Android 弹出菜单不适用于arrayAdapter listview
我有一个图像视图作为数组adpater/listview的一部分。imageView是listview中每个项目左侧的设置图标。当用户单击图像时,会显示一个弹出菜单。但到目前为止,我还不能看到菜单。我已经为图像实现了一个setOnClickListener,但仍然没有成功。有人能告诉我我做错了什么吗。弹出菜单是在适配器中实现的还是在活动中实现的?到目前为止,我两种都试过了,但都不起作用。谢谢 主要活动Android 弹出菜单不适用于arrayAdapter listview,android,xml,listview,android-arrayadapter,popupmenu,Android,Xml,Listview,Android Arrayadapter,Popupmenu,我有一个图像视图作为数组adpater/listview的一部分。imageView是listview中每个项目左侧的设置图标。当用户单击图像时,会显示一个弹出菜单。但到目前为止,我还不能看到菜单。我已经为图像实现了一个setOnClickListener,但仍然没有成功。有人能告诉我我做错了什么吗。弹出菜单是在适配器中实现的还是在活动中实现的?到目前为止,我两种都试过了,但都不起作用。谢谢 主要活动 package com.example.george.hostscanmenus; impo
package com.example.george.hostscanmenus;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
List hostList;
ArrayAdapter<String> hostAdapter;
PopupMenu popup;
String subnet = "192.168.10.";
ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
hostList = new ArrayList<String>();
//populating host addresses
for(int i = 0; i < 255; i++) {
hostList.add(subnet+i +"-aa:bb:00:cc:33:ee");
}
//inflating adapter
listView = (ListView) findViewById(R.id.scan_list);
hostAdapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.host_item, R.id.ip_address, hostList);
listView.setAdapter(hostAdapter);
}
}
package com.example.george.hostScanMenu;
导入android.content.Intent;
导入android.support.v7.app.AppActivity;
导入android.os.Bundle;
导入android.view.MenuInflater;
导入android.view.MenuItem;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.ArrayAdapter;
导入android.widget.ImageView;
导入android.widget.ListView;
导入android.widget.PopupMenu;
导入android.widget.TextView;
导入android.widget.Toast;
导入java.util.ArrayList;
导入java.util.List;
公共类MainActivity扩展了AppCompatActivity{
名单;
阵列适配器;
弹出菜单弹出;
字符串subnet=“192.168.10。”;
列表视图列表视图;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
hostList=newarraylist();
//填充主机地址
对于(int i=0;i<255;i++){
添加(子网+i+“-aa:bb:00:cc:33:ee”);
}
//充气适配器
listView=(listView)findViewById(R.id.scan\u列表);
hostAdapter=new ArrayAdapter(getApplicationContext(),R.layout.host\u项,R.id.ip\u地址,主机列表);
setAdapter(主机适配器);
}
}
适配器
package com.example.george.hostscanmenus;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
/**
* Created by george on 8/11/17.
*/
public class HostAdapter extends ArrayAdapter<String> {
public HostAdapter(Context context, int num, ArrayList<String> allHost) {
super(context, 0, allHost);
}
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
String host = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_main, parent, false);
}
// Lookup view for data population
ImageView settingImgView = (ImageView) convertView.findViewById(R.id.settings_img);
ImageView nodeHostImgView = (ImageView) convertView.findViewById(R.id.host_icon);
TextView nodeIpTxtView = (TextView) convertView.findViewById(R.id.ip_address);
TextView nodeMacTxtView = (TextView) convertView.findViewById(R.id.mac_address);
ImageView nodeArrowImgView = (ImageView) convertView.findViewById(R.id.port_scan_arrow);
// Populate the data into the template view using the data object
settingImgView.setImageResource(R.drawable.ic_action_more_vert);
nodeHostImgView.setImageResource(R.drawable.ic_computer_white_24dp);
nodeIpTxtView.setText(host.substring(0,host.indexOf("-")));
nodeMacTxtView.setText(host.substring(host.indexOf("-")));
nodeArrowImgView.setImageResource(R.drawable.ic_keyboard_arrow_right_white_24dp);
settingImgView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showPopupMenu(view);
}
});
// Return the completed view to render on screen
return convertView;
}
/* code for popup menu in listview */
public void showPopupMenu(View v) {
PopupMenu popup = new PopupMenu(getContext(), v);
popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.change_icon:
Toast.makeText(getContext(), menuItem.getTitle(), Toast.LENGTH_SHORT).show();
return true;
case R.id.notifications:
Toast.makeText(getContext(), menuItem.getTitle(), Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
});
MenuInflater inflater = popup.getMenuInflater();
inflater.inflate(R.menu.host_menu, popup.getMenu());
popup.show();
}
}
package com.example.george.hostScanMenu;
