利用Android的传感器改变背景颜色

来源：互联网发布：体质辨识软件app 编辑：程序博客网时间：2024/05/20 04:30

最近许多程序都使用了android机硬件的传感器(Sensor)，其中传感器又分为好几种，比如方向，加速计，温度，磁场等，但是不同机型并不保证包括所有类型的传感器。不过大部分机子都包括加速计，下面写一个简单的demo来演示利用加速计改变应用背景颜色。

1.Activity:

public class MainActivity extends Activity implements SensorEventListener {private SensorManager sensorManager;private long lastUpdate;private View view;private static final int[] colors = { Color.RED, Color.BLACK, Color.BLUE,Color.CYAN, Color.YELLOW, Color.GRAY, Color.GREEN };private Random r = new Random();@Overrideprotected void onCreate(Bundle savedInstanceState) {requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);view = findViewById(R.id.parent);sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);lastUpdate = System.currentTimeMillis();}@Overridepublic void onSensorChanged(SensorEvent event) {if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {getAccelerometer(event);}}private void getAccelerometer(SensorEvent event) {float[] values = event.values;// x轴,y轴,z轴加速度float x = values[0];float y = values[1];float z = values[2];float accelationSquareRoot = (x * x + y * y + z * z)/ (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH);long actualTime = System.currentTimeMillis();if (accelationSquareRoot >= 2) {if (actualTime - lastUpdate < 500) {return;}lastUpdate = actualTime;Toast.makeText(this, "设备甩了一下", Toast.LENGTH_SHORT).show();view.setBackgroundColor(colors[r.nextInt(colors.length)]);}}@Overridepublic void onAccuracyChanged(Sensor sensor, int accuracy) {}@Overrideprotected void onResume() {super.onResume();// 注册监听器sensorManager.registerListener(this,sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_NORMAL);}@Overrideprotected void onPause() {super.onPause();// 注销监听器sensorManager.unregisterListener(this);}}

2. layout文件:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/parent"    android:layout_width="fill_parent"    android:layout_height="fill_parent" ></LinearLayout>

3. 使用传感器不需要在清单文件中添加权限。

4.甩几下手机：

... Hope it helps you.