Always post action to the UI Thread for execution - Android java.lang

Android examples for java.lang:Thread

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Description

Always post action to the UI Thread for execution

Demo Code


//package com.java2s;
import android.os.Handler;
import android.os.Looper;

public class Main {
    private static Handler uiHandler;

    /**/*from  www .j  a  v  a  2  s. co m*/
     * Same as calling #postOnUiThread(action,false)
     */
    public static void postOnUiThread(final Runnable action) {
        postOnUiThread(action, false);
    }

    /**
     * Always post action to the UI Thread for execution
     *
     * @param action procedure to run on the UI Thread
     * @param wait   true if we should wait for action to complete before returning to calling process
     */
    public static void postOnUiThread(final Runnable action,
            final boolean wait) {
        if (uiHandler == null) {
            uiHandler = new Handler(Looper.getMainLooper());
        }

        uiHandler.post(new Runnable() {
            @Override
            public void run() {
                synchronized (action) {
                    action.run();
                    if (wait) {
                        action.notify();
                    }
                }
            }
        });

        waitForAction(action, wait);

    }

    protected static void waitForAction(final Runnable action, boolean wait) {
        if (wait) {
            synchronized (action) {
                try {
                    action.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

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