編輯：關於Android編程
在Android調試過程中經常會出現程序出現的結果不是我們預期的結果，那就需要加Log打印調試，看調用過程是否正確，此時就需要打印程序的調用棧，特別是Android代碼相當龐大，打印堆棧更有利於我們分析問題，下面就記錄下平時用到不退出程序打印堆棧的方法。
驗證的方法相關簡單，在Activity的類中創建一個方法ThrowException，在onCreate中調用此方法，看打印出什麼
public void ThrowException() {
// 調試打印堆棧而不退出
Log.d(TAG, Log.getStackTraceString(new Throwable()));
// 創建異常打印堆棧
Exception e = new Exception("this is a log");
e.printStackTrace();
// 獲取當前線程的堆棧
for (StackTraceElement i : Thread.currentThread().getStackTrace()) {
Log.i(TAG, i.toString());
}
RuntimeException re = new RuntimeException();
re.fillInStackTrace();
Log.i(TAG, "stackTrace", re);
// 主動拋出異常調試
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、
// 獲取當前線程的堆棧
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、
// 主動拋出異常調試
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雖然以上方法不盡一樣，但打印出來的堆棧是一樣的。
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