我检查活动何时启动位置服务是否打开,如果没有打开启动“启用位置活动”意图的对话框。一旦我从它返回,我正在检查该位置是否真的被启用,如果是的话,我正在关闭警报对话框。无法在onResume()后关闭AlertDialog()
理论上这应该可行,但是当我的活动恢复时,并且打电话给dialog.dismiss()
绝对没有任何反应。
我的代码如下 - :
public class LocationUtils {
private static AlertDialog dialog_ = null;
public static void checkAndEnableLocationServices(final Activity context) {
LocationManager lm = (LocationManager) context.getSystemService(context.LOCATION_SERVICE);
boolean gps_enabled = false;
boolean network_enabled = false;
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
} catch (Exception ex) {
ex.printStackTrace();
}
try {
network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
} catch (Exception ex) {
ex.printStackTrace();
}
System.out.println("gps_enabled = " + gps_enabled);
System.out.println("network_enabled = " + network_enabled);
if (!gps_enabled && !network_enabled) {
// notify user
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage("Location services are disabled");
builder.setPositiveButton("Enable Location Services", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
// TODO Auto-generated method stub
Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
context.startActivity(myIntent);
//get gps
}
});
builder.setNegativeButton("Exit", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface paramDialogInterface, int paramInt) {
context.finish();
}
});
//For future reference.
AlertDialog dialog = builder.create();
dialog_ = dialog;
dialog.show();
} else {
if(dialog_!=null) {
dialog_.dismiss();
}
}
}
}
在我的主要活动我有一个回调的onResume,做以下各项:
@Override
protected void onResume() {
super.onResume();
System.out.println("Activity resume()");
LocationUtils.checkAndEnableLocationServices(this);
}
我缺少什么?为什么这是对话框不关闭?该代码不会引发任何错误。这是我的一个WTF时刻。
没有工作。已经试过了 –