You shall not keep references around as suggested in the accepted answer. This works, but may cause memory leaks.

Use this instead from your view:

    ((Activity) getContext()).getWindow()...

You have a managed reference to your activity in your view, which you can retrieve using getContext(). Cast it to Activity and use any methods from the activity, such as getWindow().

Pass a reference of the activity when you create the class, and when calling relevant methods and use it.

    void someMethodThatUsesActivity(Activity myActivityReference) {
        myActivityReference.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }

You can use following method to cast current context to activity:

    /**
     * Get activity instance from desired context.
     */
    public static Activity getActivity(Context context) {
        if (context == null) return null;
        if (context instanceof Activity) return (Activity) context;
        if (context instanceof ContextWrapper) return getActivity(((ContextWrapper)context).getBaseContext());
        return null;
    }

Then you can get window from the activity.

kotlin code:
```
myView.rootView.findViewById&lt;View&gt;(android.R.id.content).context as Activity
```

Use 

    getActivity().getWindow().requestFeature(Window.FEATURE_PROGRESS);
It&#39;s will be easier

I&#39;m using the chosen.js plugin http://harvesthq.github.com/chosen/ with jQuery to allow the user to select multiple options from a select. However, I now want to be able to let them *create* values that aren&#39;t already present - any idea how to go about this? 

EDIT: something similar to SO&#39;s own tag selection/creation bar would be close to what I&#39;m after

Preferably without changing or editing the plugin, but will do if required.

The code:
HTML:

    &lt;p&gt;Select something&lt;/p&gt;
    &lt;select name=&quot;theSelect[]&quot; multiple=&quot;multiple&quot;&gt;
        &lt;option value=&quot;First Option&quot;&gt;First Option&lt;/option&gt;
        &lt;option value=&quot;Second Option&quot;&gt;Second Option&lt;/option&gt;
    &lt;/select&gt;

Javascript:

    $(function(){
        $(&#39;select&#39;).chosen();
    });

So if a user were to type in &quot;Third Option&quot;, i&#39;d like to add that to the list and have it selected. The value and display name are / will be the same so that&#39;s not a concern

allow new values with chosen.js multiple select

Is `memset()`  more efficient than `for` loop.

Considering this code:

    char x[500];
    memset(x,0,sizeof(x));

And this one:

    char x[500];
    for(int i = 0 ; i &lt; 500 ; i ++) x[i] = 0;

Which one is more efficient and why? Is there any special instruction in hardware to do block level initialization.

Is memset() more efficient than for loop in C?

I am trying to organize my code and move repetitive functions to a single class.
This line of code works fine inside a class that extends activity:

    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

However it is not working when I try to include it into an external class.

How do I call getWindow() from another class to apply it inside an Activity?


How to call getWindow() outside an Activity in Android?

I am trying to organize my code and move repetitive functions to a single class.
This line of code works fine inside a class that extends activity:
<pre><code class="hljs language-scss">getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
</code></pre>
However it is not working when I try to include it into an external class.
How do I call getWindow() from another class to apply it inside an Activity?

I&#39;m learning java and now i&#39;ve the following problem: I have the main method declared as

    public static void main(String[] args) {
    
    ..... }

Inside my main method, because it is **static** I can call ONLY other static method!!! Why ?

For example: I have another class

     public class ReportHandler { 	 	
         private Connection conn; 	
         private PreparedStatement prep;
         public void executeBatchInsert() { ....
     } }


So in my main class I declare a `private ReportHandler rh = new ReportHandler();`

But I can&#39;t call any method if they aren&#39;t static.

Where does this go wrong?

EDIT: sorry, my question is: how to &#39;design&#39; the app to allow me to call other class from my &#39;starting point&#39; (the `static void main`).


Java: How To Call Non Static Method From Main Method?

I have a String called `persons.name`

I want to replace the DOT `.` with `/*/`  i.e my output will be `persons/*/name`

I tried this code:

    String a=&quot;\\*\\&quot;;
    str=xpath.replaceAll(&quot;\\.&quot;, a);

I am getting StringIndexOutOfBoundsException.

How do I replace the dot?

How to Replace dot (.) in a string in Java

I think it&#39;s a fairly simple question, but I can&#39;t figure out how to do this properly.

