使用TreeMap數據膨脹ListView（自定義適配器）

Question

已解決：我已經根據@JJV的建議創建了一個適配器。我知道有很大的改進空間，但它現在起作用。 我已經使用工作代碼更新了我的程序的簡化版本;我希望這將是對他人有用：

MainActivity.java：

import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.ListAdapter; 
import android.widget.ListView; 

import java.util.Map; 
import java.util.TreeMap; 

public class MainActivity extends AppCompatActivity { 

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

     Map<Integer, Object> m = new TreeMap<Integer, Object>(); 

     int key = 123; 
     Item obj1 = new Item("abc", "xyz", 888); 
     m.put(key, obj1); 

     key = 456; 
     Item obj2 = new Item("def", "zyx", 999); 
     m.put(key, obj2); 

     ListAdapter adapter = new TreeMapAdapter(this, (TreeMap<Integer, Object>) m); 
     ListView itemListView = (ListView) findViewById(R.id.itemListView); 
     itemListView.setAdapter(adapter); 
    } 

    public class Item { 
     private String name; 
     private String thing; 
     private int number; 

     Item(String name, String thing, int number) { 
      this.name = name; 
      this.thing = thing; 
      this.number = number; 
     } 

     public String getName() { 
      return this.name; 
     } 

     public String getThing() { 
      return this.thing; 
     } 

     public int getNumber() { 
      return this.number; 
     } 
    } 
} 

main_activity.xml：

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

    <ListView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:id="@+id/itemListView" /> 
</LinearLayout> 

listview_row.xml：

<?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:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:id="@+id/name" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:id="@+id/thing" /> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:id="@+id/number" /> 
</LinearLayout> 

TreeMapAdapter.java：

import android.content.Context; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.TextView; 

import java.util.TreeMap; 


public class TreeMapAdapter extends ArrayAdapter<String> { 

    private Context context; 
    private TreeMap<Integer, Object> treeMap; 
    private Integer[] mapKeys; 

    public TreeMapAdapter(Context context, TreeMap<Integer, Object> data) { 
     super(context, R.layout.listview_row); 

     this.context = context; 
     this.treeMap = data; 
     mapKeys = treeMap.keySet().toArray(new Integer[getCount()]); 
    } 

    public int getCount() { 
     return treeMap.size(); 
    } 

    public String getItem(int position) { 
     return String.valueOf(treeMap.get(mapKeys[position])); 
    } 

    public long getItemId(int position) { 
     return mapKeys[position]; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     LayoutInflater deviceInflater = LayoutInflater.from(getContext()); 
     View listViewRow = deviceInflater.inflate(R.layout.listview_row, parent, false); 

     MainActivity.Item test = (MainActivity.Item) treeMap.get(mapKeys[position]); 

     String nameString = test.getName() + ", "; 
     String thingString = test.getThing() + ", "; 
     String numberInt = String.valueOf(test.getNumber()); 

     TextView name = (TextView) listViewRow.findViewById(R.id.name); 
     TextView thing = (TextView) listViewRow.findViewById(R.id.thing); 
     TextView number = (TextView) listViewRow.findViewById(R.id.number); 

     name.setText(nameString); 
     thing.setText(thingString); 
     number.setText(numberInt); 

     return listViewRow; 
    } 

} 

結果： 我不能嵌入結果的截圖在這個崗位，因爲我做沒有10的聲望，但你可以在這裏看到運行代碼的結果：http://i.stack.imgur.com/QoXX1.png

Answer 1

做這樣的事情：

public class TreeMapAdapter extends ArrayAdapter<String> { 
    private Context context 
    private TreeMap<Integer, Object> treeMap; 
    private int mapKeys[]; 
    public TreeMapAdapter(Context context,TreeMap<Integer, Object> treeMap) 
     this.context=context; 
     this.treeMao=treeMap; 
     mapKeys=treemap.keySet().toArray(); 
    } 

    public int getCount() { 
     return treeMap.size(); 
    } 

    public String getItem(int position) { 
     return treeMap.get(mapKeys[position]); 
    } 

    public long getItemId(int position) { 
     return mapKeys[position]; 
    } 
    //your getView method.... 
}