应用程序在按下2.9版Genymotion按钮时崩溃，但在2.8版上工作

Question

这是我按下电话上的按钮后的logcat：

我已经在清单中插入了请求权限的命令，但可能需要更多的东西：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.never.mediaalarmplayer">
android:versionCode = "1"
    android:versionName="1.0">
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application

        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        android:fullBackupContent="@xml/backup_descriptor">
        <activity android:name=".Alarm"
            android:launchMode="singleTop"
            android:screenOrientation="portrait"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       <activity android:name=".MediaPlayer"
           android:launchMode="singleTop"
           android:screenOrientation="portrait"
           android:label="@string/app_name"
           />

        <service android:name="com.never.mediaalarmplayer.MusicService" />
        <receiver android:name=".AlarmReceiver"/>
    </application>

</manifest>

Logcat 2.9：

09-02 06:34:47.269 666-677/system_process I/ActivityManager: START u0 {cmp=com.never.mediaalarmplayer/.MediaPlayer} from uid 10060 on display 0
09-02 06:34:47.269 666-723/system_process W/AudioTrack: AUDIO_OUTPUT_FLAG_FAST denied by client; transfer 4, track 48000 Hz, output 44100 Hz
09-02 06:34:47.313 1148-1167/android.process.media E/DatabaseUtils: Writing exception to parcel
                                                                    java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2012, uid=10060 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
                                                                        at android.content.ContentProvider.enforceReadPermissionInner(ContentProvider.java:605)
                                                                        at android.content.ContentProvider$Transport.enforceReadPermission(ContentProvider.java:480)
                                                                        at android.content.ContentProvider$Transport.query(ContentProvider.java:211)
                                                                        at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:112)
                                                                        at android.os.Binder.execTransact(Binder.java:507)
09-02 06:34:47.313 2012-2012/com.never.mediaalarmplayer D/AndroidRuntime: Shutting down VM
09-02 06:34:47.318 2012-2012/com.never.mediaalarmplayer E/AndroidRuntime: FATAL EXCEPTION: main
                                                                          Process: com.never.mediaalarmplayer, PID: 2012
                                                                          java.lang.RuntimeException: Unable to start activity ComponentInfo{com.never.mediaalarmplayer/com.never.mediaalarmplayer.MediaPlayer}: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2012, uid=10060 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
                                                                              at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
                                                                              at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
                                                                              at android.app.ActivityThread.-wrap11(ActivityThread.java)
                                                                              at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
                                                                              at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                              at android.os.Looper.loop(Looper.java:148)
                                                                              at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                              at java.lang.reflect.Method.invoke(Native Method)
                                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                                           Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=2012, uid=10060 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
                                                                              at android.os.Parcel.readException(Parcel.java:1599)
                                                                              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:491)
                                                                              at android.content.ContentResolver.query(ContentResolver.java:434)
                                                                              at com.never.mediaalarmplayer.MediaPlayer.getSongList(MediaPlayer.java:138)
                                                                              at com.never.mediaalarmplayer.MediaPlayer.onCreate(MediaPlayer.java:41)
                                                                              at android.app.Activity.performCreate(Activity.java:6237)
                                                                              at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
                                                                              at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
                                                                              at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
                                                                              at android.app.ActivityThread.-wrap11(ActivityThread.java) 
                                                                              at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
                                                                              at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                              at android.os.Looper.loop(Looper.java:148) 
                                                                              at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                                              at java.lang.reflect.Method.invoke(Native Method) 
                                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Answer 1

READ_EXTERNAL_STORAGE是自Android6.0以来的运行时权限。在清单中添加权限请求是不够的。应用程序应该在运行时请求权限。如果你不想那么做，换到22或更少。

崩溃的原因存在于GenyMotion的实现中。IMHO（我猜），GenyMotion2.8中的MediaProvider不能访问外部存储，但2.9可以。