Android Activity runonUiThread

Android Activity runonUiThread

利用Activity.runOnUiThread(Runnable)把更新ui的代码创建在Runnable中，然后在需要更新ui时，把这个Runnable对象传给Activity.runOnUiThread(Runnable)。

new Thread(new Runnable() {         @Override        public void run() {             //延迟两秒             try {                 Thread.sleep( 2000 );             } catch (InterruptedException e) {                 e.printStackTrace();             }             runOnUiThread(new Runnable() {                 @Override                public void run() {                     Toast.makeText(MainActivity.this, "hah", Toast.LENGTH_SHORT).show();                 }             });         }     }).start();