问题描述

Listview复选框的选择

我创建了一个自定义的 listview，有 Image，Text 和 checkbox。如何检测是否选择或未选择复选框。我使用了 onItemClick() 但是没有被调用。我使用的正确吗？

class PInfo {    String appname = """";    String pname = """";    Drawable icon; }public class InstalledApps extends Activity{private static LayoutInflater inflater=null;private ListView listview;private Activity activity;List<PInfo> installedApps = new ArrayList<PInfo>();@Overrideprotected void onCreate(Bundle savedInstanceState) {    // TODO Auto-generated method stub    super.onCreate(savedInstanceState);    setContentView(R.layout.applist);    activity = this;    listview = (ListView)findViewById(R.id.listView1);    PackageManager pm = getPackageManager();    List<ApplicationInfo> packages = pm.getInstalledApplications(PackageManager.GET_META_DATA);    for(ApplicationInfo app : packages) {        PInfo newInfo = new PInfo();        newInfo.appname = (String) app.loadLabel(pm);        newInfo.pname = app.packageName;        //newInfo.icon = app.icon;        //Drawable dd = activity.getResources().getDrawable(app.icon);        newInfo.icon = app.loadIcon(getPackageManager());        if((app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) == 1) {                    installedApps.add(newInfo);        } else if ((app.flags & ApplicationInfo.FLAG_SYSTEM) == 1) {            installedApps.add(newInfo);        } else {            installedApps.add(newInfo);        }    }    InstalledAppsAdapter iap = new InstalledAppsAdapter(this installedApps);    listview.setAdapter(iap);}  }class InstalledAppsAdapter extends BaseAdapter{private Activity activity;private static LayoutInflater inflater=null;List<PInfo> installedApps = new ArrayList<PInfo>();ListView listview; public InstalledAppsAdapter(Activity a List<PInfo> b) {    // TODO Auto-generated constructor stub    installedApps = b;    activity = a;    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    listview = (ListView)activity.findViewById(R.id.listView1);       //Here is where I have put it currently..    listview.setOnItemClickListener(new OnItemClickListener() {        @Override        public void onItemClick(AdapterView<?> arg0 View arg1 int arg2                long arg3) {            // TODO Auto-generated method stub            PInfo newInfo = (PInfo) listview.getItemAtPosition(arg2);            System.out.println(newInfo.appname);        }    });}@Overridepublic int getCount() {    // TODO Auto-generated method stub    return installedApps.size();}@Overridepublic Object getItem(int arg0) {    // TODO Auto-generated method stub    return arg0;}@Overridepublic long getItemId(int arg0) {    // TODO Auto-generated method stub    return arg0;}@Overridepublic View getView(int arg0 View arg1 ViewGroup arg2) {    // TODO Auto-generated method stub    View  customView = inflater.inflate(R.layout.listrow arg2false);    ImageView iv = (ImageView)customView.findViewById(R.id.imageView1);    TextView tv= (TextView) customView.findViewById(R.id.textView2);    CheckBox cb= (CheckBox)customView.findViewById(R.id.checkBox1);    PInfo pinfo = installedApps.get(arg0);        tv.setText(""""+pinfo.appname);        iv.setImageDrawable(pinfo.icon);    return customView;}}

我要在哪里添加下面的代码（如果这是正确的listner）

listview.setOnItemClickListener(new OnItemClickListener() {        @Override        public void onItemClick(AdapterView<?> arg0 View arg1 int arg2                long arg3) {            // TODO Auto-generated method stub            PInfo newInfo = (PInfo) listview.getItemAtPosition(arg2);            System.out.println(newInfo.appname);        }    });

谢谢！

解决方案

在 getView 里面加入下面的代码：

@Overridepublic View getView(int arg0 View arg1 ViewGroup arg2) {// TODO Auto-generated method stubView  customView = inflater.inflate(R.layout.listrow arg2false);ImageView iv = (ImageView)customView.findViewById(R.id.imageView1);TextView tv= (TextView) customView.findViewById(R.id.textView2);CheckBox cb= (CheckBox)customView.findViewById(R.id.checkBox1);cb.setOnCheckedChangeListener(new OnCheckedChangeListener(){public void onCheckedChanged(CompoundButton buttonView boolean isChecked){    if ( isChecked )    {        // perform logic    }}});}PInfo pinfo = installedApps.get(arg0);    tv.setText(""""+pinfo.appname);    iv.setImageDrawable(pinfo.icon);return customView;}

解决方案二：
首先你得确认是哪里报错，我觉得不是因为id的原因
定位到错误信息在哪没