public class RecyclerView extends AppCompatActivity implements View.OnTouchListener {


    android.support.v7.widget.RecyclerView recyclerView;
    ArrayList<String> imageList = new ArrayList<String>();
    String album_name = "";
    String path_album = "";
    GalleryAdapter adapter;
    private int scala = 2;
    private double scalaList = 1;
    private boolean check;
    private ScaleGestureDetector mScaleGestureDetector;
    private float mScaleFactor = 1.0f;

    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
        @Override
        public boolean onScale(ScaleGestureDetector scaleGestureDetector) {
            mScaleFactor *= scaleGestureDetector.getScaleFactor();
            mScaleFactor = Math.max(0.5f,
                    Math.min(mScaleFactor, 1.5f));

            if (check) {
                scala = (int) (mScaleFactor * 5);

                recyclerView.setLayoutManager(new GridLayoutManager(RecyclerView.this, scala));

            } else {
                scalaList = mScaleFactor / 1.5;

                adapter.setScala(scalaList);
                recyclerView.setLayoutManager(new LinearLayoutManager(RecyclerView.this));
            }
            return false;
        }
    }

/*    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.mainoptions, menu);
        return super.onCreateOptionsMenu(menu);
    }*/


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rec_view);
        View view2 = findViewById(R.id.recycler_view);
        view2.setOnTouchListener(this);
        mScaleGestureDetector = new ScaleGestureDetector(this, new ScaleListener());
        Intent intent = getIntent();
        album_name = intent.getStringExtra("name");
        path_album = intent.getStringExtra("path");
        setTitle(album_name);
        check = intent.getBooleanExtra("bol", true);
        recyclerView = findViewById(R.id.recycler_view);
        if (check) {
            recyclerView.setLayoutManager(new GridLayoutManager(this, scala));

        } else
            recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setHasFixedSize(true);
        LinearLayoutManager dd = new LinearLayoutManager(this);

        File album = new File(path_album);
        for (File f : album.listFiles()) {

            imageList.add(f.getPath());
            System.out.println(f.getPath());
        }

        adapter = new GalleryAdapter(RecyclerView.this, imageList);
        recyclerView.setAdapter(adapter);

    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        mScaleGestureDetector.onTouchEvent(event);
        return false;
    }


}