController(
	(TextView) playbackLayout.findViewById(R.id.playback_position_text),
	(TextView) playbackLayout.findViewById(R.id.playback_speed_text));
	}

	@Override
	public void finish() {
	Activity activity = mActivityReference.get();
	if (activity != null) {
	activity.finish();
	}
	}

	@Override
	public void runOnUiThread(Runnable runnable) {
	Activity activity = mActivityReference.get();
	if (activity != null) {
	activity.runOnUiThread(runnable);
	}
	}

	@Override
	public Context getDataSourceContext() {
	return mApplicationContext;
	}

	@Override
	public void setRateDecreaseButtonListener(View.OnClickListener listener) {
	mRateDecreaseButton.setOnClickListener(listener);
	}

	@Override
	public void setRateIncreaseButtonListener(View.OnClickListener listener) {
	mRateIncreaseButton.setOnClickListener(listener);
	}

	@Override
	public void setStartStopListener(View.OnClickListener listener) {
	mStartStopButton.setOnClickListener(listener);
	}

	@Override
	public void setSpeakerphoneListener(View.OnClickListener listener) {
	mPlaybackSpeakerphone.setOnClickListener(listener);
	}

	@Override
	public void setRateDisplay(float rate, int stringResourceId) {
	mTextController.setTemporaryText(
	mApplicationContext.getString(stringResourceId), 1, TimeUnit.SECONDS);
	}

	@Override
	public void setPositionSeekListener(SeekBar.OnSeekBarChangeListener listener) {
	mPlaybackSeek.setOnSeekBarChangeListener(listener);
	}

	@Override
	public void playbackStarted() {
	mStartStopButton.setImageResource(R.drawable.ic_hold_pause_holo_dark);
	}

	@Override
	public void playbackStopped() {
	mStartStopButton.setImageResource(R.drawable.ic_play);
	}

	@Override
	public void enableProximitySensor() {
	// Only change the state if the activity is still around.
	Activity activity = mActivityReference.get();
	if (activity != null && activity instanceof ProximitySensorAware) {
	((ProximitySensorAware) activity).enableProximitySensor();
	}
	}

	@Override
	public void disableProximitySensor() {
	// Only change the state if the activity is still around.
	Activity activity = mActivityReference.get();
	if (activity != null && activity instanceof ProximitySensorAware) {
	((ProximitySensorAware) activity).disableProximitySensor(true);
	}
	}

	@Override
	public void registerContentObserver(Uri uri, ContentObserver observer) {
	mApplicationContext.getContentResolver().registerContentObserver(uri, false, observer);
	}

	@Override
	public void unregisterContentObserver(ContentObserver observer) {
	mApplicationContext.getContentResolver().unregisterContentObserver(observer);
	}

	@Override
	public void setClipPosition(int clipPositionInMillis, int clipLengthInMillis) {
	int seekBarPosition = Math.max(0, clipPositionInMillis);
	int seekBarMax = Math.max(seekBarPosition, clipLengthInMillis);
	if (mPlaybackSeek.getMax() != seekBarMax) {
	mPlaybackSeek.setMax(seekBarMax);
	}
	mPlaybackSeek.setProgress(seekBarPosition);
	mTextController.setPermanentText(
	formatAsMinutesAndSeconds(seekBarMax - seekBarPosition));
	}

	private String getString(int resId) {
	return mApplicationContext.getString(resId);
	}

	@Override
	public void setIsBuffering() {
	disableUiElements();
	mTextController.setPermanentText(getString(R.string.voicemail_buffering));
	}

	@Override
	public void setIsFetchingContent() {
	disableUiElements();
	mTextController.setPermanentText(getString(R.string.voicemail_fetching_content));
	}

	@Override
	public void setFetchContentTimeout() {
	disableUiElements();
	mTextController.setPermanentText(getString(R.string.voicemail_fetching_timout));
	}

	@Override
	public int getDesiredClipPosition() {
	return mPlaybackSeek.getProgress();
	}

	@Override
	public void disableUiElements() {
	mRateIncreaseButton.setEnabled(false);
	mRateDecreaseButton.setEnabled(false);
	mStartStopButton.setEnabled(false);
	mPlaybackSpeakerphone.setEnabled(false);
	mPlaybackSeek.setProgress(0);
	mPlaybackSeek.setEnabled(false);
	}

	@Override
	public void playbackError(Exception e) {
	disableUiElements();
	mTextController.setPermanentText(getString(R.string.voicemail_playback_error));
	Log.e(TAG, "Could not play voicemail", e);
	}

