小编Sim*_*ung的帖子

嗨,我正在制作一个可以从链接下载视频的应用程序.
但我得到了NullPointerException (在kr.co.lenonstudio.kakaovideo.webviewActivity.onCreate(webviewActivity.java:43)

webviewactivity.java:43是link = intent.getExtras().getString("link");
我突出了那些有问题的人.

谢谢.

webviewactivity.java

package kr.co.lenonstudio.kakaovideo;

import java.util.ArrayList;

import kr.co.lenonstudio.kakaovideo.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.Toast;

import com.gc.materialdesign.views.ButtonRectangle;

public class webviewActivity extends Activity{


    WebView webview;
    int listcount=0;
    String link;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_webview);


        //getExtra
        Intent intent=this.getIntent();
**link=intent.getExtras().getString("link");**


 ///
        webview=(WebView)this.findViewById(R.id.webView);
        webview.setWebViewClient(new …