使用加速度計確定你的裝置是否靜止

將以下程式碼新增到 onCreate() / onResume() 方法:

SensorManager sensorManager;
Sensor mAccelerometer;
final float movementThreshold = 0.5f;  // You may have to change this value.
boolean isMoving = false;
float[] prevValues = {1.0f, 1.0f, 1.0f};
float[] currValues = new float[3];

sensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
mAccelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);

你可能必須通過試驗和錯誤調整 movementThreshold 來調整靈敏度。然後,覆蓋 onSensorChanged() 方法,如下所示:

@Override
public void onSensorChanged(SensorEvent event) {
    if (event.sensor == mAccelerometer) {
        System.arraycopy(event.values, 0, currValues, 0, event.values.length);
        if ((Math.abs(currValues[0] - prevValues[0]) > movementThreshold) ||
                (Math.abs(currValues[1] - prevValues[1]) > movementThreshold) ||
                (Math.abs(currValues[2] - prevValues[2]) > movementThreshold)) {
            isMoving = true;
        } else {
            isMoving = false;
        }
        System.arraycopy(currValues, 0, prevValues, 0, currValues.length);
    }       
}

如果要阻止將應用程式安裝在沒有加速計的裝置上,則必須在清單中新增以下行:

<uses-feature android:name="android.hardware.sensor.accelerometer" />