我在我的应用程序中使用MediaStore类,遇到以下错误(logcat):
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=5769, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.content.ContentProvider.enforceReadPermissionInner(ContentProvider.java:539)
at android.content.ContentProvider$Transport.enforceReadPermission(ContentProvider.java:452)
at android.content.ContentProvider$Transport.query(ContentProvider.java:205)
at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:112)
at android.os.Binder.execTransact(Binder.java:446)
05-11 17:27:35.982 5769-5769/com.media.wanware.fragmentdemo D/AndroidRuntime: Shutting down VM
05-11 17:27:35.984 5769-5769/com.media.wanware.fragmentdemo E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.media.wanware.fragmentdemo, PID: 5769
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.media.wanware.fragmentdemo/com.media.wanware.fragmentdemo.MainActivity}: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=5769, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=5769, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
at android.os.Parcel.readException(Parcel.java:1546)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:185)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
at android.content.ContentResolver.query(ContentResolver.java:478)
at android.content.ContentResolver.query(ContentResolver.java:422)
at com.media.wanware.fragmentdemo.MainActivity.getAllSongsFromDevice(MainActivity.java:45)
at com.media.wanware.fragmentdemo.MainActivity.onCreate(MainActivity.java:29)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
我看到了这个问题:
在Android中读取外部存储会导致SecurityException
但是我已经在我的清单文件中正确地添加了权限,如下所示:
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.media.wanware.fragmentdemo">
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="19" />
<uses-permission
android:name="android.permission.READ_EXTERNAL_STORAGE"
android:maxSdkVersion="19" />
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"
android:maxSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
此外,进一步阅读后,我还看到了以下问题:Android权限即使已声明也无法使用 不再获取权限的主要原因是您的项目具有23或更高的targetSdkVersion。对于这些权限,不仅您的targetSdkVersion 23+应用程序需要具有元素,而且您还必须在Android 6.0+设备上从用户处请求这些权限,使用诸如checkSelfPermission()和requestPermissions()等方法。
作为临时解决方法,请将目标SDK版本降至23以下。
但我的目标SDK只有小于23。 为什么我仍然会遇到相同的错误?