Java 单击时,Listview会选择多个项目
我想成为一名任务经理,但我只有一个问题。我有一个膨胀的列表视图。listview中的所有元素都是正确的。问题是,当我选择一个项目时,listview会选择另一个项目。我听说ListView会在列表向下滚动时重新填充列表以节省内存。我认为这可能是某种问题。这是一张照片。 如果我加载了更多的应用程序,那么它将继续一次选择多个 下面是我的适配器、活动和相关XML的代码Java 单击时,Listview会选择多个项目,java,android,listview,android-listview,Java,Android,Listview,Android Listview,我想成为一名任务经理,但我只有一个问题。我有一个膨胀的列表视图。listview中的所有元素都是正确的。问题是,当我选择一个项目时,listview会选择另一个项目。我听说ListView会在列表向下滚动时重新填充列表以节省内存。我认为这可能是某种问题。这是一张照片。 如果我加载了更多的应用程序,那么它将继续一次选择多个 下面是我的适配器、活动和相关XML的代码 public class TaskAdapter extends BaseAdapter{ private Context mCont
public class TaskAdapter extends BaseAdapter{
private Context mContext;
private List<TaskInfo> mListAppInfo;
private PackageManager mPack;
public TaskAdapter(Context c, List<TaskInfo> list, PackageManager pack) {
mContext = c;
mListAppInfo = list;
mPack = pack;
}
@Override
public int getCount() {
return mListAppInfo.size();
}
@Override
public Object getItem(int position) {
return mListAppInfo.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
TaskInfo entry = mListAppInfo.get(position);
if (convertView == null)
{
LayoutInflater inflater = LayoutInflater.from(mContext);
//System.out.println("Setting LayoutInflater in TaskAdapter " +mContext +" " +R.layout.taskinfo +" " +R.id.tmbox);
convertView = inflater.inflate(R.layout.taskinfo,null);
}
ImageView ivIcon = (ImageView)convertView.findViewById(R.id.tmImage);
ivIcon.setImageDrawable(entry.getIcon());
TextView tvName = (TextView)convertView.findViewById(R.id.tmbox);
tvName.setText(entry.getName());
convertView.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
final CheckBox checkBox = (CheckBox)v.findViewById(R.id.tmbox);
if(v.isSelected())
{
System.out.println("Listview not selected ");
//CK.get(arg2).setChecked(false);
checkBox.setChecked(false);
v.setSelected(false);
}
else
{
System.out.println("Listview selected ");
//CK.get(arg2).setChecked(true);
checkBox.setChecked(true);
v.setSelected(true);
}
}
});
return convertView;
public class TaskManager extends Activity implements Runnable
{
private ProgressDialog pd;
private TextView ram;
private String s;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.taskpage);
setTitleColor(Color.YELLOW);
Thread thread = new Thread(this);
thread.start();
}
@Override
public void run()
{
//System.out.println("In Taskmanager Run() Thread");
final PackageManager pm = getPackageManager();
final ListView box = (ListView) findViewById(R.id.cBoxSpace);
final List<TaskInfo> CK = populate(box, pm);
runOnUiThread(new Runnable()
{
@Override
public void run()
{
ram.setText(s);
box.setAdapter(new TaskAdapter(TaskManager.this, CK, pm));
//System.out.println("In Taskmanager runnable Run()");
endChecked(CK);
}
});
handler.sendEmptyMessage(0);
}
公共类TaskAdapter扩展了BaseAdapter{
私有上下文;
私人名单;
专用包装管理器mPack;
公共任务适配器(上下文c、列表、PackageManager包){
mContext=c;
mListAppInfo=列表;
mPack=包装;
}
@凌驾
public int getCount(){
返回mListAppInfo.size();
}
@凌驾
公共对象getItem(int位置){
返回mlistapingfo.get(位置);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
TaskInfo entry=mListAppInfo.get(位置);
if(convertView==null)
{
LayoutFlater充气机=LayoutFlater.from(mContext);
//System.out.println(“在TaskAdapter中设置LayoutFlater”+mContext+“”+R.layout.taskinfo+“”+R.id.tmbox);
convertView=充气机。充气(R.layout.taskinfo,null);
}
ImageView ivIcon=(ImageView)convertView.findViewById(R.id.tmImage);
setImageDrawable(entry.getIcon());
TextView tvName=(TextView)convertView.findViewById(R.id.tmbox);
tvName.setText(entry.getName());
