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Java 如何在我的Android图像抽屉中获取图标？

java android xml

Java 如何在我的Android图像抽屉中获取图标？,java,android,xml,icons,navigation-drawer,Java,Android,Xml,Icons,Navigation Drawer,我刚刚在Android应用程序中创建了一个抽屉，现在我想在每个菜单项旁边添加图标。为此，我创建了一个list\u item\u drawer.xml文件，如下所示： <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" a

我刚刚在Android应用程序中创建了一个抽屉，现在我想在每个菜单项旁边添加图标。为此，我创建了一个list\u item\u drawer.xml文件，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/text_drawer_menu_item"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="23dp"
        android:text="Menu item"
        />

    <ImageView
        android:id="@+id/image_drawermenu_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:src="@drawable/placeholder"/>

</LinearLayout>
然后我在MainActivity中调用此文件，如下所示：

final String[] menuEntries = {"Overview","New Payment"};
final String[] fragments = {
        "com.mycompany.fragment.OverviewFragment",
        "com.mycompany.fragment.DetailsFragment",
};
private ActionBarDrawerToggle drawerToggle;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.drawer_root);
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_item_drawer, R.id.text_drawer_menu_item, menuEntries);

    etc..

final String[]menuEntries={“概述”，“新付款”}；
最终字符串[]片段={
“com.mycompany.fragment.OverviewFragment”，
“com.mycompany.fragment.DetailsFragment”，
};
私人诉讼律师事务所；
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.drawer\u root）；
ArrayAdapter=新的ArrayAdapter（此，R.layout.list\u item\u drawer，R.id.text\u drawer\u menu\u item，Menutries）；
等
奇怪的是，尽管现在每个菜单项都有占位符图像文件的高度，但我看不到显示的图像文件。因此，我的第一个问题是：如何显示图像文件？

但即使显示了该图像文件，我想知道（问题二），如何为每个菜单项设置唯一的图标？

欢迎使用所有提示！

默认情况下，ArrayAdapter在提供的视图中查找文本视图并仅更新文本。若要更新视图中的图像，您需要扩展ArrayAdapter并使用以下内容覆盖getView（）：

@Override
public View getView(int position, View convertView, ViewGroup parent) {
  LayoutInflater inflater = (LayoutInflater) context
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  View rowView = inflater.inflate(R.layout.rowlayout, parent, false);
  TextView textView = (TextView) rowView.findViewById(R.id.label);
  ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
  textView.setText(values[position]);
  // Change the icon for Windows and iPhone
  String s = values[position];
  if (s.startsWith("Windows7") || s.startsWith("iPhone")
      || s.startsWith("Solaris")) {
    imageView.setImageResource(R.drawable.no);
  } else {
    imageView.setImageResource(R.drawable.ok);
  }

  return rowView;
}
资料来源：

您可以使用自定义列表视图和列表适配器来显示抽屉中列表项之外的图标。然后向主抽屉类添加所需的任何代码。 以下是我在支持导航抽屉的android应用程序中实现的代码，其中包含图标、标题、标签和计数器：

抽屉的getter/setter方法类：

package info.aea.drawer;

public class NavDrawerItem {

    private String title;
    private String tag;
    private int icon;
    private String count = "0";
    // boolean to set visibility of the counter
    private boolean isCounterVisible = false;

    public NavDrawerItem(){}

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

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

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

    public String getTag(){
        return this.tag;
    }

    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 setTag(String tag){
        this.tag = tag;
    }

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

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

    public void setCounterVisibility(boolean isCounterVisible){
        this.isCounterVisible = isCounterVisible;
    }
}
这是我用来显示列表的列表适配器。最后检查显示计数方法：

package info.aea.drawer;

import info.aea.snippets.R;

import java.util.ArrayList;

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;

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 txtTag = (TextView) convertView.findViewById(R.id.tag);
        TextView txtCount = (TextView) convertView.findViewById(R.id.counter);

