Several methods of the Android print stack

In the Android debugging process often appear the results of the program is not our expected results, it is necessary to add log printing debugging, see whether the call process is correct, at this time need to print the program's call stack, especially the Android code is quite large, the printing stack is more conducive to our analysis of the problem, The following is a record of the usual use to not exit the program print stack method.

The validation method is simple, create a method in the Activity class ThrowException, call this method in OnCreate, see what is printed

public void ThrowException () {//debug print stack without exiting log.d (TAG, log.getstacktracestring (New Throwable ()));//Create exception print stack exception e = new Exception ("This is a log"); E.printstacktrace ();//Gets the stack for the current thread for (Stacktraceelement i:thread.currentthread (). Getstacktrace ()) {log.i (TAG, i.ToString ());} RuntimeException re = new runtimeexception (); Re.fillinstacktrace (); LOG.I (Tag, "StackTrace", re);//actively throw exception debug try {log.i (tag, "-------------------------------- NullPointerException-----------1 "); throw new NullPointerException ();} catch (NullPointerException E1) {//Todo:handle exceptionlog.i (TAG, "-------------------------------- NullPointerException "); LOG.E (TAG, Log.getstacktracestring (E1));//E1.printstacktrace ();} LOG.I (TAG, "--------------------------------nullpointerexception-----------End");}

1, LOG.D (TAG, log.getstacktracestring (New Throwable ()));

04-09 14:19:51.764 d/dzt_test (26317): java.lang.throwable04-09 14:19:51.764 d/dzt_test (26317): at Com.dzt.testapp.MainActivity.ThrowException (mainactivity.java:69) 04-09 14:19:51.764 d/dzt_test (26317): at Com.dzt.testapp.MainActivity.onCreate (mainactivity.java:63) 04-09 14:19:51.764 d/dzt_test (26317): at Android.app.Activity.performCreate (activity.java:5343) 04-09 14:19:51.764 d/dzt_test (26317): at Android.app.Instrumentation.callActivityOnCreate (instrumentation.java:1088) 04-09 14:19:51.764 d/dzt_test (26317): At Android.app.ActivityThread.performLaunchActivity (activitythread.java:2331) 04-09 14:19:51.764 d/dzt_test (26317) : At Android.app.ActivityThread.handleLaunchActivity (activitythread.java:2429) 04-09 14:19:51.764 d/dzt_test (26317) : At android.app.activitythread.access$800 (activitythread.java:151) 04-09 14:19:51.764 D/dzt_test (26317): at Android.app.activitythread$h.handlemessage (activitythread.java:1342) 04-09 14:19:51.764 D/dzt_test (26317): at Android.os.Handler.dispatchMessage (HANDLER.Java:110) 04-09 14:19:51.764 d/dzt_test (26317): at Android.os.Looper.loop (looper.java:193) 04-09 14:19:51.764 d/dzt_ Test (26317): at Android.app.ActivityThread.main (activitythread.java:5333) 04-09 14:19:51.764 d/dzt_test (26317): at Java.lang.reflect.Method.invokeNative (Native Method) 04-09 14:19:51.764 d/dzt_test (26317): at Java.lang.reflect.Method.invoke (method.java:515) 04-09 14:19:51.764 d/dzt_test (26317): at Com.android.internal.os.zygoteinit$methodandargscaller.run (zygoteinit.java:830) 04-09 14:19:51.764 D/dzt_test ( 26317): At Com.android.internal.os.ZygoteInit.main (zygoteinit.java:646) 04-09 14:19:51.764 d/dzt_test (26317): at Dalvik.system.NativeStart.main (Native Method)

2.

Exception e = new Exception ("This is a log");
E.printstacktrace ();