导入android.content.Context;
导入android.support.annotation.NonNull;
导入android.support.v7.app.AppActivity;
导入android.view.LayoutInflater;
导入android.view.MenuInflater;
导入android.view.MenuItem;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ArrayAdapter;
导入android.widget.ImageView;
导入android.widget.PopupMenu;
导入android.widget.TextView;
导入android.widget.Toast;
导入java.util.ArrayList;
/**
*乔治于2017年8月11日创作。
*/
公共类HostAdapter扩展了ArrayAdapter{
公共主机适配器(上下文上下文,int num,ArrayList allHost){
super(上下文,0,allHost);
}
@非空
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
//获取此职位的数据项
字符串host=getItem(位置);
//检查是否正在重用现有视图,否则会膨胀视图
if(convertView==null){
convertView=LayoutInflater.from(getContext()).flate(R.layout.activity_main,parent,false);
}
//数据填充的查找视图
ImageView设置imgView=(ImageView)convertView.findViewById(R.id.settings\u img);
ImageView节点hostimgView=(ImageView)convertView.findViewById(R.id.host_图标);
TextView nodeIpTxtView=(TextView)convertView.findViewById(R.id.ip_地址);
TextView节点mactxtview=(TextView)convertView.findViewById(R.id.mac_地址);
ImageView节点arrowimgview=(ImageView)convertView.findViewById(R.id.port\u scan\u箭头);
//使用数据对象将数据填充到模板视图中
settingImgView.setImageResource(R.drawable.ic\u action\u more\u vert);
nodeHostImgView.setImageResource(R.drawable.ic_computer_white_24dp);
nodeIpTxtView.setText(host.substring(0,host.indexOf(“-”));
nodeMacTxtView.setText(host.substring(host.indexOf(“-”));
noderarrowimgview.setImageResource(R.drawable.ic_键盘_箭头_右键_白色_24dp);
settingImgView.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
显示弹出菜单(视图);
}
});
//返回要在屏幕上渲染的已完成视图
返回视图;
}
/*listview中弹出菜单的代码*/
公共无效显示弹出菜单(视图v){
PopupMenu popup=新的PopupMenu(getContext(),v);
setOnMenuItemClickListener(新的PopupMenu.OnMenuItemClickListener(){
@凌驾
公共布尔onMenuItemClick(MenuItem MenuItem){
开关(menuItem.getItemId()){
案例R.id.change_图标:
Toast.makeText(getContext(),menuItem.getTitle(),Toast.LENGTH_SHORT).show();
返回true;
案例R.id.通知:
Toast.makeText(getContext(),menuItem.getTitle(),Toast.LENGTH_SHORT).show();
返回true;
违约:
返回false;
}
}
});
MenuInflater充气器=弹出窗口。getMenuInflater();
充气器。充气(R.menu.host_菜单,popup.getMenu());
popup.show();
}
}
列表项xml文件
<?xml version="1.0" encoding="utf-8"?>
<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="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:id="@+id/text_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="@+id/settings_img"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.10"
android:padding="3dp"
android:src="@drawable/ic_action_more_vert"/>
<ImageView
android:id="@+id/host_icon"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.20"
android:padding="5dp"
android:src="@drawable/ic_computer_white_24dp"/>
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="0.50"
android:orientation="vertical"
android:paddingLeft="0dp"
>
<TextView
android:id="@+id/ip_address"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18dp"
tools:text="192.168.10.100"
/>
<TextView
android:id="@+id/mac_address"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="16dp"
tools:text="aa:bb:cc:00:11:22"
/>
</LinearLayout>
<ImageView
android:id="@+id/port_scan_arrow"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="0.20"
android:padding="5dp"
android:src="@drawable/ic_keyboard_arrow_right_white_24dp"/>
</LinearLayout>
</RelativeLayout>
主xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/scan_list_linear"
tools:context=".MainActivity">
<!--Listview to display scan output-->
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/scan_list"/>
</LinearLayout>
菜单xml
<!-- listview menu for host scan options eg:
change hostname, icon, notification etc -->
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<!-- Settings, should always be in the overflow -->
<item android:id="@+id/change_icon"
android:title="change icon"
/>
<item android:id="@+id/notifications"
android:title="set notification"
/>
</menu>
弹出菜单是根据活动而不是上下文创建的。因此,首先在适配器的构造函数中添加活动。您将把活动的上下文发送到super(),并将活动保存在私有字段变量中 公共类HostAdapter扩展了ArrayAdapter{ 私人活动;
公共主机适配器(Activity-Activity,int-num,ArrayList-allHost){
超级(activity.getApplicationContext(),0,allHost);
this.activity=activity;
} 没有