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

        // 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;
    }

}

package info.aea.drawer；
导入info.aea.snippets.R；
导入java.util.ArrayList；
导入android.app.Activity；
导入android.content.Context；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.BaseAdapter；
导入android.widget.ImageView；
导入android.widget.TextView；
公共类NavDrawerListAdapter扩展了BaseAdapter{
私人语境；
私人ArrayList NavWrites；
公共NavDrawerListAdapter（上下文上下文，ArrayList navDrawerItems）{
this.context=上下文；
this.navDrawerItems=navDrawerItems；
}
@凌驾
public int getCount（）{
返回navDrawerItems.size（）；
}
@凌驾
公共对象getItem（int位置）{
返回NAVS.get（位置）；
}
@凌驾
公共长getItemId（int位置）{
返回位置；
}
@凌驾
公共视图getView（int位置、视图转换视图、视图组父视图）{
if（convertView==null）{
LayoutInflater mInflater=（LayoutInflater）
context.getSystemService（Activity.LAYOUT\u INFLATER\u SERVICE）；
convertView=mInflater.充气（R.layout.drawer\u list\u项，空）；
}
ImageView imgIcon=（ImageView）convertView.findViewById（R.id.icon）；
TextView txtTitle=（TextView）convertView.findViewById（R.id.title）；
TextView txtTag=（TextView）convertView.findViewById（R.id.tag）；
TextView txtCount=（TextView）convertView.findViewById（R.id.counter）；
setImageResource（navDrawerItems.get（position.getIcon（））；
setText（navDrawerItems.get（position.getTitle（））；
setText（navDrawerItems.get（position.getTag（））；
//显示计数
//检查设置是否可见
if（navDrawerItems.get（position.getCounterVisibility（））{
setText（navDrawerItems.get（position.getCount（））；
}否则{
//隐藏计数器视图
txtCount.setVisibility（View.GONE）；
}
返回视图；
}
}
对应的列表布局：

<?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="match_parent" 
    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_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:minHeight="?android:attr/listPreferredItemHeightSmall"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        android:textColor="@color/list_item_title"
        android:textStyle="bold"
        android:gravity="center_vertical"
        android:paddingRight="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="@color/counter_text_color"/>

    <TextView
        android:id="@+id/tag"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/icon"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="12dp"
        android:textColor="#999967"
        android:textSize="13sp"
        android:textStyle="italic"
        android:text="sample" />

</RelativeLayout>
这是N-drawer的主要类别：

package info.aea.launch;


import info.aea.drawer.NavDrawerItem;
import info.aea.drawer.NavDrawerListAdapter;
import info.aea.snippets.R;

import java.util.ArrayList;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
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.widget.Toast;

public class LaunchActivity_NavDrawer extends Activity {




    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

    // nav drawer title
    private CharSequence mDrawerTitle;

    // used to store app title
    private CharSequence mTitle;

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

    private ArrayList<NavDrawerItem> navDrawerItems;
    private NavDrawerListAdapter adapter;

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


        SnippetsDB_Helper logindb;
        logindb=new SnippetsDB_Helper(this);
        //logindb=logindb.open();




        mTitle = mDrawerTitle = getTitle();

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

        // load slide menu tags
        navMenuTags = getResources().getStringArray(R.array.nav_drawer_tags);

        // 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], navMenuTags[0], navMenuIcons.getResourceId(0, -1), true, "22" ));
        // Find People
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuTags[1], navMenuIcons.getResourceId(1, -1)));
        // Photos
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuTags[2], navMenuIcons.getResourceId(2, -1)));
        // Communities, Will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuTags[3],  navMenuIcons.getResourceId(3, -1), true, "22"));
        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuTags[4], navMenuIcons.getResourceId(4, -1)));
        // What's hot, We  will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuTags[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
        // Find People
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuTags[6], navMenuIcons.getResourceId(6, -1)));
        // Communities, Will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[7], navMenuTags[7], navMenuIcons.getResourceId(7, -1), true, "22"));

        // empty list
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[8], navMenuTags[8], navMenuIcons.getResourceId(8, -1)));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[9], navMenuTags[9], navMenuIcons.getResourceId(9, -1)));
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[10], navMenuTags[10], navMenuIcons.getResourceId(10, -1)));

        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[11], navMenuTags[11], navMenuIcons.getResourceId(11, -1)));