04-09 14:19:51.764 W/system.err (26317): Java.lang.Exception:this is a log04-09 14:19:51.765 w/system.err (26317): at com. Dzt.testapp.MainActivity.ThrowException (mainactivity.java:72) 04-09 14:19:51.765 w/system.err (26317): at Com.dzt.testapp.MainActivity.onCreate (mainactivity.java:63) 04-09 14:19:51.765 w/system.err (26317): at Android.app.Activity.performCreate (activity.java:5343) 04-09 14:19:51.765 w/system.err (26317): at Android.app.Instrumentation.callActivityOnCreate (instrumentation.java:1088) 04-09 14:19:51.765 W/system.err (26317 ): At Android.app.ActivityThread.performLaunchActivity (activitythread.java:2331) 04-09 14:19:51.766 W/system.err ( 26317): At Android.app.ActivityThread.handleLaunchActivity (activitythread.java:2429) 04-09 14:19:51.766 w/ System.err (26317): at android.app.activitythread.access$800 (activitythread.java:151) 04-09 14:19:51.766 W/ System.err (26317): at Android.app.activitythread$h.handlemessage (activitythread.java:1342) 04-09 14:19:51.766 W/ System.err (26317): at ANDROID.OS.handler.dispatchmessage (handler.java:110) 04-09 14:19:51.766 w/system.err (26317): at Android.os.Looper.loop ( looper.java:193) 04-09 14:19:51.766 w/system.err (26317): at Android.app.ActivityThread.main (Activitythread.java : 5333) 04-09 14:19:51.766 w/system.err (26317): at Java.lang.reflect.Method.invokeNative (Native Method) 04-09 14:19:51.766 W/system.err (26317): at Java.lang.reflect.Method.invoke (method.java:515) 04-09 14:19:51.766 w/ System.err (26317): at Com.android.internal.os.zygoteinit$methodandargscaller.run (zygoteinit.java:830) 04-09 14:19:51.766 W/system.err (26317): at Com.android.internal.os.ZygoteInit.main (zygoteinit.java:646) 04-09 14:19:51.767 W/system.err (26317): at Dalvik.system.NativeStart.main (Native Method)

3.

Gets the stack for the current thread for (Stacktraceelement i:thread.currentthread (). Getstacktrace ()) {log.i (TAG, i.ToString ());}

04-09 14:19:51.767 i/dzt_test (26317): Dalvik.system.VMStack.getThreadStackTrace (Native Method) 04-09 14:19:51.768 i/ Dzt_test (26317): Java.lang.Thread.getStackTrace (thread.java:579) 04-09 14:19:51.768 i/dzt_test (26317): Com.dzt.testapp.MainActivity.ThrowException (mainactivity.java:76) 04-09 14:19:51.768 i/dzt_test (26317): Com.dzt.testapp.MainActivity.onCreate (mainactivity.java:63) 04-09 14:19:51.768 i/dzt_test (26317): Android.app.Activity.performCreate (activity.java:5343) 04-09 14:19:51.769 i/dzt_test (26317): Android.app.Instrumentation.callActivityOnCreate (instrumentation.java:1088) 04-09 14:19:51.769 i/dzt_test (26317): Android.app.ActivityThread.performLaunchActivity (activitythread.java:2331) 04-09 14:19:51.769 i/dzt_test (26317): Android.app.ActivityThread.handleLaunchActivity (activitythread.java:2429) 04-09 14:19:51.769 i/dzt_test (26317): android.app.activitythread.access$800 (activitythread.java:151) 04-09 14:19:51.770 I/dzt_test (26317): Android.app.activitythread$h.handlemessage (Activitythread.java:1342) 04-09 14:19:51.770 i/dzt_test (26317): Android.os.Handler.dispatchMessage (handler.java:110) 04-09 14:19:51.770 i/dzt_test (26317): Android.os.Looper.loop (looper.java:193) 04-09 14:19:51.770 i/dzt_test (26317): Android.app.ActivityThread.main (activitythread.java:5333) 04-09 14:19:51.771 i/dzt_test (26317): Java.lang.reflect.Method.invokeNative (Native Method) 04-09 14:19:51.771 i/dzt_test (26317): Java.lang.reflect.Method.invoke (method.java:515) 04-09 14:19:51.771 i/dzt_test (26317): Com.android.internal.os.zygoteinit$methodandargscaller.run (zygoteinit.java:830) 04-09 14:19:51.771 I/dzt_test ( 26317): Com.android.internal.os.ZygoteInit.main (zygoteinit.java:646) 04-09 14:19:51.771 i/dzt_test (26317): Dalvik.system.NativeStart.main (Native Method)

4.

RuntimeException re = new runtimeexception (); Re.fillinstacktrace (); LOG.I (TAG, "StackTrace", re);

