动作传感器的组成及使用方法

 1 //动作传感器：加速度传感器，重力传感器：
 2 public class MainActivity extends Activity implements SensorEventListener {
 3     private TextView tvAcceleromter;
 4     private SensorManager sManager;
 5     private float[] gravity = new float[3];
 6 
 7     @Override
 8     protected void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.fragment_main);
11         tvAcceleromter = (TextView) findViewById(R.id.tv);
12         sManager = (SensorManager) getSystemService(SENSOR_SERVICE);
13 
14     }
15 
16     // 传感器数据变化
17     @Override
18     public void onSensorChanged(SensorEvent event) {
19         // TODO Auto-generated method stub
20         switch (event.sensor.getType()) {
21         // 加速度 9.81m/s^2
22         case Sensor.TYPE_ACCELEROMETER:
23             final float alpha = (float) 0.8;// 系数
24             gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
25             gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
26             gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];
27             // String accelerometer = "加速度：" + "X轴：" + event.values[0] + "Y轴:"
28             // + event.values[1] + "Z轴:" + (event.values[2] - 9.81);
29             // 去掉杂音
30             String accelerometer = "加速度：" + "X轴："
31                     + (event.values[0] - gravity[0]) + "Y轴:"
32                     + (event.values[1] - gravity[1]) + "Z轴:"
33                     + (event.values[2] - gravity[2]);
34             Log.i("--->>", String.valueOf(event.values[2] - gravity[2]));
35 
36             // event.values[0]; X轴
37             // event.values[1]; Y轴
38             // event.values[2]; Z轴
39 
40             tvAcceleromter.setText(accelerometer);
41             break;
42         // 重力
43         case Sensor.TYPE_GRAVITY:
44             gravity[0] = event.values[0];
45             gravity[1] = event.values[1];
46             gravity[2] = event.values[2];
47             break;
48 
49         default:
50             break;
51         }
52     }
53 
54     // 传感器精度变化
55     @Override
56     public void onAccuracyChanged(Sensor sensor, int accuracy) {
57         // TODO Auto-generated method stub
58 
59     }
60 
61     @Override
62     protected void onResume() {
63         // TODO Auto-generated method stub
64         super.onResume();
65         // 注册传感器
66         // 加速度
67         sManager.registerListener(this,
68                 sManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
69                 SensorManager.SENSOR_DELAY_NORMAL);
70         // 重力
71         sManager.registerListener(this,
72                 sManager.getDefaultSensor(Sensor.TYPE_GRAVITY),
73                 SensorManager.SENSOR_DELAY_FASTEST);
74 
75     }
76 
77     @Override
78     protected void onPause() {
79         // TODO Auto-generated method stub
80         super.onPause();
81         // 不在截获传感器数据
82         sManager.unregisterListener(this);
83 
84     }
85 
86 }