There is only one difference between `commit()` and `commitAllowingStateLoss()`: the latter doesn&#39;t throw an exception if state loss occurs. Other than that, they have identical behavior.

See my [**blog post**](http://www.androiddesignpatterns.com/2013/08/fragment-transaction-commit-state-loss.html) about this topic for more information.

 **commit():** 

Schedules a commit of this transaction. The commit does not happen immediately; it will be scheduled as work on the main thread to be done the next time that thread is ready.
 
**commitAllowingStateLoss():** 

A transaction can only be committed with this method prior to its containing activity saving its state. If the commit is attempted after that point, an exception will be thrown. This is because the state after the commit can be lost if the activity needs to be restored from its state. See commitAllowingStateLoss() for situations where it may be okay to lose the commit.


If you do commit() after onSaveInstance(), you will get below exception:

    java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
        at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1341)
        at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1352)
        at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
        at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)



OpenSSL provides a popular (but insecure – see below!) command line interface for AES encryption:

    openssl aes-256-cbc -salt -in filename -out filename.enc

Python has support for AES in the shape of the PyCrypto package, but it only provides the tools. How to use Python/PyCrypto to decrypt files that have been encrypted using OpenSSL?

Notice
------
This question used to also concern encryption in Python using the same scheme. I have since removed that part to discourage anyone from using it. Do NOT encrypt any more data in this way, because it is NOT secure by today&#39;s standards. You should ONLY use decryption, for no other reasons than BACKWARD COMPATIBILITY, i.e. when you have no other choice. Want to encrypt? Use NaCl/libsodium if you possibly can.



How to decrypt OpenSSL AES-encrypted files in Python?

How can I call a normal (not static) class function by its name?

The below gives an error saying param 1 needs to be a valid callback. I don&#39;t want the function to be static, I want it to be a normal function, and all the examples I&#39;ve seen so far had them static.


    class Player
    {
        public function SayHi() { print(&quot;Hi&quot;); }
    }

    $player = new Player();

    call_user_func($Player, &#39;SayHi&#39;);




php call class function by string name

I was using the commit method in my project that built it with fragments. 

Anyway, sometimes I was getting `IllegalStateException: Can not perform this action after onSaveInstanceState` error and I couldn&#39;t find any good solution about it but just this method `commitAllowingStateLoss()`. I changed commit function to `commitAllowingStateLoss()` but didn&#39;t use it long time to test so may this function help me? And the main question, what is the difference between `commit()` and `commitAllowingStateLoss()`?

What is the difference between commit() and commitAllowingStateLoss() in Fragments

<p>I was using the commit method in my project that built it with fragments.</p>
<p>Anyway, sometimes I was getting <code>IllegalStateException: Can not perform this action after onSaveInstanceState</code> error and I couldn't find any good solution about it but just this method <code>commitAllowingStateLoss()</code>. I changed commit function to <code>commitAllowingStateLoss()</code> but didn't use it long time to test so may this function help me? And the main question, what is the difference between <code>commit()</code> and <code>commitAllowingStateLoss()</code>?</p>


I have a method which takes a variable length string (String...) as parameter. I have a `List&lt;String&gt;` with me. How can I pass this to the method as argument?

How to convert a List to variable argument parameter java

I have a package structure: com.report.domain.model

I would like to change it to com.reporting.domain.model. When I select *Refactor* → *Rename* on package com.report.domain.model, I only see an option to rename &#39;model&#39;. I have tried switching between *Project* view and *Package*, but to no avail. I know how to make this change in Eclipse via Navigator view, but how can I do the same in IntelliJ IDEA?


How can I change top level package name in IntelliJ IDEA?

How does this new interface model works and what is about

 - the diamond problem that might arise out of this
 - multiple inheritance character of this implementation
 - and the precedence with which the interface implementations are used
?

How does Java 8&#39; new default interface model works (incl. diamond, multiple inheritance, and precedence)?

I just installed IntelliJ IDEA and when I try to create my first Project it asks for me to set up the Project SDK. When I click on &quot;JDK&quot; it asks for me to select the home directory of the JDK as shown in this image.

![enter image description here][1]
  
I&#39;m having trouble locating where it is.


  [1]: http://i.stack.imgur.com/nUsmm.png

How to set IntelliJ IDEA Project SDK

What and when is the best scenario to use DiscriminatorValue annotation in hibernate?

When to use DiscriminatorValue annotation in hibernate

In my application am using date picker to set date.i want to set date picker maximum date is as today date according to system date.i don&#39;t know how to set date picker maximum date as today date.Can any one know help me to solve this problem.

