我在我的应用程序中使用Location Manager进行GPS跟踪。应用程序在Android 2.2,2.3.3模拟器和设备中使用时返回apt位置。但是，奇怪的是我在模拟器4.0.2 中测试了应用程序。它会在 logcat 中将强制关闭错误返回为05-28 15:13:46.584: E/AndroidRuntime(4458): at com.package.TestRun.registerLocationListeners(TestRun.java:191)。我已经实现了如下代码：
LocationManager lm;
LocationManager lmNet;
private void registerLocationListeners() {
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (myGPSLocationListener == null || mynetworkprovider == null)
{
createLocationListeners();
}
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER ,0,0,mynetworkprovider);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER ,60000,0,myGPSLocationListener);
}
private void createLocationListeners() {
mynetworkprovider = new LocationListener() {
public void onLocationChanged(Location argLocation) {
if (argLocation != null) {
gps[0] = argLocation.getLatitude();
gps[1] = argLocation.getLongitude();
//Toast.makeText( getApplicationContext(),"Network provider Lat =" + gps[0] + " Lon = " + gps[1] , Toast.LENGTH_SHORT).show();
}
//Toast.makeText( getApplicationContext(),"On Location change" , Toast.LENGTH_SHORT).show();
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
// Toast.makeText( getApplicationContext(),"Disable" , Toast.LENGTH_SHORT).show();
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
// Toast.makeText( getApplicationContext(),"enabled" , Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider,
int status, Bundle extras) {
// TODO Auto-generated method stub
//Toast.makeText( getApplicationContext(),"Status change" , Toast.LENGTH_SHORT).show();
}
};
myGPSLocationListener = new LocationListener() {
public void onLocationChanged(Location argLocation) {
if (argLocation != null) {
gps[0] = argLocation.getLatitude();
gps[1] = argLocation.getLongitude();
//Toast.makeText( getApplicationContext(),"GPS Lat =" + gps[0] + " Lon = " + gps[1] , Toast.LENGTH_SHORT).show();
}
//Toast.makeText( getApplicationContext(),"On Location change" , Toast.LENGTH_SHORT).show();
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
//Toast.makeText( getApplicationContext(),"Disable" , Toast.LENGTH_SHORT).show();
//launchGPS();
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
//Toast.makeText( getApplicationContext(),"enabled" , Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider,
int status, Bundle extras) {
// TODO Auto-generated method stub
//Toast.makeText( getApplicationContext(),"Status change" , Toast.LENGTH_SHORT).show();
}
};
}
更新：这是我的logcat：
05-28 15:42:46.375: E/AndroidRuntime(5585): FATAL EXCEPTION: main
05-28 15:42:46.375: E/AndroidRuntime(5585): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.package/com.package.TestRun}: java.lang.IllegalArgumentException: provider=network
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.ActivityThread.access$600(ActivityThread.java:122)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.os.Handler.dispatchMessage(Handler.java:99)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.os.Looper.loop(Looper.java:137)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.ActivityThread.main(ActivityThread.java:4340)
05-28 15:42:46.375: E/AndroidRuntime(5585): at java.lang.reflect.Method.invokeNative(Native Method)
05-28 15:42:46.375: E/AndroidRuntime(5585): at java.lang.reflect.Method.invoke(Method.java:511)
05-28 15:42:46.375: E/AndroidRuntime(5585): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-28 15:42:46.375: E/AndroidRuntime(5585): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-28 15:42:46.375: E/AndroidRuntime(5585): at dalvik.system.NativeStart.main(Native Method)
05-28 15:42:46.375: E/AndroidRuntime(5585): Caused by: java.lang.IllegalArgumentException: provider=network
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.os.Parcel.readException(Parcel.java:1331)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.os.Parcel.readException(Parcel.java:1281)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.location.ILocationManager$Stub$Proxy.requestLocationUpdates(ILocationManager.java:646)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.location.LocationManager._requestLocationUpdates(LocationManager.java:582)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.location.LocationManager.requestLocationUpdates(LocationManager.java:446)
05-28 15:42:46.375: E/AndroidRuntime(5585): at com.package.TestRun.registerLocationListeners(TestRun.java:191)
05-28 15:42:46.375: E/AndroidRuntime(5585): at com.package.TestRun.onCreate(TestRun.java:135)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.Activity.performCreate(Activity.java:4465)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
05-28 15:42:46.375: E/AndroidRuntime(5585): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
Location Manager API中的Android 4.0是否有任何更新？如果有人遇到同样的问题，请分享观点/解决方案链接。
答案 0 :(得分：2)
这是一个问题。看看this。
它说：
不要使用直接provider字符串，因为不能保证它在运行时存在。
仅使用您从providers获得的LocationManager，如下所示：
LocationManager locationManager = (LocationManager)context.getSystemService( Context.LOCATION_SERVICE );
Criteria criteria = new Criteria();
criteria.setAccuracy( Criteria.ACCURACY_COARSE );
String provider = locationManager.getBestProvider( criteria, true );
if ( provider == null ) {
Log.e( TAG, "No location provider found!" );
return;
}
lastLocation = locationManager.getLastKnownLocation(provider);
或
locationmanager中的另一个有用方法是LocationManager.getAllProviders()
/**
* Returns a list of the names of all known location providers. All
* providers are returned, including ones that are not permitted to be
* accessed by the calling activity or are currently disabled.
*
* @return list of Strings containing names of the providers
*/