Android Open Source - android-music-player Library Activity

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Back to project page android-music-player.

License

The source code is released under:

GNU General Public License

Java Source Code

package pconley.vamp;
/*from  w  w  w.  j  ava2s .  c om*/
import java.io.File;
import java.util.List;

import pconley.vamp.db.TrackDAO;
import pconley.vamp.player.PlayerEvents;
import pconley.vamp.player.PlayerService;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

/**
 * Main activity, showing the contents of the library.
 */
public class LibraryActivity extends Activity {

  private ListView trackListView;

  /*
   * Receive status messages from the player
   */
  private BroadcastReceiver playerEventReceiver;

  private static final String trackName = "sample_1.m4a";

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_library);

    playerEventReceiver = new BroadcastReceiver() {

      @Override
      public void onReceive(Context context, Intent intent) {

        if (intent.hasExtra(PlayerEvents.EXTRA_MESSAGE)) {
          Toast.makeText(LibraryActivity.this,
              intent.getStringExtra(PlayerEvents.EXTRA_MESSAGE),
              Toast.LENGTH_LONG).show();
        }

      }
    };

    new LoadTrackListTask().execute(false);

    trackListView = (ListView) findViewById(R.id.track_list);
    trackListView.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(AdapterView<?> parent, View view,
          int position, long id) {

        Intent intent = new Intent(LibraryActivity.this,
            TrackViewActivity.class);
        intent.putExtra(TrackViewActivity.EXTRA_ID,
            (long) parent.getItemAtPosition(position));
        startActivity(intent);
      }
    });
  }

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

    LocalBroadcastManager.getInstance(this).registerReceiver(
        playerEventReceiver,
        new IntentFilter(PlayerEvents.FILTER_PLAYER_EVENT));

  }

  @Override
  protected void onPause() {
    LocalBroadcastManager.getInstance(this).unregisterReceiver(
        playerEventReceiver);

    super.onPause();
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.library, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    switch (item.getItemId()) {
    case R.id.action_player:
      if (launchPlayer()) {
        startActivity(new Intent(this, CurrentTrackActivity.class));
      }
      return true;
    default:
      return super.onOptionsItemSelected(item);
    }
  }

  /**
   * Delete the contents of the library and replace it with sample contents.
   *
   * TODO: delete this (and the contents of the library) when I can read the
   * real thing.
   *
   * @param view
   *            The origin of the rebuild request
   */
  public void createLibrary(View view) {
    new LoadTrackListTask().execute(true);
  }

  /*
   * Start the music player with a single track. Returns false if the track
   * didn't exist.
   */
  private boolean launchPlayer() {
    File track = new File(
        Environment
            .getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC),
        trackName);

    if (!track.exists()) {
      Log.w("Library", "Missing track " + track);
      Toast.makeText(this, "Missing track " + track, Toast.LENGTH_LONG)
          .show();
      return false;
    }

    Intent intent = new Intent(this, PlayerService.class).setAction(
        PlayerService.ACTION_PLAY).setData(Uri.fromFile(track));
    startService(intent);

    return true;
  }

  /*
   * Load the contents of the library into a TextView with execute(). Work is
   * done in a background thread; the task displays a progress bar while
   * working.
   * 
   * The library is first deleted and rebuilt if `LoadTrackListTask.execute`
   * is called with a true parameter.
   */
  private class LoadTrackListTask extends
      AsyncTask<Boolean, Void, List<Long>> {

    @Override
    protected List<Long> doInBackground(Boolean... params) {
      // Create a sample library.
      if (params.length > 0 && params[0] == true) {
        try {
          TrackDAO.createSampleLibrary(LibraryActivity.this);
        } catch (Exception e) {
          Log.w("Library", e.getMessage());
        }
      }

      return new TrackDAO(LibraryActivity.this).getIds();
    }

    protected void onPostExecute(List<Long> ids) {
      ArrayAdapter<Long> adapter = new ArrayAdapter<Long>(
          LibraryActivity.this, R.layout.track_list_item,
          R.id.track_list_item, ids);

      trackListView.setAdapter(adapter);
    }

  }

}

Java Source Code List

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