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Start your free trialJoseph Bachaalany
4,007 Pointspreventing same color to appear twice in a row
How to prevent the same background color and text to appear twice in a row? I mean when you press on the button sometimes the text or color will stay the same.
3 Answers
Ben Deitch
Treehouse TeacherHey Joseph! You could store which color the background currently is, and then when picking a new background color, use a while loop to keep picking a new color until you get a different one. Hope that helps!
Kresimir Fijacko
6,025 Pointstry this code
public class FunFactsActivity extends AppCompatActivity {
// Declare our view variables
private TextView factTextView;
private Button showFactButton;
private RelativeLayout relativeLayout;
private int currentColor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fun_facts);
// Assign the views from the layout file to the corresponding variables
factTextView = findViewById(R.id.factTextView);
showFactButton = findViewById(R.id.showFactButton);
relativeLayout = findViewById(R.id.relativeLayout);
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View view) {
ColorWheel colorWheel = new ColorWheel();
int newColor;
do {
newColor = colorWheel.GetColor();
} while (newColor == currentColor);
currentColor = newColor;
// Update the screen with our new fact
factTextView.setText(FactBook.GetFact());
relativeLayout.setBackgroundColor(newColor);
showFactButton.setTextColor(newColor);
}
};
showFactButton.setOnClickListener(listener);
}
}
ROBERT RUBY II
10,586 PointsTo do this I created a class called ColorGenerator-- Pasted code below.
package com.example.bobby.funfacts;
import android.graphics.Color;
import java.util.Random;
class ColorGenerator {
// Fields or Member Variables - Properties about the object
int r = 0;
int g = 0;
int b = 0;
int maxNum = 255;
// Methods
int getColor(){
// Create random r,g,b values
Random randomGen = new Random();
r = randomGen.nextInt(maxNum);
g = randomGen.nextInt(maxNum);
b = randomGen.nextInt(maxNum);
// Get a hex value from r,g,b
String hexColor = String.format("#%02x%02x%02x", r, g, b); // see https://stackoverflow.com/questions/3607858/convert-a-rgb-color-value-to-a-hexadecimal
// Get int based color in intColor from hexColor
int intColor = Color.parseColor(hexColor); // see https://stackoverflow.com/questions/6935057/convert-hex-color-value-ffffff-to-integer-value
// Return integer based color for setBackgroundColor
return intColor;
}
}