Question

我的活动实施SensorEventListener，我将sensorManager注册到三个传感器：

// register all the sensors
    if (sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) != null) {
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
    }

    if (sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE) != null) {
        gyroscope = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
        sensorManager.registerListener(this, gyroscope, SensorManager.SENSOR_DELAY_NORMAL);
    }

    if (sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD) != null) {
        magnetometer = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
        sensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_NORMAL);
    }

我还在onResume（）和onPause（）中注册和注销了传感器管理器。

我有一个方法saveData，可以检测所有传感器更改并写入文件。

我使用了以下方法：Is there a way to retrieve multiple sensor data in Android

@Override
public void onSensorChanged(SensorEvent event) {
    Sensor sensor = event.sensor;

    currentTime = System.currentTimeMillis();

    if (currentTime >= startTime && currentTime <= endTime) {
        if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            ax = event.values[0];
            ay = event.values[1];
            az = event.values[2];

        } else if (sensor.getType() == Sensor.TYPE_GYROSCOPE) {
            gx = event.values[0];
            gy = event.values[1];
            gz = event.values[2];
        } else if (sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
            mx = event.values[0];
            my = event.values[1];
            mz = event.values[2];
        }


        content += (currentTime - startTime) + ax + " " + ay + " " + az + " " + mx + " " + my + " " + mz + " " + gx + " " + gy + " " + gz + "\n";
    }

}

我的文件保存方法：

 try {
        file = new File(Environment.getExternalStorageDirectory(), filename);

        fileOutputStream = new FileOutputStream(file);
        fileOutputStream.write(title.getBytes());
        fileOutputStream.write(content.getBytes());
        fileOutputStream.close();

    } catch (IOException e) {

但问题是内容变量根本不会改变。是因为所有传感器都在同时变化吗？如何实际检索数据到内容并写入文件？

Android：如何检索多个传感器数据并检测更改

0 个答案: