Question

我正在尝试使用Android中的SensorManager获取环境空气温度。在下面的代码中，我有一个按钮单击事件，对于每个按钮单击，我想在textview中获取环境空气温度。以下代码仅返回传感器信息。我应该包括哪些代码行以获取环境空气温度？

public class MainActivity extends AppCompatActivity implements SensorEventListener {

private SensorManager sensorManager;
private float temperature;

//TextView txtT;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //thermometer = (Thermometer) findViewById(R.id.thermometer);
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

    final TextView txtT = (TextView) findViewById(R.id.textTemp);

    Button getButton = (Button) findViewById(R.id.button_get);

    getButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE);
            txtT.setText(sensor.toString());

        }
    });
}


@Override
public void onSensorChanged(SensorEvent event) {

}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

}
}

Answer 1

传感器环境温度仅存在于Galaxy S4和注3中。我不知道与此传感器一起发布的任何其他智能手机。除非您拥有我列出的某些手机，否则很可能不会从该传感器获取任何值。我们的设备具有电池温度计和CPU温度计，但是它们的数据不能用作环境温度计的数据。

您可以在onsensorchanged功能中接收传感器事件值。您缺少为传感器注册侦听器，以及从onsensorchanged函数检索数据的过程。

public class MainActivity extends AppCompatActivity implements SensorEventListener {

    private SensorManager sensorManager;
    private float temperature;

//TextView txtT;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //thermometer = (Thermometer) findViewById(R.id.thermometer);
        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

    //    final TextView txtT = (TextView) findViewById(R.id.textTemp);

//        Button getButton = (Button) findViewById(R.id.button_get);

  //      getButton.setOnClickListener(new View.OnClickListener() {
    //        @Override
      //      public void onClick(View v) {



        sensorManager.registerListener(this, sensorManager
                        .getDefaultSensor(Sensor.TYPE_AMBIENT_TEMPERATURE),
                SensorManager.SENSOR_DELAY_FASTEST);

        //      txtT.setText(sensor.toString());

          //  }
      //  });
    }


    @Override
    public void onSensorChanged(SensorEvent event) {
        temperature = event.values[0];
        System.out.println("Temperature " + temperature);

    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }


}

如何使用SensorManager获取环境空气温度？

1 个答案: