听说大牛封装的Toast，很好用，留下来吧

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/cadi2011/article/details/83014240

public class ToastUtils {

    private static Toast mToast;

    @SuppressLint("ShowToast")
    public static void showShortToast(String str) {
        if (mToast == null) {
            mToast = Toast.makeText(CrushApplication.instance, str, Toast.LENGTH_SHORT);
        }
        mToast.setText(str);
        mToast.show();
    }

    public static void showShortToast(Activity activity, final String str){
        if (activity == null || TextUtils.isEmpty(str)){
            return;
        }
        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                showShortToast(str);
            }
        });
    }
}