Programmatically set height and width of Relative and Linear Layout in android

Are you faced to set height and width of Relative layout and Linear layout programmtically in android, here is the simple solution to set height and width of layouts.

First, we have to get height and width of screen and then do these things
 // getting screen size of mobile or tablet devices
 Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int width = size.x;
        int height = size.y;
Or

      Display display = getWindowManager().getDefaultDisplay();
      int width = display.getWidth();
      int height = display.getHeight();

Or

     DisplayMetrics metrics = new DisplayMetrics();
     getWindowManager().getDefaultDisplay().getMetrics(metrics);

     metrics.heightPixels;
     metrics.widthPixels;



Linear Layout:
--------------

    final LinearLayout linearLeft = (LinearLayout) findViewById(R.id.left);
    LayoutParams params = linearLeft .getLayoutParams();
// Changes the height and width to the specified *pixels*
    params.width = screenWidth / 2;
 
 
Relative Layout
---------------------
    final RelativeLayout relavtiveLeft = (RelativeLayout) findViewById(R.id.right);
    LayoutParams homeLayoutsparams = relavtiveLeft .getLayoutParams();
    homeLayoutsparams.width = screenWidth / 2;

Happy coding !!!

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How to make EditText not editable in android

EditText is a thin veneer over TextView that configures itself to be editable.
  
Here is the simple code for make not editable or disable in android;

edittext.setKeyListener(null);

or 

edittext.setFocusable(false);
edittext.setClickable(true);

More about EditText. 

Happy Coding!!!

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How to create RelativeLayout programmatically in android

Android RelativeLayout enables you to specify how child views are positioned relative to each other. The position of each view can be specified as relative to sibling elements or relative to the parent.

RelativeLayout is a view group that displays child views in relative positions. The position of each view can be specified as relative to sibling elements (such as to the left-of or below another view) or in positions relative to the parent RelativeLayout area (such as aligned to the bottom, left of center).

 you have to add the view using LayoutParams.

LinearLayout linearLayout = new LinearLayout(this);

RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
relativeParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);

parentView.addView(linearLayout, relativeParams);


All credit to sechastain, to relatively position your items programmatically you have to assign ids to them.

TextView tv1 = new TextView(this);
tv1.setId(1);
TextView tv2 = new TextView(this);
tv2.setId(2);
Then addRule(RelativeLayout.RIGHT_OF, tv1.getId());

and  you have to add this way too

With relative layout you position elements inside the layout.

create a new RelativeLayout.LayoutParams

RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(...)

(whatever... fill parent or wrap content, absolute numbers if you must, or reference to an XML resource)

Add rules: Rules refer to the parent or to other "brothers" in the hierarchy.

lp.addRule(RelativeLayout.BELOW, someOtherView.getId())
lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT)
Just apply the layout params: The most 'healthy' way to do that is:

parentLayout.addView(myView, lp)


More:

http://developer.android.com/guide/topics/ui/layout/relative.html

http://developer.android.com/reference/android/widget/RelativeLayout.html

http://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html

http://www.tutorialspoint.com/android/android_relative_layout.htm


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What is the difference between gravity and layout_gravity in android?


android:gravity sets the gravity of the content of the View its used on.
android:layout_gravity sets the gravity of the View or Layout in its parent.
And an example is here

Here is the defination of gravity  Standard constants and tools for placing an object within a potentially larger container. in developer.android.com and more http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html

android:layout_gravity is the Outside gravity of the View. That means, to specify the direction in which the View should touch it's parent's border.

android:gravity is the Inside gravity of that View. This means, in which direction it's contents should align.

HTML/CSS Equivalents:

android:layout_gravity = float in CSS
android:gravity = text-align in CSS

Easy trick to remember: Take "layout-gravity" as "Lay-outside-gravity"

below examples show difference between layout:gravity and gravity,may be help you. http://sandipchitale.blogspot.com/2010/05/linearlayout-gravity-and-layoutgravity.html


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What is android:layout_weight in Android?

