Android device screens are rectangles. Rectangles have two sides, one shorter than the other. Let&#39;s call the short one A and the long one B.

`-swNNNdp` indicates &quot;use these resources if A is greater than or equal to NNN `dp` in length&quot;

`-wNNNdp` indicates &quot;use these resources if the width of the device, as presently held, is greater than or equal to NNN `dp`&quot;

When the user rotates the device between portrait and landscape, the width will change (to be A or B), but A (the shortest width) is always the same.


Please take a look at [Screen Support][1]

According to the documentations :

**SW** : The fundamental size of a screen, as indicated by the shortest dimension of the available screen area. Specifically, the device&#39;s smallestWidth is the shortest of the screen&#39;s available height and width (you may also think of it as the &quot;smallest possible width&quot; for the screen). You can use this qualifier to ensure that, regardless of the screen&#39;s current orientation, your application&#39;s has at least &lt;N&gt; dps of width available for it UI.

while **W** : Specifies a minimum available width in dp units at which the resources should be used—defined by the &lt;N&gt; value. The system&#39;s corresponding value for the width changes when the screen&#39;s orientation switches between landscape and portrait to reflect the current actual width that&#39;s available for your UI.


In my words :

**SW** : minimum distance between screen edges in dps your layout will run on, so if you use layout-sw600dp/ folder then all layouts inside it will only work on devices that has at least 600dp (width or height)


**W** : means your layout will work on any device with n dp width regardless of the height or maybe the device currently in landscape mode (in this case w would refer to the height .. since orientation differs between landscape and portrait)

  [1]: http://developer.android.com/guide/practices/screens_support.html

It is working well is there any other better way to remove duplicates from one array if it has elements of another array ?.


    &lt;script&gt;
    var array1 = new Array(&quot;a&quot;,&quot;b&quot;,&quot;c&quot;,&quot;d&quot;,&quot;e&quot;,&quot;f&quot;);
    var array2 = new Array(&quot;c&quot;,&quot;e&quot;);
     
    for (var i = 0; i&lt;array2.length; i++) {
    	var arrlen = array1.length;
    	for (var j = 0; j&lt;arrlen; j++) {
    		if (array2[i] == array1[j]) {
    			array1 = array1.slice(0, j).concat(array1.slice(j+1, arrlen));
    		}
    	}
    }
    alert(array1);
    
    &lt;/script&gt;



Compare two Javascript Arrays and remove Duplicates

When reading the following [helpfile](http://stat.ethz.ch/R-manual/R-patched/library/base/html/colnames.html) it should be possible to add a prefix to the column names :

    colnames(x, do.NULL = TRUE, prefix = &quot;col&quot;)

The following doesn&#39;t work for me. What am I doing wrong here?

    m2 &lt;- cbind(1,1:4)
    colnames(m2, do.NULL = FALSE)
    colnames(m2) &lt;- c(&quot;x&quot;,&quot;Y&quot;)
    colnames(m2) &lt;- colnames(m2, prefix = &quot;Sub_&quot;)
    colnames(m2)

Add a prefix to column names

Please elaborate on the difference between `sw&lt;N&gt;dp` and `w&lt;N&gt;dp`, in a simple way. I have studied the complete documentation of screen sizes but am confused between these two qualifiers **sw&lt;&gt;** and **w&lt;&gt;**.

Difference between sw600dp and w600dp?

Please elaborate on the difference between <code>sw&#x3C;N>dp</code> and <code>w&#x3C;N>dp</code>, in a simple way. I have studied the complete documentation of screen sizes but am confused between these two qualifiers sw&#x3C;> and w&#x3C;>.

&lt;b&gt;Prelude&lt;/b&gt;

I&#39;m trying to add a chronometer on the notification. The chronometer is a service. Every second this line is called (continue Thread is a the &quot;running&quot; boolean, timeString is the elaborated String showing the time):

    NotificationChrono.updateNotification(getApplicationContext(), continueThread, 
    NOTIF_ID, timeString, &quot;Chronometer&quot;, notificationManager);

This is the NotificationChrono class:

    public class NotificationChrono {

        static public void updateNotification(Context context, boolean running,
			int id, String title, String text,
			NotificationManager notificationManager) {

            Intent stopIntent = new Intent(&quot;com.corsalini.david.barcalc.STOP&quot;);
            PendingIntent stopPendingIntent = PendingIntent.getBroadcast(context,
				0, stopIntent, 0);

		Intent startIntent = new Intent(
				&quot;com.corsalini.david.barcalc.STARTPAUSE&quot;);
		PendingIntent startPendingIntent = PendingIntent.getBroadcast(context,
				0, startIntent, 0);

		NotificationCompat.Builder builder = new NotificationCompat.Builder(
				context)

