READ_EXTERNAL_STORAGE Android 权限

Question

我正在尝试访问用户设备上的媒体文件（音乐）来播放它们；一个简单的 "hello world"- 音乐播放器应用程序。

我已经学习了一些教程，它们基本上给出了相同的代码。但这是行不通的；它不断崩溃并告诉我：

error.....
Caused by: java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaProvider uri content://media/external/audio/media from pid=27696, uid=10059 requires android.permission.READ_EXTERNAL_STORAGE, or grantUriPermission()
....

现在，这是我的清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="slimsimapps.troff" >

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


<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>
</manifest>

这是我的Java-方法：

public void initialize() {
    ContentResolver contentResolver = getContentResolver();
    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Cursor cursor = contentResolver.query(uri, null, null, null, null);
    if (cursor == null) {
        // query failed, handle error.
    } else if (!cursor.moveToFirst()) {
        // no media on the device
    } else {
        do {
            addSongToXML(cursor);
        } while (cursor.moveToNext());
    }
}

我试过了：

将其放在清单文件中的不同位置：

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

要在读取外部存储权限时添加android:maxSdkVersion：

<uses-permission
    android:name="android.permission.READ_EXTERNAL_STORAGE"
    android:maxSdkVersion="21" />

将其放入清单/应用程序/activity-tag:

android:exported=“true”

在 java 方法中将 grantUriPremission 放在 uri 和 cursro 之间：

grantUriPermission(null, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);

使用这个，不会崩溃，但是光标会变成空：

uri = MediaStore.Audio.Media.getContentUri("EXTERNAL_CONTENT_URI”);

要使用内部内容 uri，这会按预期工作，但它只会提供 "OS-sounds"，例如快门声、低电量声音、按钮点击等：

uri = MediaStore.Audio.Media.INTERNAL_CONTENT_URI;

请帮忙，我知道这应该不是一个难题，但我觉得自己是个初学者！

我已阅读并尝试过（或认为它们不适用于我的问题）：

Require permission only for older android versions: maxSdkVersion does not work?
Get filename and path from URI from mediastore
Android KitKat securityException when trying to read from MediaStore
Android: java.lang.SecurityException: Permission Denial: start Intent

堆栈跟踪：

09-08 06:59:36.619    2009-2009/slimsimapps.troff D/AndroidRuntime﹕ Shutting down VM
    --------- beginning of crash
09-08 06:59:36.619    2009-2009/slimsimapps.troff E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: slimsimapps.troff, PID: 2009
    java.lang.IllegalStateException: Could not execute method for android:onClick
            at android.view.View$DeclaredOnClickListener.onClick(View.java:4452)
            at android.view.View.performClick(View.java:5198)
            at android.view.View$PerformClick.run(View.java:21147)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            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$MethodAndArgsCaller.run(ZygoteInit.java:726)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
            at android.view.View.performClick(View.java:5198)
            at android.view.View$PerformClick.run(View.java:21147)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:148)
            at android.app.ActivityThread.main(ActivityThread.java:5417)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$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=2009, uid=10059 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 slimsimapps.troff.MainActivity.initialize(MainActivity.java:106)
            at slimsimapps.troff.MainActivity.InitializeExternal(MainActivity.java:80)
            at java.lang.reflect.Method.invoke(Native Method)
            at android.view.View$DeclaredOnClickListener.onClick(View.java:4447)
            at android.view.View.performClick(View.java:5198)
            at android.view.View$PerformClick.run(View.java:21147)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            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)
    --------- beginning of system

Answer 1

http://developer.android.com/reference/android/provider/MediaStore.Audio.AudioColumns.html

尝试更改行 contentResolver.query

//change it to the columns you need
String[] columns = new String[]{MediaStore.Audio.AudioColumns.DATA}; 
Cursor cursor = contentResolver.query(uri, columns, null, null, null);

public static final String MEDIA_CONTENT_CONTROL

Not for use by third-party applications due to privacy of media consumption

http://developer.android.com/reference/android/Manifest.permission.html#MEDIA_CONTENT_CONTROL

尝试先删除 <uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL"/> 然后再试一次？

Answer 2

请检查下面的代码，使用它您可以从 sdcard 中找到所有音乐文件：

public class MainActivity extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_animations);
    getAllSongsFromSDCARD();

}

public void getAllSongsFromSDCARD() {
    String[] STAR = { "*" };
    Cursor cursor;
    Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";

    cursor = managedQuery(allsongsuri, STAR, selection, null, null);

    if (cursor != null) {
        if (cursor.moveToFirst()) {
            do {
                String song_name = cursor
                        .getString(cursor
                                .getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
                int song_id = cursor.getInt(cursor
                        .getColumnIndex(MediaStore.Audio.Media._ID));

                String fullpath = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.DATA));

                String album_name = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ALBUM));
                int album_id = cursor.getInt(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));

                String artist_name = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ARTIST));
                int artist_id = cursor.getInt(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ARTIST_ID));
                System.out.println("sonng name"+fullpath);
            } while (cursor.moveToNext());

        }
        cursor.close();
    }
}


}

我还在 AndroidManifest.xml 文件中添加了如下行：

<uses-sdk
    android:minSdkVersion="16"
    android:targetSdkVersion="17" />

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

Answer 3

您的问题有两种解决方案。快速的方法是将 targetApi 降低到 22（build.gradle 文件）。二是使用新奇的征信模式：

if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
        != PackageManager.PERMISSION_GRANTED) {

    // Should we show an explanation?
    if (shouldShowRequestPermissionRationale(
            Manifest.permission.READ_EXTERNAL_STORAGE)) {
        // Explain to the user why we need to read the contacts
    }

    requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
            MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE);

    // MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
    // app-defined int constant that should be quite unique

    return;
}

在此处找到片段：https://developer.android.com/training/permissions/requesting.html

解决方案 2：如果它不起作用，请尝试此操作：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
    && ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
        REQUEST_PERMISSION);

return;

}

然后在回调中

@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_PERMISSION) {
    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
        // Permission granted.
    } else {
        // User refused to grant permission.
    }
}
}

来自评论。谢谢

Answer 4

你的问题解决了吗？您的目标 SDK 是什么？尝试将 android;maxSDKVersion="21" 添加到 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

Answer 5

您必须在运行时间请求许可：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
        && ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
            REQUEST_PERMISSION);
    dialog.dismiss();
    return;
}

并且在下面的回调中，您可以毫无问题地访问存储。

@Override
public void onRequestPermissionsResult(final int requestCode, @NonNull final String[] permissions, @NonNull final int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_PERMISSION) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // Permission granted.
        } else {
            // User refused to grant permission.
        }
    }
}

Answer 6

第 1 步：在 android manifest.xml

上添加权限

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

第二步：onCreate()方法

int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_READ_MEDIA);
    } else {
        readDataExternal();
    }

Step3: 重写 onRequestPermissionsResult 方法获取回调

 @Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_READ_MEDIA:
            if ((grantResults.length > 0) && (grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
                readDataExternal();
            }
            break;

        default:
            break;
    }
}

注意：readDataExternal() 是从外部存储获取数据的方法。

谢谢。

Answer 7

我也有类似的错误日志，这就是我所做的-

在 onCreate 方法中，我们请求一个用于检查权限的对话框

ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},1);

检查结果的方法

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
    case 1: {
        // If request is cancelled, the result arrays are empty.
        if (grantResults.length > 0
                && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // permission granted and now can proceed
         mymethod(); //a sample method called

        } else {

            // permission denied, boo! Disable the
            // functionality that depends on this permission.
            Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
        }
        return;
    }
    // add other cases for more permissions
    }
}

官方文档到Requesting Runtime Permissions

Answer 8

除了所有答案。也可以指定minsdk应用这个注解

@TargetApi(_apiLevel_)

我使用它来接受这个请求，即使我的 minsdk 是 18。它的作用是该方法仅在设备目标为“_apilevel_”及更高版本时运行。这是我的方法：

    @TargetApi(23)
void solicitarPermisos(){

    if (ContextCompat.checkSelfPermission(this,permiso)
            != PackageManager.PERMISSION_GRANTED) {

        // Should we show an explanation?
        if (shouldShowRequestPermissionRationale(
                Manifest.permission.READ_EXTERNAL_STORAGE)) {
            // Explain to the user why we need to read the contacts
        }

        requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                1);

        // MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an
        // app-defined int constant that should be quite unique

        return;
    }

}

Answer 9

2021年我面临这个问题所以我将使用解决这个问题我在应用程序中添加一个标签的清单文件：

<application 
android:requestLegacyExternalStorage="true"
/>

注意：这只适用于 Android 10，查看更多信息 here

READ_EXTERNAL_STORAGE Android 权限

READ_EXTERNAL_STORAGE permission for Android

java

android

audio-player

android-music-player

android-external-storage