What happens when i set weight =1 for one layout and weight to 2 for other layout.If i have linear layout, here is the simple solutions:

The weight is used to distribute the remaining empty space or take away space when the total sum is larger than the LinearLayout.

Indicates how much of the extra space in the LinearLayout will be allocated to the view associated with these LayoutParams. Specify 0 if the view should not be stretched. Otherwise the extra pixels will be pro-rated among all views whose weight is greater than 0.
Look more about this information click. Here, and  Link1

Layout weight problem

If we are dividing the parent in to equal parts, we just set the children’s layout_weights all to 1. But if we want to divide it unequally, we can do that in a number of ways. We can either use decimal fractional values which total 1, or we can use integer values:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
   <LinearLayout android:background="#FF0000"
    android:layout_height="fill_parent" android:layout_width="fill_parent"
    android:layout_weight="0.66667" />
  <LinearLayout android:background="#00FF00"
    android:layout_height="fill_parent" android:layout_width="fill_parent"
    android:layout_weight="0.33333" />
</LinearLayout>

Or

 <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
   <LinearLayout android:background="#FF0000"
      android:layout_height="fill_parent" android:layout_width="fill_parent"
      android:layout_weight="2" />
    <LinearLayout android:background="#00FF00"
       android:layout_height="fill_parent" android:layout_width="fill_parent"
       android:layout_weight="1" />
  </LinearLayout>

Both of these will produce the same result.

Happy Coding!!!

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How to creating dynamically or programmatically radio buttons in Android

Are you trying to create programmatically radio buttons on android, here is the tutorials may be helpful for you .

Here is the full code:

public class MainActivity extends Activity {
private Button btnWrite;
private LinearLayout ll;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
btnWrite= new Button(getApplicationContext());
btnWrite.setText("ADD Radio Button");
ll= new LinearLayout(getApplicationContext());
btnWrite.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
createDynamicButton();
}
});

ll.addView(btnWrite);
setContentView(ll);
}
protected void createDynamicButton() {

final RadioButton[] rb = new RadioButton[5];
   final RadioGroup rg = new RadioGroup(this); //create the RadioGroup
   rg.setOrientation(RadioGroup.VERTICAL);//or RadioGroup.VERTICAL
   for(int i=0; i<5; i++){
       rb[i]  = new RadioButton(this);
       rg.addView(rb[i]); //the RadioButtons are added to the radioGroup instead of the layout
       rb[i].setText("Radio " + i);
   }
   ll.addView(rg);//you add the whole RadioGroup to the layout
   btnWrite.setOnClickListener(new View.OnClickListener() {
       public void onClick(View v) {
           for(int i = 0; i < 5; i++) { 
               rg.removeView(rb[i]);//now the RadioButtons are in the RadioGroup
           }  
       }
   });

}

}

Output snapshots of above code:

Happy Codding !!!

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How to add a footer in ListView in android

Create a footer view layout consisting of text that you want to set as footer and then try

View footerView = ((LayoutInflater) ActivityContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.footer_layout, null, false);
ListView.addFooterView(footerView);

or may be use this also:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingTop="7dip"
    android:paddingBottom="7dip"
    android:orientation="horizontal"
    android:gravity="center">

    <LinearLayout 
        android:id="@+id/footer_layout" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center"
        android:layout_gravity="center">

    <TextView 
        android:text="@string/footer_text_1" 
        android:id="@+id/footer_1" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:textSize="14dip" 
        android:textStyle="bold" 
        android:layout_marginRight="5dip" />
    </LinearLayout>
</LinearLayout> 

and on activity

public class MyListActivty extends ListActivity {
    private Context context = null;
    private ListView list = null;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        list = (ListView)findViewById(android.R.id.list);

        //code to set adapter to populate list
        View footerView =  ((LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.footer_layout, null, false);
        list.addFooterView(footerView);
    }
}

Happy Coding!!!

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How to access child views from a ListView in android

Are you get lots problems during access child view from a listview in android, then here is the some solution that may helpful for you.