				.setContentText(context.getString(R.string.notif_text))

				.setContentTitle(title)

				.setSmallIcon(R.drawable.ic_action_alarm_2)

				.setAutoCancel(false)

				.setOngoing(running)

				.setOnlyAlertOnce(true)

				.setContentIntent(
						PendingIntent.getActivity(context, 10, new Intent(
								context, FrontActivity.class)
								.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP), 0))
				.addAction(
						running ? R.drawable.ic_action_pause
								: R.drawable.ic_action_play,
						running ? context.getString(R.string.pause) : context
								.getString(R.string.start), startPendingIntent)
				.addAction(R.drawable.ic_action_stop,
						context.getString(R.string.stop), stopPendingIntent);

		notificationManager.notify(id, builder.build());
	}
    }

&lt;b&gt;Problem&lt;/b&gt;

Every second the notification is deleted and recreated, visually it means that every second the notification disappears and reappears in the notification list. 

What I would want is to just update the TITLE text, not recreating the notification entirely every second. Is it possible?

Update text of notification, not entire notification

Here&#39;s the scenario: Activity contains fragment `A`, which in turn uses `getChildFragmentManager()` to add fragments `A1` and `A2` in its `onCreate` like so:

    getChildFragmentManager()
      .beginTransaction()
      .replace(R.id.fragmentOneHolder, new FragmentA1())
      .replace(R.id.fragmentTwoHolder, new FragmentA2())
      .commit()


So far, so good, everything is running as expected.

We then run the following transaction in the Activity: 

    getSupportFragmentManager()
      .beginTransaction()
      .setCustomAnimations(anim1, anim2, anim1, anim2)
      .replace(R.id.fragmentHolder, new FragmentB())
      .addToBackStack(null)
      .commit()

During the transition, the `enter` animations for fragment `B` runs correctly but **fragments A1 and A2 disappear entirely**. When we revert the transaction with the Back button, they initialize properly and display normally during the `popEnter` animation.

In my brief testing, it got weirder - if I set the animations for the child fragments (see below), the `exit` animation runs intermittently when we add fragment `B`

    getChildFragmentManager()
      .beginTransaction()
      .setCustomAnimations(enter, exit)
      .replace(R.id.fragmentOneHolder, new FragmentA1())
      .replace(R.id.fragmentTwoHolder, new FragmentA2())
      .commit()

The effect I want to achieve is simple - I want the `exit` (or should it be `popExit`?) animation on fragment `A` (anim2) to run, animating the whole container, including its nested children. 

Is there any way to achieve that?

**Edit**: Please find a test case [here][1]

**Edit2**: Thanks to @StevenByle for pushing me to keep trying with the static animations. Apparently you can set animations on a per-op basis (not global to the whole transaction), which means the children can have an indefinite static animation set, while their parent can have a different animation and the whole thing can be committed in one transaction. See the discussion below and the [updated test case project][1].

  [1]: https://github.com/BurntBrunch/NestedFragmentsAnimationsTest

Nested fragments disappear during transition animation

I&#39;ve been using ArrayList recently in my android project at the office and I&#39;m a bit confused between List and ArrayList, what is the difference of the two and what should I use?

Also I saw some implementations of it like.



    List&lt;SomeObject&gt; myList = new ArrayList&lt;SomeObject&gt;();
    
    ArrayList&lt;SomeObject&gt; myList = new ArrayList&lt;SomeObject&gt;();

What is the difference of those two instances?





What is the difference between List and ArrayList?

What is difference between Android margin start and right (or margin end and left)?

It is trivial question, but I cannot seem to learn from [the documention](http://developer.android.com/reference/android/view/ViewGroup.MarginLayoutParams.html) what is difference between view start/end and left/right. It could be that I just don&#39;t understand something, but I cannot make any progress with this at all.

What is the difference between Android margin start/end and right/left?

I have been having this problem in an application I am building. Please ignore all of the design shortcomings and lack of best practice approaches, this is purely to show an example of what I cannot solve.

I have `DialogFragment` which returns a basic `AlertDialog` with a custom `View` set using `AlertDialog.Builder.setView()`. If this `View` has a specific size requirement, how do I get the `Dialog` to correctly resize itself to display all of the content in the custom `View`?