**My date picker coding is:**

    private int pYear;
	private int pMonth;
	private int pDay;
    static final int DATE_DIALOG_ID = 0;

    final Calendar c = Calendar.getInstance();
	pYear = c.get(Calendar.YEAR);
	pMonth = c.get(Calendar.MONTH);
	pDay = c.get(Calendar.DAY_OF_MONTH);

    // Date picker
	public Dialog onCreateDialog(int id) {
		switch (id) {
		case DATE_DIALOG_ID:

			DatePickerDialog.OnDateSetListener pDateSetListener = new DatePickerDialog.OnDateSetListener() {

				public void onDateSet(DatePicker view, int year,
						int monthOfYear, int dayOfMonth) {

					pYear = year;
					pMonth = monthOfYear;
					pDay = dayOfMonth;

					e_dob.setText(new StringBuilder()
							// to set date in editext
							.append(pDay).append(&quot;/&quot;).append(pMonth + 1)
							.append(&quot;/&quot;).append(pYear).append(&quot; &quot;));
				}
			};
			return new DatePickerDialog(this, pDateSetListener, pYear, pMonth,
					pDay);

		}
		return null;
	}

How set maximum date in datepicker dialog in android?

As suggested to me, I&#39;ve run through a few articles describing how to make IntelliJ Idea and Android and Scala work together, but it turned out they were all written 1 or 2 years ago. And likely, something has changed since that time and now there are other solutions to achieve this goal. Concretely, there is a new solution https://github.com/yareally/android-scala-intellij-no-sbt-plugin for  which I don&#39;t know if it works well or not.

I have IntelliJ Idea 12, Android SDK, Scala, SBT and all other stuff installed and set up. The only thing remaining is to setup IntelliJ Idea 12 to make it work with Scala instead of Java for creating Android applications. 

Please don&#39;t close the question. I saw the previous questions similar to mine, but, as I said, they were outdated.

The question is, how do I do it **now (May 2013)**?

P.S. I tried Android Development Studio but I even wasn&#39;t able to launch it due to many errors.

IntelliJ Idea 12 + Android + Scala nowadays

Is it possible to know if some activity has been called for result, using `startActivityForResult()` or if was only started using `startActivity()`?

I need to control this, if its called for result the behaviour will be different.

Check If Activity Has Been Called for Result

I am making an app in Android Studio, now trying to debug it through adb. When I click on the word Android and the logo on the bottom bar, logcat comes up and recognizes my device. Then I see this: 

![screenshot](http://imgur.com/x2AWGWJ.jpg)

What do I need to do to my app to make it &quot;debuggable&quot;?

FYI was developing this app in Eclipse before and adb worked fine.

Not Able To Debug App In Android Studio

I have downloaded some library sources  and would like to export it as a Jar file using
Android Studio. Is there a way to export to jar file using Android studio ?


edit: 

The library I want to export as jar is an Android library.
It&#39;s called &quot;StandOut&quot; and can be downloaded from GitHub. 
https://github.com/pingpongboss/StandOut





How to export library to Jar in Android Studio?

I&#39;m trying to make an app that has a `ViewPager` in a Fragment that is part of a `TabHost`. Everything works out fine. I have my tabbar, I can switch tabs. When I switch to the tab with the `ViewPager`, all is shown correctly.

However, as soon as I leave this tab with the `ViewPager` and return this tab, my content is not shown. If I scroll to the side twice I do see my next image and if I go back two times I also see the images are loaded (probably the `offscreenloaded`).

See that my `TabFragment` is being reinstantiated when I return to it but the fragments in the `ViewPager` aren&#39;t.

    @Override
	public void onActivityCreated(Bundle savedInstanceState) {

		mProjectText = (TextView) getView().findViewById(R.id.projectText);
		mProjectText.setText(mActiveProject.getInspirationText());
		
		mAdapter = new AlbumAdapter(getFragmentManager(), mActiveProject.getInspiration());
		
        mPager = (ViewPager)getView().findViewById(R.id.pager);
        mPager.setAdapter(mAdapter);

		super.onActivityCreated(savedInstanceState);
	}

    public class AlbumAdapter extends FragmentStatePagerAdapter {

	private ArrayList&lt;ProjectContent&gt; mItems;
	
	public AlbumAdapter(FragmentManager fm, ArrayList&lt;ProjectContent&gt; items) {
		super(fm);
		this.mItems = items;
	}

	@Override
	public Fragment getItem(int position) {
		return AlbumContentFragment.newInstance(mItems.get(position));
	}

	@Override
	public int getCount() {
		return mItems.size();
	}
	
	@Override
	public int getItemPosition(Object object) {
		return POSITION_NONE;
	}}

[![The mockup for the app][1]][1]


  [1]: http://i.stack.imgur.com/4BArG.jpg

ViewPager in TabFragment is not loading a second time

hi how to clear fragment back stack am using below logic it&#39;s not working...


    for(int i = 0; i &lt; mFragmentManager.getBackStackEntryCount(); ++i) {    		
		 mFragmentManager.popBackStack();
	}

help me..

