Android用PopupWindow实现弹出菜单实例(3)

step3:MainActivity.java

package cn.roco.popwindow;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import Android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ListAdapter;
import android.widget.PopupWindow;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
 private PopupWindow popupWindow;
 private View parent;
 /**菜单弹出来时候的菜单项图案*/
 private int[] images = { R.drawable.i1, R.drawable.i2, R.drawable.i3,
   R.drawable.i4, R.drawable.i5, R.drawable.i6, R.drawable.i7,
   R.drawable.i8 };
 /**菜单弹出来时候的菜单项文字*/
 private String[] names = { "搜索", "文件管理", "下载管理", "全屏", "网址", "书签", "加入书签",
   "分享页面" };

@Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  /**PopupWindow的界面*/
  View contentView = getLayoutInflater()
    .inflate(R.layout.popwindow, null);
  /**网格布局界面*/
  GridView gridView = (GridView) contentView.findViewById(R.id.gridView);
  /**设置网格布局的适配器*/
  gridView.setAdapter(getAdapter());
  /**设置网格布局的菜单项点击时候的Listener*/
  gridView.setOnItemClickListener(new ItemClickListener());
  /**初始化PopupWindow*/
  popupWindow = new PopupWindow(contentView,
    ViewGroup.LayoutParams.MATCH_PARENT,
    ViewGroup.LayoutParams.WRAP_CONTENT);
  popupWindow.setFocusable(true);// 取得焦点
  popupWindow.setBackgroundDrawable(new BitmapDrawable());
  /**设置PopupWindow弹出和退出时候的动画效果*/
  popupWindow.setAnimationStyle(R.style.animation);
 
  parent = this.findViewById(R.id.main);
 }
 
 private final class ItemClickListener implements OnItemClickListener{
  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position,
    long id) {
   if (popupWindow.isShowing()) {
    popupWindow.dismiss();//关闭
   }
  }
 }
 
 /**返回网格布局的适配器*/
 private ListAdapter getAdapter() {
  List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
  for (int i = 0; i < images.length; i++) {
   HashMap<String, Object> item = new HashMap<String, Object>();
   item.put("image", images[i]);
   item.put("name", names[i]);
   data.add(item);
  }
  SimpleAdapter simpleAdapter = new SimpleAdapter(this, data,
    R.layout.grid_item, new String[] { "image", "name" },
    new int[] { R.id.imageView, R.id.textView });
  return simpleAdapter;
 }

public void openPopWindow(View v) {
  /**设置PopupWindow弹出后的位置*/
  popupWindow.showAtLocation(parent, Gravity.BOTTOM, 0, 0);
 }
}