src/com/android/car/radio/RadioDisplayController.java - platform/packages/apps/Car/Radio - Git at Google

 /*
  * 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.android.car.radio;

 import android.content.Context;
 import android.content.res.Resources;
 import android.media.session.PlaybackState;
 import android.text.TextUtils;
 import android.view.View;
 import android.view.ViewStub;
 import android.widget.ImageView;
 import android.widget.TextView;

 /**
  * Controller that controls the appearance state of various UI elements in the radio.
  */
 public class RadioDisplayController {
     private final Context mContext;

     private TextView mChannelBand;
     private TextView mChannelNumber;

     private CarouselView mChannelList;

     private TextView mCurrentSongTitle;
     private TextView mCurrentSongArtistOrStation;

     private ImageView mBackwardSeekButton;
     private ImageView mForwardSeekButton;

     private PlayPauseButton mPlayButton;
     private PlayPauseButton mPresetPlayButton;

     private ImageView mPresetsListButton;
     private ImageView mAddPresetsButton;

     public RadioDisplayController(Context context) {
         mContext = context;
     }

     public void initialize(View container) {
         // Note that the band and channel number can exist without the stub
         // single_channel_view_stub. Refer to setSingleChannelDisplay() for more information.
         mChannelBand = (TextView) container.findViewById(R.id.radio_station_band);
         mChannelNumber = (TextView) container.findViewById(R.id.radio_station_channel);

         mCurrentSongTitle = (TextView) container.findViewById(R.id.radio_station_song);
         mCurrentSongArtistOrStation =
                 (TextView) container.findViewById(R.id.radio_station_artist_or_station);

         mBackwardSeekButton = (ImageView) container.findViewById(R.id.radio_back_button);
         mForwardSeekButton = (ImageView) container.findViewById(R.id.radio_forward_button);

         mPlayButton = (PlayPauseButton) container.findViewById(R.id.radio_play_button);
         mPresetPlayButton = (PlayPauseButton) container.findViewById(R.id.preset_radio_play_button);

         mPresetsListButton = (ImageView) container.findViewById(R.id.radio_presets_list);
         mAddPresetsButton = (ImageView) container.findViewById(R.id.radio_add_presets_button);
     }

     /**
      * Sets this radio controller to display with a single box representing the current radio
      * station.
      */
     public void setSingleChannelDisplay(View container) {
         ViewStub stub = (ViewStub) container.findViewById(R.id.single_channel_view_stub);

         if (stub != null) {
             container = stub.inflate();
         }

         // Update references to the band and channel number.
         mChannelBand = (TextView) container.findViewById(R.id.radio_station_band);
         mChannelNumber = (TextView) container.findViewById(R.id.radio_station_channel);
     }

     /**
      * Sets this controller to display a list of channels that include the current radio station as
      * well as pre-scanned stations for the current band.
      */
     public void setChannelListDisplay(View container, PrescannedRadioStationAdapter adapter) {
         ViewStub stub = (ViewStub) container.findViewById(R.id.channel_list_view_stub);

         if (stub == null) {
             return;
         }

         mChannelList = (CarouselView) stub.inflate();
         mChannelList.setAdapter(adapter);

         Resources res = mContext.getResources();
         int topOffset = res.getDimensionPixelSize(R.dimen.lens_header_height)
                 + res.getDimensionPixelSize(R.dimen.car_radio_container_top_padding)
                 + res.getDimensionPixelSize(R.dimen.car_radio_station_top_margin);

         mChannelList.setTopOffset(topOffset);
     }

     /**
      * Set the given position as the radio station that should be be displayed first in the channel
      * list controlled by this class.
      */
     public void setCurrentStationInList(int position) {
         if (mChannelList != null) {
             mChannelList.shiftToPosition(position);
         }
     }

     /**
      * Returns the View that is responsible for rendering the play/pause state.
      */
     public View getPlayButton() {
         return mPlayButton;
     }

     /**
      * Set whether or not the buttons controlled by this controller are enabled. If {@code false}
      * is passed to this method, then no {@link View.OnClickListener}s will be
      * triggered when the buttons are pressed. In addition, the look of the button wil be updated
      * to reflect their disabled state.
      */
     public void setEnabled(boolean enabled) {
         // Color the buttons so that they are grey in appearance if they are disabled.
         int tint = enabled
                 ? mContext.getColor(R.color.car_radio_control_button)
                 : mContext.getColor(R.color.car_radio_control_button_disabled);

         if (mPlayButton != null) {
             // No need to tint the play button because its drawable already contains a disabled
             // state.
             mPlayButton.setEnabled(enabled);
         }

