找不到符号“上下文"，android.content.Context [英] Cannot find symbol 'Context', android.content.Context

问题描述

我有以下代码:

package com.androidtest.notification;

import android.app.Activity;
import android.os.Bundle;
import android.widget;
import android.widget.Toast;
import android.content.Context;

public class activityNotification extends Activity
{

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Context context = getApplicationContext();
        CharSequence text = "Hello toast!";
        int duration = Toast.LENGTH_SHORT;

        Toast toast = Toast.makeText(context, text, duration);
        toast.show();
    }
}

我正在尝试在命令行"$ ant build"上使用ant对其进行编译，但我不断收到以下错误:

I'm trying to compile it using ant on command line '$ ant build', but I keep getting the following error:

error: cannot find symbol
[javac]         Context context = getApplicationContext();
[javac]         ^

有什么建议吗?谢谢！

推荐答案

简短答案:添加此内容

import android.content.Context;

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