“所需的权限被拒绝！”请求 WRITE_EXTERNAL_STORAGE 时

Question

我正在尝试在 Android 10 上请求 WRITE_EXTERNAL_STORAGE 权限。我使用以下代码执行此操作：

ArrayList<String> permissions = new ArrayList<>();
if (this.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    permissions.add(Manifest.permission.ACCESS_FINE_LOCATION);
}
if (this.checkSelfPermission(ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    permissions.add(Manifest.permission.ACCESS_COARSE_LOCATION);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q &&
        this.checkSelfPermission(ACCESS_BACKGROUND_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    permissions.add(Manifest.permission.ACCESS_BACKGROUND_LOCATION);
}
if (this.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    permissions.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
}
if (permissions.size() > 0) requestPermissions(permissions.toArray(new String[0]), PERMISSION_REQUEST_FINE_LOCATION);

这是清单

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

除 WRITE_EXTERNAL_STORAGE 之外的所有其他权限均有效。当我尝试请求它时，它不会显示任何确认权限的对话框，但它只是拒绝它。为什么以及如何解决？

Answer 1

我已经找到了解决方案，但是问题的原因对我来说仍然是个谜。如果有人有解释，将不胜感激。基本上我的问题是这个issue 的副本。我所要做的就是将以下行从

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

到

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" tools:node="replace"/>

tools:node="replace" 有什么作用？

Answer 2

您可以使用此方法处理请求的权限（适用于 android 10）Here is the documentation.

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            switch (requestCode) {
                case PERMISSION_REQUEST_ID_STORAGE:
                    // permisstion granted by user
                    break;
            }
        } else {
            switch (requestCode) {
                case PERMISSION_REQUEST_ID_STORAGE:
                    // permission denied by user
                    break;
            }
        }
    }

Answer 3

您可以使用 nabinbhandari 的 Android 运行时权限库 在你的 build.gradle app module 文件中写下这个

 //Android Runtime Permission Library
        implementation 'com.nabinbhandari.android:permissions:3.8'

在您的清单文件中写入

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

并在 Activity 中声明这些变量

    String[] permissions = new String[]{READ_EXTERNAL_STORAGE, WRITE_EXTERNAL_STORAGE};
    String rationale = "Please provide storage permission to proceed ...";

并且在你的 onCreate() 方法中写这个

Permissions.Options options = new Permissions.Options()
                .setRationaleDialogTitle("Info")
                .setSettingsDialogTitle("Warning");

        Permissions.check(MainActivity.this, permissions, rationale, options, new PermissionHandler() {
            @Override
            public void onGranted() {
                // do your task.
                Toast.makeText(MainActivity.this, "Permissions granted", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onDenied(Context context, ArrayList<String> deniedPermissions) {
                // permission denied
                Toast.makeText(MainActivity.this, "Permissions denied", Toast.LENGTH_SHORT).show();

            }
        });