Android Open Source - Smartlab Compass View

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License

The source code is released under:

Apache License

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Java Source Code

package com.example.compassview;
// w w w  .  j  a v  a 2s  .c o m
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.util.AttributeSet;
import android.widget.ImageView;

public class CompassView extends ImageView implements SensorListener {

  private int direction = 0;
  private Paint paint;
  private SensorManager sensorManager;

  public CompassView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    paint = new Paint();
    paint.setColor(Color.WHITE);
    paint.setStrokeWidth(2);
    paint.setStyle(Style.STROKE);

    sensorManager = (SensorManager) context
        .getSystemService(Context.SENSOR_SERVICE);
    sensorManager
        .registerListener(this, SensorManager.SENSOR_ACCELEROMETER);

    setImageResource(R.drawable.compass);
  }

  public CompassView(Context context, AttributeSet attrs) {
    this(context, attrs, -1);
  }

  public CompassView(Context context) {
    this(context, null, -1);
  }

  @Override
  protected void onDraw(Canvas canvas) {
    int height = this.getHeight();
    int width = this.getWidth();

    canvas.rotate(direction, width / 2, height / 2);
    super.onDraw(canvas);
  }

  public interface CompassListener {
    public void onCompassChanged(CompassView compassView, int data);
  }

  CompassListener compassListener;

  public void setOnCompassListener(CompassListener listener) {
    compassListener = listener;
  }

  @Override
  public void onAccuracyChanged(int arg0, int arg1) {
  }

  @Override
  public void onSensorChanged(int sensor, float[] values) {
    if (sensor != SensorManager.SENSOR_ACCELEROMETER)
      return;
    this.direction = (int) values[0];
    invalidate();
    
    if( compassListener != null) {
      compassListener.onCompassChanged(this, direction);
    }
  }

}

Java Source Code List