Android自定义下拉菜单/弹出菜单

吾生也有涯,而知也无涯。这篇文章主要讲述Android自定义下拉菜单/弹出菜单相关的知识,希望能为你提供帮助。
如何使用锚定到按钮的自定义下拉菜单/弹出菜单?
我需要它像弹出菜单(锚定到视图)一样工作,并在我单击菜单中的项目时执行某些操作。
如何通过代码向菜单添加项目,保持菜单的高度,如果有超过5个项目,可以滚动它。我不需要添加任何图像,只需添加文本。

答案在android中创建弹出菜单。
【Android自定义下拉菜单/弹出菜单】activity_main.xml中
它只包含一个按钮。
文件:activity_main.xml

< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > < Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="62dp" android:layout_marginTop="50dp" android:text="Show Popup" /> < /RelativeLayout>

popup_menu.xml
它包含三个项目,如下所示。它在res / menu目录中创建。文件:poupup_menu.xml
< menu xmlns:android="http://schemas.android.com/apk/res/android" > < item android:id="@+id/one" android:title="One"/> < item android:id="@+id/two" android:title="Two"/> < item android:id="@+id/three" android:title="Three"/> < /menu>

活动类
它会在按钮单击时显示弹出菜单。文件:MainActivity.java
public class MainActivity extends Activity { private Button button1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button1 = (Button) findViewById(R.id.button1); button1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { //Creating the instance of PopupMenu PopupMenu popup = new PopupMenu(MainActivity.this, button1); //Inflating the Popup using xml file popup.getMenuInflater() .inflate(R.menu.popup_menu, popup.getMenu()); //registering popup with OnMenuItemClickListener popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() { public boolean onMenuItemClick(MenuItem item) { Toast.makeText( MainActivity.this, "You Clicked : " + item.getTitle(), Toast.LENGTH_SHORT ).show(); return true; } }); popup.show(); //showing popup menu } }); //closing the setOnClickListener method } }

要以编程方式添加:
PopupMenu menu = new PopupMenu(this, view); menu.getMenu().add("One"); menu.getMenu().add("Two"); menu.getMenu().add("Three"); menu.show();

按照this链接以编程方式创建菜单。
另一答案我知道这是一个老问题,但我找到了另一个对我来说更好的答案,它似乎没有出现在任何答案中。
创建布局xml:
< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingTop="5dip" android:paddingBottom="5dip" android:paddingStart="10dip" android:paddingEnd="10dip"> < ImageView android:id="@+id/shoe_select_icon" android:layout_width="30dp" android:layout_height="30dp" android:layout_gravity="center_vertical" android:scaleType="fitXY" /> < TextView android:id="@+id/shoe_select_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:textSize="20sp" android:paddingStart="10dp" android:paddingEnd="10dp"/> < /LinearLayout>

创建一个ListPopupWindow和一个包含内容的地图:
ListPopupWindow popupWindow; List< HashMap< String, Object> > data = https://www.songbingjia.com/android/new ArrayList< > (); HashMap< String, Object> map = new HashMap< > (); map.put(TITLE, getString(R.string.left)); map.put(ICON, R.drawable.left); data.add(map); map = new HashMap< > (); map.put(TITLE, getString(R.string.right)); map.put(ICON, R.drawable.right); data.add(map);

然后单击,使用此功能显示菜单:
private void showListMenu(final View anchor) { popupWindow = new ListPopupWindow(this); ListAdapter adapter = new SimpleAdapter( this, data, R.layout.shoe_select, new String[] {TITLE, ICON}, // These are just the keys that the data uses (constant strings) new int[] {R.id.shoe_select_text, R.id.shoe_select_icon}); // The view ids to map the data topopupWindow.setAnchorView(anchor); popupWindow.setAdapter(adapter); popupWindow.setWidth(400); popupWindow.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView< ?> parent, View view, int position, long id) { switch (position){ case 0: devicesAdapter.setSelectedLeftPosition(devicesList.getChildAdapterPosition(anchor)); break; case 1: devicesAdapter.setSelectedRightPosition(devicesList.getChildAdapterPosition(anchor)); break; default: break; } runOnUiThread(new Runnable() { @Override public void run() { devicesAdapter.notifyDataSetChanged(); } }); popupWindow.dismiss(); } }); popupWindow.show(); }

另一答案Kotlin方式
fun showPopupMenu(view: View) { PopupMenu(view.context, view).apply { menuInflater.inflate(R.menu.popup_men, menu) setOnMenuItemClickListener { item -> Toast.makeText(view.context, "You Clicked : " + item.title, Toast.LENGTH_SHORT).show() true } }.show() }

更新:在上面的代码中,apply函数返回不需要的this,因此我们可以使用不返回任何内容的run并使其更简单,我们也可以删除showPopupMenu方法的花括号。
更简单:
fun showPopupMenu(view: View) = PopupMenu(view.context, view).run { menuInflater.inflate(R.menu.popup_men, menu) setOnMenuItemClickListener { item -> Toast.makeText(view.context, "You Clicked : ${item.title}", Toast.LENGTH_SHORT).show() true } show() }

另一答案首先,在“res”文件夹中创建名为“menu”的文件夹。
< ?xml version="1.0" encoding="utf-8"?> < menu xmlns:android="http://schemas.android.com/apk/res/android" > < item android:id="@+id/search" android:icon="@android:drawable/ic_menu_search" android:title="Search"/> < item android:id="@+id/add" android:icon="@android:drawable/ic_menu_add" android:title="Add"/> < item android:id="@+id/edit" android:icon="@android:drawable/ic_menu_edit" android:title="Edit"> < menu> < item android:id="@+id/share" android:icon="@android:drawable/ic_menu_share" android:title="Share"/> < /menu> < /item> < /menu>

然后,创建您的活动类:
public class Popup

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