This is the example code I have been using:

    package com.test.test;
    
    import android.os.Bundle;
    import android.app.Activity;
    import android.app.AlertDialog;
    import android.app.Dialog;
    import android.app.DialogFragment;
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.graphics.Paint.Style;
    import android.view.Gravity;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.WindowManager;
    import android.view.View.OnClickListener;
    import android.view.ViewGroup;
    import android.view.ViewGroup.LayoutParams;
    import android.widget.ArrayAdapter;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.FrameLayout;
    import android.widget.LinearLayout;
    import android.widget.Spinner;
    import android.widget.TextView;
    
    public class MainActivity extends Activity {
    	
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    			
    		// Use a button for launching
    		Button b = new Button(this);
    		b.setText(&quot;Launch&quot;);
    		b.setOnClickListener(new OnClickListener() {	
    			@Override
    			public void onClick(View v) {
    				// Launch the dialog
    				myDialog d = new myDialog();
    				d.show(getFragmentManager(), null);
    			}
    		});
    		
    		setContentView(b);
    	}
    	
    	public static class myDialog extends DialogFragment {
    		
    		@Override
    		public Dialog onCreateDialog(Bundle savedInstanceState) {			
    			// Create the dialog
    			AlertDialog.Builder db = new AlertDialog.Builder(getActivity());
    			db.setTitle(&quot;Test Alert Dialog:&quot;);
    			db.setView(new myView(getActivity()));
    			
    			return db.create();
    		}
    		
    		protected class myView extends View {
    			Paint p = null;
    			
    			public myView(Context ct) {
    				super(ct);
    
    				// Setup paint for the drawing
    				p = new Paint();
    				p.setColor(Color.MAGENTA);
    				p.setStyle(Style.STROKE);
    				p.setStrokeWidth(10);
    			}
    			
    			@Override
    			protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    				setMeasuredDimension(800, 300);
    			}
    			
    			@Override
    			protected void onDraw(Canvas canvas) {
    				// Draw a rectangle showing the bounds of the view
    				canvas.drawRect(0, 0, getMeasuredWidth(), getMeasuredHeight(), p);
    			}
    		}
    	}
    }

A `Button` is created, which opens the `DialogFragment` on a click. The custom `View` (`myView`) is required to have a width of 800 and height of 300 which is correctly set in an override of `onMeasure()`. This `View`, draws its measured bounds in magenta for debugging purposes.

The 800 width is wider than the default `Dialog` size on my device, but is clipped rather than stretching correctly.

I have looked through the following solutions:

 - https://stackoverflow.com/questions/8456143/dialogfragment-getdialog-returns-null
 - https://stackoverflow.com/questions/4406804/how-to-control-the-width-and-height-of-default-alert-dialog-in-android
 - https://stackoverflow.com/questions/8835931/size-of-alert-dialog-or-custom-alert-dialog

I have deduced the following two coding approaches:

 1. Get the `WindowManager.LayoutParams` of the `Dialog` and override them using `myDialog.getDialog().getWindow().get/setAttributes()`
 2. Using the `setLayout(w, h)` method through `myDialog.getDialog().getWindow().setLayout()`

I have tried them everywhere I can think of (overriding `onStart()`, in a `onShowListener`, after the `Dialog` is created and shown, etc) and can generally get both methods to work correctly if the `LayoutParams` are supplied a **specific value**. But whenever `WRAP_CONTENT` is supplied, nothing happens.

Any suggestions?

**EDIT:**

Screenshot of the situation:
![enter image description here][1]

Screenshot of a specific value (note 900 is entered here, 850 doesn&#39;t cover the entire width of the View, which makes sense given the entire window is being adjusted. So that provides - if another was needed - reason why `WRAP_CONTENT` is essential / fixed values are not appropriate):
![enter image description here][2]


  [1]: http://i.stack.imgur.com/7161w.png
  [2]: http://i.stack.imgur.com/F4Qnc.png

AlertDialog with custom view: Resize to wrap the view&#39;s content

I am trying to check to see whether the android navigation bar is present on load so that I can adjust a layout accordingly, does anyone have any suggestions?

This is the navigation bar I am trying to detect:
![enter image description here][1]

P.S. All I have found so far are &#39;bad&#39; ways to try and remove the bar, which I dont want to do.


  [1]: http://i.stack.imgur.com/N63wE.png

Check for navigation bar

How can I make a layout with rounded corners? I want to apply rounded corners to my ``LinearLayout``.

How to make layout with rounded corners..?

What&#39;s the difference between `android:textAlignment` and `android:gravity`?

Text/Layout Alignment in Android (textAlignment, gravity)

I just noticed the iOS 6/7 Delta property found under the UIView&#39;s structs layout.

What is this for and why is this missing from AutoLayout?

![enter image description here][1]


  [1]: http://i.stack.imgur.com/E7Su3.png

Interface Builder: What are the UIView&#39;s Layout iOS 6/7 Deltas for?

I have a layout hidden from the view. On a button click I want it to slide up from the bottom pushing the entire screen contents upwards, very similar to how whatsapp shows emoticons panel in chat screen. 

