导航抽屉片段图标不显示

Question

我正在处理一个导航抽屉项目，并被困在片段图标中。 项目运行成功，但与该特定片段关联的图标没有显示，而是所有片段都有第一个的“主页”图标。 我真的坚持这一点。 下面的 PFA 屏幕图像和程序代码：

主活动.java

package com.navafatech.navdrawer;

//import android.app.FragmentManager;
//import android.app.Fragment;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
//import android.support.v4.app.FragmentActivity;
import android.support.v4.widget.DrawerLayout;
//import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.support.v7.widget.AppCompatTextView;
import android.support.v7.app.ActionBarDrawerToggle;

import java.util.ArrayList;

    public class MainActivity extends AppCompatActivity {
        private DrawerLayout mDrawerLayout;
        private ListView mDrawerList;
        private android.support.v7.app.ActionBarDrawerToggle mDrawerToggle;


        // nav drawer title
        private CharSequence mDrawerTitle;

        // used to store app title
        private CharSequence mTitle;


        // slide menu items
        private String[] navMenuTitles;
        private TypedArray navMenuIcons;

        private ArrayList<NavDrawerItem> navDrawerItems;
        private NavDrawerListAdapter adapter;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);


            mTitle = mDrawerTitle = getTitle();

            // load slide menu items
            navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);

            // nav drawer icons from resources
            navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);


            mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
            mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

            navDrawerItems = new ArrayList<NavDrawerItem>();

            // adding nav drawer items to array
            // Home
            navDrawerItems.add(new NavDrawerItem(navMenuTitles[0]));
            navMenuIcons.getResourceId(0,0);

            // Find People
            navDrawerItems.add(new NavDrawerItem(navMenuTitles[1]));
            // Photos
            navDrawerItems.add(new NavDrawerItem(navMenuTitles[2]));
            // Communities, Will add a counter here
            navDrawerItems.add(new NavDrawerItem(navMenuTitles[3]));
            // Pages
            navDrawerItems.add(new NavDrawerItem(navMenuTitles[4]));
            // What's hot, We  will add a counter here
            navDrawerItems.add(new NavDrawerItem(navMenuTitles[5]));


            // Recycle the typed array
            navMenuIcons.recycle();

            mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

            // setting the nav drawer list adapter
            adapter = new NavDrawerListAdapter(getApplicationContext(),
                    navDrawerItems);
            mDrawerList.setAdapter(adapter);

            // enabling action bar app icon and behaving it as toggle button
            assert getSupportActionBar()!=null;
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            getSupportActionBar().setHomeButtonEnabled(true);



            mDrawerToggle = new ActionBarDrawerToggle (this, mDrawerLayout,
                   // R.drawable.ic_drawer, //nav menu toggle icon
                    R.string.app_name, // nav drawer open - description for accessibility
                    R.string.app_name // nav drawer close - description for accessibility
            ) {
                public void onDrawerClosed(View view) {
                    getSupportActionBar().setTitle(mTitle);
                    // calling onPrepareOptionsMenu() to show action bar icons
                    invalidateOptionsMenu();
                }

                public void onDrawerOpened(View drawerView) {
                    getSupportActionBar().setTitle(mDrawerTitle);
                    // calling onPrepareOptionsMenu() to hide action bar icons
                    invalidateOptionsMenu();
                }
            };
            mDrawerLayout.setDrawerListener(mDrawerToggle);

            if (savedInstanceState == null) {
                // on first time display view for first nav item
                displayView(0);
            }
        }

        /**
         * Slide menu item click listener
         */
        private class SlideMenuClickListener implements
                ListView.OnItemClickListener {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position,
                                    long id) {
                // display view for selected nav drawer item
                displayView(position);
            }
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            getMenuInflater().inflate(R.menu.menu_main, menu);
            return true;
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // toggle nav drawer on selecting action bar app icon/title
            if (mDrawerToggle.onOptionsItemSelected(item)) {
                return true;
            }
            // Handle action bar actions click
            switch (item.getItemId()) {
                case R.id.action_settings:
                    return true;
                default:
                    return super.onOptionsItemSelected(item);
            }
        }

