我读过不同的帖子,因为阻止了用户界面,所以当显示AlertDialog时,无法等待用户采取操作.
但是,像Facebook这样的应用程序显示Gps目前被禁用.要启用gps吗？提醒对话框,等待用户按是/否.
我认为可以使用2种不同的活动,第一种只包含gps警报对话框,但这似乎并不正确,并且绝对不会像Facebook这样做.
任何人都可以告诉我如何实现这一点？
这是我的代码：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
InitializeComponents();
EnableGPSIfPossible();
ListAsync lAsync = new ListAsync(this);
lAsync .execute();
}
private void EnableGPSIfPossible()
{
final LocationManager manager = (LocationManager) getSystemService( Context.LOCATION_SERVICE );
if ( !manager.isProviderEnabled( LocationManager.GPS_PROVIDER ) ) {
buildAlertMessageNoGps();
}
}
private void buildAlertMessageNoGps() {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Yout GPS seems to be disabled,do you want to enable it?")
.setCancelable(false)
.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
public void onClick(@SuppressWarnings("unused") final DialogInterface dialog,@SuppressWarnings("unused") final int id) {
startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
})
.setNegativeButton("No",new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog,@SuppressWarnings("unused") final int id) {
dialog.cancel();
}
});
final AlertDialog alert = builder.create();
alert.show();
}
所以,在我的代码中,AsynTask是imediately启动的,而不用等待用户激活gps. (这是一个正常的行为)
谢谢！
解决方法
你可以做的是这样的：
GPSManager.java：
public class GPSManager {
private Activity activity;
private LocationManager mlocManager;
private LocationListener gpsListener;
public GPSManager(Activity activity) {
this.activity = activity;
}
public void start() {
mlocManager = (LocationManager) activity
.getSystemService(Context.LOCATION_SERVICE);
if (mlocManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
setUp();
findLoc();
} else {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
activity);
alertDialogBuilder
.setMessage("GPS is disabled in your device. Enable it?")
.setCancelable(false)
.setPositiveButton("Enable GPS",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
activity.startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("Cancel",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
}
public void setUp() {
gpsListener = new GPSListener(activity,mlocManager);
}
public void findLoc() {
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1,gpsListener);
if (mlocManager.getLastKnownLocation(LocationManager.GPS_PROVIDER) == null)
Toast.makeText(activity,"LAST Location null",Toast.LENGTH_SHORT)
.show();
else {
gpsListener.onLocationChanged(mlocManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER));
}
}
}
GPSListener.java：
public class GPSListener implements LocationListener {
private Activity activity;
private LocationManager lm;
private int numberOfUpdates;
public static final int MAX_NUMBER_OF_UPDATES = 10;
public GPSListener(Activity activity,LocationManager lm) {
this.activity = activity;
this.lm = lm;
}
@Override
public void onLocationChanged(Location loc) {
if (numberOfUpdates < MAX_NUMBER_OF_UPDATES) {
numberOfUpdates++;
Log.w("LAT",String.valueOf(loc.getLatitude()));
Log.w("LONG",String.valueOf(loc.getLongitude()));
Log.w("ACCURACY",String.valueOf(loc.getAccuracy() + " m"));
Log.w("PROVIDER",String.valueOf(loc.getProvider()));
Log.w("SPEED",String.valueOf(loc.getSpeed() + " m/s"));
Log.w("ALTITUDE",String.valueOf(loc.getAltitude()));
Log.w("BEARING",String.valueOf(loc.getBearing() + " degrees east of true north"));
String message;
if (loc != null) {
message = "Current location is: Latitude = "
+ loc.getLatitude() + ",Longitude = "
+ loc.getLongitude();
// lm.removeUpdates(this);
} else
message = "Location null";
Toast.makeText(activity,message,Toast.LENGTH_SHORT).show();
} else {
lm.removeUpdates(this);
}
}
@Override
public void onProviderDisabled(String provider) {
Toast.makeText(activity,"Gps Disabled",Toast.LENGTH_SHORT).show();
}
@Override
public void onProviderEnabled(String provider) {
Toast.makeText(activity,"Gps Enabled",Toast.LENGTH_SHORT).show();
}
@Override
public void onStatusChanged(String provider,int status,Bundle extras) {
}
}
然后从你的活动：
GPSManager gps = new GPSManager(
yourActivity.this);
gps.start();
