在Android调试过程中经常会出现程序出现的结果不是我们预期的结果,那就需要加Log打印调试,看调用过程是否正确,此时就需要打印程序的调用栈,特别是Android代码相当庞大,打印堆栈更有利于我们分析问题,下面就记录下平时用到不退出程序打印堆栈的方法。
验证的方法相关简单,在Activity的类中创建一个方法ThrowException,在onCreate中调用此方法,看打印出什么
public void ThrowException() { // 调试打印堆栈而不退出 Log.d(TAG, Log.getStackTraceString(new Throwable())); // 创建异常打印堆栈 Exception e = new Exception("this is a log"); e.printStackTrace(); // 获取当前线程的堆栈 for (StackTraceElement i : Thread.currentThread().getStackTrace()) { Log.i(TAG, i.toString()); } RuntimeException re = new RuntimeException(); re.fillInStackTrace(); Log.i(TAG, "stackTrace", re); // 主动抛出异常调试 try { Log.i(TAG, "--------------------------------NullPointerException-----------1"); throw new NullPointerException(); } catch (NullPointerException e1) { // TODO: handle exception Log.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.Throwable 04-09 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 log 04-09 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、
// 获取当前线程的堆栈 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): stackTrace 04-09 14:19:51.773 I/dzt_test(26317): java.lang.RuntimeException 04-09 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、
// 主动抛出异常调试 try { Log.i(TAG, "--------------------------------NullPointerException-----------1"); throw new NullPointerException(); } catch (NullPointerException e1) { // TODO: handle exception Log.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-----------1 04-09 14:19:51.773 I/dzt_test(26317): --------------------------------NullPointerException 04-09 14:19:51.774 E/dzt_test(26317): java.lang.NullPointerException 04-09 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
虽然以上方法不尽一样,但打印出来的堆栈是一样的。
时间: 2024-10-09 19:55:08