         if (mPresetPlayButton != null) {
             // No need to tint the play button because its drawable already contains a disabled
             // state.
             mPresetPlayButton.setEnabled(enabled);
         }

         if (mForwardSeekButton != null) {
             mForwardSeekButton.setEnabled(enabled);
             mForwardSeekButton.setColorFilter(tint);
         }

         if (mBackwardSeekButton != null) {
             mBackwardSeekButton.setEnabled(enabled);
             mBackwardSeekButton.setColorFilter(tint);
         }

         if (mPresetsListButton != null) {
             mPresetsListButton.setEnabled(enabled);
             mPresetsListButton.setColorFilter(tint);
         }

         if (mAddPresetsButton != null) {
             mAddPresetsButton.setEnabled(enabled);
             mAddPresetsButton.setColorFilter(tint);
         }
     }

     /**
      * Sets the {@link android.view.View.OnClickListener} for the backwards seek button.
      */
     public void setBackwardSeekButtonListener(View.OnClickListener listener) {
         if (mBackwardSeekButton != null) {
             mBackwardSeekButton.setOnClickListener(listener);
         }
     }

     /**
      * Sets the {@link android.view.View.OnClickListener} for the forward seek button.
      */
     public void setForwardSeekButtonListener(View.OnClickListener listener) {
         if (mForwardSeekButton != null) {
             mForwardSeekButton.setOnClickListener(listener);
         }
     }

     /**
      * Sets the {@link android.view.View.OnClickListener} for the play button. Clicking on this
      * button should toggle the radio from muted to un-muted.
      */
     public void setPlayButtonListener(View.OnClickListener listener) {
         if (mPlayButton != null) {
             mPlayButton.setOnClickListener(listener);
         }

         if (mPresetPlayButton != null) {
             mPresetPlayButton.setOnClickListener(listener);
         }
     }

     /**
      * Sets the {@link android.view.View.OnClickListener} for the button that will add the current
      * radio station to a list of stored presets.
      */
     public void setAddPresetButtonListener(View.OnClickListener listener) {
         if (mAddPresetsButton != null) {
             mAddPresetsButton.setOnClickListener(listener);
         }
     }

     /**
      * Sets the current radio channel (e.g. 88.5).
      */
     public void setChannelNumber(String channel) {
         if (mChannelNumber != null) {
             mChannelNumber.setText(channel);
         }
     }

     /**
      * Sets the radio channel band (e.g. FM).
      */
     public void setChannelBand(String channelBand) {
         if (mChannelBand != null) {
             mChannelBand.setText(channelBand);
             mChannelBand.setVisibility(
                     !TextUtils.isEmpty(channelBand) ? View.VISIBLE : View.GONE);
         }
     }

     /**
      * Sets the title of the currently playing song.
      */
     public void setCurrentSongTitle(String songTitle) {
         if (mCurrentSongTitle != null) {
             boolean isEmpty = TextUtils.isEmpty(songTitle);
             mCurrentSongTitle.setText(isEmpty ? null : songTitle.trim());
             mCurrentSongTitle.setVisibility(isEmpty ? View.GONE : View.VISIBLE);
         }
     }

     /**
      * Sets the artist(s) of the currently playing song or current radio station information
      * (e.g. KOIT).
      */
     public void setCurrentSongArtistOrStation(String songArtist) {
         if (mCurrentSongArtistOrStation != null) {
             boolean isEmpty = TextUtils.isEmpty(songArtist);
             mCurrentSongArtistOrStation.setText(isEmpty ? null : songArtist.trim());
             mCurrentSongArtistOrStation.setVisibility(isEmpty ? View.GONE : View.VISIBLE);
         }
     }

     /**
      * Sets the current state of the play button. If the given {@code muted} value is {@code true},
      * then the button display a play icon. If {@code false}, then the button will display a
      * pause icon.
      */
     public void setPlayPauseButtonState(boolean muted) {
         if (mPlayButton != null) {
             mPlayButton.setPlayState(muted
                     ? PlaybackState.STATE_PAUSED : PlaybackState.STATE_PLAYING);
             mPlayButton.refreshDrawableState();
         }

         if (mPresetPlayButton != null) {
             mPresetPlayButton.setPlayState(muted
                     ? PlaybackState.STATE_PAUSED : PlaybackState.STATE_PLAYING);
             mPresetPlayButton.refreshDrawableState();
         }
     }

     /**
      * Sets whether or not the current channel that is playing is a preset. If it is, then the
      * icon in {@link #mPresetsListButton} will be updatd to reflect this state.
      */
     public void setChannelIsPreset(boolean isPreset) {
         if (mAddPresetsButton != null) {
             mAddPresetsButton.setImageResource(isPreset
                     ? R.drawable.ic_star_filled
                     : R.drawable.ic_star_empty);
         }
     }
 }
	/*
	* 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.android.car.radio;

	import android.content.Context;
	import android.content.res.Resources;
	import android.media.session.PlaybackState;
	import android.text.TextUtils;
	import android.view.View;
	import android.view.ViewStub;
	import android.widget.ImageView;
	import android.widget.TextView;

