How do I set the background of an xml on click in Android

Question

Here is what I want to do: I click on a button which opens and activity that changes the background periodically.

My code looks like this:

 RelativeLayout relativeLayout;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.picscreen);

Thread background = new Thread(){
    public void run(){
        try {
            sleep(2000);

            relativeLayout = new RelativeLayout(this);

            relativeLayout.setBackgroundResource(R.drawable.img10); 
            setContentView(relativeLayout);

        }catch (Exception e){

        }
    }
};
    background.start();
}protected void onDestroy(){
super.onDestroy();

}

The error says the relative Layout cannot ba applied to a thread. What do I do wrong?

Answer 1

The error says the relative Layout cannot ba applied to a thread

Because run method context is used for creating RelativeLayout layout object and calling setContentView

You should use YourActivityName.this instead of this for calling setContentView method and creating RelativeLayout layout object.

Suggestion:

When Application run with current code application will crash with following message:

Only the original thread that created a view hierarchy can touch its views.

So use runOnUiThread or Handler (instead of Thread) for doing some task after specific time