public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    // Get the texts fields of the layout and setup to invisible 
    mSensorsTot   = (TextView) findViewById(R.id.sensoritot); 
    mSensorAvailables  = (TextView) findViewById(R.id.sensoridisponibili); 
 
    // Get the SensorManager  
    mSensorManager= (SensorManager) getSystemService(SENSOR_SERVICE); 
 
    // List of Sensors Available 
    List<Sensor> msensorList = mSensorManager.getSensorList(Sensor.TYPE_ALL ); 
 
    // Print how may Sensors are there 
    mSensorsTot.setText(msensorList.size()+" "+this.getString(R.string.sensors)+"!"); 
 
    // Print each Sensor available using sSensList as the String to be printed 
    String sSensList = new String(""); 
    Sensor tmp; 
    int x,i; 
    for (i=0;i<msensorList.size();i++){ 
     tmp = msensorList.get(i); 
     sSensList = " "+sSensList+tmp.getName(); // Add the sensor name to the string of sensors available 
    } 
    // if there are sensors available show the list 
    if (i>0){ 
     sSensList = getString(R.string.sensors)+":"+sSensList; 
     mSensorAvailables.setText(sSensList); 
    } 
} 

 这里呢要注意使用Sensor.TYPE_ALL 而不是使用废棋的SensorManager.SENSOR_ALL他对部分机器不使用

把我好郁闷

int count =  mListAdapter.getGroupCount(); 
for (int i = 0; i <count ; i++) 
  mListView.collapseGroup(i); 

 

 

 import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;

/**
 * This Activty shows how to save an image (Bitmap) to the filesystem, with FileOutputStream object
 * @author FaYnaSoft Labs
 *
 */
public class Main extends Activity {
 private Bitmap bitmap;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);

        FileOutputStream fos = null;
        try {
            fos = openFileOutput("image", Context.MODE_PRIVATE);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
        } catch (FileNotFoundException e) {
        } finally {
            if (fos != null) {
                try {
                    fos.flush();
                    fos.close();
                } catch (IOException e) {
                }
            }
        }
    }
}