I&#39;ve got an empty arraylist:

    ArrayList&lt;object&gt; list = new ArrayList&lt;object&gt;();

I&#39;ve got some objects I want to add and each object has to be at a certain position. It is necessary however that they can be added in each possible order. When I try this, it doesn&#39;t work and I get an `IndexOutOfBoundsException`:

    list.add(1, object1)
    list.add(3, object3)
    list.add(2, object2)

What I have tried is filling the `ArrayList` with `null` and then doing the above. It works, but I think it&#39;s a horrible solution. Is there another way to do this?

Add object to ArrayList at specified index

I have an application as JAR file with many dependencies. For some reason I need to decompile one of the libraries and open it up with Eclipse. For a given interface in the project, is there a way to find the class(s) that implements it? It may be the case that the interface was implemented in other library that I didn&#39;t decompile yet. Is it possible to do this for this kind of classes?

How to find which classes implement a particular interface in Eclipse?

I want to put all my config files in a `/config` subfolder of my application directory. Log4j is expecting the log4j.properties file in the root folder of my application. Is there a way to tell log4j where to look for the properties file? 

Change location of log4j.properties

I&#39;m using the v4 compatibility ViewPager in Android.  My FragmentActivity has a bunch of data which is to be displayed in different ways on different pages in my ViewPager.  So far I just have 3 instances of the same ListFragment, but in the future I will have 3 instances of different ListFragments.  The ViewPager is on a vertical phone screen, the lists are not side-by-side.

Now a button on the ListFragment starts an separate full-page activity (via the FragmentActivity), which returns and FragmentActivity modifies the data, saves it, then attempts to update all views in its ViewPager.  It is here, where I am stuck.

    public class ProgressMainActivity extends FragmentActivity
    {
    	MyAdapter mAdapter;
    	ViewPager mPager;
    	
    	@Override
    	public void onCreate(Bundle savedInstanceState)
    	{
    	...
    		mAdapter = new MyAdapter(getSupportFragmentManager());
    
    		mPager = (ViewPager) findViewById(R.id.viewpager);
    		mPager.setAdapter(mAdapter);
    	}
    	
    	@Override
    	protected void onActivityResult(int requestCode, int resultCode, Intent data)
        {
            ...
            updateFragments();
    		...
        }
    	public void updateFragments()
    	{
    		//Attempt 1:
    		//mAdapter.notifyDataSetChanged();
    		//mPager.setAdapter(mAdapter);
    		
    		//Attempt 2:
    		//HomeListFragment fragment = (HomeListFragment) getSupportFragmentManager().findFragmentById(mAdapter.fragId[0]);
    		//fragment.updateDisplay();
    	}
    	
    	public static class MyAdapter extends FragmentPagerAdapter implements
             TitleProvider
    	{
          int[] fragId = {0,0,0,0,0};
          public MyAdapter(FragmentManager fm)
          {
             super(fm);
          }
          @Override
          public String getTitle(int position){
             return titles[position];
          }
          @Override
          public int getCount(){
             return titles.length;
          }
    
          @Override
          public Fragment getItem(int position)
          {
    		
             Fragment frag = HomeListFragment.newInstance(position);
             //Attempt 2:
    		 //fragId[position] = frag.getId();
             return frag;
          }
          
          @Override
          public int getItemPosition(Object object) {
             return POSITION_NONE; //To make notifyDataSetChanged() do something
         }
       }
       
        public class HomeListFragment extends ListFragment
    	{
    	...
    		public static HomeListFragment newInstance(int num)
    		{
    			HomeListFragment f = new HomeListFragment();
    			...
    			return f;
    		}
       ...

Now as you can see, my first attempt was to notifyDataSetChanged on the entire FragmentPagerAdapter, and this showed to update the data sometimes, but others I got an IllegalStateException: Can not perform this action after onSaveInstanceState.  

My second attempt involed trying to call an update function in my ListFragment, but getId in getItem returned 0.  As per the docs I tried by 

&gt; acquiring a reference to the Fragment from FragmentManager, using
&gt; findFragmentById() or findFragmentByTag()

but I don&#39;t know the tag or id of my Fragments! I have an android:id=&quot;@+id/viewpager&quot; for ViewPager, and a android:id=&quot;@android:id/list&quot; for my ListView in the ListFragment layout, but I don&#39;t think these are useful.