	/**
	* Controller that controls the appearance state of various UI elements in the radio.
	*/
	public class RadioDisplayController {
	private final Context mContext;

	private TextView mChannelBand;
	private TextView mChannelNumber;

	private CarouselView mChannelList;

	private TextView mCurrentSongTitle;
	private TextView mCurrentSongArtistOrStation;

	private ImageView mBackwardSeekButton;
	private ImageView mForwardSeekButton;

	private PlayPauseButton mPlayButton;
	private PlayPauseButton mPresetPlayButton;

	private ImageView mPresetsListButton;
	private ImageView mAddPresetsButton;

	public RadioDisplayController(Context context) {
	mContext = context;
	}

	public void initialize(View container) {
	// Note that the band and channel number can exist without the stub
	// single_channel_view_stub. Refer to setSingleChannelDisplay() for more information.
	mChannelBand = (TextView) container.findViewById(R.id.radio_station_band);
	mChannelNumber = (TextView) container.findViewById(R.id.radio_station_channel);

	mCurrentSongTitle = (TextView) container.findViewById(R.id.radio_station_song);
	mCurrentSongArtistOrStation =
	(TextView) container.findViewById(R.id.radio_station_artist_or_station);

	mBackwardSeekButton = (ImageView) container.findViewById(R.id.radio_back_button);
	mForwardSeekButton = (ImageView) container.findViewById(R.id.radio_forward_button);

	mPlayButton = (PlayPauseButton) container.findViewById(R.id.radio_play_button);
	mPresetPlayButton = (PlayPauseButton) container.findViewById(R.id.preset_radio_play_button);

	mPresetsListButton = (ImageView) container.findViewById(R.id.radio_presets_list);
	mAddPresetsButton = (ImageView) container.findViewById(R.id.radio_add_presets_button);
	}

	/**
	* Sets this radio controller to display with a single box representing the current radio
	* station.
	*/
	public void setSingleChannelDisplay(View container) {
	ViewStub stub = (ViewStub) container.findViewById(R.id.single_channel_view_stub);

	if (stub != null) {
	container = stub.inflate();
	}

	// Update references to the band and channel number.
	mChannelBand = (TextView) container.findViewById(R.id.radio_station_band);
	mChannelNumber = (TextView) container.findViewById(R.id.radio_station_channel);
	}

	/**
	* Sets this controller to display a list of channels that include the current radio station as
	* well as pre-scanned stations for the current band.
	*/
	public void setChannelListDisplay(View container, PrescannedRadioStationAdapter adapter) {
	ViewStub stub = (ViewStub) container.findViewById(R.id.channel_list_view_stub);

	if (stub == null) {
	return;
	}

	mChannelList = (CarouselView) stub.inflate();
	mChannelList.setAdapter(adapter);

	Resources res = mContext.getResources();
	int topOffset = res.getDimensionPixelSize(R.dimen.lens_header_height)
	+ res.getDimensionPixelSize(R.dimen.car_radio_container_top_padding)
	+ res.getDimensionPixelSize(R.dimen.car_radio_station_top_margin);

	mChannelList.setTopOffset(topOffset);
	}

	/**
	* Set the given position as the radio station that should be be displayed first in the channel
	* list controlled by this class.
	*/
	public void setCurrentStationInList(int position) {
	if (mChannelList != null) {
	mChannelList.shiftToPosition(position);
	}
	}

	/**
	* Returns the View that is responsible for rendering the play/pause state.
	*/
	public View getPlayButton() {
	return mPlayButton;
	}

	/**
	* Set whether or not the buttons controlled by this controller are enabled. If {@code false}
	* is passed to this method, then no {@link View.OnClickListener}s will be
	* triggered when the buttons are pressed. In addition, the look of the button wil be updated
	* to reflect their disabled state.
	*/
	public void setEnabled(boolean enabled) {
	// Color the buttons so that they are grey in appearance if they are disabled.
	int tint = enabled
	? mContext.getColor(R.color.car_radio_control_button)
	: mContext.getColor(R.color.car_radio_control_button_disabled);

	if (mPlayButton != null) {
	// No need to tint the play button because its drawable already contains a disabled
	// state.
	mPlayButton.setEnabled(enabled);
	}

	if (mPresetPlayButton != null) {
	// No need to tint the play button because its drawable already contains a disabled
	// state.
	mPresetPlayButton.setEnabled(enabled);
	}

	if (mForwardSeekButton != null) {
	mForwardSeekButton.setEnabled(enabled);
	mForwardSeekButton.setColorFilter(tint);
	}

	if (mBackwardSeekButton != null) {
	mBackwardSeekButton.setEnabled(enabled);
	mBackwardSeekButton.setColorFilter(tint);
	}

	if (mPresetsListButton != null) {
	mPresetsListButton.setEnabled(enabled);
	mPresetsListButton.setColorFilter(tint);
	}

	if (mAddPresetsButton != null) {
	mAddPresetsButton.setEnabled(enabled);
	mAddPresetsButton.setColorFilter(tint);
	}
	}

