Android radion button,Android AbsoluteLayout

For android radion button you need to create a RadioGroup. From each group
maximum one item can be selected.
Here you also find how get selected radio button.
In this example i used AbsoluteLayout for better positioning.


//main.xml

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

 <TextView android:id="@+id/myTextViev" android:layout_width="wrap_content"
  android:layout_height="wrap_content" android:text="Choose Dictionary:"
  android:layout_x="20px" android:layout_y="250px" />

 <RadioGroup xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="horizontal" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <RadioButton android:id="@+id/radio1"
   android:layout_width="wrap_content" android:layout_height="wrap_content"
   android:text="Rock" />

  <RadioButton android:id="@+id/radio2"
   android:layout_width="wrap_content" android:layout_height="wrap_content"
   android:text="Scissors" />

  <RadioButton android:id="@+id/radio3"
   android:layout_width="wrap_content" android:layout_height="wrap_content"
   android:text="Paper" />
 </RadioGroup>
 <Button android:id="@+id/myButton" android:layout_width="100px"
  android:layout_height="50px" android:text="Submit" android:layout_x="5px"
  android:layout_y="60px" />

</AbsoluteLayout>

//AndroidRadioButton.java

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.TextView;

public class AndroidRadioButton extends Activity implements OnClickListener{
    
 TextView tv;
 Button btn;
 /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        btn = (Button) findViewById(R.id.myButton);
        btn.setOnClickListener(this);
        
        tv = (TextView) findViewById(R.id.myTextViev);
        tv.setText("This is sample text");
        
        
    }

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  RadioButton ra=(RadioButton)findViewById(R.id.radio1);
  RadioButton rb=(RadioButton)findViewById(R.id.radio2);
  RadioButton rc=(RadioButton)findViewById(R.id.radio3);
  if (v.getId() == R.id.myButton) {
   if(ra.isChecked()){
    tv.setText("Rock selected");
   }
   if(rb.isChecked()){
    tv.setText("Scissors selected");
   }
   if(rc.isChecked()){
    tv.setText("Paper selected");
   }
  }
 }
}

output:

select any item of radio button and then click submit button (let i select Scissors radio button),
now output will be

Android button/Android button action/AbsoluteLayout/Positioning

This example is very similar to my previous example on button action.

Here main difference is positioning your sereen UI component using AbsoluteLayout.
By using android AbsoluteLayout we can easily make positioning.We can positioning using xml or from code.
In this example i showed both.


//my_button_interface.xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
     >
 <TextView 
  android:id="@+id/myTextViev"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_x="20px"
  android:layout_y="200px"
 />
    <Button 
     android:id="@+id/myButton"
  android:layout_width="100px"
  android:layout_height="50px"
  android:text="Submit" 
 />
</AbsoluteLayout>

//HelloWorldAndroid.java

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AbsoluteLayout;
import android.widget.Button;
import android.widget.TextView;

public class AndroidButton extends Activity implements OnClickListener {
 /** Called when the activity is first created. */
  
 Button btn;
 TextView tv;
  
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.my_button_interface);
     
  btn = (Button) findViewById(R.id.myButton);
  tv = (TextView) findViewById(R.id.myTextViev);
  
  AbsoluteLayout.LayoutParams layoutParams= new
                AbsoluteLayout.LayoutParams(100,50, 200, 200);
  btn.setLayoutParams(layoutParams);
     
  tv.setText("This is sample text");
  btn.setOnClickListener(this);
 }

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  if (v.getId() == R.id.myButton) {
   tv.setText("welcome to AbsoluteLayout");
  }
 }
}

output:



Before click button





After click button