android - Toast 类型中的方法 makeText(Context, CharSequence, int) 不适用于参数（Class, 字符串, 整数)

Question

我正在使用 toast insideonPostExecute(Boolean result)方法。这是它的代码

@Override
protected void onPostExecute(Boolean result) {
    //objAdapter = new listAdapter(ReadContactsActivity.this, items);
    //listView.setAdapter(objAdapter);
    dialog.dismiss();
    if(result)
        Toast.makeText(this, "Email was sent successfully.", Toast.LENGTH_LONG).show();
    else
        Toast.makeText(this, "Email was not sent.", Toast.LENGTH_LONG).show();
    }   

}

我收到错误“ makeText(Context, CharSequence, int)Toast 类型中的方法不适用于参数 (Class<ReadContactsActivity>, String, int)”

Answer 1

用于显示 Toast 使用以下代码。

   @Override
protected void onPostExecute(Boolean result) {
    //objAdapter = new listAdapter(ReadContactsActivity.this, items);
    //listView.setAdapter(objAdapter);
    dialog.dismiss();
    if(result)
        Toast.makeText(Yourclassname.this, "Email was sent successfully.", Toast.LENGTH_LONG).show();
    else
        Toast.makeText(Yourclassname.this, "Email was not sent.", Toast.LENGTH_LONG).show();
    }   

}