我在Listview中挣扎，如何在此Listview中添加两个值，我正在使用SimpleAdapter但我不能添加两个值，Listview仅显示数据库中的一项，如何从中添加两个值mysql database。如何添加两个值？
//这是我的布局文件
//主要活动
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="0dp">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="New Class :"
android:textSize="17dp"
android:fontFamily="serif"
android:textColor="#000"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_weight="1"/>
<Spinner
android:id="@+id/new_class"
style="@style/Platform.Widget.AppCompat.Spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_weight="1"
android:background="@drawable/spinner_background"
android:popupBackground="#fff"
android:fontFamily="serif"
android:layout_marginRight="10dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/listView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:choiceMode="multipleChoice"
android:focusable="false"/>
</LinearLayout>
</LinearLayout>
//这是我用于自定义布局的行活动文件
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/thumbImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="sample text"
android:layout_weight="1"
android:textAppearance="?android:attr/textAppearanceMedium" />
<CheckedTextView
android:id="@+id/itemCheckBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:checkMark="?android:attr/listChoiceIndicatorMultiple"
android:focusable="false"
android:focusableInTouchMode="false"/>
</LinearLayout>
</RelativeLayout>
//这是我的代码
listview.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
sparseBooleanArray = listview.getCheckedItemPositions();
String ValueHolder = "" ;
int i = 0 ;
while (i < sparseBooleanArray.size()) {
if (sparseBooleanArray.valueAt(i)) {
ValueHolder += data4.get(sparseBooleanArray.keyAt(i)) + ",";
}
i++ ;
}
ValueHolder = ValueHolder.replaceAll("(,)*$", "");
Toast.makeText(MainActivity.this, ValueHolder, Toast.LENGTH_LONG).show();
}
});
如何创建自定义阵列适配器，请帮助我
最佳答案
只需使用自定义阵列适配器，如下所示
这是我的适配器类
public class ItemAdapter extends ArrayAdapter<User> {
// declaring our ArrayList of items
private ArrayList<User> objects;
/* here we must override the constructor for ArrayAdapter
* the only variable we care about now is ArrayList<User> objects,
* because it is the list of objects we want to display.
*/
public ItemAdapter(Context context, int textViewResourceId, ArrayList<User> objects) {
super(context, textViewResourceId, objects);
this.objects = objects;
}
/*
* we are overriding the getView method here - this is what defines how each
* list item will look.
*/
public View getView(int position, View convertView, ViewGroup parent){
// assign the view we are converting to a local variable
View v = convertView;
// first check to see if the view is null. if so, we have to inflate it.
// to inflate it basically means to render, or show, the view.
if (v == null) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = inflater.inflate(R.layout.list_item, null);
}
/*
* Recall that the variable position is sent in as an argument to this method.
* The variable simply refers to the position of the current object in the list. (The ArrayAdapter
* iterates through the list we sent it)
*
* Therefore, i refers to the current User object.
*/
User i = objects.get(position);
if (i != null) {
// This is how you obtain a reference to the TextViews.
// These TextViews are created in the XML files we defined.
TextView tt = (TextView) v.findViewById(R.id.toptext);
TextView ttd = (TextView) v.findViewById(R.id.toptextdata);
TextView mt = (TextView) v.findViewById(R.id.middletext);
TextView mtd = (TextView) v.findViewById(R.id.middletextdata);
TextView bt = (TextView) v.findViewById(R.id.bottomtext);
TextView btd = (TextView) v.findViewById(R.id.desctext);
// check to see if each individual textview is null.
// if not, assign some text!
if (tt != null){
tt.setText("Name: ");
}
if (ttd != null){
ttd.setText(i.getName());
}
if (mt != null){
mt.setText("Price: ");
}
if (mtd != null){
mtd.setText("$" + i.getPrice());
}
if (bt != null){
bt.setText("Details: ");
}
if (btd != null){
btd.setText(i.getDetails());
}
}
// the view must be returned to our activity
return v;
}
}
像这样在列表视图中设置自定义适配器的实例
ItemAdapter itemAdapter = new ItemAdapter(...);
listView.setAdapter(itemAdapter)
如果有帮助，请验证答案