android-lifecycle

Here is how my app is laid out: onResume() user is prompted to login If user logs in, he can continue using the app 3. If the user logs out at any time, I want to prompt login again How can I achieve this? Here is my MainActivity: @Override protected void onResume(){ super.onResume(); isLoggedIn = prefs.getBoolean("isLoggedIn", false); if(!isLoggedIn){ showLoginActivity(); } } Here is my LoginActivity: @Override protected void onPostExecute(JSONObject json) { String authorized = "200"; String unauthorized = "401"; String notfound = "404"; String status = new String(); try { // Get the messages

I have a DialogFragment which creates a DatePickerDialog. I'm using a static method called newInstance to set the initial values in order to use the default empty constructor. However, how am I supposed to set the listener? After the screen rotation, when clicking in the "Done" button, the listener doesn't do anything since it does not exist. public class DatePickerFragment extends DialogFragment { public static final String ARG_YEAR = "year"; public static final String ARG_MONTH = "month"; public static final String ARG_DAY = "day"; private OnDateSetListener listener_; public static

I have the following code : MainActivity.java package com.erc.library; import java.io.BufferedInputStream; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import android.app.ActionBar; import android.app.ActionBar.Tab; import android.app.FragmentTransaction; import android.content.SharedPreferences; import android.content.res.Resources; import android.graphics.Color; import android.os.Bundle; import android.os.Environment; import android.os.StrictMode; import android.support.v4.app.FragmentActivity; import

I have a regular button that I want to display a timer on. So imagine the text of the button changes every second as a countdown timer. However, I need this timer to only start when the button is fully rendered and ready to go on the screen. Right now I'm starting the timer (which is an AsyncTask ) in the onCreateView() of a fragment. This isn't that accurate, because I do some other loading stuff that I have to have. I could potentially move the timer start at the bottom of onCreateView() but even that isn't very accurate either. I saw that there's a OnGlobalLayoutListener tree observer. But

I have been going gaga to figure this out. Although I have read a lot that on Orientation Change, Android kills an activity and starts it as a fresh one, and the only way to handle this is to save all the stuff inside onSaveInstanceState() and try to restore it inside onCreate() . But my activity does a lot and different kind of network activities at different times and if the orientation is changed when the network activity is being performed, I'll have to handle a lot of different and complex scenarios. Is there any simple way to just point Android that this activity doesn't need to be

I want to apply an activities transition like the one that HTC phones have: When you start a new Activity there is a slide right-to-left, but when you press the back button to return to the previous Activity, there is a slide left-to-right animation. I have used overridePendingTransition in the onResume of my Activities to simulate the slide right to left animation, but when I press the back button, the same animation is executed which is wrong (from a result perspective). Thus I would like to ask how to manage having different animations for an Activity, one for when it is created, and one