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

private void toastTest() {
new Thread(new Runnable() {

@Override
public void run() {
<span style="color:#cc0000;">Handler handler = new Handler(Looper.getMainLooper());</span>
handler.post(new Runnable() {

@Override
public void run() {
//放在UI线程弹Toast
Toast.makeText(MainActivity.this, "toast in work thread", Toast.LENGTH_LONG).show();
}
});
//此处会发生异常
//				Toast.makeText(MainActivity.this, "toast in work thread", Toast.LENGTH_LONG).show();
}
}).start();
}