        @Override
        protected void onPostCreate(Bundle savedInstanceState) {
            super.onPostCreate(savedInstanceState);
            // Sync the toggle state after onRestoreInstanceState has occurred.
            mDrawerToggle.syncState();
        }

        @Override
        public void onConfigurationChanged(Configuration newConfig) {
            super.onConfigurationChanged(newConfig);
            mDrawerToggle.onConfigurationChanged(newConfig);
        }

        /***
         * Called when invalidateOptionsMenu() is triggered
         */
        @Override
        public boolean onPrepareOptionsMenu(Menu menu) {
            // if nav drawer is opened, hide the action items
            boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
            menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
            return super.onPrepareOptionsMenu(menu);
        }

        /**
         * Diplaying fragment view for selected nav drawer list item
         */
        private void displayView(int position) {
            // update the main content by replacing fragments
            Fragment fragment = null;
            switch (position) {
                case 0:
                    fragment = new HomeFragment();
                    break;
                case 1:
                    fragment = new FindPeopleFragment();
                    break;
                case 2:
                    fragment = new PhotosFragment();
                    break;
                case 3:
                    fragment = new CommunityFragment();
                    break;
                case 4:
                    fragment = new PagesFragment();
                    break;
                case 5:
                    fragment = new WhatsHotFragment();
                    break;

                default:
                    break;
            }

            if (fragment != null) {
                android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
                fragmentManager.beginTransaction()
                        .replace(R.id.frame_container, fragment).commit();

                // update selected item and title, then close the drawer
                mDrawerList.setItemChecked(position, true);
                mDrawerList.setSelection(position);
                setTitle(navMenuTitles[position]);
                mDrawerLayout.closeDrawer(mDrawerList);
            } else {
                // error in creating fragment
                Log.e("MainActivity", "Error in creating fragment");
            }
        }
    }

导航抽屉项.java

package com.navafatech.navdrawer;

import android.support.v7.app.AppCompatActivity;

/**
 * Created by navin on 04-11-2015.
 */
public class NavDrawerItem  {
    private  String title;
    private int icon;
    private String count = "0";
    // boolean to set visiblity of the counter
    private boolean isCounterVisible = false;

    public NavDrawerItem (){}

    public NavDrawerItem(String title) {
        this.title = title;
        this.icon = icon;
    }

    public NavDrawerItem(String title, int icon, boolean isCounterVisible, String count){
        this.title = title;
        this.icon = icon;
        this.isCounterVisible = isCounterVisible;
        this.count = count;
    }

    public String getTitle() {
        return this.title;
    }

   public int getIcon() {
      return  this.icon;
}

    public String getCount(){
        return this.count;
    }

    public boolean getCounterVisibility(){
        return this.isCounterVisible;
    }

    public void setTitle(String title){
        this.title = title;
    }

    public void setIcon(int icon){
        this.icon = icon;
    }

    public void setCount(String count){
        this.count = count;
    }

    public void setCounterVisibility(boolean isCounterVisible){
        this.isCounterVisible = isCounterVisible;
    }
}

NavDrawerListAdapter.java

package com.navafatech.navdrawer;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;


public class NavDrawerListAdapter extends BaseAdapter {

    private Context context;
    private ArrayList<NavDrawerItem> navDrawerItems;

    public  NavDrawerListAdapter(Context context,ArrayList<NavDrawerItem> navDrawerItems) {
        this.context = context;
        this.navDrawerItems = navDrawerItems;
    }

    @Override
    public int getCount(){
        return  navDrawerItems.size();
    }

    @Override
    public Object getItem(int position) {
        return navDrawerItems.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position,View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater)
                    context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.drawer_list_item, null);
        }

        ImageView imgIcon = (ImageView) convertView.findViewById(R.id.icon);
        TextView txtTitle = (TextView) convertView.findViewById(R.id.title);
        TextView txtCount = (TextView) convertView.findViewById(R.id.counter);

       //    imgIcon.setImageResource(navDrawerItems.get(position).getIcon());
        txtTitle.setText(navDrawerItems.get(position).getTitle());

