我正在尝试构建一个应用程序,用于读取手机上加速度计的值,该应用仅支持Android 2.1。
如何使用兼容2.1的代码读取加速度计?
答案 0 :(得分:45)
从这开始:
public class yourActivity extends Activity implements SensorEventListener{
private SensorManager sensorManager;
double ax,ay,az; // these are the acceleration in x,y and z axis
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
sensorManager=(SensorManager) getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType()==Sensor.TYPE_ACCELEROMETER){
ax=event.values[0];
ay=event.values[1];
az=event.values[2];
}
}
}
答案 1 :(得分:31)
这在几段中不容易解释。您应该尝试阅读:
这些展示了如何访问传感器的框架:
public class SensorActivity extends Activity implements SensorEventListener {
private final SensorManager mSensorManager;
private final Sensor mAccelerometer;
public SensorActivity() {
mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
}
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
public void onSensorChanged(SensorEvent event) {
}
}
在onSensorChanged
回调中,您可以通过SensorEvent
查询传感器的值。
答案 2 :(得分:7)