java/com/android/dialer/app/voicemail/VoicemailPlaybackLayout.java - platform/packages/apps/Dialer - Gitiles

 /*
  * 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.dialer.app.voicemail;

 import android.content.Context;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Handler;
 import android.support.annotation.VisibleForTesting;
 import android.support.design.widget.Snackbar;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.ImageButton;
 import android.widget.LinearLayout;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 import android.widget.TextView;
 import com.android.dialer.app.PhoneCallDetails;
 import com.android.dialer.app.R;
 import com.android.dialer.app.calllog.CallLogAsyncTaskUtil;
 import com.android.dialer.app.calllog.CallLogListItemViewHolder;
 import com.android.dialer.logging.Logger;
 import com.android.dialer.logging.nano.DialerImpression;
 import java.util.Objects;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.concurrent.GuardedBy;
 import javax.annotation.concurrent.NotThreadSafe;
 import javax.annotation.concurrent.ThreadSafe;

 /**
  * Displays and plays a single voicemail. See {@link VoicemailPlaybackPresenter} for details on the
  * voicemail playback implementation.
  *
  * <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 VoicemailPlaybackLayout extends LinearLayout
     implements VoicemailPlaybackPresenter.PlaybackView,
         CallLogAsyncTaskUtil.CallLogAsyncTaskListener {

   private static final String TAG = VoicemailPlaybackLayout.class.getSimpleName();
   private static final int VOICEMAIL_DELETE_DELAY_MS = 3000;

   private Context mContext;
   private CallLogListItemViewHolder mViewHolder;
   private VoicemailPlaybackPresenter mPresenter;
   /** Click listener to toggle speakerphone. */
   private final View.OnClickListener mSpeakerphoneListener =
       new View.OnClickListener() {
         @Override
         public void onClick(View v) {
           if (mPresenter != null) {
             mPresenter.toggleSpeakerphone();
           }
         }
       };

   private Uri mVoicemailUri;
   private final View.OnClickListener mDeleteButtonListener =
       new View.OnClickListener() {
         @Override
         public void onClick(View view) {
           Logger.get(mContext).logImpression(DialerImpression.Type.VOICEMAIL_DELETE_ENTRY);
           if (mPresenter == null) {
             return;
           }

           // When the undo button is pressed, the viewHolder we have is no longer valid because when
           // we hide the view it is binded to something else, and the layout is not updated for
           // hidden items. copy the adapter position so we can update the view upon undo.
           // TODO: refactor this so the view holder will always be valid.
           final int adapterPosition = mViewHolder.getAdapterPosition();

           mPresenter.pausePlayback();
           mPresenter.onVoicemailDeleted(mViewHolder);

           final Uri deleteUri = mVoicemailUri;
           final Runnable deleteCallback =
               new Runnable() {
                 @Override
                 public void run() {
                   if (Objects.equals(deleteUri, mVoicemailUri)) {
                     CallLogAsyncTaskUtil.deleteVoicemail(
                         mContext, deleteUri, VoicemailPlaybackLayout.this);
                   }
                 }
               };

           final Handler handler = new Handler();
           // Add a little buffer time in case the user clicked "undo" at the end of the delay
           // window.
           handler.postDelayed(deleteCallback, VOICEMAIL_DELETE_DELAY_MS + 50);

           Snackbar.make(
                   VoicemailPlaybackLayout.this,
                   R.string.snackbar_voicemail_deleted,
                   Snackbar.LENGTH_LONG)
               .setDuration(VOICEMAIL_DELETE_DELAY_MS)
               .setAction(
                   R.string.snackbar_voicemail_deleted_undo,
                   new View.OnClickListener() {
                     @Override
                     public void onClick(View view) {
                       mPresenter.onVoicemailDeleteUndo(adapterPosition);
                       handler.removeCallbacks(deleteCallback);
                     }
                   })
               .setActionTextColor(
                   mContext.getResources().getColor(R.color.dialer_snackbar_action_text_color))
               .show();
         }
       };
   private boolean mIsPlaying = false;
   /** Click listener to play or pause voicemail playback. */
   private final View.OnClickListener mStartStopButtonListener =
       new View.OnClickListener() {
         @Override
         public void onClick(View view) {
           if (mPresenter == null) {
             return;
           }

           if (mIsPlaying) {
             mPresenter.pausePlayback();
           } else {
             Logger.get(mContext)
                 .logImpression(DialerImpression.Type.VOICEMAIL_PLAY_AUDIO_AFTER_EXPANDING_ENTRY);
             mPresenter.resumePlayback();
           }
         }
       };

