【android】：android之传感器的使用

àì夳堔傛蜴生んèń 2022-09-21 13:18 138阅读 0赞

android使用传感器大致就几种，然后方法是用textview控件接住传感器获得的数据，然后用onSensorChanged事件去感测传感器数据的变化，进而获得数据值的更新

大致代码如下，xml文件就一个TextView即可，创建的类继承Activity，然后在onCreate函数里面创建相应的传感器，然后设置一个对于传感器的监听即可

代码如下，如果小伙伴发现不好使，请及时与我联系

public class MainActivity extends Activity { 
        private SensorManager sensorManager; //注意
        private TextView text;            //注意要声明
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            text = (TextView) findViewById(R.id.textview);
            sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); //获得Sensor_service
            Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);//选定为光传感器
            sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL); //设置监听
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            if (sensorManager != null) {
                    sensorManager.unregisterListener(listener);
            }
        }
    
        private SensorEventListener listener = new SensorEventListener() {
                @Override
                public void onSensorChanged(SensorEvent event) {
                    // values数组中第一个下标的值就是当前的光照强度
                    float value = event.values[0];
                    text.setText("Current light level is " + value + " lx");
                }
                @Override       
                public void onAccuracyChanged(Sensor sensor, int accuracy) {
    
                }
        };
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }
    
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // Handle action bar item clicks here. The action bar will
            // automatically handle clicks on the Home/Up button, so long
            // as you specify a parent activity in AndroidManifest.xml.
            int id = item.getItemId();
            if (id == R.id.action_settings) {
                return true;
            }
            return super.onOptionsItemSelected(item);
        }
    }
        }