Android 致命的异常错误：main

当我尝试运行最近在android Studio模拟器nexus 5 api23上找到的音乐播放器教程中的程序时，我遇到了一个错误。 错误是：

05-28 21:01:23.267 2937-2937/com.tunein.bryantyoung.tunein E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.tunein.bryantyoung.tunein, PID: 2937
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tunein.bryantyoung.tunein/com.tunein.bryantyoung.tunein.MainActivity}: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2937, uid=10066 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2622)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2683)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1440)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:6066)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:770)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:660)
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2937, uid=10066 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.os.Parcel.readException(Parcel.java:1666)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
at android.content.ContentResolver.query(ContentResolver.java:502)
at android.content.ContentResolver.query(ContentResolver.java:444)
at com.tunein.bryantyoung.tunein.MainActivity.getSongList(MainActivity.java:197)
at com.tunein.bryantyoung.tunein.MainActivity.onCreate(MainActivity.java:104)
at android.app.Activity.performCreate(Activity.java:6584)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2575)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2683) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1440) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:6066) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:770) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:660)

不确定运行导致异常的程序时到底发生了什么。main.xml文件是：

<menu xmlns:android="http://schemas.android.com/apk/res/android"


    <item
        android:id="@+id/action_shuffle"
        android:icon="@drawable/rand"
        android:orderInCategory="1"
        android:showAsAction="always"
        android:title="Shuffle"/>
    <item
        android:id="@+id/action_end"
        android:icon="@drawable/end"
        android:orderInCategory="2"
        android:showAsAction="always"
        android:title="End"/>
</menu>

我的main仍然有同样的问题

教程是 谢谢

您的问题在这里：

 Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2937, uid=10066 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission() 

你的应用程序必须请求访问文件的权限，请尝试将其添加到你的应用程序清单：

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

---

更多信息：

我同意goatcheeze此行的主要活动。java:197正在读取受保护的外部存储器，因此请遵循他的建议。添加代码行后，问题仍然存在，可能是模拟器吗？答案如下：