Android Q (10)请求许可才能访问所有存储空间。作用域存储

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

if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_CODE);
}

ContentResolver contentResolver = getContentResolver();
Uri collection;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
    collection = MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL);
} else {
    collection = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
}

Cursor cursor = contentResolver.query(collection, null, null, null, null);
if (cursor != null) {
    while (cursor.moveToNext()) {
        // 处理图片
    }
    cursor.close();
}

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