Question

我不想在BaseAdapter中使用布局文件。我想在基本适配器中创建视图，因此我可以为每个listview调用此适配器。我的代码不起作用。

这是我的代码：

public class MyAdapter extends BaseAdapter {

    private Context context;
    private List<PublicObject> objects;

    public MyAdapter(Context context, List<PublicObject> objects)
    {
        this.context = context;
        this.objects = objects;
    }

    @Override
    public int getCount() {
        return this.objects.size();
    }

    @Override
    public Object getItem(int position) {
        return this.objects.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    private TextView CreateTextView()
    {
        TextView txtView = new TextView(this.context);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT, 1);
        txtView.setGravity(View.TEXT_ALIGNMENT_CENTER);
        txtView.setLayoutParams(lp);
        txtView.setTextSize(14);
        txtView.setTextColor(Color.BLACK);
        return txtView;
    }

    protected static class ViewHolder
    {
        private List<TextView> viewList;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if(convertView == null)
        {
            LinearLayout lnr = new LinearLayout(this.context);
            lnr.setOrientation(LinearLayout.HORIZONTAL);
            LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
            lnr.setLayoutParams(lp);
            List<TextView> viewList = new ArrayList<>();
            for(int i = 0, limit = this.objects.get(0).GetList().size(); i < limit; i++) {
                TextView txt = this.CreateTextView();
                lnr.addView(txt);
                viewList.add(txt);
            }
            convertView = lnr;
            viewHolder = new ViewHolder();
            viewHolder.viewList = viewList;
            convertView.setTag(viewHolder);
        }
        else viewHolder = (ViewHolder) convertView.getTag();
        List<TextView> views = viewHolder.viewList;
        List<String> s = this.objects.get(position).GetList();
        for(int i = 0, limit = s.size(); i < limit; i++)
        {
            TextView txt = views.get(i);
            txt.setText(s.get(i));
        }
        return convertView;
    }
}

这是我的模特课，

public class PublicObject {
    private List<String> list;

    public PublicObject(List<String> list) {
        this.list = list;
    }

    public List<String> GetList() {
        return this.list;
    }
}

错误

9 16：30：23.668 302-302 / com.example.deryaaxis.searchviewtempalte E / AndroidRuntime：FATAL EXCEPTION：main 处理：com.example.deryaaxis.searchviewtempalte，PID：302 java.lang.ClassCastException：android.widget.LinearLayout $ LayoutParams无法强制转换为android.widget.AbsListView $ LayoutParams 在android.widget.ListView.measureScrapChild（ListView.java:1183）在android.widget.ListView.measureHeightOfChildren（ListView.java:1265）在android.widget.ListView.onMeasure（ListView.java:1175）在android.view.View.measure（View.java:16820）在android.widget.RelativeLayout.measureChildHorizontal（RelativeLayout.java:719）在android.widget.RelativeLayout.onMeasure（RelativeLayout.java:455）在android.view.View.measure（View.java:16820）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5156）在android.widget.FrameLayout.onMeasure（FrameLayout.java:310）在android.support.v7.widget.ContentFrameLayout.onMeasure（ContentFrameLayout.java:135）在android.view.View.measure（View.java:16820）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5156）在android.support.v7.widget.ActionBarOverlayLayout.onMeasure（ActionBarOverlayLayout.java:391）在android.view.View.measure（View.java:16820）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5156）在android.widget.FrameLayout.onMeasure（FrameLayout.java:310）在android.view.View.measure（View.java:16820）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5156）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1404）在android.widget.LinearLayout.measureVertical（LinearLayout.java:695）在android.widget.LinearLayout.onMeasure（LinearLayout.java:588）在android.view.View.measure（View.java:16820）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5156）在android.widget.FrameLayout.onMeasure（FrameLayout.java:310）在com.android.internal.policy.impl.PhoneWindow $ DecorView.onMeasure（PhoneWindow.java:2295）在android.view.View.measure（View.java:16820）在android.view.ViewRootImpl.performMeasure（ViewRootImpl.java:1962）在android.view.ViewRootImpl.measureHierarchy（ViewRootImpl.java:1156）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1341）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1043）在android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:5885）在android.view.Choreographer $ CallbackRecord.run（Choreographer.java:771）在android.view.Choreographer.doCallbacks（Choreographer.java:574）在android.view.Choreographer.doFrame（Choreographer.java:544）在android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:757）在android.os.Handler.handleCallback（Handler.java:733）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:149）在android.app.ActivityThread.main（ActivityThread.java:5257） at java.lang.reflect.Method.invokeNative（Native Method）在java.lang.reflect.Method.invoke（Method.java:515）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:794）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:610）在dalvik.system.NativeStart.main（本地方法）

Answer 1

这里的问题可能是因为您使用LayoutParams for Linear Layout作为textView，然后将该textView放入listView。您应该将LinearLayout.LayoutParams更改为此

txtView.setLayoutParams(new ViewGroup.LayoutParams(
    ViewGroup.LayoutParams.MATCH_PARENT,
    ViewGroup.LayoutParams.WRAP_CONTENT));

如何在基本适配器

1 个答案: