Android中的下拉选择菜单（封装控件）

来源：互联网发布：及之而后知编辑：程序博客网时间：2024/06/07 09:42

在应用中常见的一种点击下拉菜单，应用次数很多，今天找时间抽取出来封装成类。( 源码在底部 )

先看一眼效果图：

这里写图片描述

功能介绍：

菜单按钮的默认内容可以自定义；
下拉菜单的内容可以自定义；
选中菜单中的内容后，菜单按钮进行切换，并且收起下拉菜单；

下边是代码：

public class PullDownMenu extends LinearLayout {    // 选中之后是否需要搜索    private boolean needSearch;    // 下拉框    private PopupWindow popupWindow;    // 下拉框数据    private List<String> mStringList;    // 顶部位置    private TextView tvPullDown;    // 顶部位置显示的内容    private String topTitle;    private ListView listView;    private View viewList;    private SimpleAdapter simpleAdapter;    private List<HashMap<String, String>> hashMaps;    public PullDownMenu(Context context) {        super(context);        init();    }    public PullDownMenu(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public PullDownMenu(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        View view = LayoutInflater.from(getContext()).inflate(R.layout.pull_down_menu_layout, null);        addView(view, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));        tvPullDown = (TextView) findViewById(R.id.tvPullDown);        hashMaps = new ArrayList<HashMap<String, String>>();//      // 模拟加载数据//      loadData();        tvPullDown.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                if (popupWindow != null && popupWindow.isShowing()) {                    popupWindow.dismiss();                } else {                    viewList = LayoutInflater.from(getContext()).inflate(R.layout.pop_menulist, null);                    listView = (ListView) viewList.findViewById(R.id.menulist);                    simpleAdapter = new SimpleAdapter(getContext(), hashMaps, R.layout.pop_menuitem,                            new String[]{"item"}, new int[]{R.id.menuitem});                    listView.setAdapter(simpleAdapter);                    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {                        @Override                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                            String stringItem = hashMaps.get(position).get("item");                            tvPullDown.setText(stringItem);                            if (popupWindow != null && popupWindow.isShowing()) {                                popupWindow.dismiss();                            }                            // 选择菜单后进行的操作                            search();                        }                    });                    popupWindow = new PopupWindow(viewList, tvPullDown.getWidth(), LayoutParams.WRAP_CONTENT);                    ColorDrawable cd = new ColorDrawable(-0000);                    popupWindow.setBackgroundDrawable(cd);                    popupWindow.setAnimationStyle(R.style.PopupAnimation);                    popupWindow.update();                    popupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);                    popupWindow.setTouchable(true);                    popupWindow.setOutsideTouchable(true);                    popupWindow.setFocusable(true);                    int topHeight = tvPullDown.getBottom();                    popupWindow.showAsDropDown(tvPullDown, 0, 0);                    popupWindow.setTouchInterceptor(new OnTouchListener() {                        @Override                        public boolean onTouch(View v, MotionEvent event) {                            if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {                                popupWindow.dismiss();                                return true;                            }                            return false;                        }                    });                }            }        });    }    private void search(){    }    public void setData(String title, List<String> strings, boolean needSearch) {        this.topTitle = title;        this.mStringList = strings;        this.needSearch = needSearch;        tvPullDown.setText(topTitle);        if (hashMaps !=null){            hashMaps.clear();        }        for (String string : mStringList) {            HashMap<String, String> hashMap = new HashMap<String, String>();            hashMap.put("item", string);            hashMaps.add(hashMap);        }    }

菜单按钮布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView         android:id="@+id/tvPullDown"        android:layout_width="100dp"        android:layout_height="wrap_content"        android:text="菜单"        android:textSize="16sp"        android:gravity="center"        android:drawableRight="@drawable/down"        android:drawablePadding="5dp"/></LinearLayout>

Activity中调用：

public class MainActivity extends AppCompatActivity {    private PullDownMenu pullDownMenu;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();    }    private void init() {        pullDownMenu=(PullDownMenu)findViewById(R.id.tvPullDownMenu);        List<String> stringList=new ArrayList<>();        stringList.add("语文");        stringList.add("数学");        stringList.add("英语");        stringList.add("物理");        stringList.add("物理");        pullDownMenu.setData("选项学科",stringList,false);    }}

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