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POHow to get Context from SherlockFragment and start Activity
 

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  1. POHow to get Context from SherlockFragment and start Activity
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    <p>Im using swipable tabs actionbar Sherlock and In one of my tabs I have it pointed to an xml file for its content.... there is a button "btnPlaylist" which is supposed to open a new activity/intent but the highlighted error is on "context" saying it cannot be resolved into a variable.</p> <p>heres the code</p> <pre><code>public class Playback extends SherlockFragment implements OnCompletionListener, SeekBar.OnSeekBarChangeListener { private ImageButton btnPlay; private ImageButton btnForward; private ImageButton btnBackward; private ImageButton btnNext; private ImageButton btnPlaylist; private ImageButton btnPrevious; private ImageButton btnRepeat; private ImageButton btnShuffle; private SeekBar songProgressBar; private TextView songTitleLabel; private TextView songCurrentDurationLabel; private TextView songTotalDurationLabel; // Media Player private MediaPlayer mp; // Handler to update UI timer, progress bar etc,. private Handler mHandler = new Handler();; private SongsManager songManager; private Utilities utils; private int seekForwardTime = 5000; // 5000 milliseconds private int seekBackwardTime = 5000; // 5000 milliseconds private int currentSongIndex = 0; private boolean isShuffle = false; private boolean isRepeat = false; private ArrayList&lt;HashMap&lt;String, String&gt;&gt; songsList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); @Override public SherlockFragmentActivity getSherlockActivity() { return super.getSherlockActivity(); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.player, container, false); btnPlay = (ImageButton) view.findViewById(R.id.btnPlay); btnForward = (ImageButton) view.findViewById(R.id.btnForward); btnBackward = (ImageButton) view.findViewById(R.id.btnBackward); btnNext = (ImageButton) view.findViewById(R.id.btnNext); btnPrevious = (ImageButton) view.findViewById(R.id.btnPrevious); btnPlaylist = (ImageButton) view.findViewById(R.id.btnPlaylist); btnRepeat = (ImageButton) view.findViewById(R.id.btnRepeat); btnShuffle = (ImageButton) view.findViewById(R.id.btnShuffle); songProgressBar = (SeekBar) view.findViewById(R.id.songProgressBar); songTitleLabel = (TextView) view.findViewById(R.id.songTitle); songCurrentDurationLabel = (TextView) view.findViewById(R.id.songCurrentDurationLabel); songTotalDurationLabel = (TextView) view.findViewById(R.id.songTotalDurationLabel); mp = new MediaPlayer(); songManager = new SongsManager(); utils = new Utilities(); // Listeners songProgressBar.setOnSeekBarChangeListener(this); // Important mp.setOnCompletionListener(this); // Important // Getting all songs list songsList = songManager.getPlayList(); // By default play first song playSong(0); /** * Play button click event * plays a song and changes button to pause image * pauses a song and changes button to play image * */ btnPlay.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // check for already playing if(mp.isPlaying()){ if(mp!=null){ mp.pause(); // Changing button image to play button btnPlay.setImageResource(R.drawable.btn_play); } }else{ // Resume song if(mp!=null){ mp.start(); // Changing button image to pause button btnPlay.setImageResource(R.drawable.btn_pause); } } } }); /** * Forward button click event * Forwards song specified seconds * */ btnForward.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // get current song position int currentPosition = mp.getCurrentPosition(); // check if seekForward time is lesser than song duration if(currentPosition + seekForwardTime &lt;= mp.getDuration()){ // forward song mp.seekTo(currentPosition + seekForwardTime); }else{ // forward to end position mp.seekTo(mp.getDuration()); } } }); /** * Backward button click event * Backward song to specified seconds * */ btnBackward.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // get current song position int currentPosition = mp.getCurrentPosition(); // check if seekBackward time is greater than 0 sec if(currentPosition - seekBackwardTime &gt;= 0){ // forward song mp.seekTo(currentPosition - seekBackwardTime); }else{ // backward to starting position mp.seekTo(0); } } }); /** * Next button click event * Plays next song by taking currentSongIndex + 1 * */ btnNext.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // check if next song is there or not if(currentSongIndex &lt; (songsList.size() - 1)){ playSong(currentSongIndex + 1); currentSongIndex = currentSongIndex + 1; }else{ // play first song playSong(0); currentSongIndex = 0; } } }); /** * Back button click event * Plays previous song by currentSongIndex - 1 * */ btnPrevious.