Question

我正在尝试动态添加SELECT * FROM `locate` ORDER BY STR_TO_DATE(`Date`,'%Y-%m-%d') DESC中的项目但是当我使用自定义适配器时，只有数组的最后一个元素与ListView绑定。

ListView

这是我调用自定义适配器类的代码，我的数组大小为5，并且在自定义适配器构造函数中，我正确地获得了值，但public class CustomAdapterForChat extends BaseAdapter { Context context; ArrayList<String> message; LayoutInflater inflter; public CustomAdapterForChat(Context applicationContext, ArrayList<String> message) {//, int[] images,String[] statuses,String[] PhoneNumbers this.message=message; inflter = (LayoutInflater.from(applicationContext)); } @Override public int getCount() { return message.size(); } @Override public Object getItem(int i) { return i; } @Override public long getItemId(int i) { return i; } @Override public View getView(int i, View view, ViewGroup viewGroup) { view = inflter.inflate(R.layout.senderlayout, null); TextView SenderMesssage=(TextView)view.findViewById(R.id.SenderMesssage); TextView time=(TextView)view.findViewById(R.id.timeOfmessage); SenderMesssage.setText(message.get(i)); DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); Date date = new Date(); time.setText(date.toString()); return view; } }方法getView正在进行i仅

ListView.xml

public class ChatPage extends ListActivity {

     String listItem[]={"Dell Inspiron", "HTC One X", "HTC Wildfire S", 
                        "HTC Sense", "HTC Sensation XE"};
     EditText et;
     List<String> arrayList;
     ImageView button;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_chat_page);
         et = (EditText) findViewById(R.id.writemessage);
         ArrayList values = new ArrayList();
         for (int i = 0; i < listItem.length; i++) {
             values.add(listItem[i]);
         }
         CustomAdapterForChat adapter = new CustomAdapterForChat(this,values);
         setListAdapter(adapter);
     }

     public void onClick(View view) {
          CustomAdapterForChat adapter = (CustomAdapterForChat) getListAdapter();
          String device;
          ArrayList myList = new ArrayList();
          for (int i=0;i<adapter.getCount();i++)
          {
              myList.add(adapter.getItem(i));
          }
          myList.add(et.getText().toString());
          CustomAdapterForChat adapternew = new CustomAdapterForChat(this,myList);
          setListAdapter(adapternew);

      }

 }

Sender.XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="tahatechno.tahatechno.ChatPage">
<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical"
    >

    <ScrollView
        android:layout_width="match_parent"
        android:layout_weight="20"
        android:layout_height="wrap_content">

        <ListView
        android:id="@id/android:list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:stackFromBottom="true">


        </ListView>
    </ScrollView>



    <include
        layout="@layout/type_message_area"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="bottom"
        />
 </LinearLayout>
 </android.support.constraint.ConstraintLayout>

Answer 1

你的循环错了。每次运行循环时，都会在列表中插入相同的项目。创建要在列表中插入的对象的单个实例。或者粘贴循环代码

在Android中的listView中只显示一次最后一个数组项

1 个答案: