Android Open Source - android-compass Android Compass Activity

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License

The source code is released under:

Apache License

Java Source Code

package com.jwetherell.compass;
//  w ww  .j  ava2s .  c om
import com.jwetherell.compass.data.GlobalData;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.os.Bundle;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.util.Log;
import android.view.View;
import android.widget.TextView;


/**
 * This class extends the SensorsActivity and is designed tie the CompassView
 * and Sensors together.
 * 
 * @author Justin Wetherell <phishman3579@gmail.com>
 */
public class AndroidCompassActivity extends SensorsActivity {

    private static final String TAG = "AndroidCompassActivity";

    private static WakeLock wakeLock = null;

    private static TextView text = null;
    private static View compassView = null;

    /**
     * {@inheritDoc}
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.i(TAG, "onCreate()");

        setContentView(R.layout.main);

        text = (TextView) findViewById(R.id.text);
        compassView = findViewById(R.id.compass);

        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "DoNotDimScreen");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "onDestroy()");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onStart() {
        super.onStart();
        Log.i(TAG, "onStart()");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onStop() {
        super.onStop();
        Log.i(TAG, "onStop()");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onResume() {
        super.onResume();
        Log.i(TAG, "onResume()");

        wakeLock.acquire();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onPause() {
        super.onPause();
        Log.i(TAG, "onPause()");

        wakeLock.release();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onSensorChanged(SensorEvent evt) {
        super.onSensorChanged(evt);

        if (evt.sensor.getType() == Sensor.TYPE_ACCELEROMETER || evt.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
            // Tell the compass to update it's graphics
            if (compassView != null) compassView.postInvalidate();
        }

        // Update the direction text
        updateText(GlobalData.getBearing());
    }

    private static void updateText(float bearing) {
        int range = (int) (bearing / (360f / 16f));
        String dirTxt = "";
        if (range == 15 || range == 0) dirTxt = "N";
        else if (range == 1 || range == 2) dirTxt = "NE";
        else if (range == 3 || range == 4) dirTxt = "E";
        else if (range == 5 || range == 6) dirTxt = "SE";
        else if (range == 7 || range == 8) dirTxt = "S";
        else if (range == 9 || range == 10) dirTxt = "SW";
        else if (range == 11 || range == 12) dirTxt = "W";
        else if (range == 13 || range == 14) dirTxt = "NW";
        text.setText("" + ((int) bearing) + ((char) 176) + " " + dirTxt);
    }
}

Java Source Code List

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