   private SeekBar mPlaybackSeek;
   private ImageButton mStartStopButton;
   private ImageButton mPlaybackSpeakerphone;
   private ImageButton mDeleteButton;
   private TextView mStateText;
   private TextView mPositionText;
   private TextView mTotalDurationText;
   /** Handle state changes when the user manipulates the seek bar. */
   private final OnSeekBarChangeListener mSeekBarChangeListener =
       new OnSeekBarChangeListener() {
         @Override
         public void onStartTrackingTouch(SeekBar seekBar) {
           if (mPresenter != null) {
             mPresenter.pausePlaybackForSeeking();
           }
         }

         @Override
         public void onStopTrackingTouch(SeekBar seekBar) {
           if (mPresenter != null) {
             mPresenter.resumePlaybackAfterSeeking(seekBar.getProgress());
           }
         }

         @Override
         public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
           setClipPosition(progress, seekBar.getMax());
           // Update the seek position if user manually changed it. This makes sure position gets
           // updated when user use volume button to seek playback in talkback mode.
           if (fromUser) {
             mPresenter.seek(progress);
           }
         }
       };

   private PositionUpdater mPositionUpdater;
   private Drawable mVoicemailSeekHandleEnabled;
   private Drawable mVoicemailSeekHandleDisabled;

   public VoicemailPlaybackLayout(Context context) {
     this(context, null);
   }

   public VoicemailPlaybackLayout(Context context, AttributeSet attrs) {
     super(context, attrs);
     mContext = context;
     LayoutInflater inflater =
         (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     inflater.inflate(R.layout.voicemail_playback_layout, this);
   }

   public void setViewHolder(CallLogListItemViewHolder mViewHolder) {
     this.mViewHolder = mViewHolder;
   }

   @Override
   public void setPresenter(VoicemailPlaybackPresenter presenter, Uri voicemailUri) {
     mPresenter = presenter;
     mVoicemailUri = voicemailUri;
   }

   @Override
   protected void onFinishInflate() {
     super.onFinishInflate();

     mPlaybackSeek = (SeekBar) findViewById(R.id.playback_seek);
     mStartStopButton = (ImageButton) findViewById(R.id.playback_start_stop);
     mPlaybackSpeakerphone = (ImageButton) findViewById(R.id.playback_speakerphone);
     mDeleteButton = (ImageButton) findViewById(R.id.delete_voicemail);

     mStateText = (TextView) findViewById(R.id.playback_state_text);
     mStateText.setAccessibilityLiveRegion(ACCESSIBILITY_LIVE_REGION_POLITE);
     mPositionText = (TextView) findViewById(R.id.playback_position_text);
     mTotalDurationText = (TextView) findViewById(R.id.total_duration_text);

     mPlaybackSeek.setOnSeekBarChangeListener(mSeekBarChangeListener);
     mStartStopButton.setOnClickListener(mStartStopButtonListener);
     mPlaybackSpeakerphone.setOnClickListener(mSpeakerphoneListener);
     mDeleteButton.setOnClickListener(mDeleteButtonListener);

     mPositionText.setText(formatAsMinutesAndSeconds(0));
     mTotalDurationText.setText(formatAsMinutesAndSeconds(0));

     mVoicemailSeekHandleEnabled =
         getResources().getDrawable(R.drawable.ic_voicemail_seek_handle, mContext.getTheme());
     mVoicemailSeekHandleDisabled =
         getResources()
             .getDrawable(R.drawable.ic_voicemail_seek_handle_disabled, mContext.getTheme());
   }

   @Override
   public void onPlaybackStarted(int duration, ScheduledExecutorService executorService) {
     mIsPlaying = true;

     mStartStopButton.setImageResource(R.drawable.ic_pause);

     if (mPositionUpdater != null) {
       mPositionUpdater.stopUpdating();
       mPositionUpdater = null;
     }
     mPositionUpdater = new PositionUpdater(duration, executorService);
     mPositionUpdater.startUpdating();
   }

   @Override
   public void onPlaybackStopped() {
     mIsPlaying = false;

     mStartStopButton.setImageResource(R.drawable.ic_play_arrow);

     if (mPositionUpdater != null) {
       mPositionUpdater.stopUpdating();
       mPositionUpdater = null;
     }
   }

   @Override
   public void onPlaybackError() {
     if (mPositionUpdater != null) {
       mPositionUpdater.stopUpdating();
     }

     disableUiElements();
     mStateText.setText(getString(R.string.voicemail_playback_error));
   }

   @Override
   public void onSpeakerphoneOn(boolean on) {
     if (on) {
       mPlaybackSpeakerphone.setImageResource(R.drawable.ic_volume_up_24dp);
       // Speaker is now on, tapping button will turn it off.
       mPlaybackSpeakerphone.setContentDescription(
           mContext.getString(R.string.voicemail_speaker_off));
     } else {
       mPlaybackSpeakerphone.setImageResource(R.drawable.ic_volume_down_24dp);
       // Speaker is now off, tapping button will turn it on.
       mPlaybackSpeakerphone.setContentDescription(
           mContext.getString(R.string.voicemail_speaker_on));
     }
   }

   @Override
   public void setClipPosition(int positionMs, int durationMs) {
     int seekBarPositionMs = Math.max(0, positionMs);
     int seekBarMax = Math.max(seekBarPositionMs, durationMs);
     if (mPlaybackSeek.getMax() != seekBarMax) {
       mPlaybackSeek.setMax(seekBarMax);
     }

     mPlaybackSeek.setProgress(seekBarPositionMs);

     mPositionText.setText(formatAsMinutesAndSeconds(seekBarPositionMs));
     mTotalDurationText.setText(formatAsMinutesAndSeconds(durationMs));
   }

   @Override
   public void setSuccess() {
     mStateText.setText(null);
   }

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

   @Override
   public void setFetchContentTimeout() {
     mStartStopButton.setEnabled(true);
     mStateText.setText(getString(R.string.voicemail_fetching_timout));
   }

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

   @Override
   public void disableUiElements() {
     mStartStopButton.setEnabled(false);
     resetSeekBar();
   }

   @Override
   public void enableUiElements() {
     mDeleteButton.setEnabled(true);
     mStartStopButton.setEnabled(true);
     mPlaybackSeek.setEnabled(true);
     mPlaybackSeek.setThumb(mVoicemailSeekHandleEnabled);
   }

   @Override
   public void resetSeekBar() {
     mPlaybackSeek.setProgress(0);
     mPlaybackSeek.setEnabled(false);
     mPlaybackSeek.setThumb(mVoicemailSeekHandleDisabled);
   }

   @Override
   public void onDeleteCall() {}

   @Override
   public void onDeleteVoicemail() {
     mPresenter.onVoicemailDeletedInDatabase();
   }

   @Override
   public void onGetCallDetails(PhoneCallDetails[] details) {}

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

   /**
    * 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 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);
   }

   @VisibleForTesting
   public String getStateText() {
     return mStateText.getText().toString();
   }

   /** Controls the animation of the playback slider. */
   @ThreadSafe
   private final class PositionUpdater implements Runnable {

     /** Update rate for the slider, 30fps. */
     private static final int SLIDER_UPDATE_PERIOD_MILLIS = 1000 / 30;

     private final ScheduledExecutorService mExecutorService;
     private final Object mLock = new Object();
     private int mDurationMs;

     @GuardedBy("mLock")
     private ScheduledFuture<?> mScheduledFuture;

     private Runnable mUpdateClipPositionRunnable =
         new Runnable() {
           @Override
           public void run() {
             int currentPositionMs = 0;
             synchronized (mLock) {
               if (mScheduledFuture == null || mPresenter == null) {
                 // This task has been canceled. Just stop now.
                 return;
               }
               currentPositionMs = mPresenter.getMediaPlayerPosition();
             }
             setClipPosition(currentPositionMs, mDurationMs);
           }
         };

     public PositionUpdater(int durationMs, ScheduledExecutorService executorService) {
       mDurationMs = durationMs;
       mExecutorService = executorService;
     }

     @Override
     public void run() {
       post(mUpdateClipPositionRunnable);
     }

     public void startUpdating() {
       synchronized (mLock) {
         cancelPendingRunnables();
         mScheduledFuture =
             mExecutorService.scheduleAtFixedRate(
                 this, 0, SLIDER_UPDATE_PERIOD_MILLIS, TimeUnit.MILLISECONDS);
       }
     }

     public void stopUpdating() {
       synchronized (mLock) {
         cancelPendingRunnables();
       }
     }

