Android之使用传感器获取相应数据

package com.magnetic;

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.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
    private TextView magneticView;    
    private TextView orientationView;    
    private TextView totalMageticView;
    private SensorManager sensorManager;    
    private MySensorEventListener sensorEventListener;  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        sensorEventListener = new MySensorEventListener();    
        magneticView = (TextView) this.findViewById(R.id.magneticView);    
        orientationView = (TextView) this.findViewById(R.id.orientationView);  
        totalMageticView=(TextView) this.findViewById(R.id.totalMageticView);
        //获取感应器管理器    
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);   
    }
    @Override    
    protected void onResume()     
    {    
        //获取方向传感器    
        @SuppressWarnings("deprecation")
        Sensor orientationSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);    
        sensorManager.registerListener(sensorEventListener, orientationSensor, SensorManager.SENSOR_DELAY_NORMAL);    
            
        //获取加速度传感器    
        Sensor accelerometerSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);    
        sensorManager.registerListener(sensorEventListener, accelerometerSensor, SensorManager.SENSOR_DELAY_NORMAL);    
        super.onResume();    
    } 

    @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;
    }
    
    private final class MySensorEventListener implements SensorEventListener    
    {    
        //可以得到传感器实时测量出来的变化值    
        @Override    
        public void onSensorChanged(SensorEvent event)     
        {       
            //得到方向的值    
            if(event.sensor.getType()==Sensor.TYPE_ORIENTATION)    
            {    
                float x = event.values[SensorManager.DATA_X];          
                float y = event.values[SensorManager.DATA_Y];          
                float z = event.values[SensorManager.DATA_Z];      
                orientationView.setText("方向: " + x + ", " + y + ", " + z);     
            }    
            //得到加速度的值    
            else if(event.sensor.getType()==Sensor.TYPE_MAGNETIC_FIELD)    
            {    
                float x = event.values[SensorManager.DATA_X];          
                float y = event.values[SensorManager.DATA_Y];          
                float z = event.values[SensorManager.DATA_Z];     
                magneticView.setText("合磁场强度X、Y、Z分量: " + x + ", " + y + ", " + z);   
                //计算和磁场强度
                float total=(float)(Math.sqrt(Math.pow(x,2)+Math.pow(y,2)+Math.pow(z, 2)));
                totalMageticView.setText("合磁场强度: " + total); 
            }  
        }    
        //重写变化    
        @Override    
        public void onAccuracyChanged(Sensor sensor, int accuracy)     
        {    
        }    
    }   
    
    //暂停传感器的捕获    
    @Override    
    protected void onPause()     
    {    
        sensorManager.unregisterListener(sensorEventListener);    
        super.onPause();    
    }        
    
}

<?xml version="1.0" encoding="utf-8"?>
<TableLayout    
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    
    <TableRow>
    <TextView 
        android:id="@+id/orientationView"
        android:text="方向传感器："
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
    />    
    </TableRow>    
    <TableRow>
    <TextView 
        android:id="@+id/magneticView"
        android:text="磁传感器:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"        
    />    
    </TableRow>
    <TableRow>
    <TextView 
        android:id="@+id/totalMageticView"
        android:text="合磁强度:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"        
    />    
    </TableRow>
</TableLayout>