Half Circle List View

HalfCircleListView.java

import android.widget.ListView;
import android.widget.AbsListView;
import android.content.Context;

public class HalfCircleListView extends ListView implements AbsListView.OnScrollListener {
    public HalfCircleListView(Context context) {
        super(context);
        setOnScrollListener(this);
    }


    @Override
    public void onScrollStateChanged(AbsListView absListView, int i) {
        //Ignored
    }

    @Override
    public void onScroll(AbsListView absListView, int i, int i2, int i3) {
        //Part of the magic happens here
        absListView.invalidateViews();
    }
}

MyActivity.java

import android.content.Context;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;

public class MyActivity extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        ListView listView = new HalfCircleListView(this);
        List<String> listOfStrings = new ArrayList<String>();
        for(int i = 0; i < 50 ; i++){
            listOfStrings.add("Value " + i);
        }
        listView.setAdapter(new ScrollAdapter(listOfStrings));
        setContentView(listView);
    }
}

MyView.java

import android.widget.TextView;
import android.content.Context;
import android.graphics.Canvas;
import android.util.DisplayMetrics;
import android.content.res.Resources;

public class MyView extends TextView {

    private static final int MAX_INDENT = 300;
    private static final String TAG = MyView.class.getSimpleName();

    public MyView(Context context) {
        super(context);
    }

    public void onDraw(Canvas canvas){
        canvas.save();
        float indent = getIndent(getY());
        //Part of the magic happens here too
        canvas.translate(indent, 0);
        super.onDraw(canvas);
        canvas.restore();
    }

    public float getIndent(float distance){
        float x_vertex = MAX_INDENT;
        DisplayMetrics displayMetrics = getContext().getResources().getDisplayMetrics();
        float y_vertex = displayMetrics.heightPixels / 2 / displayMetrics.density;
        double a = ( 0 - x_vertex ) / ( Math.pow(( 0 - y_vertex), 2) ) ;
        float indent = (float) (a * Math.pow((distance - y_vertex), 2) + x_vertex);
        return indent;
    }
}

ScrollAdapter.java

import java.util.List;
import android.widget.BaseAdapter;
import android.view.ViewGroup;
import android.view.View;
import android.util.Log;

public class ScrollAdapter extends BaseAdapter {

    private List<String> scrollViews;
    private static final String TAG = ScrollAdapter.class.getSimpleName();

    public ScrollAdapter(List<String> scrollViews){

        this.scrollViews = scrollViews;
    }
    @Override
    public int getCount() {
        return scrollViews.size();
    }

    @Override
    public String getItem(int i) {
        return scrollViews.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }



    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        if(view == null){
            view = new MyView(viewGroup.getContext());
        }
        MyView currentView = (MyView) view;
        String itemViewType = getItem(i);
        Log.d(TAG, itemViewType);
        ((MyView) view).setText(itemViewType);
        return currentView;
    }
}

how can i set image in this instead of text?

Thanks very much!

to be honest it works quite bad

how can i set text with image in this soulotion?

Hello,

I was trying to make this circular list horizontally, instead of vertically, but not getting the expected result.
Could you please tell me, what exact changes are required to make the horizontal circular list.

Thanks,
Sumeet Guha.