Android sensor explorer (fragments)

exploring-sensors-1.java

public class SensorsActivity extends Activity implements SensorEventListener, OnItemSelectedListener 
{ 
   ...
}

exploring-sensors-2.java

...
   // Sensors manager 
   private SensorManager sm = null; 
   // Some UI elements 
   private Spinner spin = null; 
   private TextView name = null; 
   private TextView vendor = null; 
   private TextView type = null; 
   private GridView results = null; 
   // List of discovered sensors 
   private List<Sensor> sensorsList; 
   private int selected = -1;
...

exploring-sensors-3.java

public void onCreate(Bundle savedInstanceState) 
{ 
   super.onCreate(savedInstanceState); 
   setContentView(R.layout.activity_sensors); 
   // get sensors manager 
   sm = (SensorManager) getSystemService(SENSOR_SERVICE); 
   // get UI elements handlers 
   spin = (Spinner) findViewById(R.id.sensorsList); 
   name = (TextView) findViewById(R.id.nameValue); 
   type = (TextView) findViewById(R.id.typeValue); 
   vendor = (TextView) findViewById(R.id.vendorValue); 
   results = (GridView) findViewById(R.id.sensorValues); 
   // set spinner listener 
   spin.setOnItemSelectedListener(this); 
   // Fills the spinner 
   sensorsList = sm.getSensorList(Sensor.TYPE_ALL); 
   ArrayList<String> als = new ArrayList<String>(); 
   for(Sensor s : sensorsList) 
   { 
       	als.add(s.getType() + " : " + s.getName()); 
   } 
   ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, als); 
   spin.setAdapter(adapter); 
} 

exploring-sensors-4.java

public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) 
{ 
   // Unregister current 
   sm.unregisterListener(this); 
   // Register selected one 
   Sensor sensor = sensorsList.get(pos); 
   selected = pos; 
   sm.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL); 
   // write sensors details 
   name.setText(sensor.getName()); 
   vendor.setText(sensor.getVendor()); 
   type.setText(String.valueOf(sensor.getType()));		 
}

exploring-sensors-5.java

protected void onStop() 
{ 
   sm.unregisterListener(this); 
   super.onStop(); 
} 
...
protected void onPause() 
{ 
   super.onPause(); 
   sm.unregisterListener(this); 
} 

exploring-sensors-6.java

public void onSensorChanged(SensorEvent event) 
{ 
   String []vals = new String[event.values.length]; 
   for(int j=0;j<vals.length;j++) 
   { 
      vals[j] = j + " : " + event.values[j]; 
   } 
   // Writes sensor data to grid view 
   ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, vals); 
   results.setAdapter(adapter); 
} 

exploring-sensors.xml

<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:layout_margin="1dp" 
    android:gravity="top" > 

    <Spinner 
        android:id="@+id/sensorsList" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" /> 

    <TextView 
        android:id="@+id/nameLabel" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_alignParentLeft="true" 
        android:layout_below="@+id/sensorsList" 
        android:text="@string/name" /> 

    <TextView 
        android:id="@+id/vendorLabel" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_alignParentLeft="true" 
        android:layout_below="@+id/nameLabel" 
        android:text="@string/vendor" /> 

    <TextView 
        android:id="@+id/typeLabel" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_alignParentLeft="true" 
        android:layout_below="@+id/vendorLabel" 
        android:text="@string/type" /> 

    <TextView 
        android:id="@+id/nameValue" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_above="@+id/vendorLabel" 
        android:layout_alignParentRight="true"        
        android:text="------" /> 
    
        <TextView 
        android:id="@+id/typeValue" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_alignParentRight="true" 
        android:layout_below="@+id/vendorLabel" 
        android:text="------" /> 

    <TextView 
        android:id="@+id/vendorValue" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_above="@+id/typeValue" 
        android:layout_alignParentRight="true" 
        android:text="------" /> 

    <GridView 
        android:id="@+id/sensorValues" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:layout_alignParentLeft="true" 
        android:layout_below="@+id/typeLabel" 
        android:layout_marginTop="27dp" 
        android:numColumns="1" > 
    </GridView> 

</RelativeLayout>