我是Android中传感器使用的新手,现在有点困惑。我只有在发生明显的光变化时才需要执行某些操作,例如灯在黑暗的房间里打开了。到目前为止,我有一个非常简单的默认实现。我怎么能告诉系统我只想对重大的光变化作出反应?
public class MainActivity extends Activity implements SensorEventListener {
private SensorManager mSensorManager;
private Sensor mLight;
private RelativeLayout mLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
mLight = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
mLayout = (RelativeLayout) findViewById(R.id.mLayout);
mLayout.setKeepScreenOn(true);
}
@Override
protected void onResume() {
mSensorManager.registerListener(this, mLight,
SensorManager.SENSOR_DELAY_FASTEST);
super.onResume();
}
@Override
protected void onPause() {
mSensorManager.unregisterListener(this);
super.onPause();
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
if (sensor.getType() == Sensor.TYPE_LIGHT) {
// TODO
}
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_LIGHT) {
// TODO
}
}
}
答案 0 :(得分:12)
尝试以下代码: -
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.app.Activity;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView textLIGHT_available, textLIGHT_reading;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textLIGHT_available
= (TextView)findViewById(R.id.LIGHT_available);
textLIGHT_reading
= (TextView)findViewById(R.id.LIGHT_reading);
SensorManager mySensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
Sensor lightSensor = mySensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
if(lightSensor != null){
textLIGHT_available.setText("Sensor.TYPE_LIGHT Available");
mySensorManager.registerListener(
lightSensorListener,
lightSensor,
SensorManager.SENSOR_DELAY_NORMAL);
} else {
textLIGHT_available.setText("Sensor.TYPE_LIGHT NOT Available");
}
}
private final SensorEventListener lightSensorListener
= new SensorEventListener(){
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent event) {
if(event.sensor.getType() == Sensor.TYPE_LIGHT){
textLIGHT_reading.setText("LIGHT: " + event.values[0]);
}
}
};
}
答案 1 :(得分:0)
如果只有一个轻微的变化你可以检查一下光传感器值是否为0.如果你因某个特定原因检测到一些奇怪的变化,比如27到20,那么我想你可能需要使用机器学习。