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Android Build a Simple Android App (2014) Improving Our Code Dynamically Changing the Background Color

Posted by MUZ140831 Blessing Funani
MUZ140831 Blessing Funani
654 Points

how do l change background color to green

change back ground color to green

MealActivity.java 
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);
       RelativeLayout.setbackGroundColor(Color.GREEN);
    }
}

2 Answers

Chase Marchione
Chase Marchione
155,055 Points
Chase Marchione
Chase Marchione
155,055 Points

Hi Blessing,

You'll want to make sure that you're setting the background color of the variable of type RelativeLayout, rather than RelativeLayout itself. Also, Java is a case sensitive language, so the setBackgroundColor method has to be spelled exactly that way when it is called.

       mealLayout.setBackgroundColor(Color.GREEN);

Hope this helps!

cossy
cossy
17,748 Points
cossy
cossy
17,748 Points

public class MealActivity extends Activity {

public TextView foodLabel;
public TextView drinkLabel;

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

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

    // Add here
    foodLabel.setTextColor(Color.BLUE);
   drinkLabel.setTextColor(Color.GRAY);  
}

}