Android Button

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Android Button represents a push-button. The android.widget.Button is subclass of TextView class and CompoundButton is the subclass of Button class.

There are different types of buttons in android such as RadioButton, ToggleButton, CompoundButton etc.

activity_main.xml

  1. <RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
  2.     xmlns:tools="http://schemas.android.com/tools"  
  3.     android:layout_width="match_parent"  
  4.     android:layout_height="match_parent"  
  5.     tools:context=".MainActivity" >  
  6.   
  7.     <EditText  
  8.         android:id="@+id/editText1"  
  9.         android:layout_width="wrap_content"  
  10.         android:layout_height="wrap_content"  
  11.         android:layout_alignParentTop="true"  
  12.         android:layout_centerHorizontal="true"  
  13.         android:layout_marginTop="24dp"  
  14.         android:ems="10" />  
  15.   
  16.     <EditText  
  17.         android:id="@+id/editText2"  
  18.         android:layout_width="wrap_content"  
  19.         android:layout_height="wrap_content"  
  20.         android:layout_alignLeft="@+id/editText1"  
  21.         android:layout_below="@+id/editText1"  
  22.         android:layout_marginTop="34dp"  
  23.         android:ems="10" >  
  24.   
  25.         <requestFocus />  
  26.     </EditText>  
  27.   
  28.     <Button  
  29.         android:id="@+id/button1"  
  30.         android:layout_width="wrap_content"  
  31.         android:layout_height="wrap_content"  
  32.         android:layout_centerHorizontal="true"  
  33.         android:layout_centerVertical="true"  
  34.         android:text="@string/Button" />  
  35.   
  36. </RelativeLayout>  


Activity class

  1. package com.example.sumof2numbers;  
  2.   
  3. import android.os.Bundle;  
  4. import android.app.Activity;  
  5. import android.view.Menu;  
  6. import android.view.View;  
  7. import android.view.View.OnClickListener;  
  8. import android.widget.Button;  
  9. import android.widget.EditText;  
  10. import android.widget.Toast;  
  11.   
  12. public class MainActivity extends Activity {  
  13.     private EditText edittext1,edittext2;  
  14.     private Button buttonSum;  
  15.     @Override  
  16.     protected void onCreate(Bundle savedInstanceState) {  
  17.         super.onCreate(savedInstanceState);  
  18.         setContentView(R.layout.activity_main);  
  19.           
  20.         addListenerOnButton();  
  21.           
  22.     }  
  23.     public void addListenerOnButton(){  
  24.         edittext1=(EditText)findViewById(R.id.editText1);  
  25.         edittext2=(EditText)findViewById(R.id.editText2);  
  26.         buttonSum=(Button)findViewById(R.id.button1);  
  27.           
  28.         buttonSum.setOnClickListener(new OnClickListener(){  
  29.   
  30.             @Override  
  31.             public void onClick(View view) {  
  32.                 String value1=edittext1.getText().toString();  
  33.                 String value2=edittext2.getText().toString();  
  34.                 int a=Integer.parseInt(value1);  
  35.                 int b=Integer.parseInt(value2);  
  36.                 int sum=a+b;  
  37.     Toast.makeText(getApplicationContext(),String.valueOf(sum),Toast.LENGTH_LONG).show();  
  38.             }  
  39.               
  40.         });  
  41.           
  42.     }  
  43.     @Override  
  44.     public boolean onCreateOptionsMenu(Menu menu) {  
  45.         // Inflate the menu; this adds items to the action bar if it is present.  
  46.         getMenuInflater().inflate(R.menu.activity_main, menu);  
  47.         return true;  
  48.     }  
  49.   
  50. }  







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