Question

我编写了一个CustomAdapter来显示散列键+值项列表作为列表。但我被困在下面这一行。

label.setText（my_VALUES [0]）

第二类是我的CustomAdapter，我将它传递给hashMap

public MyCustomAdapter(DynamicLists dynamicLists, int row, HashMap<String,String> data)

这里我组合了键+值对，并将它们分配给一个名为my_VALUES的数组。但我不知道这是否正确？

如何在getview中打印出每个KEY + VALUE对作为单独的项目。目前我只能使用label.setText（my_VALUES [0]）

由于

格雷厄姆包gb.org;

//lists are not checkboxes 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;


//class 1 
public class DynamicLists extends ListActivity { 



//class 2 
public class MyCustomAdapter extends BaseAdapter { 
    private HashMap<String,String> mData = new HashMap<String,String>();
    private String[] mKeys;
    String[] my_VALUES = new String[100];



    public MyCustomAdapter(DynamicLists dynamicLists, int row, HashMap<String,String> data){ 
    mData = data;
    mKeys = mData.keySet().toArray(new String[data.size()]);
    Log.d(TAG, "INSIDE ADAPTER HELLO WORLD " + map.entrySet()); 


    String[] array = new String[map.size()];
    int count = 0;
    String combined="";
    for(Map.Entry<String, String> entry : map.entrySet()){
        combined="A"+entry.getKey()+"B"+entry.getValue();

    my_VALUES[count]=combined;
    Log.d(TAG, " my_VALUES " + my_VALUES);
    count++;


    }


}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
    String key = mKeys[position];
    String Value = getItem(position).toString();

    //do your view stuff here
    Log.d(TAG, "inside getview  ");
    View row=convertView;

if (row==null){
    LayoutInflater inflater=getLayoutInflater();
    row=inflater.inflate(R.layout.row, null);
}

TextView label =(TextView)row.findViewById(R.id.blocked);
label.setText(my_VALUES[0]);  //printing out the last value 

return row;   

}
@Override
public int getCount() {

    // TODO Auto-generated method stub
    return mData.size();
}
@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return mData.get(mKeys[position]);
}
@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}


}  //end of class 2 



private static final String TAG = "Example";


//class 1 


public static  HashMap<String, String> map = new HashMap<String, String>(); 

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   //tie data to list, call constructor MyCustomAdapter 
   //populate the list. ArrayAdapter takes current class, layout and array
   map.put("year", "Apple");    
   map.put("make", "Mango");     
   map.put("model", "Grape");    
   map.put("style", "Orange");     
   map.put("series", "Peach"); 
   Log.d(TAG, "HELLO WORLD " + map.entrySet());    
   //link to my adapter
   setListAdapter(new MyCustomAdapter(DynamicLists.this, R.layout.row, map));

}


@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
//super.onListItemClick(l, v, position, id);
String selection = l.getItemAtPosition(position).toString();
Toast.makeText(this, selection, Toast.LENGTH_LONG).show();


}


} //end of class 1

Answer 1

看看这是否有效。

我只改变了两件事： 1）如何实例化my_VALUES 2）label.setText（my_VALUES [position]）;

public class DynamicLists extends ListActivity { 



//class 2 
public class MyCustomAdapter extends BaseAdapter { 
    private HashMap<String,String> mData = new HashMap<String,String>();
    private String[] mKeys;
    String[] my_VALUES;


    public MyCustomAdapter(DynamicLists dynamicLists, int row, HashMap<String,String> data){ 
    mData = data;

    my_VALUES = new String[mData.size()];


    mKeys = mData.keySet().toArray(new String[data.size()]);
    Log.d(TAG, "INSIDE ADAPTER HELLO WORLD " + map.entrySet()); 


    String[] array = new String[map.size()];
    int count = 0;
    String combined="";
    for(Map.Entry<String, String> entry : map.entrySet()){
        combined="A"+entry.getKey()+"B"+entry.getValue();

    my_VALUES[count]=combined;
    Log.d(TAG, " my_VALUES " + my_VALUES);
    count++;


    }


}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
    String key = mKeys[position];
    String Value = getItem(position).toString();

    //do your view stuff here
    Log.d(TAG, "inside getview  ");
    View row=convertView;

if (row==null){
    LayoutInflater inflater=getLayoutInflater();
    row=inflater.inflate(R.layout.row, null);
}

TextView label =(TextView)row.findViewById(R.id.blocked);
label.setText(my_VALUES[position]);  //printing out the last value 

return row;   

}
@Override
public int getCount() {

    // TODO Auto-generated method stub
    return mData.size();
}
@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return mData.get(mKeys[position]);
}
@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}


}  //end of class 2 



private static final String TAG = "Example";


//class 1 


public static  HashMap<String, String> map = new HashMap<String, String>(); 

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   //tie data to list, call constructor MyCustomAdapter 
   //populate the list. ArrayAdapter takes current class, layout and array
   map.put("year", "Apple");    
   map.put("make", "Mango");     
   map.put("model", "Grape");    
   map.put("style", "Orange");     
   map.put("series", "Peach"); 
   Log.d(TAG, "HELLO WORLD " + map.entrySet());    
   //link to my adapter
   setListAdapter(new MyCustomAdapter(DynamicLists.this, R.layout.row, map));

}


@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
//super.onListItemClick(l, v, position, id);
String selection = l.getItemAtPosition(position).toString();
Toast.makeText(this, selection, Toast.LENGTH_LONG).show();


}


} //end of class 1

Answer 2

你在java中只做label.setText（mKeys [position] + getItem（position）.toString（））;

customAdapter如何在getview的TextView.setText（）中打印出数组的内容

2 个答案: