Android：Toast类型的方法makeText（Context，CharSequence，int）不适用于参数（ListViewAdapter，String，int）

Question

我在过滤器类中使用吐司。 这是它的代码

    public void filter(String charText) {
        charText = charText.toLowerCase(Locale.getDefault());
        expressionlist.clear();
        if (charText.length() == 0) {
            expressionlist.addAll(arraylist);
        } else {
            for (Expression wp : arraylist) {
                if (wp.getWord().toLowerCase(Locale.getDefault())
                        .contains(charText)) {
                    expressionlist.add(wp);
                }
            }
            if(expressionlist.size() == 0){
                Toast toast = Toast.makeText(this, "No match found", Toast.LENGTH_LONG);
                toast.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);
                toast.show();
                   // add all items of expressionlist
                expressionlist.addAll(arraylist);
                }

        }

        notifyDataSetChanged();
    }
}

我收到错误makeText(Context, CharSequence, int) Toast类型的方法makeText(Context, CharSequence, int)不适用于参数(ListViewAdapter, String, int)如何解决此问题？

Answer 1

您应该引用上下文，即getApplicationContext()或传递ListViewAdapter的上下文。

上下文可以是Activity或Fragment

Toast toast = Toast.makeText(context, "No match found", Toast.LENGTH_LONG);