简单的Toast类

1 写类文件 

package com.example.aaa.util;

import android.content.Context;
import android.widget.Toast;

public class ToastUtil {
    private static Toast mToast;

    public static void showMessage(Context context, String msg) {
        if (mToast == null) {
            mToast = Toast.makeText(context, msg, Toast.LENGTH_LONG);
        } else {
            mToast.show();
        }
    }
}

2.使用

 

ToastUtil.showMessage(getContext(),"toastutil test");