Android传感器之磁场传感器

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package com.example.magnetic_field_sensor; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.view.Menu; import android.widget.TextView; import android.widget.Toast; /** * 磁场传感器 * * @author pengxiaolong * */ public class MainActivity extends Activity {                  SensorManager sensorManager;//管理器对象                  Sensor magneticSensor;//传感器对象                  TextView tv_X;                  TextView tv_Y;                  TextView tv_Z;                  TextView tv_info;                         @Override         protected void onCreate(Bundle savedInstanceState) {                 super.onCreate(savedInstanceState);                 setContentView(R.layout.main);                 View_init();                 projectinit();         }         @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;         }                         /**          * 对象的初始化          */         private void projectinit(){                                 sensorManager=(SensorManager) getSystemService(SENSOR_SERVICE);                 magneticSensor=sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);                 if(magneticSensor==null){                         Toast.makeText(this, "您的设备不支持该功能！", 0).show();                 }else{                 String str="\n名字："+magneticSensor.getName()+"\n电池："+magneticSensor.getPower()+"\n类型："+magneticSensor.getType()+"\nVendor:"+magneticSensor.getVendor()+"\n版本："+magneticSensor.getVersion()+"\n幅度："+magneticSensor.getMaximumRange();                             tv_info.setText(str);                 }                                 /**                  * 注册监听器                  */                 sensorManager.registerListener(sensoreventlistener, magneticSensor, SensorManager.SENSOR_DELAY_NORMAL);         }                 /**          * 小组件的初始化          */         private void View_init(){                                 tv_info=(TextView) this.findViewById(R.id.info);                 tv_X=(TextView) this.findViewById(R.id.tvX);                 tv_Y=(TextView) this.findViewById(R.id.tvY);                 tv_Z=(TextView) this.findViewById(R.id.tvZ);                                         }                     @Override         protected void onDestroy() {                 // TODO Auto-generated method stub                 super.onDestroy();                 /**                  * 解除注册                  */                 sensorManager.unregisterListener(sensoreventlistener);         }         private Handler handler=new Handler(){                 @Override                 public void handleMessage(Message msg) {                         // TODO Auto-generated method stub                                                 switch(msg.what){                                                 case CHANGE:                                                                 float[] valuse=(float[]) msg.obj;                                 tv_X.setText("X轴方向的磁场为："+Float.toString(valuse[0]));                                 tv_Y.setText("Y轴方向的磁场为："+Float.toString(valuse[1]));                                 tv_Z.setText("Z轴方向的磁场为："+Float.toString(valuse[2]));                                 break;                         }                         super.handleMessage(msg);                 }                                                         };         /**          * 传感器的监听          */         private SensorEventListener sensoreventlistener=new SensorEventListener() {                                 @Override                 public void onSensorChanged(SensorEvent event) {                         // TODO Auto-generated method stub                                                 float[] valuse=event.values;                         Message message=new Message();                         message.obj=valuse;                         message.what=CHANGE;                         handler.sendMessage(message);                                 }                                 @Override                 public void onAccuracyChanged(Sensor sensor, int accuracy) {                         // TODO Auto-generated method stub                                                                 }         };                 private static final byte CHANGE=0x1; }