else{ //this is part of some onclick listener of a button in the program
slider.close();
mapView.setClickable(false);
Toast.makeText(getBaseContext(), "GPS cannot retrieve your location. GPS needs clear sky or service is off. Please turn on GPS service.", Toast.LENGTH_LONG).show();
final Button bt = (Button)findViewById(R.id.turnGPS);
bt.setVisibility(View.VISIBLE);
bt.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
Intent activateGps = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
//Map.this.startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
Map.this.startActivityForResult(activateGps, RESULT_OK);
//bt.setVisibility(View.INVISIBLE);
return false;
}
});
}
}
我想开始新的意图,所以用户可以启用GPS(如果GPS之前未激活)。我使用了startActivityForResult方法,该方法可以响应Activity是否成功。当成功时,它必须在用户界面上做一些改变....我试过并启用了GPS,但UI上仍然没有改变(例如:按钮不隐藏)。我做错了什么?onActivityResult的意图
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(requestCode==RESULT_OK)
{
if(resultCode == RESULT_OK && locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
{
Button bt = (Button)findViewById(R.id.turnGPS);
bt.setVisibility(View.INVISIBLE);
this.finish();
}
else if(resultCode == RESULT_CANCELED)
{
Toast.makeText(getBaseContext(), "No GPS device or service enabled", Toast.LENGTH_LONG+Toast.LENGTH_LONG).show();
}
}
super.onActivityResult(requestCode, resultCode, data);
}
这是我的onActivityResult方法。是否this.finish();当它启用时完成当前活动,因此它启动OnResume()?
请考虑为答案添加解释。 – Onik 2014-05-19 14:40:52