        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[12], navMenuTags[12], navMenuIcons.getResourceId(12, -1)));

        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[13], navMenuTags[13], navMenuIcons.getResourceId(13, -1)));

        navDrawerItems.add(new NavDrawerItem(navMenuTitles[14], navMenuTags[14], navMenuIcons.getResourceId(14, -1)));

        navDrawerItems.add(new NavDrawerItem(navMenuTitles[15], navMenuTags[15], navMenuIcons.getResourceId(15, -1)));





        // 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
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().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) {
                getActionBar().setTitle(mTitle);
                // calling onPrepareOptionsMenu() to show action bar icons
                invalidateOptionsMenu();
            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().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.main_menu, 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:
            Toast.makeText(getApplicationContext(), "code", Toast.LENGTH_LONG).show();
            // Create new fragment and transaction
            Fragment newFragment = new Fragment_Java(); 
            // consider using Java coding conventions (upper char class names!!!)
            FragmentTransaction transaction = getFragmentManager().beginTransaction();

            // Replace whatever is in the fragment_container view with this fragment,
            // and add the transaction to the back stack
            transaction.replace(R.id.frame_container, newFragment);
            transaction.addToBackStack(null);
            // Commit the transaction
            transaction.commit(); 
            return true;

        case R.id.item1:
            Toast.makeText(getApplicationContext(), "send a suggestion", Toast.LENGTH_LONG).show();
            return true;

        case R.id.item2:
            Toast.makeText(getApplicationContext(), "Meet developers", Toast.LENGTH_LONG).show();
            return true;

        case R.id.item3:
            Toast.makeText(getApplicationContext(), "Rate this app", Toast.LENGTH_LONG).show();
            return true;

        default:
            return super.onOptionsItemSelected(item);
        }
    }

    /* 
     * 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 Fragment_a();
            break;
        case 1:
            fragment = new Fragment_b();
            break;
        case 2:
            fragment = new Fragment_C();
            break;   
        default:
            break;
        }

        if (fragment != null) {
            FragmentManager fragmentManager = getFragmentManager();
            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");
        }
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getActionBar().setTitle(mTitle);
    }

    /**
     * When using the ActionBarDrawerToggle, you must call it during
     * onPostCreate() and onConfigurationChanged()...
     */

    @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);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }


    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent result) {
       super.onActivityResult(requestCode, resultCode, result);
    }
}

package info.aea.launch；
导入info.aea.drawer.NavDrawerItem；
导入info.aea.drawer.navdrawerlistatadapter；
导入info.aea.snippets.R；
导入java.util.ArrayList；
导入android.app.Activity；
导入android.app.Fragment；
导入android.app.FragmentManager；
导入android.app.FragmentTransaction；
导入android.content.Intent；
导入android.content.res.Configuration；
导入android.content.res.TypedArray；
导入android.os.Bundle；
导入android.support.v4.app.ActionBarDrawerToggle；
导入android.support.v4.widget.DrawerLayout；
导入android.util.Log；
导入android.view.Menu；
导入android.view.MenuItem；
导入android.view.view；
导入android.widget.AdapterView；
导入android.widget.ListView；
导入android.widget.Toast；
公共类启动活动\u NavDrawer扩展活动{
私人抽屉布局mDrawerLayout；
私有列表视图mDrawerList；
私有操作bardrawertoggle mDrawerToggle；
//导航抽屉标题
私有字符序列mDrawerTitle；
//用于存储应用程序标题
私有字符序列mTitle；
//幻灯片菜单项
私有字符串[]navMenuTitles；
私有字符串[]navMenuTags；；
专用型雷达导航仪；
私人ArrayList NavWrites；
专用导航适配器；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
SnippetsDB_Helper logindb；
logindb=新代码段SDB\U帮助程序（此）；
//logindb=logindb.open（）；
mTitle=mDrawerTitle=getTitle（）；
//加载幻灯片菜单项
navMenuTitles=getResources（）.getStringArray（R.array.nav\u抽屉\u项目）；
//加载幻灯片菜单标签
navMenuTags=getResources（）.getStringArray（R.array.nav\u抽屉\u标记