android - 如何读取 logcat 错误文件。我如何阅读并说出下面的 logcat 是什么意思？

Question

08-02 20:48:36.703: D/EditText(3575): nouy
08-02 20:48:36.793: I/Choreographer(3575): Skipped 68 frames!  The application may be doing too much work on its main thread.
08-02 20:48:37.143: D/dalvikvm(3575): GC_CONCURRENT freed 1331K, 34% free 2956K/4428K, paused 4ms+59ms, total 137ms
08-02 20:48:37.353: D/AndroidRuntime(3575): Shutting down VM
08-02 20:48:37.394: W/dalvikvm(3575): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
08-02 20:48:37.443: E/AndroidRuntime(3575): FATAL EXCEPTION: main
08-02 20:48:37.443: E/AndroidRuntime(3575): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.note/com.example.note.NoteEdit}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.os.Looper.loop(Looper.java:137)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.ActivityThread.main(ActivityThread.java:5041)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at java.lang.reflect.Method.invokeNative(Native Method)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at java.lang.reflect.Method.invoke(Method.java:511)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at dalvik.system.NativeStart.main(Native Method)
08-02 20:48:37.443: E/AndroidRuntime(3575): Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.database.AbstractCursor.checkPosition(AbstractCursor.java:424)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at com.example.note.NoteEdit.populateFields(NoteEdit.java:231)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at com.example.note.NoteEdit.onCreate(NoteEdit.java:99)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.Activity.performCreate(Activity.java:5104)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)

Answer 1

Logcat 中的输出应从顶部读取（在您的情况下，FATAL EXCEPTION: main向前）。但是，您需要找出您的活动是如何导致错误的。在大多数情况下（绝对不是全部），您会发现 Logcat 会通知您有关应用程序范围内的一行代码。这是异常起源的地方：

08-02 20:48:37.443: E/AndroidRuntime(3575): Caused by: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.database.AbstractCursor.checkPosition(AbstractCursor.java:424)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
08-02 20:48:37.443: E/AndroidRuntime(3575):     at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
-------->>>>>>>>>     08-02 20:48:37.443: E/AndroidRuntime(3575):     at com.example.note.NoteEdit.populateFields(NoteEdit.java:231)

在此之后，错误在到达之前传播到顶部：

08-02 20:48:37.443: E/AndroidRuntime(3575): FATAL EXCEPTION: main
08-02 20:48:37.443: E/AndroidRuntime(3575): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.note/com.example.note.NoteEdit}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0

另一件需要注意的事情：异常并不总是独立发生。您可以堆叠多个例外。在这种情况下，找到最先抛出的异常（Logcat 输出中的最低值）并按自己的方式工作到顶部。