Android ListView: get data index of visible itemand combine with part of Feet's answer above, can give you something like:

int wantedPosition = 10; // Whatever position you're looking for
int firstPosition = listView.getFirstVisiblePosition() - listView.getHeaderViewsCount(); // This is the same as child #0
int wantedChild = wantedPosition - firstPosition;
// Say, first visible position is 8, you want position 10, wantedChild will now be 2
// So that means your view is child #2 in the ViewGroup:
if (wantedChild < 0 || wantedChild >= listView.getChildCount()) {
  Log.w(TAG, "Unable to get view for desired position, because it's not being displayed on screen.");
  return;
}
// Could also check if wantedPosition is between listView.getFirstVisiblePosition() and listView.getLastVisiblePosition() instead.
View wantedView = listView.getChildAt(wantedChild);

this solution copy from stackoverflow and i solved my solution from this:

Happy Coding!!!

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Close or hide the Android Soft Keyboard from code

Are you trying to  make close or hide the Soft Keyboard in your app using code. here is the solution .

Force Android to hide the virtual keyboard using the InputMethodManager, calling hideSoftInputFromWindow, passing in the token of the window containing your edit field.

EditText myEditText = (EditText) findViewById(R.id.myEditText);  
InputMethodManager imm = (InputMethodManager)getSystemService(
      Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(myEditText.getWindowToken(), 0);

This will force the keyboard to be hidden in all situations. In some cases you will want to pass in InputMethodManager.HIDE_IMPLICIT_ONLY as the second parameter to ensure you only hide the keyboard when the user didn't explicitly force it to appear (by holding down menu).

Happy Codting

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How make weblink(hyperlink) in textview in android

Weblink or Hyperlink in textview, simple way to make it:

Textview tv_link= (Textview)findViewById(R.id.tvLink);
tv_link.setText("prandroid@gmail.com");
Linkify.addLinks(tv_link, Linkify.ALL);

or may be use this also:

TextView tvLinkTest= (TextView) findViewById(R.id.tl);
tvLinkTest.setMovementMethod(LinkMovementMethod.getInstance());

next alternative method is:

<TextView
    android:text="www.hello.com"
    android:id="@+id/TextView01"
    android:layout_height="wrap_content" 
    android:layout_width="fill_parent"
    android:autoLink="web">
</TextView>

Happy Coding!!!

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How to create Custom Notification in Android

Customization notification part needed sometimes, that you modified android notification of user request. Here is the sample code for custom notification:

Main.Java code :

public class NotificationToastActivity extends Activity {
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     
Button button = (Button) findViewById(R.id.toast_button);
button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
     
       Toast toast = new Toast(getApplicationContext());

       toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
       toast.setDuration(Toast.LENGTH_LONG);
     
       toast.setView(getLayoutInflater().inflate(R.layout.custom_toast,null));

       toast.show();
}
});

    }
}

main.xml code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/toast_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Show Toast"
        android:textSize="24sp" />

</RelativeLayout>

and final custom_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#0000FF"
    android:orientation="horizontal"
    android:padding="10dp" >

    <ImageView
        android:id="@+id/custom_image"
        android:layout_width="44dp"
        android:layout_height="44dp"
        android:layout_centerVertical="true"
        android:layout_marginRight="10dp"
        android:src="@drawable/custom_image" />

    <TextView
        android:id="@+id/customtext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@id/custom_image"
        android:text="Display, Custom Toast Here"
        android:textColor="#fff"
        android:textSize="15sp" />

</RelativeLayout>

Here is the some snapshots:

Happy Coding!!!

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Create custom button in Android using XML

How to create custom button in android using xml style file . which is placed on drawable folder .

Now, just create shape of the ImageButton to have black shader background.

android:background="@drawable/button_shape"

and the button_shape is the xml file in drawable resource:

    <?xml version="1.0" encoding="UTF-8"?>
<shape 
    xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke 
        android:width="1dp" 
        android:color="#505050"/>
    <corners 
        android:radius="7dp" />

    <padding 
        android:left="1dp"
        android:right="1dp"
        android:top="1dp"
        android:bottom="1dp"/>

    <solid android:color="#505050"/>

</shape>

Happy Coding!!!

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