CODEWITHSUNDEEP
androidxml
1thms
1thms

Reputation: 147

Change XML shape color while app is running

Is it possible to change rectangle (drawn in xml) color in Java code while app is running?

My rectangle.xml:

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/listview_background_shape">
    <stroke android:width="2dp" android:color="#ffffff" />
    <padding android:left="20dp"
        android:top="20dp"
        android:right="20dp"
        android:bottom="20dp" />

    <solid android:color="#006600" />
</shape>

Drawn in main.xml by:

<View
    android:id="@+id/myRectangleView"
    android:layout_width="wrap_content"
    android:layout_height="100dp"
    android:background="@drawable/rectangle"/>

I've tried this way:

   GradientDrawable sd;
    View viewrectangle;
    viewrectangle = (View) findViewById(R.id.myRectangleView);
    sd = (GradientDrawable) viewrectangle.getBackground();
    sd.setColor(0xffffff00);
    sd.invalidateSelf();

It only works when I put it inside OnCreate method.

I want to change rect color by a button, so I put this code inside button's onClick() method. But when I click button while app is running color doesn't change. Any suggestions?

Upvotes: 0

Views: 2144

Answers (3)

Barak
Barak

Reputation: 16393

You could try a color filter. I've used it before to change the color of buttons (note that they started out as standard gray), if you start with another color it could be a very different outcome. Anyway, an example of how I did it:

Import the PorterDuff graphics stuff:

import android.graphics.PorterDuff;

In the class define the item you want to color filter and set the filter:

Button atdButton = (Button) convertView.findViewById(R.id.attendbutton);

    if (atdState[position].equals("P")) {
        atdButton.getBackground().setColorFilter(0xFF00FF00,  // Set filter to green
                PorterDuff.Mode.MULTIPLY);
    } else if (atdState[position].equals("T")) {
        atdButton.getBackground().setColorFilter(0xFFFFFF00,  // Set filter to yellow
                PorterDuff.Mode.MULTIPLY);
    } else if (atdState[position].equals("E")) {
        atdButton.getBackground().setColorFilter(0xFFFF6600,  // Set filter to orange
                PorterDuff.Mode.MULTIPLY);
    } else if (atdState[position].equals("U")) {
        atdButton.getBackground().setColorFilter(0xFFFF0000,  // Set filter to red
                PorterDuff.Mode.MULTIPLY);
    } else {
        atdButton.getBackground().clearColorFilter();
    }

Upvotes: 0

Christian Skogsberg
Christian Skogsberg

Reputation: 2360

Used this code and it worked, alternatively consider redrawing the viewrectangle using viewrectangle.invalidate(), but it shouldn't be nescarry:

View viewrectangle;

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

    viewrectangle = (View) findViewById(R.id.myRectangleView);

}

public void doClick(View v) {
    GradientDrawable sd = (GradientDrawable) viewrectangle.getBackground();
    sd.setColor(0xffffff00);
    sd.invalidateSelf();
}

In this example the "doClick()" method is set in the main.xml:

<Button android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:text="Button"
        android:onClick="doClick"/>

Upvotes: 2

Vishesh Chandra
Vishesh Chandra

Reputation: 7071

You can put this code in a separate method, and that method you can call from onClick of button..

Upvotes: 0

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