04-09 14:19:51.773 i/dzt_test (26317): stacktrace04-09 14:19:51.773 i/dzt_test (26317): java.lang.runtimeexception04-09 14:19:51.773 i/dzt_test (26317): at Com.dzt.testapp.MainActivity.ThrowException ( mainactivity.java:81) 04-09 14:19:51.773 i/dzt_test (26317): at Com.dzt.testapp.MainActivity.onCreate ( mainactivity.java:63) 04-09 14:19:51.773 i/dzt_test (26317): at Android.app.Activity.performCreate (Activity.java : 5343) 04-09 14:19:51.773 i/dzt_test (26317): at Android.app.Instrumentation.callActivityOnCreate ( instrumentation.java:1088) 04-09 14:19:51.773 i/dzt_test (26317): at Android.app.ActivityThread.performLaunchActivity (activitythread.java:2331) 04-09 14:19:51.773 i/dzt_test (26317): At Android.app.ActivityThread.handleLaunchActivity (activitythread.java:2429) 04-09 14:19:51.773 i/dzt_test (26317): At android.app.activitythread.access$800 (activitythread.java:151) 04-09 14:19:51.773 I/dzt_test (26317): at Android.app.activitythread$h.handlemessage (activitythread.java:1342) 04-09 14:19:51.773 I/dzt_test (26317): At Android.os.Handler.dispatchMessage (handler.java:110) 04-09 14:19:51.773 i/dzt_test (26317): at Android.os.Looper.loop (looper.java:193) 04-09 14:19:51.773 i/dzt_test (26317): at Android.app.ActivityThread.main ( activitythread.java:5333) 04-09 14:19:51.773 i/dzt_test (26317): at Java.lang.reflect.Method.invokeNative (Native Method) 04-09 14:19:51.773 i/dzt_test (26317): at Java.lang.reflect.Method.invoke (method.java:515) 04-09 14:19:51.773 I /dzt_test (26317): at Com.android.internal.os.zygoteinit$methodandargscaller.run (zygoteinit.java:830) 04-09 14:19:51.773 i/dzt_test (26317): at Com.android.internal.os.ZygoteInit.main (zygoteinit.java:646) 04-09 14:19:51.773 I /dzt_test (26317): at Dalvik.system.NativeStart.main (Native Method)

5.

Aggressive Throw Exception Debug try {log.i (TAG, "--------------------------------nullpointerexception-----------1"); throw new NullPointerException ();} catch (NullPointerException E1) {//Todo:handle exceptionlog.i (TAG, "-------------------------------- NullPointerException "); LOG.E (TAG, Log.getstacktracestring (E1));//E1.printstacktrace ();} LOG.I (TAG, "--------------------------------nullpointerexception-----------End");

04-09 14:19:51.773 i/dzt_test (26317):--------------------------------nullpointerexception-----------104-09 14:19:51.773 i/dzt_test (26317):--------------------------------nullpointerexception04-09 14:19:51.774 e/dzt_test ( 26317): java.lang.nullpointerexception04-09 14:19:51.774 e/dzt_test (26317): at Com.dzt.testapp.MainActivity.ThrowException (mainactivity.java:88) 04-09 14:19:51.774 e/dzt_test (26317): at Com.dzt.testapp.MainActivity.onCreate (mainactivity.java:63) 04-09 14:19:51.774 e/dzt_test (26317): at Android.app.Activity.performCreate (activity.java:5343) 04-09 14:19:51.774 e/dzt_test (26317): at Android.app.Instrumentation.callActivityOnCreate (instrumentation.java:1088) 04-09 14:19:51.774 e/dzt_test (26317): At Android.app.ActivityThread.performLaunchActivity (activitythread.java:2331) 04-09 14:19:51.774 e/dzt_test (26317) : At Android.app.ActivityThread.handleLaunchActivity (activitythread.java:2429) 04-09 14:19:51.774 e/dzt_test (26317) : At android.app.activitythread.access$800 (Activitythread.java:151) 04-09 14:19:51.774 e/dzt_test (26317): at Android.app.activitythread$h.handlemessage (ActivityThread.java : 1342) 04-09 14:19:51.774 e/dzt_test (26317): at Android.os.Handler.dispatchMessage (handler.java:110) 04-09 14:19:51.774 e/dzt_test (26317): at Android.os.Looper.loop (looper.java:193) 04-09 14:19:51.774 e/dzt_test (26317): at Android.app.ActivityThread.main (activitythread.java:5333) 04-09 14:19:51.774 e/dzt_test (26317): at Java.lang.reflect.Method.invokeNative (Native Method) 04-09 14:19:51.774 e/dzt_test (26317): at Java.lang.reflect.Method.invoke (method.java:515) 04-09 14:19:51.774 e/dzt_test (26317): at Com.android.internal.os.zygoteinit$methodandargscaller.run (zygoteinit.java:830) 04-09 14:19:51.774 E/dzt_test ( 26317): At Com.android.internal.os.ZygoteInit.main (zygoteinit.java:646) 04-09 14:19:51.774 e/dzt_test (26317): at Dalvik.system.NativeStart.main (Native Method) 04-09 14:19:51.775 i/dzt_test (26317):------------------------------- -nullpointerexception-----------End

Although the above method is different, the printed stack is the same.

Several methods of the Android print stack