So, how can I either:
a) update the entire ViewPager safely in one go (ideally returning the user to the page he was on before) - it is ok that the user see the view change.
Or preferably,
b) call a function in each affected ListFragment to update the ListView manually.

Any help would be gratefully accepted!

Update data in ListFragment as part of ViewPager

I&#39;m trying to use a `ViewPager` inside of a `ScrollView`, but the `ViewPager` does not appear. If I remove the `ScrollView` the `ViewPager` appears fine.

I&#39;ve created a simple test project with the following:

main.xml layout:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
	android:orientation=&quot;vertical&quot; android:layout_width=&quot;fill_parent&quot;
	android:layout_height=&quot;fill_parent&quot;&gt;
        &lt;ScrollView
            android:layout_width=&quot;fill_parent&quot;
		    android:layout_height=&quot;fill_parent&quot;&gt;

		    &lt;android.support.v4.view.ViewPager
			    android:layout_width=&quot;fill_parent&quot; 
			    android:layout_height=&quot;fill_parent&quot;
			    android:id=&quot;@+id/viewpager&quot; /&gt;

	    &lt;/ScrollView&gt;
    &lt;/LinearLayout&gt;


Activity class:

    public class ScrollViewWithViewPagerActivity extends Activity {
	    @Override
	    public void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        setContentView(R.layout.main);
	        
	        ViewPager vp = (ViewPager) findViewById(R.id.viewpager);
	        vp.setAdapter(new MyPagerAdapter(this));
	    }
	}
	
	class MyPagerAdapter extends PagerAdapter {
	
		private Context ctx;
		
		public MyPagerAdapter(Context context) {
			ctx = context;
		}
	
		@Override
		public int getCount() {
			return 2;
		}
	
		@Override
		public Object instantiateItem(View collection, int position) {
			
			TextView tv =  new TextView(ctx);
			tv.setTextSize(50);
			tv.setTextColor(Color.WHITE);
			tv.setText(&quot;SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, &quot; +
					&quot;SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, &quot; +
					&quot;SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, SMILE DUDE, &quot; +
					&quot;SMILE DUDE, SMILE DUDE, SMILE DUDE&quot;);
	        
	        ((ViewPager) collection).addView(tv);
	        
	        return tv;
	
		}
	
		@Override
		public void destroyItem(View collection, int position, Object view) {
			 ((ViewPager) collection).removeView((View) view);
		}
	
		@Override
		public boolean isViewFromObject(View view, Object object) {
			return view == object;
		}
	
		@Override
		public Parcelable saveState() {
			return null;
		}
	
		@Override
		public void restoreState(Parcelable arg0, ClassLoader arg1) {
		}
	
		@Override
		public void startUpdate(View arg0) {
		}
		
		@Override
		public void finishUpdate(View arg0) {
		}
	}


Thanks for your time.

Is it possible to have a ViewPager inside of a ScrollView?

I have an application in which I need to create a socket connection. My requirement is: once my socket connection is established it needs to be alive until I personally close it. And every 3 minutes I have to send data packets to the other end. Can anyone provide me some code samples that will help me to do this?


how to create Socket connection in Android?

Can somebody explain me in a really simple way what does `FLAG_ACTIVITY_CLEAR_TOP` mean? I know there were a lot of questions about it, but none of the answers satisfied me. Can somebody also give an example where this flag is useful? Thanks.

Content Type	Original Author	Original Content on Stackoverflow
Question	Kalimah	View Question on Stackoverflow
Solution 1 - Java	Oliver Hausler	View Answer on Stackoverflow
Solution 2 - Java	MByD	View Answer on Stackoverflow
Solution 3 - Java	Hexise	View Answer on Stackoverflow
Solution 4 - Java	jsaon chyeng	View Answer on Stackoverflow
Solution 5 - Java	wwahyudi	View Answer on Stackoverflow

How to call getWindow() outside an Activity in Android?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

Solution 5 - Java

Is memset() more efficient than for loop in C?

allow new values with chosen.js multiple select

Attributions