如何打印stacktrace的異常Android

Question

我想打印堆棧跟蹤，因爲此刻我有這個運行。

} catch (IOException e) { 
    throw new Error("Copying Failed"); 
} 

而且我已經被告知打印e.stacktrace();

我該怎麼辦呢？

Answer 1

} catch (IOException e) { 
    Log.e("YOUR_APP_LOG_TAG", "I got an error", e); 
} 

並檢查輸出logcat的。

Answer 2

} catch (IOException e) { 
    e.printStackTrace(); 
} 

Answer 3

這是最有可能你被要求通過e.printStackTrace();打印的堆棧跟蹤...

} catch (IOException e) { 
    e.printStackTrace(); 
    throw new Error("Copying Failed"); 
} 

Answer 4

在Android中，您應該使用與Android使用的Logcat日誌查看器很好地配合使用的日誌方法。

} catch (IOException e) { 
    Log.e("YOUR ERROR TAG HERE", "Copying failed", e); 
} 

使用Log.e方法，它接受Throwable作爲您確保日誌類將採取堆棧跟蹤和正確登錄它logcat的一個參數。如果使用e.printStackTrace，它將使用常規的Java日誌記錄方法，並且它在Logcat中不會正確顯示，並且在某些情況下，將不可能雙擊logcat中的類名稱以跳轉到上面提到的類和方法堆棧跟蹤。

由零鴻溝打印堆棧跟蹤看起來就像這樣：

11-21 20:55:47.360: W/System.err(989): java.lang.ArithmeticException: divide by zero 
11-21 20:55:47.379: W/System.err(989): at test.tabs.TabChooser.onCreate(TabChooser.java:15) 
11-21 20:55:47.390: W/System.err(989): at android.app.Activity.performCreate(Activity.java:4465) 
11-21 20:55:47.410: W/System.err(989): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
11-21 20:55:47.410: W/System.err(989): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 
11-21 20:55:47.420: W/System.err(989): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 
11-21 20:55:47.420: W/System.err(989): at android.app.ActivityThread.access$600(ActivityThread.java:122) 
11-21 20:55:47.420: W/System.err(989): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 
11-21 20:55:47.420: W/System.err(989): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-21 20:55:47.420: W/System.err(989): at android.os.Looper.loop(Looper.java:137) 
11-21 20:55:47.420: W/System.err(989): at android.app.ActivityThread.main(ActivityThread.java:4340) 
11-21 20:55:47.430: W/System.err(989): at java.lang.reflect.Method.invokeNative(Native Method) 
11-21 20:55:47.430: W/System.err(989): at java.lang.reflect.Method.invoke(Method.java:511) 
11-21 20:55:47.430: W/System.err(989): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
11-21 20:55:47.430: W/System.err(989): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
11-21 20:55:47.430: W/System.err(989): at dalvik.system.NativeStart.main(Native Method) 

異常被記錄爲警告和日誌標籤是不是非常有幫助。

零一分的正確記錄看起來就像這樣：

11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): Copying failed 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): java.lang.ArithmeticException: divide by zero 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at test.tabs.TabChooser.onCreate(TabChooser.java:16) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.app.Activity.performCreate(Activity.java:4465) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.app.ActivityThread.access$600(ActivityThread.java:122) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.os.Looper.loop(Looper.java:137) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at android.app.ActivityThread.main(ActivityThread.java:4340) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at java.lang.reflect.Method.invokeNative(Native Method) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at java.lang.reflect.Method.invoke(Method.java:511) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
11-21 21:03:32.480: E/YOUR ERROR TAG HERE(1356): at dalvik.system.NativeStart.main(Native Method) 

唯一的例外是正確登錄與您的日誌標籤錯誤和日誌信息。

Answer 5

的另一種方法，是非常有用的：

try 
{ 
... 
} 
catch (Exception e) 
{ 
    Log.e(APP_TAG, "STACKTRACE"); 
    Log.e(APP_TAG, Log.getStackTraceString(e)); 
}