Custom size edit

ImgSizeEdit.java

import android.print.PrintAttributes;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Spinner;

import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.MutableLiveData;

import com.google.android.material.textfield.TextInputEditText;
import com.google.android.material.textview.MaterialTextView;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;


public class ImgSizeEdit {
    public interface onChangeListener{
        void onChange(PrintAttributes.MediaSize newValue);
    }

    public static LinkedHashMap<String,String> taxonomy;
    static {
        taxonomy = new LinkedHashMap<>();
        taxonomy.put("mils","Mils");
        taxonomy.put("in","Inches");
        taxonomy.put("mm","mm");
        taxonomy.put("cm","cm");
    }
    private int widthPx = 0;
    private int heightPx = 0;

    private int rotation = 0;

    private int mode = 0;

    private View view;
    private TextInputEditText editWidth;
    private TextInputEditText editHeight;

    private String taxonomyValue = "cm";

    private LinkedHashMapAdapter<String,String> adapter;
    private MaterialTextView textView;
    private final MutableLiveData<String> info = new MutableLiveData<>("");

    private boolean isInit = false;

    private onChangeListener callback = null;

    public void setSourceSize(int w, int h){
        if(isInit)return;
        isInit = true;
        _setSourceSize(w,h);
    }

    private void _showInfo(){
        info.setValue(String.format("%s %s x %s px, %s°",
                mode == 0 ?"Crop":"Fit",
                widthPx,
                heightPx,
                rotation));
    }

    private void _setSourceSize(int w, int h){
        widthPx = w;
        heightPx = h;
        _showInfo();
    }

    public void bind(View v, LifecycleOwner owner, onChangeListener callback){
        view = v;
        this.callback = callback;
        Spinner spinner = v.findViewById(android.R.id.toggle);
        textView = v.findViewById(android.R.id.summary);
        editWidth = v.findViewById(android.R.id.text1);
        editHeight = v.findViewById(android.R.id.text2);

        adapter = new LinkedHashMapAdapter<>(view.getContext(),
                android.R.layout.simple_spinner_item,
                taxonomy
        );
        adapter.setDropDownViewResource(android.R.layout.simple_list_item_single_choice);

        spinner.setAdapter(adapter);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                Map.Entry<String,String> entity = adapter.getItem(position);
                setTaxonomyValue(entity.getKey());
                notifyCallback(true);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
        spinner.setSelection(adapter.getPosition(taxonomyValue));
        editHeight.setOnFocusChangeListener((v1, hasFocus) -> {
            if(!hasFocus){
                notifyCallback(false);
            }
        });
        editWidth.setOnFocusChangeListener((v1, hasFocus) -> {
            if(!hasFocus){
                notifyCallback(false);
            }
        });
        info.observe(owner, s -> textView.setText(s));
    }

    public void setTaxonomyValue(String v) {
        taxonomyValue = v;
    }

    public void setRotation(int rotation) {
        int oldRotation = this.rotation;
        this.rotation = rotation;
        int a = (rotation/90)%2;
        int b = (oldRotation/90)%2;
        if( a == b ) {
            _showInfo();
            return;
        }
        _setSourceSize(heightPx,widthPx);
    }

    public void setMode(int mode) {
        this.mode = mode;
        _showInfo();
    }

    public void setVisible(int visible){
        view.setVisibility(visible);
    }

    public int getWidthMils(){
        int w;
        try {
            Float v = Float.parseFloat(Objects.requireNonNull(editWidth.getText()).toString());
            w = calcMils(v);

        }catch (Exception e){
             w = 0;
        }
        return Math.max(w, 500);
    }
    public int getHeightMils(){
        int h;
        try {
            Float v = Float.parseFloat(Objects.requireNonNull(editHeight.getText()).toString());
            h = calcMils(v);
        }catch (Exception e){
            h =0;
        }
        return Math.max(h,500);
    }
    public PrintAttributes.MediaSize getMediaSize(){
        return new PrintAttributes.MediaSize("custom","Custom size",getWidthMils(),getHeightMils());
    }
    private int calcMils(Float v){
        switch (taxonomyValue){
            case "in":
                return Math.round(v*1000);
            case "cm":
                return Math.round(v*(float)393.7);
            case "mm":
                return Math.round(v*(float)39.37);
        }
        return Math.round(v);
    }

    private int widthMils = 0;
    private int heightMils = 0;

    void notifyCallback(boolean force){
        int w = getWidthMils();
        int h = getHeightMils();

        if(force || w!=widthMils || h!=heightMils){
            widthMils = w;
            heightMils = h;
            callback.onChange(getMediaSize());
        }
    }
}