        // displaying count
        // check whether it set visible or not
        if(navDrawerItems.get(position).getCounterVisibility()){
            txtCount.setText(navDrawerItems.get(position).getCount());
        }else{
            // hide the counter view
            txtCount.setVisibility(View.GONE);
        }

        return convertView;
    }

}

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".MainActivity">


    <!--  <android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
          android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay">

          <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
              android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
              android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />

      </android.support.design.widget.AppBarLayout>

      <include layout="@layout/content_main" />

      <android.support.design.widget.FloatingActionButton android:id="@+id/fab"
          android:layout_width="wrap_content" android:layout_height="wrap_content"
          android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin"
          android:src="@android:drawable/ic_dialog_email" />-->

    <!-- Framelayout to display Fragments -->
    <FrameLayout
        android:id="@+id/frame_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!-- Listview to display slider menu -->
    <ListView
        android:id="@+id/list_slidermenu"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:divider="#000000"
        android:dividerHeight="1dp"
        android:listSelector="@drawable/list_selector"
        android:background="#b0c4de"/>

</android.support.v4.widget.DrawerLayout>

drawer_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="48dp"
    android:background="@drawable/list_selector">

    <ImageView
        android:id="@+id/icon"
        android:layout_width="25dp"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="12dp"
        android:layout_marginRight="12dp"
        android:contentDescription="@string/desc_list_item_icon"
        android:src="@drawable/ic_home"
        android:layout_centerVertical="true" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_toRightOf="@id/icon"
        android:layout_toEndOf="@id/icon"
        android:textColor="#0889d8"
        android:gravity="center_vertical"
        android:paddingRight="40dp"
        android:paddingEnd="40dp"/>

    <TextView android:id="@+id/counter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/counter_bg"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="8dp"
        android:textColor="#001905"/>

</RelativeLayout>

字符串.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Slider Menu</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="drawer_open">Slider Menu Opened</string>
    <string name="drawer_close">Slider Menu Closed</string>

    <!-- Nav Drawer Menu Items -->
    <string-array name="nav_drawer_items">
        <item >Home</item>
        <item >Find People</item>
        <item >Photos</item>
        <item >Communities</item>
        <item >Pages</item>
        <item >What\'s Hot</item>
    </string-array>

    <!-- Nav Drawer List Item Icons -->
    <!-- Keep them in order as the titles are in -->
    <string-array name="nav_drawer_icons">
        <item>@drawable/ic_home</item>
        <item>@drawable/ic_people</item>
        <item>@drawable/ic_photos</item>
        <item>@drawable/ic_communities</item>
        <item>@drawable/ic_pages</item>
        <item>@drawable/ic_whats_hot</item>
    </string-array>

    <!-- Content Description -->
    <string name="desc_list_item_icon">Item Icon</string>

</resources>

Answer 1

首先，您需要将图标数组添加到您的 navDrawerItems。

主活动.java

// adding nav drawer items to array
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));

NavDrawerListAdapter.java

接下来，您需要在适配器中设置图像资源：

imgIcon.setImageResource(navDrawerItems.get(position).getIcon());

MainActivity.java的OnCreate()最终代码：

.....
navDrawerItems = new ArrayList<NavDrawerItem>();

// adding nav drawer items to array
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1)));

// Recycle the typed array
navMenuIcons.recycle();
....

NavDrawerListAdapter.java的getView()最终代码：

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {
       LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = mInflater.inflate(R.layout.drawer_list_item, null);
        }

        ImageView imgIcon = (ImageView) convertView.findViewById(R.id.icon);
        TextView txtTitle = (TextView) convertView.findViewById(R.id.title);
        ......

        imgIcon.setImageResource(navDrawerItems.get(position).getIcon());
        txtTitle.setText(navDrawerItems.get(position).getTitle());

        return convertView;
    }

Answer 2

我无法确切地看到您是如何更新图标的。 但我是这样做的，您需要在抽屉列表适配器中创建一个 int 图标数组，然后使用位置值将图标简单地放置在该位置。

例如。 imgView.setImageResource(iconArray[位置]);

而你的 int iconArray[] = {R.icon1, R.icon2, .....}