Android Open Source - android-expandable-list-dock-header Main Activity

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Back to project page android-expandable-list-dock-header.

License

The source code is released under:

Apache License

Java Source Code

package com.josketres;
// ww w. j  av  a2s . c om
import java.util.ArrayList;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.LinearLayout;

@SuppressLint("InflateParams")
public class MainActivity extends Activity {

  private ArrayList<String> parentItems = new ArrayList<String>();
  private ArrayList<Object> childItems = new ArrayList<Object>();
  private MyExpandableListView expandableList;
  private Drawable mHeaderIconDrawable;

  @Override
  public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    // this is not really necessary as ExpandableListActivity contains an
    // ExpandableList
    setContentView(R.layout.activity_main);

    expandableList = (MyExpandableListView) findViewById(R.id.expandableListView);

    expandableList.setDividerHeight(2);
    expandableList.setGroupIndicator(null);
    expandableList.setClickable(true);

    setListHeader();
    setGroupParents();
    setChildData();

    MyExpandableListAdapter adapter = new MyExpandableListAdapter(
        parentItems, childItems);

    adapter.setInflater(
        (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE),
        this);
    expandableList.setAdapter(adapter);
    expandableList.setOnChildClickListener(new OnChildClickListener() {

      @Override
      public boolean onChildClick(ExpandableListView parent, View v,
          int groupPosition, int childPosition, long id) {

        expandableList.expandGroup(groupPosition);
        return false;
      }
    });

    expandableList.setOnScrollChangedListener(mOnScrollChangedListener);

    headerDock = (LinearLayout) findViewById(R.id.header_dock);
    headerDock.setVisibility(View.INVISIBLE);

    mHeaderIconDrawable = ((ImageView) findViewById(R.id.headerIcon))
        .getDrawable();
  }

  private void setListHeader() {

    headerView = getLayoutInflater().inflate(R.layout.list_header, null);
    expandableList.addHeaderView(headerView);

  }

  public void setGroupParents() {
    parentItems.add("Android");
    parentItems.add("Core Java");
    parentItems.add("Desktop Java");
    parentItems.add("Enterprise Java");
  }

  public void setChildData() {

    // Android
    ArrayList<String> child = new ArrayList<String>();
    child.add("Core");
    child.add("Games");
    childItems.add(child);

    // Core Java
    child = new ArrayList<String>();
    child.add("Apache");
    child.add("Applet");
    child.add("AspectJ");
    child.add("Beans");
    child.add("Crypto");
    childItems.add(child);

    // Desktop Java
    child = new ArrayList<String>();
    child.add("Accessibility");
    child.add("AWT");
    child.add("ImageIO");
    child.add("Print");
    childItems.add(child);

    // Enterprise Java
    child = new ArrayList<String>();
    child.add("EJB3");
    child.add("GWT");
    child.add("Hibernate");
    child.add("JSP");
    childItems.add(child);
  }

  private MyExpandableListView.OnScrollChangedListener mOnScrollChangedListener = new MyExpandableListView.OnScrollChangedListener() {
    public void onScrollChanged(ExpandableListView who, int t, int oldt,
        View firstChild) {

      int offset = headerView.getHeight() - headerDock.getHeight();
      Log.i("test", "offset:" + offset);

      if (firstChild == headerView) {
        Log.i("test", "top:" + t);
        Log.i("test", "oldtop:" + oldt);
        if (t < -offset && oldt >= -offset) {
          headerDock.setVisibility(View.VISIBLE);
        } else if (t >= -offset && oldt < -offset || t == 0) {
          headerDock.setVisibility(View.INVISIBLE);
        }

        float ratio = Math.min(1.0f, (float) 1.0
            - ((float) t / -offset));
        int newAlpha = (int) (ratio * 255);
        Log.i("test", "newAlpha:" + newAlpha);
        mHeaderIconDrawable.setAlpha(newAlpha);
      }

      /*
       * final int headerHeight = findViewById(R.id.image_header)
       * .getHeight() - getActionBar().getHeight(); final float ratio =
       * (float) Math.min(Math.max(t, 0), headerHeight) / headerHeight;
       * final int newAlpha = (int) (ratio * 255);
       * mActionBarBackgroundDrawable.setAlpha(newAlpha);
       */
    }
  };
  private LinearLayout headerDock;
  private View headerView;

}

Java Source Code List

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