错误:找不到符号变量吐司 [英] ERROR: cannot find symbol variable toast

问题描述

我从一个教程中复制了以下代码，但显示了4个错误，都相同:找不到符号变量toast.我搜索了很多解决方案，但找不到任何解决方案.以下是我的代码的MainActivity.java文件-

I copied the following code from a tutorial but it shows 4 errors, all same : cannot find symbol variable toast. I searched a lot for any solution but was unable to find any. Following is the MainActivity.java file of my code-

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.net.ConnectivityManager;
import android.content.Context;
import android.widget.Button;
import android.view.View;
import android.net.NetworkInfo;


public class MainActivity extends AppCompatActivity {
    private Button checkIntrnetButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        checkIntrnetButton = (Button)findViewById(R.id.checkInternetButton);
        checkIntrnetButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkConnection();
            }
        });
    }
    protected boolean isOnline() {
        ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netInfo = cm.getActiveNetworkInfo();
        if (netInfo != null && netInfo.isConnectedOrConnecting()) {
            return true;
        } else {
            return false;
        }
    }
    public void checkConnection(){
        if(isOnline()){
            Toast.makeText(MainActivity.this, "You are connected to Internet", Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(MainActivity.this, "You are not connected to Internet", Toast.LENGTH_SHORT).show();
        }
    }
}

推荐答案

只需导入 import android.widget.Toast; 即可

Just import import android.widget.Toast; it will work

赞

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.net.ConnectivityManager;
import android.content.Context;
import android.widget.Button;
import android.view.View;
import android.net.NetworkInfo;
import android.widget.Toast;

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