如何在Android Studio中进行调试Logcat

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我是Android Studio和Android编程的新手，并试图遵循如何上课。我在Android Studio Logcat之后遇到了很多麻烦，因为它不像任何IDE使用的那样简单。有人可以解码我的错误是什么意思吗？我需要学习如何使用Logcat，因为我在网上看到的解释过于简单，并没有涵盖太多。如何在Android Studio中进行调试Logcat

究竟是什么：“2359-13990 /”？
如何在导致错误的代码中找到位置？
Logcat的错误输出是什么意思？

由于空间限制，我改变了我的帖子，现在只有错误而不是冗长的。这里是我在Logcat中的错误：

06-21 21:11:46.347 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3105, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:11:46.348 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:11:46.348 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:11:46.349 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded 
06-21 21:11:47.142 29992-29992/? E/cutils-trace: Error opening trace file: Permission denied (13) 
06-21 21:11:47.185 29992-29992/? E/memtrack: Couldn't load memtrack module (No such file or directory) 
06-21 21:11:47.185 29992-29992/? E/android.os.Debug: failed to load memtrack module: -2 
06-21 21:11:47.398 30006-30006/? E/cutils-trace: Error opening trace file: Permission denied (13) 
06-21 21:11:47.440 30006-30006/? E/memtrack: Couldn't load memtrack module (No such file or directory) 
06-21 21:11:47.440 30006-30006/? E/android.os.Debug: failed to load memtrack module: -2 
06-21 21:11:47.770 30029-30029/? E/cutils-trace: Error opening trace file: Permission denied (13) 
06-21 21:11:47.811 30029-30029/? E/memtrack: Couldn't load memtrack module (No such file or directory) 
06-21 21:11:47.812 30029-30029/? E/android.os.Debug: failed to load memtrack module: -2 
06-21 21:11:49.172 30041-30041/? E/cutils-trace: Error opening trace file: Permission denied (13) 
06-21 21:11:49.227 30046-30046/? E/cutils-trace: Error opening trace file: Permission denied (13) 
06-21 21:11:49.229 30041-30041/? E/memtrack: Couldn't load memtrack module (No such file or directory) 
06-21 21:11:49.229 30041-30041/? E/android.os.Debug: failed to load memtrack module: -2 
06-21 21:11:49.279 30046-30046/? E/memtrack: Couldn't load memtrack module (No such file or directory) 
06-21 21:11:49.279 30046-30046/? E/android.os.Debug: failed to load memtrack module: -2 
06-21 21:11:49.331 30063-30070/? E/art: Failed sending reply to debugger: Broken pipe 
06-21 21:11:52.997 30063-30063/com.example.android.sunshine E/AndroidRuntime: FATAL EXCEPTION: main 
                       Process: com.example.android.sunshine, PID: 30063 
                       java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.sunshine/com.example.android.sunshine.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference 
                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665) 
                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
                        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
                        at android.os.Handler.dispatchMessage(Handler.java:102) 
                        at android.os.Looper.loop(Looper.java:154) 
                        at android.app.ActivityThread.main(ActivityThread.java:6119) 
                        at java.lang.reflect.Method.invoke(Native Method) 
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
                       Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ProgressBar.setVisibility(int)' on a null object reference 
                        at com.example.android.sunshine.MainActivity$FetchWeatherTask.onPreExecute(MainActivity.java:97) 
                        at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:620) 
                        at android.os.AsyncTask.execute(AsyncTask.java:567) 
                        at com.example.android.sunshine.MainActivity.loadWeatherData(MainActivity.java:74) 
                        at com.example.android.sunshine.MainActivity.onCreate(MainActivity.java:63) 
                        at android.app.Activity.performCreate(Activity.java:6679) 
                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618) 
                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)  
                        at android.app.ActivityThread.-wrap12(ActivityThread.java)  
                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)  
                        at android.os.Handler.dispatchMessage(Handler.java:102)  
                        at android.os.Looper.loop(Looper.java:154)  
                        at android.app.ActivityThread.main(ActivityThread.java:6119)  
                        at java.lang.reflect.Method.invoke(Native Method)  
                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)  
                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)  
06-21 21:11:53.668 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3113, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:11:53.669 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:11:53.669 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:11:53.669 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded 
06-21 21:11:58.689 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3121, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:11:58.689 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:11:58.689 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:11:58.690 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded 
06-21 21:12:03.709 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3129, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:12:03.711 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:12:03.712 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:12:03.712 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded 
06-21 21:12:08.742 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3137, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:12:08.742 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:12:08.742 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:12:08.742 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded 
06-21 21:12:13.764 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3145, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:12:13.764 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:12:13.765 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:12:13.765 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded 
06-21 21:12:18.790 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3153, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:12:18.790 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:12:18.790 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:12:18.791 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded 
06-21 21:12:23.808 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord: Could not get audio input for session 3161, record source 1999, sample rate 16000, format 0x1, channel mask 0x10, flags 0 
06-21 21:12:23.808 2359-13990/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -22. 
06-21 21:12:23.808 2359-13990/com.google.android.googlequicksearchbox:search E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object. 
06-21 21:12:23.808 2359-13990/com.google.android.googlequicksearchbox:search E/ActivityThread: Failed to find provider info for com.google.android.apps.gsa.testing.ui.audio.recorded

来源

2017-06-22 J. Doe

这些看起来不像你的应用程序的错误。在“Android监视器”中选择您的应用。您可以在当前的第二个下拉列表中选择它。然后附上这些日志。 –

我是新来张贴，但不阅读本网站。我如何在本网站上附上日志？ –

您查找您的软件包名称（如果您没有在下拉菜单中选择您的项目进行日志记录）。在你的情况下，我想它的“com.example.android.sunshine”。

就在你的包名称后面，你会发现异常和更多细节。

ComponentInfo{com.example.android.sunshine/com.example.android.sunshine.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void'

下面你可以找到stacktrace。在那个stacktrace再次找到你的包名称，你会发现错误发生的确切线。

com.example.android.sunshine.MainActivity$FetchWeatherTask.onPreExecute(MainActivity.java:97)

来源

2017-06-22 05:12:02

如何在Android Studio中进行调试Logcat

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