如何打印异常Android的堆栈跟踪

Question

我想打印堆栈跟踪,因为此刻我正在运行.

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

我被告知打印 e.stacktrace();

我该怎么做呢？

Answer 1

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

并检查LogCat的输出.

Answer 2

另一种方法,非常有用:

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

Answer 3

在Android中,您应该使用与Android使用的Logcat日志查看器完美配合的日志方法.

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

使用以throwable作为参数的Log.e方法,确保日志类将采用堆栈跟踪并将其正确记录到Logcat.如果使用e.printStackTrace,这将使用常规的Java日志记录方法,它将无法在Logcat中正确显示,在某些情况下,无法双击logcat中的类名来跳转到提及的类和方法中.堆栈跟踪.

打印Stacktrace除以零将如下所示:

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)

该异常记录为警告,日志标记不是很有用.

将除数除以零的正确记录将如下所示:

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)

使用日志标记和日志消息将异常正确记录为错误.

Answer 4

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