How to Add Color Events in Android

Procedure

• Start Eclipse IDE.
• Create a new project.
• Create a MainActivity.java file.
• Create an XML file in which there are two TableRows having two buttons each.

The following is an example:

<TableRow android:layout_width="fill_parent"

    android:layout_height="wrap_content">            
    <Button android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/b1"

        android:text="Background"/>

    <Button  android:layout_width="wrap_content"

        android:layout_height="wrap_content"
        android:id="@+id/b2"

        android:text="Yellow"/>
</TableRow>  

In the onClick function add logic for each button using setBackgroundColor.

The code is as follows.

MainActivity.java

package com.example.colorsevent;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
   Button b1,b2,b3,b4;
   TableLayout tt;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      b1=(Button)findViewById(R.id.b1);
      b2=(Button)findViewById(R.id.b2);
      b3=(Button)findViewById(R.id.b3);
      b4=(Button)findViewById(R.id.b4);
      tt=(TableLayout)findViewById(R.id.tt);
      b1.setOnClickListener(this);
      b2.setOnClickListener(this);
      b3.setOnClickListener(this);
      b4.setOnClickListener(this);
   }

   public void onClick(View v) {
      // TODO Auto-generated method stub
      switch (v.getId()) {
      case R.id.b1:
         //tt.setBackgroundColor(Color.RED);
         tt.setBackgroundDrawable(getResources().getDrawable(R.drawable.ts));
      break;
      case R.id.b2:
         tt.setBackgroundColor(Color.YELLOW);
      break;
      case R.id.b3:
         tt.setBackgroundColor(Color.BLUE);
         Toast.makeText(getApplicationContext(), "Hello Sangeet, Good Morning", 100).show();
      break;
      case R.id.b4:
         tt.setBackgroundColor(Color.GREEN);
         Toast.makeText(getApplicationContext(), "Hello Abhijeet, Good Morning", 100).show();
      break;
      default:
      break;
      }
   }
}

activity_main.xml

 

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:id="@+id/tt"    

    android:layout_height="match_parent">

    <View android:layout_width="fill_parent"

         android:layout_height="10px"

         android:background="#ff0000"/>

    <TableRow android:layout_width="fill_parent"

       android:layout_height="wrap_content">    

       <Button android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:id="@+id/b1"

           android:text="Background"/>

       <Button  android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:id="@+id/b2"

           android:text="Yellow"/>

    </TableRow>

    <View android:layout_width="fill_parent"

         android:layout_height="10px"

         android:background="#ff0000"/>

    <TableRow android:layout_width="fill_parent"

       android:layout_height="wrap_content">

       <Button android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:id="@+id/b3"

           android:text="Blue"/>

        <Button android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:id="@+id/b4"

           android:text="Green"/>       

   </TableRow>

   <View android:layout_width="fill_parent"

         android:layout_height="10px"

         android:background="#ff0000"/>

</TableLayout>

Output

By clicking on the Blue button:
 

By clicking on the Green button:

By clicking on the Background button:

By clicking on the Yellow button: