为不同的项目分配不同的（PNG）图标

Question

我知道有些人已经问过这个问题，但我找不到我想要的答案。如果有人能帮忙，会很感激。

想法：当我点击一个editText时，我想要一个listpopupWindow用不同的类别“下拉”来选择。这部分我想我可以管理。我无法管理的部分是为每个项目添加图标。

我有一个字符串数组，它包含不同的项目。 我怎么把它在我的片段类：

final String[] categories = getResources().getStringArray(R.array.categories); 

其中一个图标我有：

Drawable drawable_business = ResourcesCompat.getDrawable(getResources(),R.drawable.business,null); 

（我使用的API 15，这就是为什么它说： “ResourcesCompat ......”）

我试图用不同的方式解决它，每次我尝试使用像setIcon这样的东西，但它没有奏效。可绘制的insted的，我把它改成

ImageView image = (ImageView)view.findViewById(R.drawable.business); 

有一个setImageIcon，但作为一个参数，必须有一个图标？我不明白，请别人帮助..

此链接是一个我也跟着当我写我的代码 http://www.informit.com/articles/article.aspx?p=2078060&seqNum=4

Answer 1

您可以扩展ArrayAdapter并实现getView（），像这样：

公众类CustomAdapter如果我得到你的想法扩展ArrayAdapter {

public CustomAdapter(Context context, int resource,String[] strings) { 
    super(context, resource, strings);//the resource should be defined yourself 
} 

@NonNull 
@Override 
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { 
    ImageView imageView = convertView.findViewById(R.id.img); 
    imageView.setImageDrawable(getContext().getResources().getDrawable(R.drawable.ic_launcher)); 
    return convertView; 
} 

}

。

Answer 2

// use the Custom Autocomplete Text View to set Text and Image in dropdown 

// MainActivity.Java 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 

public class MainActivity extends Activity { 

    // Array of strings storing country names 
    String[] countries = new String[] { 
      "India", 
      "Pakistan", 
      "Sri Lanka", 
      "China", 
      "Bangladesh", 
      "Nepal", 
      "Afghanistan", 
      "North Korea", 
      "South Korea", 
      "Japan" 
    }; 

// Array of integers points to images stored in /res/drawable-ldpi/ 
    int[] flags = new int[]{ 
       R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher, 
     R.mipmap.ic_launcher 
    }; 

    // Array of strings to store currencies 
    String[] currency = new String[]{ 
     "Indian Rupee", 
     "Pakistani Rupee", 
     "Sri Lankan Rupee", 
     "Renminbi", 
     "Bangladeshi Taka", 
     "Nepalese Rupee", 
     "Afghani", 
     "North Korean Won", 
     "South Korean Won", 
     "Japanese Yen" 
    }; 




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


     // Each row in the list stores country name, currency and flag 
     List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>(); 

     for(int i=0;i<10;i++){ 
       HashMap<String, String> hm = new HashMap<String,String>(); 
      hm.put("txt", countries[i]); 
      hm.put("flag", Integer.toString(flags[i])); 
      hm.put("cur", currency[i]); 
      aList.add(hm); 
     } 

     // Keys used in Hashmap 
     String[] from = { "flag","txt"}; 

     // Ids of views in listview_layout 
     int[] to = { R.id.flag,R.id.txt}; 

     // Instantiating an adapter to store each items 
     // R.layout.listview_layout defines the layout of each item 
     SimpleAdapter adapter = new SimpleAdapter(getBaseContext(), aList, R.layout.autocomplete_layout, from, to); 

     // Getting a reference to CustomAutoCompleteTextView of activity_main.xml layout file 
     CustomAutoCompleteTextView autoComplete = (CustomAutoCompleteTextView) findViewById(R.id.autocomplete); 


     /** Defining an itemclick event listener for the autocompletetextview */ 
     OnItemClickListener itemClickListener = new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) { 
       /** Each item in the adapter is a HashMap object. 
       * So this statement creates the currently clicked hashmap object 
       * */ 
       HashMap<String, String> hm = (HashMap<String, String>) arg0.getAdapter().getItem(position); 

       /** Getting a reference to the TextView of the layout file activity_main to set Currency */ 
       TextView tvCurrency = (TextView) findViewById(R.id.tv_currency) ; 

       /** Getting currency from the HashMap and setting it to the textview */ 
       tvCurrency.setText("Currency : " + hm.get("cur")); 
      } 
     }; 

     /** Setting the itemclick event listener */ 
     autoComplete.setOnItemClickListener(itemClickListener); 

     /** Setting the adapter to the listView */ 
     autoComplete.setAdapter(adapter);   

    } 

    /** A callback method, which is executed when this activity is about to be killed 
    * This is used to save the current state of the activity 
    * (eg : Configuration changes : portrait -> landscape) 
    */ 
    @Override 
    protected void onSaveInstanceState(Bundle outState) { 
     TextView tvCurrency = (TextView) findViewById(R.id.tv_currency) ;  
     outState.putString("currency", tvCurrency.getText().toString()); 
     super.onSaveInstanceState(outState); 
    } 

    /** A callback method, which is executed when the activity is recreated 
    * (eg : Configuration changes : portrait -> landscape) 
    */ 
    @Override 
    protected void onRestoreInstanceState(Bundle savedInstanceState) { 
     TextView tvCurrency = (TextView) findViewById(R.id.tv_currency) ;  
     tvCurrency.setText(savedInstanceState.getString("currency")); 
     super.onRestoreInstanceState(savedInstanceState); 
    } 
} 



/// CustomAutoCompleteTextView.java 
import android.content.Context; 
import android.util.AttributeSet; 

import java.util.HashMap; 

/** Customizing AutoCompleteTextView to return Country Name 
* corresponding to the selected item 
*/ 
public class CustomAutoCompleteTextView extends android.support.v7.widget.AppCompatAutoCompleteTextView { 

    public CustomAutoCompleteTextView(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    /** Returns the country name corresponding to the selected item */ 
    @Override 
    protected CharSequence convertSelectionToString(Object selectedItem) { 
     /** Each item in the autocompetetextview suggestion list is a hashmap object */ 
     HashMap<String, String> hm = (HashMap<String, String>) selectedItem; 
     return hm.get("txt"); 
    } 
} 

//// 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" > 

    <com.demo.constraintlayout.CustomAutoCompleteTextView 
     android:id="@+id/autocomplete" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true" 
     android:textColor="@android:color/black" 
     android:hint="@string/str_hnt_autocomplete" 
     android:completionThreshold="1" 

     /> 

    <TextView 
     android:id="@+id/tv_currency" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_centerHorizontal="true"   
     android:layout_below="@id/autocomplete" 
     /> 

</RelativeLayout> 


///autocomplete_layout.xml 

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

    <ImageView 
      android:id="@+id/flag" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:contentDescription="@string/hello_world" 
      android:padding="10dp" 
    /> 

    <TextView 
      android:id="@+id/txt" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textSize="15dp" 
      android:padding="10dp"   
    /> 

</LinearLayout>