Android Intent putExtra，NullPointerException

我正在尝试创建一个RSS应用程序，在这里我有一个带有WebView的活动，相关的文章应该被打开。我使用的是可能不起作用的。。。有人有解决方案的建议吗

谢谢大家!

ShowNews.java

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class ShowNews extends Activity{
    public void onCreate(Bundle bundle)
    {
        super.onCreate(bundle);
        setContentView(R.layout.show_news);

        String oneNews = null;
        String nTitle = null;
        String nDesc = null;
        String nDate = null;
        String nLink = null;


        Intent i = getIntent();

        if(i != null)
        {
            Bundle b = i.getBundleExtra("BUNDLE.VISA.SEN.INTENT");
            if(b == null)
            {
                oneNews = "Fel bundle?";
            } else {
                nTitle = b.getString("title");
                nDesc = b.getString("description");
                nDate = b.getString("pubdate");
                nLink = b.getString("link");
            }
        } else {
            oneNews = "Information Not Found.";
        }

        TextView tTitle = (TextView)findViewById(R.id.title);
        TextView tDesc = (TextView)findViewById(R.id.desc);
        TextView tDate = (TextView)findViewById(R.id.pubdate);
        TextView tLink = (TextView)findViewById(R.id.link);

        tTitle.setText(nTitle);
        tDesc.setText(nDesc);
        tDate.setText(nDate);
        tLink.setText(nLink);
        final String iLink = nLink;

        tLink.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(ShowNews.this, Browser.class);
                i.putExtra("link", String.valueOf(iLink));
                startActivity(i);
            }
        });
    }
}

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.content.Intent;


@SuppressLint("SetJavaScriptEnabled")
public class Browser extends Activity {

    private WebView mWebView;
    //String i = getIntent().getStringExtra("link");

    Bundle extras = getIntent().getExtras(); 

    String URLEN = extras.getString("link");
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.web_view);

        mWebView = (WebView)findViewById(R.id.webview);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.loadUrl(URLEN);
        mWebView.setWebViewClient(new WebClient());

    }

    public class WebClient extends WebViewClient{
        @Override
        public boolean shouldOverrideUrlLoading(WebView webview, String url)
        {
            webview.loadUrl(url);
            return true;
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
            mWebView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

Browser.java

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class ShowNews extends Activity{
    public void onCreate(Bundle bundle)
    {
        super.onCreate(bundle);
        setContentView(R.layout.show_news);

        String oneNews = null;
        String nTitle = null;
        String nDesc = null;
        String nDate = null;
        String nLink = null;


        Intent i = getIntent();

        if(i != null)
        {
            Bundle b = i.getBundleExtra("BUNDLE.VISA.SEN.INTENT");
            if(b == null)
            {
                oneNews = "Fel bundle?";
            } else {
                nTitle = b.getString("title");
                nDesc = b.getString("description");
                nDate = b.getString("pubdate");
                nLink = b.getString("link");
            }
        } else {
            oneNews = "Information Not Found.";
        }

        TextView tTitle = (TextView)findViewById(R.id.title);
        TextView tDesc = (TextView)findViewById(R.id.desc);
        TextView tDate = (TextView)findViewById(R.id.pubdate);
        TextView tLink = (TextView)findViewById(R.id.link);

        tTitle.setText(nTitle);
        tDesc.setText(nDesc);
        tDate.setText(nDate);
        tLink.setText(nLink);
        final String iLink = nLink;

        tLink.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(ShowNews.this, Browser.class);
                i.putExtra("link", String.valueOf(iLink));
                startActivity(i);
            }
        });
    }
}

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.content.Intent;


@SuppressLint("SetJavaScriptEnabled")
public class Browser extends Activity {

    private WebView mWebView;
    //String i = getIntent().getStringExtra("link");

    Bundle extras = getIntent().getExtras(); 

    String URLEN = extras.getString("link");
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.web_view);

        mWebView = (WebView)findViewById(R.id.webview);
        mWebView.getSettings().setJavaScriptEnabled(true);
        mWebView.loadUrl(URLEN);
        mWebView.setWebViewClient(new WebClient());

