how to change actionbar color in android programmatically

To change the action bar color in Android programmatically, you can use the setBackgroundDrawable method of the ActionBar class.

Here's an example of how you might do this in an activity:

import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setBackgroundDrawable(new ColorDrawable(0xFF0000FF));
        }
    }
}

In this example, the setBackgroundDrawable method is used to set the background of the action bar to a blue color. The color is specified using a hexadecimal color code (in this case, 0xFF0000FF for blue).

You can use any valid color code to set the action bar color as desired.