分享一个Android封装精美、好用的菜单型PopupWindow

先上效果图：

就是这样一个菜单型的PopupWindow，现在说下是怎么弄的

package cn.edu.jxufe.popupwindowdemo; import android.content.Context; import android.graphics.drawable.BitmapDrawable; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.PopupWindow; import android.widget.TextView; import java.util.ArrayList; import java.util.List; public class PopupWindowUtil { private ListView listView; private PopupWindow window; //窗口在x轴偏移量 private int xOff = 0; //窗口在y轴的偏移量 private int yOff = 0; public PopupWindowUtil(Context context, List<String> datas) { window = new PopupWindow(context); //ViewGroup.LayoutParams.WRAP_CONTENT，自动包裹所有的内容 window.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT); window.setFocusable(true); //点击 back 键的时候，窗口会自动消失 window.setBackgroundDrawable(new BitmapDrawable()); View localView = LayoutInflater.from(context).inflate(R.layout.lv_pw_menu, null); listView = (ListView) localView.findViewById(R.id.lv_pop_list); listView.setAdapter(new MyAdapter(context, datas)); listView.setTag(window); //设置显示的视图 window.setContentView(localView); } public void setItemClickListener(AdapterView.OnItemClickListener listener) { listView.setOnItemClickListener(listener); } public void dismiss() { window.dismiss(); } /** * @param xOff x轴（左右）偏移 * @param yOff y轴（上下）偏移 */ public void setOff(int xOff, int yOff) { this.xOff = xOff; this.yOff = yOff; } /** * @param paramView 点击的按钮 */ public void show(View paramView, int count) { //该count 是手动调整窗口的宽度 window.setWidth(paramView.getWidth() * count); //设置窗口显示位置, 后面两个0 是表示偏移量，可以自由设置 window.showAsDropDown(paramView, xOff, yOff); //更新窗口状态 window.update(); } class MyAdapter extends BaseAdapter { private Context context; private List<String> mDatas; public MyAdapter(Context context, List<String> datas) { this.context = context; if (datas == null) { datas = new ArrayList<>(); } mDatas = datas; } @Override public int getCount() { return mDatas.size(); } @Override public Object getItem(int position) { return mDatas.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { TextView tvItem; if (convertView == null) { convertView = LayoutInflater.from(context).inflate(R.layout.lv_item_pw_menu, null); tvItem = (TextView) convertView.findViewById(R.id.tv_item_pw_menu); convertView.setTag(tvItem); } else { tvItem = (TextView) convertView.getTag(); } tvItem.setText(getItem(position) + ""); return convertView; } } }

再看看Activity中是怎么调用的

public class MenuActivity extends Activity { private Context context = this; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_menu); } //菜单按钮onClick事件 public void menuClick(View view) { final List<String> items = new ArrayList<>(); items.add("第一项"); items.add("第二项"); items.add("第三项"); items.add("第四项"); final PopupWindowUtil popupWindow = new PopupWindowUtil(context, items); popupWindow.setItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { popupWindow.dismiss(); Toast.makeText(context, "你点击了" + items.get(position), Toast.LENGTH_SHORT).show(); } }); //根据后面的数字 手动调节窗口的宽度 popupWindow.show(view, 4); } }

接下来是布局文件 lv_item_pw_menu ListView的item布局

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:gravity="center_vertical" android:layout_width="match_parent" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:background="@android:color/transparent" android:layout_marginBottom="8dp" android:layout_height="wrap_content"> <TextView android:layout_width="match_parent" android:gravity="center" android:drawablePadding="3dp" android:padding="7dp" android:text="测试数据" android:id="@+id/tv_item_pw_menu" android:textSize="18sp" android:layout_height="wrap_content" /> </RelativeLayout>

窗口的布局 lv_pw_menu.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:background="@drawable/menu" android:layout_height="match_parent" android:paddingBottom="15.0dip" android:paddingLeft="6.0dip" android:paddingRight="6.0dip" android:paddingTop="20.0dip"> <ListView android:id="@+id/lv_pop_list" android:layout_width="match_parent" android:layout_height="match_parent" android:cacheColorHint="@null" android:scrollbars="none" /> </LinearLayout>

就这样，以后就可以直接在activity中调用，且无需在工具类中修改