    }

    public class WebClient extends WebViewClient{
        @Override
        public boolean shouldOverrideUrlLoading(WebView webview, String url)
        {
            webview.loadUrl(url);
            return true;
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
            mWebView.goBack();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

错误

    01-12 22:55:53.328: E/AndroidRuntime(12532): FATAL EXCEPTION: main
01-12 22:55:53.328: E/AndroidRuntime(12532): Process: com.example.com.raj.rss, PID: 12532
01-12 22:55:53.328: E/AndroidRuntime(12532): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.com.raj.rss/com.example.com.raj.rss.Browser}: java.lang.NullPointerException
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2124)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2248)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.app.ActivityThread.access$800(ActivityThread.java:138)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1199)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.os.Handler.dispatchMessage(Handler.java:102)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.os.Looper.loop(Looper.java:136)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.app.ActivityThread.main(ActivityThread.java:5050)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at java.lang.reflect.Method.invokeNative(Native Method)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at java.lang.reflect.Method.invoke(Method.java:515)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1264)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1080)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at dalvik.system.NativeStart.main(Native Method)
01-12 22:55:53.328: E/AndroidRuntime(12532): Caused by: java.lang.NullPointerException
01-12 22:55:53.328: E/AndroidRuntime(12532):    at com.example.com.raj.rss.Browser.<init>(Browser.java:20)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at java.lang.Class.newInstanceImpl(Native Method)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at java.lang.Class.newInstance(Class.java:1208)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
01-12 22:55:53.328: E/AndroidRuntime(12532):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2115)
01-12 22:55:53.328: E/AndroidRuntime(12532):    ... 11 more

01-12 22:55:53.328:E/AndroidRuntime（12532）：致命异常：main
01-12 22:55:53.328:E/AndroidRuntime（12532）：进程：com.example.com.raj.rss，PID:12532
01-12 22:55:53.328:E/AndroidRuntime（12532）：java.lang.RuntimeException:无法实例化活动组件信息{com.example.com.raj.rss/com.example.com.raj.rss.Browser}:java.lang.NullPointerException
01-12 22:55:53.328:E/AndroidRuntime（12532）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2124）
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2248）
01-12 22:55:53.328:E/AndroidRuntime（12532）：在android.app.ActivityThread.access$800（ActivityThread.java:138）
01-12 22:55:53.328:E/AndroidRuntime（12532）：在android.app.ActivityThread$H.handleMessage（ActivityThread.java:1199）
01-12 22:55:53.328:E/AndroidRuntime（12532）：在android.os.Handler.dispatchMessage（Handler.java:102）上
01-12 22:55:53.328:E/AndroidRuntime（12532）：在android.os.Looper.loop（Looper.java:136）
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于android.app.ActivityThread.main（ActivityThread.java:5050）
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于java.lang.reflect.Method.Invokenactive（本机方法）
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于java.lang.reflect.Method.invoke（Method.java:515）
01-12 22:55:53.328:E/AndroidRuntime（12532）：在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:1264）
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1080）
01-12 22:55:53.328:E/AndroidRuntime（12532）：在dalvik.system.NativeStart.main（本机方法）
01-12 22:55:53.328:E/AndroidRuntime（12532）：由以下原因引起：java.lang.NullPointerException
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于com.example.com.raj.rss.Browser。（Browser.java:20）
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于java.lang.Class.newInstanceImpl（本机方法）
01-12 22:55:53.328:E/AndroidRuntime（12532）：位于java.lang.Class.newInstance（Class.java:1208）
01-12 22:55:53.328:E/AndroidRuntime（12532）：在android.app.Instrumentation.newActivity（Instrumentation.java:1061）上
01-12 22:55:53.328:E/AndroidRuntime（12532）：在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2115）上
01-12 22:55:53.328:E/AndroidRuntime（12532）：。。。还有11个

不能在类级别上使用意图，必须在

onCreate

中使用意图（以便在使用意图之前运行

onCreate

）

将此移动到onCreate（）中

---

至少在

onCreate（）

非常感谢您之前，您无法访问该意图。感激