本文介绍了一种在Android应用程序中进行调试的技巧，通过多种方式打印调用堆栈来帮助开发者更好地定位问题所在。这些方法包括使用Log类、创建并打印异常、获取当前线程的堆栈等。
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
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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"
);
}
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1、Log.d(TAG, Log.getStackTraceString(new Throwable()));
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:
51.764
D/dzt_test(
26317
): java.lang.Throwable
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at com.dzt.testapp.MainActivity.ThrowException(MainActivity.java:
69
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at com.dzt.testapp.MainActivity.onCreate(MainActivity.java:
63
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at android.app.Activity.performCreate(Activity.java:
5343
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
1088
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2331
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
2429
)
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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$H.handleMessage(ActivityThread.java:
1342
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at android.os.Handler.dispatchMessage(Handler.java:
110
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at android.os.Looper.loop(Looper.java:
193
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at android.app.ActivityThread.main(ActivityThread.java:
5333
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at java.lang.reflect.Method.invokeNative(Native Method)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at java.lang.reflect.Method.invoke(Method.java:
515
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:
830
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:
646
)
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09
14
:
19
:
51.764
D/dzt_test(
26317
): at dalvik.system.NativeStart.main(Native Method)
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2、
Exception e = new Exception("this is a log");
e.printStackTrace();
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:
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:
51.764
W/System.err(
26317
): java.lang.Exception:
this
is a log
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14
:
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:
51.765
W/System.err(
26317
): at com.dzt.testapp.MainActivity.ThrowException(MainActivity.java:
72
)
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09
14
:
19
:
51.765
W/System.err(
26317
): at com.dzt.testapp.MainActivity.onCreate(MainActivity.java:
63
)
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09
14
:
19
:
51.765
W/System.err(
26317
): at android.app.Activity.performCreate(Activity.java:
5343
)
04
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09
14
:
19
:
51.765
W/System.err(
26317
): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:
1088
)
04
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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$H.handleMessage(ActivityThread.java:
1342
)
04
-
09
14
:
19
:
51.766
W/System.err(
26317
): at android.os.Handler.dispatchMessage(Handler.java:
110
)
04
-
09
14
:
19
:
51.766
W/System.err(
26317
): at android.os.Looper.loop(Looper.java:
193
)
04
-
09
14
:
19
:
51.766
W/System.err(
26317
): at android.app.ActivityThread.main(ActivityThread.java:
5333
)
04
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09
14
:
19
:
51.766
W/System.err(
26317
): at java.lang.reflect.Method.invokeNative(Native Method)
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09
14
:
19
:
51.766
W/System.err(
26317
): at java.lang.reflect.Method.invoke(Method.java:
515
)
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09
14
:
19
:
51.766
W/System.err(
26317
): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:
830
)
04
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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)
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3、
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// 获取当前线程的堆栈
for
(StackTraceElement i : Thread.currentThread().getStackTrace()) {
Log.i(TAG, i.toString());
}
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:
19
:
51.767
I/dzt_test(
26317
): dalvik.system.VMStack.getThreadStackTrace(Native Method)
04
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09
14
:
19
:
51.768
I/dzt_test(
26317
): java.lang.Thread.getStackTrace(Thread.java:
579
)
04
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09
14
:
19
:
51.768
I/dzt_test(
26317
): com.dzt.testapp.MainActivity.ThrowException(MainActivity.java:
76
)
04
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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
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09
14
:
19
:
51.769
I/dzt_test(
26317
): android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
2331
)
04
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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$H.handleMessage(ActivityThread.java:
1342
)
04
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09
14
:
19
:
51.770
I/dzt_test(
26317
): android.os.Handler.dispatchMessage(Handler.java:
110
)
04
-
09
14
:
19
:
51.770
I/dzt_test(
26317
): android.os.Looper.loop(Looper.java:
193
)
04
-
09
14
:
19
:
51.770
I/dzt_test(
26317
): android.app.ActivityThread.main(ActivityThread.java:
5333
)
04
-
09
14
:
19
:
51.771
I/dzt_test(
26317
): java.lang.reflect.Method.invokeNative(Native Method)
04
-
09
14
:
19
:
51.771
I/dzt_test(
26317
): java.lang.reflect.Method.invoke(Method.java:
515
)
04
-
09
14
:
19
:
51.771
I/dzt_test(
26317
): com.android.internal.os.ZygoteInit$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)
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4、
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RuntimeException re =
new
RuntimeException();
re.fillInStackTrace();
Log.i(TAG,
"stackTrace"
, re);
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19
:
51.773
I/dzt_test(
26317
): stackTrace
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19
:
51.773
I/dzt_test(
26317
): java.lang.RuntimeException
04
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09
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:
19
:
51.773
I/dzt_test(
26317
): at com.dzt.testapp.MainActivity.ThrowException(MainActivity.java:
81
)
04
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09
14
:
19
:
51.773
I/dzt_test(
26317
): at com.dzt.testapp.MainActivity.onCreate(MainActivity.java:
63
)
04
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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)
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5、
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// 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"
);
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04
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09
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:
19
:
51.773
I/dzt_test(
26317
): --------------------------------NullPointerException-----------
1
04
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09
14
:
19
:
51.773
I/dzt_test(
26317
): --------------------------------NullPointerException
04
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19
:
51.774
E/dzt_test(
26317
): java.lang.NullPointerException
04
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:
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$H.handleMessage(ActivityThread.java:
1342
)
04
-
09
14
:
19
:
51.774
E/dzt_test(
26317
): at android.os.Handler.dispatchMessage(Handler.java:
110
)
04
-
09
14
:
19
:
51.774
E/dzt_test(
26317
): at android.os.Looper.loop(Looper.java:
193
)
04
-
09
14
:
19
:
51.774
E/dzt_test(
26317
): at android.app.ActivityThread.main(ActivityThread.java:
5333
)
04
-
09
14
:
19
:
51.774
E/dzt_test(
26317
): at java.lang.reflect.Method.invokeNative(Native Method)
04
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09
14
:
19
:
51.774
E/dzt_test(
26317
): at java.lang.reflect.Method.invoke(Method.java:
515
)
04
-
09
14
:
19
:
51.774
E/dzt_test(
26317
): at com.android.internal.os.ZygoteInit$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。
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