Nishant Sambyal Nishant Sambyal - 1 month ago 12
Android Question

what to use if i have long updating ui thread in android

I have a project which a activity have more than 1000 buttons. i am updating the background color of these buttons after taking the color information from the database. This whole process is a very big process and took 8 seconds to load my activity.
i have implement Asynctask for that but the problem is with this exception because "Only the original thread that created a view hierarchy can touch its views". because my long operation is on that part where i am updating my UI elements

After that i have implemented a thread that runs on UIthread for updating ui elements, this works fine according to its function, this thread update my ui but it stucks my application for 5-6 seconds. and then i thought of implementing a progress dialog for that 5-6 seconds. but if i implement progress dialog on runOnUiThread(new Runnable(){} it doesn't work. because updating ui and progress dialog runs on the same time. so progress dialog flashes for few milliseconds. and the activity still remains the same as it was before.
I don't know that to use for updating ui if they took long time to update.

This is my code where i update by ui elements from database.





for (int i = 0; i < list.size(); i++) {

Button btn = list.get(i);
Platform p = db.setplatformncolor(btn.getTag().toString());
String color = p.getColor();


if (color.equals("red")) {
btn.setBackgroundColor(Color.RED);
}


if (color.equals("green")) {

btn.setBackgroundColor(Color.rgb(0, 176, 80));

}


Any help is appreciated.
Thanks.!!

Answer

the for loop take two long time, try to just put the loop in thread and setBackgroundColor in ui thread.

new Thread(new Runnable() {
    @Override
    public void run() {
        for (int i = 0; i < list.size(); i++) {

            final Button btn = list.get(i);
            Platform p = db.setplatformncolor(btn.getTag().toString());
            String color = p.getColor();


            if (color.equals("red")) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        btn.setBackgroundColor(Color.RED);
                    }
                });
            }


            if (color.equals("green")) {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        btn.setBackgroundColor(Color.rgb(0, 176, 80));
                    }
                });

            }
        }
    }
}).start();
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