陀螺儀on android

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

private static final String TAG = "gyroscopedemo";
private SensorManager sensorManager;
private TextView tvMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        findViews();
    }
   
    private void findViews() {
        tvMessage = (TextView) findViewById(R.id.tvMessage);
    }
   
   // 重點就是這個  listener , type 是 SensorEventListener()

    SensorEventListener listener = new SensorEventListener() {
        public void onSensorChanged(SensorEvent event) {
            Sensor sensor = event.sensor;
            String sensorInfo = "";
            sensorInfo += "sensor name: " + sensor.getName() + "\n";
            sensorInfo += "sensor type: " + sensor.getType() + "\n";
            sensorInfo += "used power: " + sensor.getPower() + " mA\n";
            sensorInfo += "values: \n";
            float[] values = event.values; //  資料都在這裡面
            for (int i = 0; i < values.length; i++) {
                                                                       // 把弧度改成角度....
                sensorInfo += "-values[" + i + "] = " + Math.toDegrees(values[i]) + "\n";
            }
            tvMessage.setText(sensorInfo);
        }

        public void onAccuracyChanged(Sensor sensor, int accuracy) {
            // Called when the accuracy of a sensor has changed.
        }
    };
   

//  註冊一個listener... 當sensor產生變化的時候就呼叫這個listener...
   
    @Override
    protected void onResume() {
        super.onResume();
        boolean enable = sensorManager.registerListener(listener,
                sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE), // 選擇陀螺儀
                SensorManager.SENSOR_DELAY_UI);
        if (!enable) {
            sensorManager.unregisterListener(listener); // 如果註冊不成功...就把這個listener 取消
            Log.e(TAG, getString(R.string.msg_SensorNotSupported));
        }
    }
   
    @Override
    protected void onPause() {
        super.onPause();
        sensorManager.unregisterListener(listener);
    }

   
}