I have seen SlidingDrawer, that dosen&#39;t work for me. It requires an image as an handle which is shown at the center of the screen, I don&#39;t want that. It also slides over the existing screen content, I am looking for a way to move the existing content upwards.

**Update 1:**

I tried using the animations as suggested by Sanket Kachhela. But the hidden layout is never shown. Here is the code.

**Layout (activity_main.xml):**
&lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    xmlns:tools=&quot;http://schemas.android.com/tools&quot;
    android:layout_width=&quot;match_parent&quot;
    android:layout_height=&quot;match_parent&quot;
    android:paddingBottom=&quot;@dimen/activity_vertical_margin&quot;
    android:paddingLeft=&quot;@dimen/activity_horizontal_margin&quot;
    android:paddingRight=&quot;@dimen/activity_horizontal_margin&quot;
    android:paddingTop=&quot;@dimen/activity_vertical_margin&quot;
    tools:context=&quot;.MainActivity&quot; &gt;
    
    &lt;RelativeLayout
        android:id=&quot;@+id/main_screen&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot; &gt;
	
	    &lt;TextView
	        android:layout_width=&quot;wrap_content&quot;
	        android:layout_height=&quot;wrap_content&quot;
	        android:text=&quot;@string/hello_world&quot; 
	        android:layout_alignParentTop=&quot;true&quot;/&gt;
	    
		 &lt;TextView
		   android:layout_width=&quot;wrap_content&quot;
		   android:layout_height=&quot;wrap_content&quot;
		   android:text=&quot;@string/hello_world&quot; 
		   android:layout_centerInParent=&quot;true&quot;/&gt;
	        
	    &lt;Button
			android:layout_width=&quot;wrap_content&quot;
			android:layout_height=&quot;wrap_content&quot;
			android:text=&quot;Slide up / down&quot;
			android:layout_alignParentBottom=&quot;true&quot; 
			android:onClick=&quot;slideUpDown&quot;/&gt;
    
	&lt;/RelativeLayout&gt;
	
    &lt;RelativeLayout
        android:id=&quot;@+id/hidden_panel&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot; 
        android:layout_below=&quot;@id/main_screen&quot;&gt;
	
        &lt;Button
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:text=&quot;@string/app_name&quot; /&gt;

    &lt;/RelativeLayout&gt;

&lt;/RelativeLayout&gt;

**Activity (MainActivity.java):**

    package com.example.slideuplayout;

    import android.app.Activity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.View;
    import android.view.ViewGroup;
    import android.view.animation.Animation;
    import android.view.animation.AnimationUtils;

    public class MainActivity extends Activity {
	
	private ViewGroup hiddenPanel;
	private boolean isPanelShown;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		hiddenPanel = (ViewGroup)findViewById(R.id.hidden_panel);
		hiddenPanel.setVisibility(View.INVISIBLE);
		isPanelShown = false;
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	public void slideUpDown(final View view) {
		if(!isPanelShown) {
			// Show the panel
			Animation bottomUp = AnimationUtils.loadAnimation(this,
		            R.anim.bottom_up);
		
			hiddenPanel.startAnimation(bottomUp);
			hiddenPanel.setVisibility(View.VISIBLE);
			isPanelShown = true;
		}
		else {
			// Hide the Panel
			Animation bottomDown = AnimationUtils.loadAnimation(this,
		            R.anim.bottom_down);
		
			hiddenPanel.startAnimation(bottomDown);
			hiddenPanel.setVisibility(View.INVISIBLE);
			isPanelShown = false;
		}
	}

    }

**Animations:**

bottom_up.xml:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
     &lt;set xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;translate 
	       android:fromYDelta=&quot;75%p&quot;
	       android:toYDelta=&quot;0%p&quot;
	       android:fillAfter=&quot;true&quot;
	       android:duration=&quot;500&quot; /&gt;
    &lt;/set&gt;

bottom_down.xml:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
     &lt;set xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
	&lt;translate 
	    android:fromYDelta=&quot;0%p&quot; 
	    android:toYDelta=&quot;100%p&quot; 
	    android:fillAfter=&quot;true&quot;
	    android:interpolator=&quot;@android:anim/linear_interpolator&quot;
	    android:duration=&quot;500&quot; /&gt;
    &lt;/set&gt;


Any ideas how this can be done ?

Thanks.


Content Type	Original Author	Original Content on Stackoverflow
Question	Mudassar Shaheen	View Question on Stackoverflow
Solution 1 - Android	CommonsWare	View Answer on Stackoverflow
Solution 2 - Android	Mr.Me	View Answer on Stackoverflow

Difference between sw600dp and w600dp?

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Add a prefix to column names

Compare two Javascript Arrays and remove Duplicates

Attributions