Android activity title background color/image change

For changing Title bar background, add the following code in the activite's onCreate() function,

 ActionBar bar = getActionBar();
//for color
 //bar.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#DDAAD")));
//for image
 bar.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_bg3));
bar.setTitle("add your own title here");

For changing the Title bar title's color,

In the onCreate() Function,

this.setTitleColor(getResources().getColor(R.color.black));

Android Button Click Event

There are three ways to do it,

First Method,

In the onCreate function,

Button button = (Button) findViewById(R.id.button1); button.setOnClickListener(new OnClickListener() { public void onClick(View v) { ImageView iv = (ImageView) findViewById(R.id.imageview1); iv.setVisibility(View.VISIBLE); } });

Second Method,

Import the following package,
import android.view.View.OnClickListener;

In onCreate method add the following Listener,

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();

}

Implement the Listener,

public void addListenerOnButton() { button = (Button) findViewById(R.id.button1); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.vijaynetwork.com")); startActivity(browserIntent); } });

Third Method,

<Button
     android:layout_height="wrap_content"
     android:layout_width="wrap_content"
     android:text="@string/self_destruct"

     android:onClick="displayMap" />

when a user clicks the button, the Android system calls the activity's displayMap(View) function.

And the function declaration would be,

public void displayMap(View myview)
{
//made your own code for button click
}