setOnClickListener(新的OnClickListener()
{
@凌驾
公共void onClick(视图v){
最终复选框CheckBox=(复选框)v.findviewbyd(R.id.tmbox);
如果(v.isSelected())
{
System.out.println(“未选择Listview”);
//CK.get(arg2).setChecked(false);
checkBox.setChecked(false);
v、 已选择(假);
}
其他的
{
System.out.println(“选择Listview”);
//CK.get(arg2).setChecked(true);
checkBox.setChecked(true);
v、 已选择(正确);
}
}
});
返回视图;
公共类TaskManager扩展活动实现可运行
{
私营部门;
私有文本视图ram;
私有字符串;
@凌驾
创建时的公共void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.taskpage);
设置颜色(颜色:黄色);
螺纹=新螺纹(此);
thread.start();
}
@凌驾
公开募捐
{
//System.out.println(“In Taskmanager Run()线程”);
最终PackageManager pm=getPackageManager();
最终ListView框=(ListView)findViewById(R.id.cBoxSpace);
最终列表CK=填充(框,pm);
runOnUiThread(新的Runnable()
{
@凌驾
公开募捐
{
ram.setText(s);
box.setAdapter(新任务适配器(TaskManager.this,CK,pm));
//System.out.println(“In Taskmanager runnable Run()”;
endChecked(CK);
}
});
handler.sendEmptyMessage(0);
}
Taskinfo.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_horizontal">
<ImageView
android:id="@+id/tmImage"
android:layout_width="48dp"
android:layout_height="48dp"
android:scaleType="centerCrop"
android:adjustViewBounds="false"
android:focusable="false" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tmbox"
android:lines="2"/>
</LinearLayout>
Taskpage.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="@+id/cBoxSpace"
android:layout_width="wrap_content"
android:layout_height="400dp"
android:orientation="vertical"/>
<TextView
android:id="@+id/RAM"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp" />
<Button
android:id="@+id/endButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="End Selected Tasks" />
</LinearLayout>
如果您想知道通过单击选择多个项目的原因,我们将不胜感激。我一直在使用不同的实现、侦听器和ListAdapter,但都无济于事。我想关键是您只在视图中保存检查状态(v.setSelected) 您可以重用这些视图,因此其复选框始终不会更改其状态 可以创建状态数组来保存每个TaskInfo的每个检查状态,并在创建视图时检查此数组 比如说
// default is false
ArrayList<Boolean> checkingStates = new ArrayList<Boolean>(mListAppInfo.size());
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
TaskInfo entry = mListAppInfo.get(position);
if (convertView == null)
{
LayoutInflater inflater = LayoutInflater.from(mContext);
convertView = inflater.inflate(R.layout.taskinfo,null);
}
ImageView ivIcon = (ImageView)convertView.findViewById(R.id.tmImage);
ivIcon.setImageDrawable(entry.getIcon());
TextView tvName = (TextView)convertView.findViewById(R.id.tmbox);
tvName.setText(entry.getName());
final CheckBox checkBox = (CheckBox)v.findViewById(R.id.tmbox);
checkBox.setChecked(checkingStates.get(position));
convertView.setSelected(checkingStates.get(position));
convertView.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
if(v.isSelected())
{
System.out.println("Listview not selected ");
//CK.get(arg2).setChecked(false);
checkBox.setChecked(false);
v.setSelected(false);
checkingStates.get(position) = false;
}
else
{
System.out.println("Listview selected ");
//CK.get(arg2).setChecked(true);
checkBox.setChecked(true);
v.setSelected(true);
checkingStates.get(position) = true;
}
}
});
return convertView;
}
//默认值为false
ArrayList checkingStates=新的ArrayList(mListAppInfo.size());
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
TaskInfo entry=mListAppInfo.get(位置);
if(convertView==null)
{
LayoutFlater充气机=LayoutFlater.from(mContext);
convertView=充气机。充气(R.layout.taskinfo,null);
}
ImageView ivIcon=(ImageView)convertView.findViewById(R.id.tmImage);
setImageDrawable(entry.getIcon());
TextView tvName=(TextView)convertView.findViewById(R.id.tmbox);
tvName.setText(entry.getName());
最终复选框CheckBox=(复选框)v.findviewbyd(R.id.tmbox);
checkBox.setChecked(checkingStates.get(position));
convertView.setSelected(checkingStates.get(position));
setOnClickListener(新的OnClickListener()
{
@凌驾
公共void onClick(视图v){
如果(v.isSelected())
{
System.out.println(“未选择Listview”);
//CK.get(arg2).setChecked(false);
checkBox.setChecked(false);
v、 已选择(假);
checkingStates.get(position)=false;
}
其他的
{
System.out.println(“选择Listview”);
//CK.get(arg2).setChecked(true);
checkBox.setChecked(true);
v、 已选择(正确);
checkingStates.get(position)=true;
}
}
});
返回视图;
}
我不能100%确定您想做什么,但您的部分问题可能与您的onClick
方法中的条件有关:
if(v.isSelected())
我想你是想这样的
if(v.isChecked())
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
TaskInfo entry = mListAppInfo.get(position);
if (convertView == null)
{
LayoutInflater inflater = LayoutInflater.from(mContext);
//System.out.println("Setting LayoutInflater in TaskAdapter " +mContext +" " +R.layout.taskinfo +" " +R.id.tmbox);
convertView = inflater.inflate(R.layout.taskinfo,null);
}
ImageView ivIcon = (ImageView)convertView.findViewById(R.id.tmImage);
ivIcon.setImageDrawable(entry.getIcon());
TextView tvName = (TextView)convertView.findViewById(R.id.tmbox);
tvName.setText(entry.getName());
CheckBox checkBox = (CheckBox)v.findViewById(R.id.tmbox);
checkBox.setChecked(entry.isChecked());
}
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position, long id) {
entry = mListAppInfo.get(position);
entry.setChecked(!entry.isChecked());
}
});
package com.app.adapter;
public class CategoryDynamicAdapter {
public static ArrayList<CategoryBean> categoryList = new ArrayList<CategoryBean>();
Context context;
Typeface typeface;
public static String videoUrl = "" ;
Handler handler;
Runnable runnable;
// constructor
public CategoryDynamicAdapter(Activity a, Context context, Bitmap [] imagelist,ArrayList<CategoryBean> list) {
this.context = context;
this.categoryList = list;
this.a = a;
}
// Baseadapter to the set the data response from web service into listview.
public BaseAdapter mEventAdapter = new BaseAdapter() {
@Override
public int getCount() {
return categoryList.size();
}
@Override
public Object getItem(int position) {
return categoryList.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
class ViewHolder {
TextView title,category,uploadedBy;
ImageView image;
RatingBar video_rating;
Button report_video ,Flag_video;
}
public View getView(final int position, View convertView, final ViewGroup parent) {
ViewHolder vh = null ;
if(convertView == null) {
vh = new ViewHolder();
convertView = LayoutInflater.from(context).inflate (R .layout.custom_category_list_layout,null,false);
vh.title = (TextView) convertView .findViewById (R.id.title);
vh.image = (ImageView) convertView.findViewById(R.id.Imagefield);
convertView.setTag(vh);
}
else
{
vh=(ViewHolder) convertView.getTag();
}
try
{
final CategoryBean Cb = categoryList.get(position);
//pay attention to code below this line i have shown here how to select a listview using arraylist getter setter objects
String checkedStatus = Cb.getCheckedStringStaus();
if(checkdStatus.equal("0")
{
System.out.println("Listview not selected ");
//CK.get(arg2).setChecked(false);
checkBox.setChecked(false);
v.setSelected(false);
}
else ////checkdStatus.equal("1")
{
System.out.println("Listview selected ");
//CK.get(arg2).setChecked(true);
checkBox.setChecked(true);
v.setSelected(true);
}
catch (Exception e)
{
e.printStackTrace();
}