感應器的型別為 Sensor.TYPE_MAGNETIC_FIELD，用法同其他感應器。
main.xml
<LinearLayout xmlns:android="HTTP://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
MagneticActivity
public class MagneticActivity extends Activity implements SensorEventListener {
private static final String TAG = "MagneticActivity";
private SensorManager sensorMgr;
private Sensor sensor;
private TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.insert2Tv("onCreate...");
this.sensorMgr = (SensorManager) this.getSystemService(SENSOR_SERVICE);
List<Sensor> list = this.sensorMgr.getSensorList(Sensor.TYPE_MAGNETIC_FIELD);
if (list.isEmpty()) {
this.insert2Tv("不支援地磁感應器");
}
else {
this.sensor = list.get(0);
this.insert2Tv("找到地磁感應器：" + this.sensor.getName());
}
this.insert2Tv("onCreated");
}
@Override
protected void onPause() {
super.onPause();
if (this.sensor != null) {
this.insert2Tv("unregisterListener...");
this.sensorMgr.unregisterListener(this, this.sensor);
}
}
@Override
protected void onResume() {
super.onResume();
if (this.sensor != null) {
this.insert2Tv("registerListener...");
this.sensorMgr.registerListener(this, this.sensor,
SensorManager.SENSOR_DELAY_NORMAL);
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
@Override
public void onSensorChanged(SensorEvent event) {
this.insert2Tv("目前地磁方向：X - " + event.values[0] + ", Y - "
+ event.values[1] + ", Z - " + event.values[2]);
}
private void insert2Tv(String msg) {
if (this.tv == null) {
this.tv = (TextView) this.findViewById(R.id.tv);
}
this.tv.setText(msg + "\n" + this.tv.getText().toString());
Log.d(TAG, msg);
}
}
地磁感應器要
安裝到手機上才會運作。
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