您需要在自己的应用程序中实现ContentProvider。如下所示，Content Provider管理应用程序内部和外部之间共享数据的访问：

首先，创建一个类来实现Content Provider：

public class MyContentProvider extends ContentProvider {
    public static final Uri CONTENT_URI = Uri.parse("content://com.example.myapp.provider/data");
    private static final int DATA_LIST = 1;
    private static final int DATA_ITEM = 2;
    private static final UriMatcher uriMatcher;

    static {
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI("com.example.myapp.provider", "data", DATA_LIST);
        uriMatcher.addURI("com.example.myapp.provider", "data/#", DATA_ITEM);
    }

    @Override
    public boolean onCreate() {
        // initialize your database or files here
        return true;
    }

    @Override
    public String getType(Uri uri) {
        switch (uriMatcher.match(uri)) {
            case DATA_LIST:
                return "vnd.android.cursor.dir/vnd.com.example.myapp.provider.data";
            case DATA_ITEM:
                return "vnd.android.cursor.item/vnd.com.example.myapp.provider.data";
            default:
                throw new IllegalArgumentException("Unsupported URI: " + uri);
        }
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        Cursor cursor = null;
        switch (uriMatcher.match(uri)) {
            case DATA_LIST:
                cursor = // query the database or files here and return the cursor
                break;
            case DATA_ITEM:
                // handle single item query here
                break;
            default:
                throw new IllegalArgumentException("Unsupported URI: " + uri);
        }
        return cursor;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        long id = // insert data into database or files here
        return ContentUris.withAppendedId(CONTENT_URI, id);
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        int count = // update data in database or files here
        return count;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        int count = // delete data from database or files here
        return count;
    }
}

然后，在AndroidManifest.xml文件中添加以下内容：

这会向Android系统注册ContentProvider。最后，在您的