001.package com.iutinvg.compass;
002.
003.
004.import android.content.Context;
005.import android.hardware.Sensor;
006.import android.hardware.SensorEvent;
007.import android.hardware.SensorEventListener;
008.import android.hardware.SensorManager;
009.import android.util.Log;
010.import android.view.LayoutInflater;
011.import android.view.View;
012.import android.view.animation.Animation;
013.import android.view.animation.RotateAnimation;
014.import android.widget.ImageView;
015.import android.widget.TextView;
016.
017.public class Compass implements SensorEventListener {
018. private static final String TAG = "Compass";
019.
020.
021. private SensorManager sensorManager;
022. private Sensor gsensor;
023. private Sensor msensor;
024. private float[] mGravity = new float[3];
025. private float[] mGeomagnetic = new float[3];
026. private float azimuth = 0f;
027. private float currectAzimuth = 0;
028.
029.
030. public ImageView arrowView = null;
031.
032. TextView tv;
033. public Compass(Context context) {
034. sensorManager = (SensorManager) context
035. .getSystemService(android.content.Context.SENSOR_SERVICE);
036. gsensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
037. msensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
038. LayoutInflater inflater = (LayoutInflater) context.getSystemService( Context.LAYOUT_INFLATER_SERVICE );
039. View v = inflater.inflate( R.layout.activity_compass, null );
040. tv = (TextView )v.findViewById(R.id.textView1);
041.
042. }
043.
044.
045. public void start() {
046. sensorManager.registerListener(this, gsensor,
047. SensorManager.SENSOR_DELAY_GAME);
048. sensorManager.registerListener(this, msensor,
049. SensorManager.SENSOR_DELAY_GAME);
050. }
051.
052. public void stop() {
053. sensorManager.unregisterListener(this);
054. }
055.
056. private void adjustArrow() {
057. if (arrowView == null) {
058. Log.i(TAG, "arrow view is not set");
059. return;
060. }
061.
062. Log.i(TAG, "will set rotation from " + currectAzimuth + " to "
063. + azimuth);
064.
065. Animation an = new RotateAnimation(-currectAzimuth, -azimuth,
066. Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
067. 0.5f);
068. currectAzimuth = azimuth;
069.
070. an.setDuration(500);
071. an.setRepeatCount(0);
072. an.setFillAfter(true);
073.
074. arrowView.startAnimation(an);
075. }
076.
077. @Override
078. public void onSensorChanged(SensorEvent event) {
079.
080.
081. final float alpha = 0.97f;
082.
083. synchronized (this) {
084. if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
085.
086. mGravity[0] = alpha * mGravity[0] + (1 - alpha)
087. * event.values[0];
088. mGravity[1] = alpha * mGravity[1] + (1 - alpha)
089. * event.values[1];
090. mGravity[2] = alpha * mGravity[2] + (1 - alpha)
091. * event.values[2];
092.
093.
094.
095.
096. }
097.
098. if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
099.
100.
101. mGeomagnetic[0] = alpha * mGeomagnetic[0] + (1 - alpha)
102. * event.values[0];
103. mGeomagnetic[1] = alpha * mGeomagnetic[1] + (1 - alpha)
104. * event.values[1];
105. mGeomagnetic[2] = alpha * mGeomagnetic[2] + (1 - alpha)
106. * event.values[2];
107.
108.
109. }
110.
111. float R[] = new float[9];
112. float I[] = new float[9];
113. boolean success = SensorManager.getRotationMatrix(R, I, mGravity,
114. mGeomagnetic);
115. if (success) {
116. float orientation[] = new float[3];
117. SensorManager.getOrientation(R, orientation);
118.
119. azimuth = (float) Math.toDegrees(orientation[0]);
120. azimuth = (azimuth + 360) % 360;
121.
122.
123.
124.
125. adjustArrow();
126. }
127. }
128. }
129.
130.
131. @Override
132. public void onAccuracyChanged(Sensor sensor, int accuracy) {
133.
134.
135. }
136.}
