调用anroid的光线传感器使用。
实现效果图：
MainActivity.Java
package hk.ust.cse.comp107x.ligthsensor; import android.content.Context; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.TextView; public class MainActivity extends AppCompatActivity implements SensorEventListener{ private SensorManager mSensorManager; private Sensor mPressure; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get an instance of the sensor service, and use that to get an instance of // a particular sensor. mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); mPressure = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); } @Override public final void onAccuracyChanged(Sensor sensor, int accuracy) { // Do something here if sensor accuracy changes. } @Override public final void onSensorChanged(SensorEvent event) { float light = event.values[0]; TextView v = (TextView)findViewById(R.id.textView); v.setText(Float.toString(light)); // Do something with this sensor data. } @Override protected void onResume() { // Register a listener for the sensor. super.onResume(); mSensorManager.registerListener(this, mPressure, SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onPause() { // Be sure to unregister the sensor when the activity pauses. super.onPause(); mSensorManager.unregisterListener(this); } }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="hk.ust.cse.comp107x.ligthsensor.MainActivity"> <TextView android:id="@+id/textView" android:textSize="50dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="177dp" /> </RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="hk.ust.cse.comp107x.ligthsensor"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
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