Android R-使用作用域存储(MediaStore.Downloads)在下载文件夹中创建一个文本文件

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

ContentValues contentValues = new ContentValues();
contentValues.put(MediaStore.Downloads.DISPLAY_NAME, "example.txt");
contentValues.put(MediaStore.Downloads.MIME_TYPE, "text/plain");
contentValues.put(MediaStore.Downloads.RELATIVE_PATH, Environment.DIRECTORY_DOWNLOADS);

Uri uri = getContentResolver().insert(MediaStore.Downloads.EXTERNAL_CONTENT_URI, contentValues);
if (uri != null) {
    try {
        OutputStream outputStream = getContentResolver().openOutputStream(uri);
        if (outputStream != null) {
            outputStream.write("Hello, world!".getBytes());
            outputStream.close();
            // 文件创建成功
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Uri downloadsUri = MediaStore.Downloads.EXTERNAL_CONTENT_URI;
Cursor cursor = getContentResolver().query(downloadsUri, null, null, null, null);

if (cursor != null && cursor.moveToFirst()) {
    int displayNameIndex = cursor.getColumnIndex(MediaStore.Downloads.DISPLAY_NAME);
    int mimeTypeIndex = cursor.getColumnIndex(MediaStore.Downloads.MIME_TYPE);

    do {
        String displayName = cursor.getString(displayNameIndex);
        String mimeType = cursor.getString(mimeTypeIndex);

        // 处理文件
    } while (cursor.moveToNext());

    cursor.close();
}