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Android Build a Simple Android App Improving Our Code Dynamically Changing the Background Color

Ramesh Ram
Ramesh Ram
3,340 Points

change the background color to green

change background color

MealActivity.java
import android.os.Bundle;
import android.widget.TextView;

public class MealActivity extends Activity {
  private RelativeLayout RL;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_meal);

        TextView foodLabel = (TextView) findViewById(R.id.foodTextView);
        TextView drinkLabel = (TextView) findViewById(R.id.drinkTextView);
        RelativeLayout mealLayout = (RelativeLayout) findViewById(R.id.mealLayout);
      RL=(RelativeLayout) findViewById(R.id.RL);
      View.OnClickListener Listener=new View.OnClickListener()
      {
        public void OnClick(View v){
        RL.setBackgroundColor(Color.GREEN);
        }
        }

    }
}

1 Answer

Kourosh Raeen
Kourosh Raeen
23,733 Points

There is no need for an OnClickListener. Just call setBackgroundColor() on mealLayout and pass in the color:

import android.os.Bundle;
import android.widget.TextView;

public class MealActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_meal);

        TextView foodLabel = (TextView) findViewById(R.id.foodTextView);
        TextView drinkLabel = (TextView) findViewById(R.id.drinkTextView);
        RelativeLayout mealLayout = (RelativeLayout) findViewById(R.id.mealLayout);
        mealLayout.setBackgroundColor(Color.GREEN);
    }
}