1. 保存在sdcard 首先不要忘记权限

 //First create a new URL object  
URL url = new URL("/logos/holiday09_2.gif") 
 
//Next create a file, the example below will save to the SDCARD using JPEG format 
File file = new File("/sdcard/example.jpg"); 
 
//Next create a Bitmap object and download the image to bitmap 
Bitmap bitmap = BitmapFactory.decodeStream(url.openStream()); 
 
//Finally compress the bitmap, saving to the file previously created 
bitmap.compress(CompressFormat.JPEG, 100, new FileOutputStream(file)); 

2.使用Collection(HashMap,List etc.)  你必须使用java.lang.ref.SoftReference specifically 如果你的图片很大

HashMap<String,SoftReference<Bitmap>> imageCache = 
        new HashMap<String,SoftReference<Bitmap>>(); 

1.

final Intent intent = new Intent(context, YourService.class); 
final PendingIntent pending = PendingIntent.getService(context, 0, intent, 0); 
final AlarmManager alarm = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); 
alarm.cancel(pending); 
long interval = 30000;//milliseconds 
alarm.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(),interval, pending); 

2.

 .setDropDownHeight(int height)

package gps.test; 
 
import android.app.Activity; 
import android.content.Context; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.widget.Toast; 
 
public class GPS extends Activity { 
private LocationManager lm; 
private LocationListener locationListener; 
 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
 
    // ---use the LocationManager class to obtain GPS locations--- 
    lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
 
    locationListener = new MyLocationListener(); 
 
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 100, 1, 
            locationListener); 
} 
 
private class MyLocationListener implements LocationListener { 
    @Override 
    public void onLocationChanged(Location loc) { 
        if (loc != null) { 
            Toast.makeText( 
                    getBaseContext(), 
                    "Location changed : Lat: " + loc.getLatitude() 
                            + " Lng: " + loc.getLongitude(), 
                    Toast.LENGTH_SHORT).show(); 
        } 
    } 
 
    @Override 
    public void onProviderDisabled(String provider) { 
        // TODO Auto-generated method stub 
    } 
 
    @Override 
    public void onProviderEnabled(String provider) { 
        // TODO Auto-generated method stub 
    } 
 
    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
        // TODO Auto-generated method stub 
    } 
} 
} 
你一定记得要移动一下啊，不过最好还是设置一下参数 该成1秒1000 另一个为0也可以