Android Open Source - ListIndex Index View

• Back to UI ListView/Display  ↑

From Project

Back to project page ListIndex.

License

The source code is released under:

Apache License

Java Source Code

package com.nozomi.listindex.view;
/*www. j av  a2s.c om*/
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Color;
import android.os.Build;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class IndexView extends LinearLayout {
  public IndexView(Context context) {
    super(context);
  }

  public IndexView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  public IndexView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
  }

  public void init(final ListView listView, final TextView textView) {
    setOrientation(VERTICAL);

    addTextView('#');
    for (int i = 0; i < 26; i++) {
      addTextView((char) ('A' + i));
    }

    final Animation animation = new AlphaAnimation(1, 0);
    animation.setDuration(1500);
    animation.setFillAfter(true);

    final ListAdapter listAdapter = listView.getAdapter();

    setOnTouchListener(new OnTouchListener() {

      @Override
      public boolean onTouch(View v, MotionEvent event) {

        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_MOVE:
          int position = (int) (event.getY() * 27 / v.getHeight());
          if (position >= 0 && position <= 26) {
            char c;
            int localPosition;
            if (position == 0) {
              c = '#';
              localPosition = 0;
            } else {
              c = (char) ('A' - 1 + position);
              localPosition = searchPosition(listAdapter, c);
            }
            if (localPosition != -1) {
              listView.setSelection(localPosition);
            }
            textView.setText(String.valueOf(c));
            if (textView.getVisibility() == View.GONE) {
              textView.setVisibility(View.VISIBLE);
            }
            textView.startAnimation(animation);
          } else {
            listView.setSelection(0);
          }
          return true;
        }
        return false;

      }
    });
  }

  private void addTextView(char c) {
    TextView textView = new TextView(getContext());
    textView.setText(String.valueOf(c));
    textView.setTextColor(Color.WHITE);
    textView.setGravity(Gravity.CENTER);
    LinearLayout.LayoutParams lllp = new LinearLayout.LayoutParams(
        LinearLayout.LayoutParams.MATCH_PARENT, 0);
    lllp.weight = 1;
    addView(textView, lllp);
  }

  private int searchPosition(ListAdapter listAdapter, char c) {
    for (int i = 0; i < listAdapter.getCount(); i++) {
      if (c == ((IndexString) (listAdapter.getItem(i))).getFirstChar()) {
        return i;
      }
    }
    return -1;
  }
}

Java Source Code List

• Back to UI ListView/Display  ↑