	@Override
	public void enableUiElements() {
	mRateIncreaseButton.setEnabled(true);
	mRateDecreaseButton.setEnabled(true);
	mStartStopButton.setEnabled(true);
	mPlaybackSpeakerphone.setEnabled(true);
	mPlaybackSeek.setEnabled(true);
	}

	@Override
	public void sendFetchVoicemailRequest(Uri voicemailUri) {
	Intent intent = new Intent(VoicemailContract.ACTION_FETCH_VOICEMAIL, voicemailUri);
	mApplicationContext.sendBroadcast(intent);
	}

	@Override
	public boolean queryHasContent(Uri voicemailUri) {
	ContentResolver contentResolver = mApplicationContext.getContentResolver();
	Cursor cursor = contentResolver.query(
	voicemailUri, HAS_CONTENT_PROJECTION, null, null, null);
	try {
	if (cursor != null && cursor.moveToNext()) {
	return cursor.getInt(cursor.getColumnIndexOrThrow(
	VoicemailContract.Voicemails.HAS_CONTENT)) == 1;
	}
	} finally {
	MoreCloseables.closeQuietly(cursor);
	}
	return false;
	}

	private AudioManager getAudioManager() {
	return (AudioManager) mApplicationContext.getSystemService(Context.AUDIO_SERVICE);
	}

	@Override
	public boolean isSpeakerPhoneOn() {
	return getAudioManager().isSpeakerphoneOn();
	}

	@Override
	public void setSpeakerPhoneOn(boolean on) {
	getAudioManager().setSpeakerphoneOn(on);
	if (on) {
	mPlaybackSpeakerphone.setImageResource(R.drawable.ic_speakerphone_on);
	} else {
	mPlaybackSpeakerphone.setImageResource(R.drawable.ic_speakerphone_off);
	}
	}

	@Override
	public void setVolumeControlStream(int streamType) {
	Activity activity = mActivityReference.get();
	if (activity != null) {
	activity.setVolumeControlStream(streamType);
	}
	}
	}

	/**
	* Controls a TextView with dynamically changing text.
	* <p>
	* There are two methods here of interest,
	* {@link TextViewWithMessagesController#setPermanentText(String)} and
	* {@link TextViewWithMessagesController#setTemporaryText(String, long, TimeUnit)}. The
	* former is used to set the text on the text view immediately, and is used in our case for
	* the countdown of duration remaining during voicemail playback. The second is used to
	* temporarily replace this countdown with a message, in our case faster voicemail speed or
	* slower voicemail speed, before returning to the countdown display.
	* <p>
	* All the methods on this class must be called from the ui thread.
	*/
	private static final class TextViewWithMessagesController {
	private static final float VISIBLE = 1;
	private static final float INVISIBLE = 0;
	private static final long SHORT_ANIMATION_MS = 200;
	private static final long LONG_ANIMATION_MS = 400;
	private final Object mLock = new Object();
	private final TextView mPermanentTextView;
	private final TextView mTemporaryTextView;
	@GuardedBy("mLock") private Runnable mRunnable;

	public TextViewWithMessagesController(TextView permanentTextView,
	TextView temporaryTextView) {
	mPermanentTextView = permanentTextView;
	mTemporaryTextView = temporaryTextView;
	}

	public void setPermanentText(String text) {
	mPermanentTextView.setText(text);
	}

	public void setTemporaryText(String text, long duration, TimeUnit units) {
	synchronized (mLock) {
	mTemporaryTextView.setText(text);
	mTemporaryTextView.animate().alpha(VISIBLE).setDuration(SHORT_ANIMATION_MS);
	mPermanentTextView.animate().alpha(INVISIBLE).setDuration(SHORT_ANIMATION_MS);
	mRunnable = new Runnable() {
	@Override
	public void run() {
	synchronized (mLock) {
	// We check for (mRunnable == this) becuase if not true, then another
	// setTemporaryText call has taken place in the meantime, and this
	// one is now defunct and needs to take no action.
	if (mRunnable == this) {
	mRunnable = null;
	mTemporaryTextView.animate()
	.alpha(INVISIBLE).setDuration(LONG_ANIMATION_MS);
	mPermanentTextView.animate()
	.alpha(VISIBLE).setDuration(LONG_ANIMATION_MS);
	}
	}
	}
	};
	mTemporaryTextView.postDelayed(mRunnable, units.toMillis(duration));
	}
	}
	}
	}