如何讀取調試日誌在Eclipse

我運行下面的代碼....如何讀取調試日誌在Eclipse

package com.dc; 

import android.app.Activity; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.util.Log; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 

public class DC extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     try 
     { 
      // this is the code that I am surrounding in the try/catch block 
      super.onCreate(savedInstanceState); 

      //init webview 
      WebView DCWebView = (WebView) findViewById(R.id.webview); 

      //when a link is clicked, use the WebView instead of opening a new browser 
      DCWebView.setWebViewClient(new MyWebViewClient() { 
       public void launchExternalBrowser(String url) { 
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
        startActivity(intent); 
       } 
      }); 

      //enable javascript 
      WebSettings webViewSettings = DCWebView.getSettings(); 
      webViewSettings.setJavaScriptEnabled(true); 
     } 
     catch (Exception e) 
     { 
      // this is the line of code that sends a real error message to the log 
      Log.e("ERROR", "ERROR IN CODE: " + e.toString()); 

      // this is the line that prints out the location in 
      // the code where the error occurred. 
      e.printStackTrace(); 
     } 
    } 
}

此堆棧跟蹤是不是難以置信的幫助。我只是學習java/Android的（我在PHP後臺）

11-20 21:22:43.892: ERROR/ERROR(1032): ERROR IN CODE: java.lang.NullPointerException 
11-20 21:22:43.892: WARN/System.err(1032): java.lang.NullPointerException 
11-20 21:22:43.902: WARN/System.err(1032):  at com.dealclippings.DealClippings.onCreate(DealClippings.java:24) 
11-20 21:22:43.902: WARN/System.err(1032):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-20 21:22:43.912: WARN/System.err(1032):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586) 
11-20 21:22:43.912: WARN/System.err(1032):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638) 
11-20 21:22:43.922: WARN/System.err(1032):  at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
11-20 21:22:43.922: WARN/System.err(1032):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928) 
11-20 21:22:43.932: WARN/System.err(1032):  at android.os.Handler.dispatchMessage(Handler.java:99) 
11-20 21:22:43.932: WARN/System.err(1032):  at android.os.Looper.loop(Looper.java:123) 
11-20 21:22:43.942: WARN/System.err(1032):  at android.app.ActivityThread.main(ActivityThread.java:3647) 
11-20 21:22:43.942: WARN/System.err(1032):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-20 21:22:43.952: WARN/System.err(1032):  at java.lang.reflect.Method.invoke(Method.java:507) 
11-20 21:22:43.952: WARN/System.err(1032):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
11-20 21:22:43.962: WARN/System.err(1032):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
11-20 21:22:43.962: WARN/System.err(1032):  at dalvik.system.NativeStart.main(Native Method)

來源

2011-11-21 Webnet

NullPointerException異常意味着你要使用的值設置爲空。例如，如果DCWebView爲空，並且您嘗試調用「DCWebView.setWebViewClient」，則會得到NullPointerException。堆棧跟蹤只是告訴你在哪裏尋找這個問題。 DealClippings.java的第24行似乎是問題所在。 –

請避免以大寫字母開頭的非靜態最終變量名稱;通常他們會以小寫字母開頭。 –

你必須在文件DealClippings行一個NullPointerException 24

java.lang.NullPointerException at 
    com.dealclippings.DealClippings.onCreate(DealClippings.java:24)

來源

2011-11-21 02:38:36

如何讀取調試日誌在Eclipse

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