	/**
	* Sets the {@link android.view.View.OnClickListener} for the backwards seek button.
	*/
	public void setBackwardSeekButtonListener(View.OnClickListener listener) {
	if (mBackwardSeekButton != null) {
	mBackwardSeekButton.setOnClickListener(listener);
	}
	}

	/**
	* Sets the {@link android.view.View.OnClickListener} for the forward seek button.
	*/
	public void setForwardSeekButtonListener(View.OnClickListener listener) {
	if (mForwardSeekButton != null) {
	mForwardSeekButton.setOnClickListener(listener);
	}
	}

	/**
	* Sets the {@link android.view.View.OnClickListener} for the play button. Clicking on this
	* button should toggle the radio from muted to un-muted.
	*/
	public void setPlayButtonListener(View.OnClickListener listener) {
	if (mPlayButton != null) {
	mPlayButton.setOnClickListener(listener);
	}

	if (mPresetPlayButton != null) {
	mPresetPlayButton.setOnClickListener(listener);
	}
	}

	/**
	* Sets the {@link android.view.View.OnClickListener} for the button that will add the current
	* radio station to a list of stored presets.
	*/
	public void setAddPresetButtonListener(View.OnClickListener listener) {
	if (mAddPresetsButton != null) {
	mAddPresetsButton.setOnClickListener(listener);
	}
	}

	/**
	* Sets the current radio channel (e.g. 88.5).
	*/
	public void setChannelNumber(String channel) {
	if (mChannelNumber != null) {
	mChannelNumber.setText(channel);
	}
	}

	/**
	* Sets the radio channel band (e.g. FM).
	*/
	public void setChannelBand(String channelBand) {
	if (mChannelBand != null) {
	mChannelBand.setText(channelBand);
	mChannelBand.setVisibility(
	!TextUtils.isEmpty(channelBand) ? View.VISIBLE : View.GONE);
	}
	}

	/**
	* Sets the title of the currently playing song.
	*/
	public void setCurrentSongTitle(String songTitle) {
	if (mCurrentSongTitle != null) {
	boolean isEmpty = TextUtils.isEmpty(songTitle);
	mCurrentSongTitle.setText(isEmpty ? null : songTitle.trim());
	mCurrentSongTitle.setVisibility(isEmpty ? View.GONE : View.VISIBLE);
	}
	}

	/**
	* Sets the artist(s) of the currently playing song or current radio station information
	* (e.g. KOIT).
	*/
	public void setCurrentSongArtistOrStation(String songArtist) {
	if (mCurrentSongArtistOrStation != null) {
	boolean isEmpty = TextUtils.isEmpty(songArtist);
	mCurrentSongArtistOrStation.setText(isEmpty ? null : songArtist.trim());
	mCurrentSongArtistOrStation.setVisibility(isEmpty ? View.GONE : View.VISIBLE);
	}
	}

	/**
	* Sets the current state of the play button. If the given {@code muted} value is {@code true},
	* then the button display a play icon. If {@code false}, then the button will display a
	* pause icon.
	*/
	public void setPlayPauseButtonState(boolean muted) {
	if (mPlayButton != null) {
	mPlayButton.setPlayState(muted
	? PlaybackState.STATE_PAUSED : PlaybackState.STATE_PLAYING);
	mPlayButton.refreshDrawableState();
	}

	if (mPresetPlayButton != null) {
	mPresetPlayButton.setPlayState(muted
	? PlaybackState.STATE_PAUSED : PlaybackState.STATE_PLAYING);
	mPresetPlayButton.refreshDrawableState();
	}
	}

	/**
	* Sets whether or not the current channel that is playing is a preset. If it is, then the
	* icon in {@link #mPresetsListButton} will be updatd to reflect this state.
	*/
	public void setChannelIsPreset(boolean isPreset) {
	if (mAddPresetsButton != null) {
	mAddPresetsButton.setImageResource(isPreset
	? R.drawable.ic_star_filled
	: R.drawable.ic_star_empty);
	}
	}
	}