image.png

代码

package com.example.sensor_text;

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.widget.TextView;

import com.example.sensot_text.R;

public class MainActivity extends Activity {

    private SensorManager systemService;
    mylist lisn;
    private TextView textView_text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView_text = (TextView) findViewById(R.id.TextView_text);
        // 得到传感器服务(转换成传感器管理者)
        systemService = (SensorManager) this.getSystemService(SENSOR_SERVICE);
        // 获取所有传感器
        // List<Sensor> sensorList =
        // systemService.getSensorList(Sensor.TYPE_ALL);//获取全部传感器
        // for (Sensor sensor : sensorList) {
        // Log.e("tag", sensor.getName());
        // }
        // 获得方向传感器
        Sensor defaultSensor = systemService
                .getDefaultSensor(Sensor.TYPE_LIGHT);
        // TYPE_LIGHT=5光线
        // 3是方向
        // 1监听改变器,2是传感器3,采样率
        lisn = new mylist();
        systemService.registerListener(lisn, defaultSensor,
                SensorManager.SENSOR_DELAY_NORMAL);
    }

    public class mylist implements SensorEventListener {
        // 当传感器数据变化的调用方法
        @Override
        public void onSensorChanged(SensorEvent event) {
            // TODO Auto-generated method stub
            float f = event.values[0];
            Log.e("tag", "光线" + f);
            textView_text.setText("光线" + f);
            // int f = (int) event.values[0];
            // if(f>0&&f<90){
            // textView_text.setText("东北");
            // Log.e("tag", "东北");
            // }else if(f>90&&f<180){
            // textView_text.setText("东南");
            // Log.e("tag", "东南");
            // }

        }

        // 当传感器精度传感器(信号)
        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        systemService.unregisterListener(lisn);
        lisn = null;
        super.onDestroy();
    }
}

重要的一句话

systemService.registerListener(lisn, defaultSensor,
                SensorManager.SENSOR_DELAY_NORMAL);