Android Open Source - greeter-android Main Activity

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCT...

Java Source Code

package pala.co.greeter;
//from w ww  .j a  v a  2 s.c om
import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.graphics.Color;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.widget.TextView;

import java.io.IOException;
import java.util.Random;

public class MainActivity extends Activity implements SensorEventListener {

  private static final int COLOR_HAPPY = Color.GREEN;
  private static final int COLOR_SCARED = Color.RED;

  private static final int[] SOUND_RESOURCE_IDS = new int[]{
      R.raw.hello1,
      R.raw.hello2,
      R.raw.hello3,
      R.raw.hello4
  };

  private TextView mTextView;

  private SensorManager mSensorManager;
  private MediaPlayer mMediaPlayer;

  private boolean mSoundPlayed = false;

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

    mTextView = (TextView)findViewById(android.R.id.primary);
    mTextView.setTextColor(COLOR_SCARED);

    mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);

    final Sensor sensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
    if(sensor != null) {
      mSensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_UI);
    }

    createSound();
  }

  @Override
  protected void onDestroy() {
    mSensorManager.unregisterListener(this);

    destroySound();

    super.onDestroy();
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
    final float lightLevel = event.values[0];

    mTextView.setText(String.format("%.0f lux", lightLevel));

    if(lightLevel < 50.0f) {
      mTextView.setTextColor(COLOR_SCARED);

      stopSound();
    } else {
      mTextView.setTextColor(COLOR_HAPPY);

      playSound();
    }
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
  }

  private static int randomSoundResId() {
    final int index = new Random().nextInt(SOUND_RESOURCE_IDS.length);

    return SOUND_RESOURCE_IDS[index];
  }

  private void createSound() {
    mMediaPlayer = MediaPlayer.create(this, randomSoundResId());
  }

  private void destroySound() {
    mMediaPlayer.release();
  }

  private void playSound() {
    if(!mSoundPlayed) {
      mSoundPlayed = true;

      mMediaPlayer.start();
    }
  }

  private void stopSound() {
    if(mSoundPlayed) {
      mSoundPlayed = false;

      mMediaPlayer.stop();
      AssetFileDescriptor afd = getResources().openRawResourceFd(randomSoundResId());

      mMediaPlayer.reset();
      try {
        mMediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
        afd.close();
        mMediaPlayer.prepare();
      } catch(IOException e) {
        e.printStackTrace();
      }
    }
  }
}

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