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我有一個圖像視圖作爲數組adpater/listview的一部分。 imageView是列表視圖中每個項目左側的設置圖標。當用戶點擊圖像時，出現一個彈出式菜單。但到目前爲止，我無法顯示菜單。我推動了一個setOnClickListener的形象，但仍然沒有去。有人能告訴我我在這裏做錯了什麼。彈出式菜單實施是在適配器還是活動中完成的？到目前爲止，我已經嘗試了兩種方法，但都無效。由於 mainActivity彈出菜單不工作arrayAdapter listview
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);
}
}
適配器
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();
}
}
列表項的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>
主要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>
菜單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>