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { if(currentSongIndex &gt; 0){ playSong(currentSongIndex - 1); currentSongIndex = currentSongIndex - 1; }else{ // play last song playSong(songsList.size() - 1); currentSongIndex = songsList.size() - 1; } } }); /** * Button Click event for Repeat button * Enables repeat flag to true * */ btnRepeat.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(isRepeat){ isRepeat = false; //Toast.makeText(this, "Repeat is OFF", Toast.LENGTH_SHORT).show(); btnRepeat.setImageResource(R.drawable.btn_repeat); }else{ // make repeat to true isRepeat = true; //Toast.makeText(getApplicationContext(), "Repeat is ON", Toast.LENGTH_SHORT).show(); // make shuffle to false isShuffle = false; btnRepeat.setImageResource(R.drawable.btn_repeat_focused); btnShuffle.setImageResource(R.drawable.btn_shuffle); } } }); /** * Button Click event for Shuffle button * Enables shuffle flag to true * */ btnShuffle.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { if(isShuffle){ isShuffle = false; //Toast.makeText(getApplicationContext(), "Shuffle is OFF", Toast.LENGTH_SHORT).show(); btnShuffle.setImageResource(R.drawable.btn_shuffle); }else{ // make repeat to true isShuffle= true; //Toast.makeText(getApplicationContext(), "Shuffle is ON", Toast.LENGTH_SHORT).show(); // make shuffle to false isRepeat = false; btnShuffle.setImageResource(R.drawable.btn_shuffle_focused); btnRepeat.setImageResource(R.drawable.btn_repeat); } } }); /** * Button Click event for Play list click event * Launches list activity which displays list of songs * */ btnPlaylist.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { Intent i = new Intent(context, PlayListActivity.class); } }); return view; } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); setUserVisibleHint(true); } /** * Receiving song index from playlist view * and play the song * */ @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(resultCode == 100){ currentSongIndex = data.getExtras().getInt("songIndex"); // play selected song playSong(currentSongIndex); } } /** * Function to play a song * @param songIndex - index of song * */ public void playSong(int songIndex){ // Play song try { mp.reset(); mp.setDataSource(songsList.get(songIndex).get("songPath")); mp.prepare(); mp.start(); // Displaying Song title String songTitle = songsList.get(songIndex).get("songTitle"); songTitleLabel.setText(songTitle); // Changing Button Image to pause image btnPlay.setImageResource(R.drawable.btn_pause); // set Progress bar values songProgressBar.setProgress(0); songProgressBar.setMax(100); // Updating progress bar updateProgressBar(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * Update timer on seekbar * */ public void updateProgressBar() { mHandler.postDelayed(mUpdateTimeTask, 100); } /** * Background Runnable thread * */ private Runnable mUpdateTimeTask = new Runnable() { public void run() { long totalDuration = mp.getDuration(); long currentDuration = mp.getCurrentPosition(); // Displaying Total Duration time songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration)); // Displaying time completed playing songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration)); // Updating progress bar int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration)); //Log.d("Progress", ""+progress); songProgressBar.setProgress(progress); // Running this thread after 100 milliseconds mHandler.postDelayed(this, 100); } }; /** * * */ @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) { } /** * When user starts moving the progress handler * */ @Override public void onStartTrackingTouch(SeekBar seekBar) { // remove message Handler from updating progress bar mHandler.removeCallbacks(mUpdateTimeTask); } /** * When user stops moving the progress hanlder * */ @Override public void onStopTrackingTouch(SeekBar seekBar) { mHandler.removeCallbacks(mUpdateTimeTask); int totalDuration = mp.getDuration(); int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration); // forward or backward to certain seconds mp.seekTo(currentPosition); // update timer progress again updateProgressBar(); } /** * On Song Playing completed * if repeat is ON play same song again * if shuffle is ON play random song * */ @Override public void onCompletion(MediaPlayer arg0) { // check for repeat is ON or OFF if(isRepeat){ // repeat is on play same song again playSong(currentSongIndex); } else if(isShuffle){ // shuffle is on - play a random song Random rand = new Random(); currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0; playSong(currentSongIndex); } else{ // no repeat or shuffle ON - play next song if(currentSongIndex &lt; (songsList.size() - 1)){ playSong(currentSongIndex + 1); currentSongIndex = currentSongIndex + 1; }else{ // play first song playSong(0); currentSongIndex = 0; } } } @Override public void onDestroy(){ super.onDestroy(); mp.release(); } } </code></pre>
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    1. USPhilipp Jahoda
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