android Toast提示异常：java.lang.RuntimeException: Can't create handler inside thread that has not called

android Toast提示异常：java.lang.RuntimeException: Can't create handler inside thread that has not called

仔细检查了代码，不应该异常啊？？  没有 handler相关代码啊？

               原来是在子线程弹Toast了， 切记，Toast只能在UI线程弹出，如果一定要在子线程弹，那么就通过 new Handler(Looper.getMainLooper()) 来弹

[java] view plain copy

1. private void toastTest() {  

2.     new Thread(new Runnable() {  

3.   

4. @Override  

5. public void run() {  

6.     <span style="color:#cc0000;">Handler handler = new Handler(Looper.getMainLooper());</span>  

7.     handler.post(new Runnable() {  

8.           

9.         @Override  

10.         public void run() {  

11.             //放在UI线程弹Toast  

12.             Toast.makeText(MainActivity.this, "toast in work thread", Toast.LENGTH_LONG).show();  

13.         }  

14.     });  

15.     //此处会发生异常  

16.             Toast.makeText(MainActivity.this, "toast in work thread", Toast.LENGTH_LONG).show();  

17. }  

18. ).start();  

19.  }  

20.