Android 实现Toast的快速切换刷新

private static Toast mToast = null;

public static void showToast(String msg) {

       if (mToast == null) {
           mToast = Toast.makeText(mApplication, msg, Toast.LENGTH_SHORT);
       } else {
           mToast.setText(msg);
           mToast.setDuration(Toast.LENGTH_SHORT);
       }

       mToast.show();