     @GuardedBy("mLock")
     private void cancelPendingRunnables() {
       if (mScheduledFuture != null) {
         mScheduledFuture.cancel(true);
         mScheduledFuture = null;
       }
       removeCallbacks(mUpdateClipPositionRunnable);
     }
   }
 }
	/*
	* 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.dialer.app.voicemail;

	import android.content.Context;
	import android.graphics.drawable.Drawable;
	import android.net.Uri;
	import android.os.Handler;
	import android.support.annotation.VisibleForTesting;
	import android.support.design.widget.Snackbar;
	import android.util.AttributeSet;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.widget.ImageButton;
	import android.widget.LinearLayout;
	import android.widget.SeekBar;
	import android.widget.SeekBar.OnSeekBarChangeListener;
	import android.widget.TextView;
	import com.android.dialer.app.PhoneCallDetails;
	import com.android.dialer.app.R;
	import com.android.dialer.app.calllog.CallLogAsyncTaskUtil;
	import com.android.dialer.app.calllog.CallLogListItemViewHolder;
	import com.android.dialer.logging.Logger;
	import com.android.dialer.logging.nano.DialerImpression;
	import java.util.Objects;
	import java.util.concurrent.ScheduledExecutorService;
	import java.util.concurrent.ScheduledFuture;
	import java.util.concurrent.TimeUnit;
	import javax.annotation.concurrent.GuardedBy;
	import javax.annotation.concurrent.NotThreadSafe;
	import javax.annotation.concurrent.ThreadSafe;

	/**
	* Displays and plays a single voicemail. See {@link VoicemailPlaybackPresenter} for details on the
	* voicemail playback implementation.
	*
	* <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 VoicemailPlaybackLayout extends LinearLayout
	implements VoicemailPlaybackPresenter.PlaybackView,
	CallLogAsyncTaskUtil.CallLogAsyncTaskListener {

	private static final String TAG = VoicemailPlaybackLayout.class.getSimpleName();
	private static final int VOICEMAIL_DELETE_DELAY_MS = 3000;

	private Context mContext;
	private CallLogListItemViewHolder mViewHolder;
	private VoicemailPlaybackPresenter mPresenter;
	/** Click listener to toggle speakerphone. */
	private final View.OnClickListener mSpeakerphoneListener =
	new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	if (mPresenter != null) {
	mPresenter.toggleSpeakerphone();
	}
	}
	};

	private Uri mVoicemailUri;
	private final View.OnClickListener mDeleteButtonListener =
	new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	Logger.get(mContext).logImpression(DialerImpression.Type.VOICEMAIL_DELETE_ENTRY);
	if (mPresenter == null) {
	return;
	}

	// When the undo button is pressed, the viewHolder we have is no longer valid because when
	// we hide the view it is binded to something else, and the layout is not updated for
	// hidden items. copy the adapter position so we can update the view upon undo.
	// TODO: refactor this so the view holder will always be valid.
	final int adapterPosition = mViewHolder.getAdapterPosition();

	mPresenter.pausePlayback();
	mPresenter.onVoicemailDeleted(mViewHolder);

	final Uri deleteUri = mVoicemailUri;
	final Runnable deleteCallback =
	new Runnable() {
	@Override
	public void run() {
	if (Objects.equals(deleteUri, mVoicemailUri)) {
	CallLogAsyncTaskUtil.deleteVoicemail(
	mContext, deleteUri, VoicemailPlaybackLayout.this);
	}
	}
	};

	final Handler handler = new Handler();
	// Add a little buffer time in case the user clicked "undo" at the end of the delay
	// window.
	handler.postDelayed(deleteCallback, VOICEMAIL_DELETE_DELAY_MS + 50);

	Snackbar.make(
	VoicemailPlaybackLayout.this,
	R.string.snackbar_voicemail_deleted,
	Snackbar.LENGTH_LONG)
	.setDuration(VOICEMAIL_DELETE_DELAY_MS)
	.setAction(
	R.string.snackbar_voicemail_deleted_undo,
	new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	mPresenter.onVoicemailDeleteUndo(adapterPosition);
	handler.removeCallbacks(deleteCallback);
	}
	})
	.setActionTextColor(
	mContext.getResources().getColor(R.color.dialer_snackbar_action_text_color))
	.show();
	}
	};
	private boolean mIsPlaying = false;
	/** Click listener to play or pause voicemail playback. */
	private final View.OnClickListener mStartStopButtonListener =
	new View.OnClickListener() {
	@Override
	public void onClick(View view) {
	if (mPresenter == null) {
	return;
	}