How to clear Fragment backstack in android

When using the Navigation Drawer the Android devs are recommending that in the ActionBar &quot;only those screens that are represented in the Navigation Drawer should actually have the Navigation Drawer image&quot; and that &quot;all other screens have the traditional up carat.&quot; 

See here for details: http://youtu.be/F5COhlbpIbY


I&#39;m using one activity to control multiple levels of fragments and can get the Navigation Drawer image to display and function at all levels.


When creating lower level fragments I can call the `ActionBarDrawerToggle` `setDrawerIndicatorEnabled(false)` to hide the Navigation Drawer image and have the Up caret displayed 

    LowerLevelFragment lowFrag = new LowerLevelFragment();

    //disable the toggle menu and show up carat
    theDrawerToggle.setDrawerIndicatorEnabled(false);
    getSupportFragmentManager().beginTransaction().replace(R.id.frag_layout, 
    lowFrag, &quot;lowerFrag&quot;).addToBackStack(null).commit();


The problem I&#39;m having is when I navigate back to the top level fragments the Up carat still shows instead of the original Navigation Drawer image. Any suggestions on how to &quot;refresh&quot; the ActionBar on the top level fragments to re-display the Navigation Drawer image? 

&lt;hr&gt;
&lt;h2&gt;Solution&lt;/h2&gt;
Tom&#39;s suggestion worked for me.  Here’s what I did:

&lt;h3&gt;MainActivity&lt;/h3&gt;
This activity controls all fragments in the app.

When preparing new fragments to replace others, I set the DrawerToggle `setDrawerIndicatorEnabled(false)` like this:

    LowerLevelFragment lowFrag = new LowerLevelFragment();
    	
    //disable the toggle menu and show up carat
    theDrawerToggle.setDrawerIndicatorEnabled(false);
    getSupportFragmentManager().beginTransaction().replace(R.id.frag_layout,   
    lowFrag).addToBackStack(null).commit();

Next, in an override of `onBackPressed`, I reverted the above by setting the DrawerToggle to `setDrawerIndicatorEnabled(true)` like this:


    @Override
    public void onBackPressed() {
        super.onBackPressed();
        // turn on the Navigation Drawer image; 
        // this is called in the LowerLevelFragments
        setDrawerIndicatorEnabled(true)
    }

&lt;hr&gt;

&lt;h3&gt;In the LowerLevelFragments&lt;/h3&gt; 
In the fragments I modified `onCreate` and `onOptionsItemSelected` like this:

In `onCreate` added `setHasOptionsMenu(true)` to enable configuring the options menu. Also set `setDisplayHomeAsUpEnabled(true)` to enable the &lt;b&gt;&lt;&lt;/b&gt; in the actionbar:

	@Override
	public void onCreate(Bundle savedInstanceState) {
	    super.onCreate(savedInstanceState);
	    // needed to indicate that the fragment would 
	    // like to add items to the Options Menu		
	    setHasOptionsMenu(true);	
	    // update the actionbar to show the up carat/affordance 
	    getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
	}

Then in `onOptionsItemSelected` whenever the &lt;b&gt;&lt;&lt;/b&gt; is pressed it calls the `onBackPressed()` from the activity to move up one level in the hierarchy and display the Navigation Drawer Image:

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {	
        // Get item selected and deal with it
        switch (item.getItemId()) {
            case android.R.id.home:
                //called when the up affordance/carat in actionbar is pressed
                getActivity().onBackPressed();
                return true;
            … 
        }





Switching between Android Navigation Drawer image and Up caret when using fragments

I am developing an app that supports Android &gt;= 4.0. It uses fragments from the `android.app` package. As I am facing problems with the older fragment implementation in 4.0, like [this one][1], that are already fixed in the support library, I am considering switching back to the fragment implementation from the support library to get a more reliable and consistent implementation.

What is your opinion on this? Are you using fragments from the support library, even though they are already available, when developing for Android 4?


  [1]: https://stackoverflow.com/questions/13540712/app-crashes-on-super-onsaveinstancestate

Fragment or Support Fragment?

I am currently making an android app, and I want to pass a date between activity and fragment.
My activity has a button, which opens the fragment: DatePickerFragment.

In my activity I show a date, which I want to modify with the fragment. So I want to pass the date to the datepicker, and send it back to the activity.

I&#39;ve tried a lot of solutions, but none are working. The easy way would pass an argument, but this can&#39;t be done with fragments.

Content Type	Original Author	Original Content on Stackoverflow
Question	Mert Aydin	View Question on Stackoverflow
Solution 1 - Java	Alex Lockwood	View Answer on Stackoverflow
Solution 2 - Java	Jitesh Mohite	View Answer on Stackoverflow

What is the difference between commit() and commitAllowingStateLoss() in Fragments

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

php call class function by string name

How to decrypt OpenSSL AES-encrypted files in Python?

Attributions