UiThreadHandler.java

package com.example.takeorselectpicandencodetostring;

import android.os.Handler;
import android.os.Looper;

public class UiThreadHandler {
    private static Handler uiHandler = new Handler(Looper.getMainLooper());

    public final static Handler getUiHandler() {
        return uiHandler;
    }

    public final static boolean post(Runnable r) {
        if (uiHandler == null) {
            return false;
        }
        return uiHandler.post(r);
    }

    public final static boolean postDelayed(Runnable r, long delayMillis) {
        if (uiHandler == null) {
            return false;
        }
        return uiHandler.postDelayed(r, delayMillis);
    }

    public final static boolean postOnceDelayed(Runnable r, long delayMillis) {
        if (uiHandler == null) {
            return false;
        }
        uiHandler.removeCallbacks(r);
        return uiHandler.postDelayed(r, delayMillis);
    }

    public static void removeCallbacks(Runnable runnable) {
        if (uiHandler == null) {
            return;
        }
        uiHandler.removeCallbacks(runnable);
    }
}