我正在尝试使用Android的MediaStore,但即使在添加(我认为是)正确的权限之后,我仍然会遇到权限问题。
这是最新的SDK,6.0(API 23)和运行6.0的设备。
这是我最小的活动:
package com.example.myapplication;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.webkit.MimeTypeMap;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ContentResolver cr = getContentResolver();
Uri uri = MediaStore.Files.getContentUri("external");
String[] projection = null;
String sortOrder = null;
String selectionMimeType = MediaStore.Files.FileColumns.MIME_TYPE + "=?";
String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension("mp3");
String[] selectionArgsMp3 = new String[]{ mimeType };
Cursor allmp3Files = cr.query(uri, projection, selectionMimeType, selectionArgsMp3, sortOrder);
}
}
和清单:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication" >
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<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"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这是我得到的例外:
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: Process: com.example.myapplication, PID: 579
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.MainActivity}: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/file from pid=579, uid=10119 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.-wrap11(ActivityThread.java)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.os.Looper.loop(Looper.java:148)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5417)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/file from pid=579, uid=10119 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.os.Parcel.readException(Parcel.java:1599)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.content.ContentProviderProxy.query(ContentProviderNative.java:421)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.content.ContentResolver.query(ContentResolver.java:491)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.content.ContentResolver.query(ContentResolver.java:434)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at com.example.myapplication.MainActivity.onCreate(MainActivity.java:33)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:6237)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.-wrap11(ActivityThread.java)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.os.Looper.loop(Looper.java:148)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5417)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
10-06 19:16:50.662 579-579/com.example.myapplication E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
有什么想法吗?非常感谢!