Android线程间通信

Android采用UI单线程模型，所以工作线程（非UI线程）与UI线程的通信是不可避免的。工作线程与UI主线程通信（进行更新UI等操作）主要有以下三种方式。

First :

Looper.getMainLooper()

    Runnable task = getTask();

    new Handler(Looper.getMainLooper()).post(task);

Second :

Activity#runOnUiThread()

    Runnable task = getTask();

    runOnUiThread(task);

The implements of runOnUiThread is shown as bellow :

public final void runOnUiThread(Runnable action) {
    if (Thread.currentThread() != mUiThread) {
        mHandler.post(action);
    } else {
        action.run();
    }
}
It will check if the current Thread is already the UI thread and then execute it directly. Posting it as a message will delay the execution until you return from the current UI-thread method.

Third：

There is also a third way to execute a Runnable on the UI thread which would be View#post(Runnable) - this one will always post the message even when called from the UI thread. That is useful since that will ensure that the View has been properly constructed and has a layout before the code is executed.

Android线程间通信,布布扣,bubuko.com

原文：http://blog.csdn.net/handsome3/article/details/22807125