Android 的 READ_EXTERNAL_STORAGE 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“你好世界”音乐播放器应用程序。

我遵循了一些教程，他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());
    }
}

我已经尝试过：

要将其放在清单文件中的不同位置：

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

在读取外部存储权限处添加 android:maxSdkVersion:

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

将其放入清单/应用程序/活动标签中：

android:exported=“true”

在javamethod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，但它只提供“操作系统声音”，例如快门声音、低电量声音、按钮单击声音等：

uri = MediaStore.Audio.Media.INTERNAL_CONTENT_URI;

请帮忙，我知道这不应该是一个难题，但我感觉自己像个初学者！

我已阅读并尝试过（或认为它们不适用于我的问题）：

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

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）。其次是使用新奇的请求许可模型：

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;
}

此处找到的片段：https://developer.android.com/training/permissions/requesting.html

解决方案 2：如果不起作用，请尝试以下操作：

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 2

您必须在运行时请求许可：

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;
}

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 3

Step1：在android的manifest.xml中添加权限

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

Step2：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 4

从 Android 13 开始，您将需要使用

READ_MEDIA_IMAGES

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

因此，您需要以编程方式为低于 33 的 API 级别请求

READ_EXTERNAL_STORAGE

权限，并为等于或高于 33 的 API 级别请求

READ_MEDIA_IMAGES

权限，这里是使用新 api 的示例。

binding.btnchangeProfilePicture.setOnClickListener {
                val readImagePermission =
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU)
                        Manifest.permission.READ_MEDIA_IMAGES else Manifest.permission.READ_EXTERNAL_STORAGE
                requestPermission.launch(readImagePermission)
            }
    
private val requestPermission = registerForActivityResult(ActivityResultContracts.RequestPermission()) { isGranted ->
                    if (isGranted) {
                       
                    } else {
                        
                    }
                }

Answer 5

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
    }
}

请求运行时权限

的官方文档

Answer 6

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

<application 
android:requestLegacyExternalStorage="true"
/>

注意：这仅适用于Android 10，请参阅此处

了解更多信息

Answer 7

您的问题解决了吗？你的目标SDK是什么？尝试将

android;maxSDKVersion="21"

添加到

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

Answer 8

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

尝试换线

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);

公共静态最终字符串 MEDIA_CONTENT_CONTROL

由于媒体消费的隐私，不适合第三方应用程序使用

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"/>

然后重试？

Answer 9

请检查下面的代码，使用它您可以找到 SD 卡中的所有音乐文件：

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 文件中添加了以下行，如下所示：

<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 10

除了所有答案。您还可以使用此注释指定要应用的minsdk

@TargetApi(_apiLevel_)

我使用它是为了接受这个请求，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 11

您需要从 Android 11（API 级别 30）或更高版本开始添加 MANAGE_EXTERNAL_STORAGE 权限并请求所有文件访问权限。并且不要忘记将 requestLegacyExternalStorage 设置为 true。

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

<application
   ...
   android:requestLegacyExternalStorage="true">
</application>

Android 的 READ_EXTERNAL_STORAGE 权限

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Android 的 READ_EXTERNAL_STORAGE 权限

问题描述 投票：0回答：11

11个回答

最新问题

问题描述投票：0回答：11