	if (mIsPlaying) {
	mPresenter.pausePlayback();
	} else {
	Logger.get(mContext)
	.logImpression(DialerImpression.Type.VOICEMAIL_PLAY_AUDIO_AFTER_EXPANDING_ENTRY);
	mPresenter.resumePlayback();
	}
	}
	};

	private SeekBar mPlaybackSeek;
	private ImageButton mStartStopButton;
	private ImageButton mPlaybackSpeakerphone;
	private ImageButton mDeleteButton;
	private TextView mStateText;
	private TextView mPositionText;
	private TextView mTotalDurationText;
	/** Handle state changes when the user manipulates the seek bar. */
	private final OnSeekBarChangeListener mSeekBarChangeListener =
	new OnSeekBarChangeListener() {
	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
	if (mPresenter != null) {
	mPresenter.pausePlaybackForSeeking();
	}
	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
	if (mPresenter != null) {
	mPresenter.resumePlaybackAfterSeeking(seekBar.getProgress());
	}
	}

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
	setClipPosition(progress, seekBar.getMax());
	// Update the seek position if user manually changed it. This makes sure position gets
	// updated when user use volume button to seek playback in talkback mode.
	if (fromUser) {
	mPresenter.seek(progress);
	}
	}
	};

	private PositionUpdater mPositionUpdater;
	private Drawable mVoicemailSeekHandleEnabled;
	private Drawable mVoicemailSeekHandleDisabled;

	public VoicemailPlaybackLayout(Context context) {
	this(context, null);
	}

	public VoicemailPlaybackLayout(Context context, AttributeSet attrs) {
	super(context, attrs);
	mContext = context;
	LayoutInflater inflater =
	(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	inflater.inflate(R.layout.voicemail_playback_layout, this);
	}

	public void setViewHolder(CallLogListItemViewHolder mViewHolder) {
	this.mViewHolder = mViewHolder;
	}

	@Override
	public void setPresenter(VoicemailPlaybackPresenter presenter, Uri voicemailUri) {
	mPresenter = presenter;
	mVoicemailUri = voicemailUri;
	}

	@Override
	protected void onFinishInflate() {
	super.onFinishInflate();

	mPlaybackSeek = (SeekBar) findViewById(R.id.playback_seek);
	mStartStopButton = (ImageButton) findViewById(R.id.playback_start_stop);
	mPlaybackSpeakerphone = (ImageButton) findViewById(R.id.playback_speakerphone);
	mDeleteButton = (ImageButton) findViewById(R.id.delete_voicemail);

	mStateText = (TextView) findViewById(R.id.playback_state_text);
	mStateText.setAccessibilityLiveRegion(ACCESSIBILITY_LIVE_REGION_POLITE);
	mPositionText = (TextView) findViewById(R.id.playback_position_text);
	mTotalDurationText = (TextView) findViewById(R.id.total_duration_text);

	mPlaybackSeek.setOnSeekBarChangeListener(mSeekBarChangeListener);
	mStartStopButton.setOnClickListener(mStartStopButtonListener);
	mPlaybackSpeakerphone.setOnClickListener(mSpeakerphoneListener);
	mDeleteButton.setOnClickListener(mDeleteButtonListener);

	mPositionText.setText(formatAsMinutesAndSeconds(0));
	mTotalDurationText.setText(formatAsMinutesAndSeconds(0));

	mVoicemailSeekHandleEnabled =
	getResources().getDrawable(R.drawable.ic_voicemail_seek_handle, mContext.getTheme());
	mVoicemailSeekHandleDisabled =
	getResources()
	.getDrawable(R.drawable.ic_voicemail_seek_handle_disabled, mContext.getTheme());
	}

	@Override
	public void onPlaybackStarted(int duration, ScheduledExecutorService executorService) {
	mIsPlaying = true;

	mStartStopButton.setImageResource(R.drawable.ic_pause);

	if (mPositionUpdater != null) {
	mPositionUpdater.stopUpdating();
	mPositionUpdater = null;
	}
	mPositionUpdater = new PositionUpdater(duration, executorService);
	mPositionUpdater.startUpdating();
	}

	@Override
	public void onPlaybackStopped() {
	mIsPlaying = false;

	mStartStopButton.setImageResource(R.drawable.ic_play_arrow);

	if (mPositionUpdater != null) {
	mPositionUpdater.stopUpdating();
	mPositionUpdater = null;
	}
	}

	@Override
	public void onPlaybackError() {
	if (mPositionUpdater != null) {
	mPositionUpdater.stopUpdating();
	}

	disableUiElements();
	mStateText.setText(getString(R.string.voicemail_playback_error));
	}

