Bdtjtk

I want to create a simple android wallpaper app just for practice.
So I added pictures to an assets folder, and I want to show them in a gridview.
I created it, but for some reason the pictures in the gridview doesn't appear in squares rather in a large height format.
I'm attaching my code if anyone can see where the problem is:

this is how it looks like:

you can see that it creates rectangles instead of equal squares.

MainActivity:

@Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        GridView gridView = (GridView)findViewById(R.id.gridview);

        gridView.setAdapter(new ImageAdapter(this));

    }

ImageAdapter:

public class ImageAdapter extends BaseAdapter {

private Context context;

private String list;



public ImageAdapter(Context c) {

    context = c;

    try {

        list = context.getAssets().list("imgs");

    } catch (IOException e) {

        e.printStackTrace();

    }

}



public int getCount() {return list.length;}

public Object getItem(int position) {return null;}

public long getItemId(int position) {return 0;}



public View getView(int position, View convertView, ViewGroup parent) {

    ImageView img;

    if (convertView == null) {

        img = new ImageView(context);

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

        img.setLayoutParams(new GridView.LayoutParams(params));

        img.setScaleType(ImageView.ScaleType.CENTER);

        img.setPadding(8, 8, 8, 8);

    } else {

        img = (ImageView) convertView;

    }

    try {

        InputStream ims = context.getAssets().open("imgs/" + list[position]);

        Bitmap bitmap = BitmapFactory.decodeStream(ims);

        img.setImageBitmap(bitmap);

    } catch (IOException e) {

        e.printStackTrace();

    }

    return img;

 }

}

and this is the xml layout:

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">



<GridView

    android:id="@+id/gridview"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:verticalSpacing="0dp"

    android:horizontalSpacing="0dp"

    android:stretchMode="columnWidth"

    android:numColumns="2"/>



</android.support.constraint.ConstraintLayout>

@TheDragoner Your gridview is using Wrap Content as its Layout Params i.e. LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

As a result it the grid takes the actual image's height and width.
Change LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(getResources().getDimensionPixelOffset(R.dimen.dp_100), getResources().getDimensionPixelOffset(R.dimen.dp_100));