我是Android Studio和Android编程的新手，我正在尝试按照如何上课。我在Android Studio Logcat之后遇到了很多麻烦，因为它对我来说并不像任何IDE那样简单。有人可以解码我的错误中的意思吗？我需要学习如何使用Logcat，因为我在网上看到的解释过于简化，并没有太多内容。
由于空间限制，我更改了帖子，现在只有错误而不是详细信息。以下是我在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
答案 0 :(得分：0)
您要查找您的包名称（如果您没有在下拉列表中选择您的项目进行记录）。在你的情况下，我认为它是＆＃34; com.example.android.sunshine＆＃34;。
在您的软件包名称之后，您将找到异常和更多详细信息。
ComponentInfo{com.example.android.sunshine/com.example.android.sunshine.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void'
在下面你可以找到stacktrace。在堆栈跟踪中再次找到您的包名称，您将找到发生错误的确切行。
com.example.android.sunshine.MainActivity$FetchWeatherTask.onPreExecute(MainActivity.java:97)