	@Override
	public void onSpeakerphoneOn(boolean on) {
	if (on) {
	mPlaybackSpeakerphone.setImageResource(R.drawable.ic_volume_up_24dp);
	// Speaker is now on, tapping button will turn it off.
	mPlaybackSpeakerphone.setContentDescription(
	mContext.getString(R.string.voicemail_speaker_off));
	} else {
	mPlaybackSpeakerphone.setImageResource(R.drawable.ic_volume_down_24dp);
	// Speaker is now off, tapping button will turn it on.
	mPlaybackSpeakerphone.setContentDescription(
	mContext.getString(R.string.voicemail_speaker_on));
	}
	}

	@Override
	public void setClipPosition(int positionMs, int durationMs) {
	int seekBarPositionMs = Math.max(0, positionMs);
	int seekBarMax = Math.max(seekBarPositionMs, durationMs);
	if (mPlaybackSeek.getMax() != seekBarMax) {
	mPlaybackSeek.setMax(seekBarMax);
	}

	mPlaybackSeek.setProgress(seekBarPositionMs);

	mPositionText.setText(formatAsMinutesAndSeconds(seekBarPositionMs));
	mTotalDurationText.setText(formatAsMinutesAndSeconds(durationMs));
	}

	@Override
	public void setSuccess() {
	mStateText.setText(null);
	}

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

	@Override
	public void setFetchContentTimeout() {
	mStartStopButton.setEnabled(true);
	mStateText.setText(getString(R.string.voicemail_fetching_timout));
	}

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

	@Override
	public void disableUiElements() {
	mStartStopButton.setEnabled(false);
	resetSeekBar();
	}

	@Override
	public void enableUiElements() {
	mDeleteButton.setEnabled(true);
	mStartStopButton.setEnabled(true);
	mPlaybackSeek.setEnabled(true);
	mPlaybackSeek.setThumb(mVoicemailSeekHandleEnabled);
	}

	@Override
	public void resetSeekBar() {
	mPlaybackSeek.setProgress(0);
	mPlaybackSeek.setEnabled(false);
	mPlaybackSeek.setThumb(mVoicemailSeekHandleDisabled);
	}

	@Override
	public void onDeleteCall() {}

	@Override
	public void onDeleteVoicemail() {
	mPresenter.onVoicemailDeletedInDatabase();
	}

	@Override
	public void onGetCallDetails(PhoneCallDetails[] details) {}

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

	/**
	* 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 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);
	}

	@VisibleForTesting
	public String getStateText() {
	return mStateText.getText().toString();
	}

	/** Controls the animation of the playback slider. */
	@ThreadSafe
	private final class PositionUpdater implements Runnable {

	/** Update rate for the slider, 30fps. */
	private static final int SLIDER_UPDATE_PERIOD_MILLIS = 1000 / 30;

	private final ScheduledExecutorService mExecutorService;
	private final Object mLock = new Object();
	private int mDurationMs;

	@GuardedBy("mLock")
	private ScheduledFuture<?> mScheduledFuture;

	private Runnable mUpdateClipPositionRunnable =
	new Runnable() {
	@Override
	public void run() {
	int currentPositionMs = 0;
	synchronized (mLock) {
	if (mScheduledFuture == null \|\| mPresenter == null) {
	// This task has been canceled. Just stop now.
	return;
	}
	currentPositionMs = mPresenter.getMediaPlayerPosition();
	}
	setClipPosition(currentPositionMs, mDurationMs);
	}
	};

	public PositionUpdater(int durationMs, ScheduledExecutorService executorService) {
	mDurationMs = durationMs;
	mExecutorService = executorService;
	}

	@Override
	public void run() {
	post(mUpdateClipPositionRunnable);
	}

	public void startUpdating() {
	synchronized (mLock) {
	cancelPendingRunnables();
	mScheduledFuture =
	mExecutorService.scheduleAtFixedRate(
	this, 0, SLIDER_UPDATE_PERIOD_MILLIS, TimeUnit.MILLISECONDS);
	}
	}

	public void stopUpdating() {
	synchronized (mLock) {
	cancelPendingRunnables();
	}
	}

	@GuardedBy("mLock")
	private void cancelPendingRunnables() {
	if (mScheduledFuture != null) {
	mScheduledFuture.cancel(true);
	mScheduledFuture = null;
	}
	removeCallbacks(mUpdateClipPositionRunnable);
	}
	}
	}