1

我在 ScrollView 中有一个 LinearLayout。我的布局如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/degree_planner_step2_title"
        style="@style/standard_text_view_appearance"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <View
        android:id="@+id/degree_planner_divider"
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/Science" />

    <ScrollView
        android:id="@+id/sv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/Commerce"
        android:fillViewport="true">

        <LinearLayout
            android:id="@+id/degreeplanner2_lin_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >
        </LinearLayout>
    </ScrollView>
</LinearLayout>

添加我的 ListViews 后，如果 fillViewPort 为 true，它会扩展所有内容，但是最后一个可见的 listview，“第 3 年”在其自身内部是可滚动的，而不是整个线性布局本身。当我检查 DDMS 时，它显示滚动视图不可滚动。如果 fillViewport 为 false，我在 LinearLayout 中的所有列表视图都会缩小并变成一个高且可滚动的项目。我试图让我的列表完全展开，并且在溢出时滚动视图应该滚动线性布局，而不是使列表视图中的单个项目滚动。有人能帮忙吗？

可以在此处找到图像：http: //i.stack.imgur.com/frU0P.png

在上面的屏幕截图中，fillViewPort = false，所有列表视图都缩小到一个项目高并且每个都可以单独滚动，存在 3 个列表视图。

这是我的片段代码，为简单起见，我已经用字母的简单数据加载了我的列表视图，动态添加列表视图的方法是 notifyCourseDataSetChange()：

import java.io.IOException;
import java.util.ArrayList;

import org.holoeverywhere.widget.Toast;

import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
import android.widget.TextView;

import com.actionbarsherlock.app.SherlockFragment;
import com.example.u2.R;
import com.example.u2.constantsandprocesses.Course;
import com.example.u2.constantsandprocesses.DatabaseHelper;
import com.example.u2.constantsandprocesses.DegreeYear;
import com.example.u2.constantsandprocesses.ScienceDegreePlan;
import com.example.u2.constantsandprocesses.UCT_Constants;
import com.example.u2.constantsandprocesses.DegreePlan;

public class DegreePlannerStep2Fragment extends SherlockFragment {
    private LinearLayout baseLayout;
    private DatabaseHelper DBHelper;
    private String faculty;
    private String degree;
    private String degreeAbbrev;
    private String major1;
    private String major2;
    private DegreePlan plan;
    private TextView title;
    private View divider;
    private int facultyColour;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SharedPreferences sp = getActivity().getSharedPreferences(UCT_Constants.PREFS_DEGREE, 0);
        faculty = sp.getString("faculty", null);
        degree = sp.getString("degree", null);
        degreeAbbrev = sp.getString("degreeAbbrev", null);
        major1 = sp.getString("major1", null);
        major2 = sp.getString("major2", null);
        setRetainInstance(true);
        if (savedInstanceState == null){
            DBHelper = new DatabaseHelper(getActivity());
            try {
                Log.d("DPS2", "connecting to db");
                DBHelper.connectDataBase();
            } catch (IOException e) {
                e.printStackTrace();
            }
            new GetAllCourses().execute(new String [] {major1, major2, faculty});
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.degree_planner_step_2, container, false);
        if (faculty!=null){
            facultyColour = selectColour(faculty);
            baseLayout = (LinearLayout) view.findViewById(R.id.degreeplanner2_lin_layout);
            title = (TextView) view.findViewById(R.id.degree_planner_step2_title);
            title.setText(degree);
            divider = view.findViewById(R.id.degree_planner_divider);
            divider.setBackgroundResource(facultyColour);
        }
        return view;
    }

    @Override
    public void onPause() {
        super.onPause();
        DBHelper.close();
    }

    @Override
    public void onResume() {
        super.onResume();
        //open database connection
        try {
            Log.d("DPS2", "opening db");
            DBHelper.connectDataBase();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /*
     * returns the id (int) of the colour variable for the faculty
     */
    private int selectColour(String facultyName) {
        String [] faculties = getActivity().getResources().getStringArray(R.array.faculties);
        if (facultyName.equals(faculties[0])){
            return R.color.Commerce;
        }else if(facultyName.equals(faculties[1])){
            return R.color.EBE;
        }else if(facultyName.equals(faculties[2])){
            return R.color.Health_Sciences;
        }else if(facultyName.equals(faculties[3])){
            return R.color.Humanities;
        }else if (facultyName.equals(faculties[4])){
            return R.color.Law;
        }else{
            return R.color.Science;
        }
    }

    public void notifyCourseDataSetChange(){
        for (DegreeYear dy : plan.getDegreeYears()){
            if (dy.isActive()){
                LayoutInflater inflater = getActivity().getLayoutInflater();
                View sectionHeader = inflater.inflate(R.layout.listview_section_header, null);
                ((TextView)sectionHeader.findViewById(R.id.section_header_title)).setText("Year "+dy.getYear());        //section header title
                sectionHeader.findViewById(R.id.section_header_divider).setBackgroundResource(facultyColour);   //section header divider
                ListView lv = new ListView(getActivity());
                lv.setHeaderDividersEnabled(false);
                lv.addHeaderView(sectionHeader);
                lv.setAdapter(new ArrayAdapter<String>(getActivity(), R.layout.drawer_list_item,new String [] {"a","b","c","d"}));
                baseLayout.addView(lv);
            }
        }
    }

    private class GetAllCourses extends AsyncTask<String, Void, ArrayList<Course>>{
        String facultyName = "";

        @Override
        protected ArrayList<Course> doInBackground(String... params) {
            facultyName = params[2];
            return DBHelper.getCoursesForMajor(params[0], params[1]);
        }

        @Override
        protected void onPostExecute(ArrayList<Course> result) {
            super.onPostExecute(result);
            String [] faculties = getActivity().getResources().getStringArray(R.array.faculties);
            if (facultyName.equals(faculties[0])){          //COM
                //TODO create corresponding degree
            }else if(facultyName.equals(faculties[1])){     //EBE
                //TODO create corresponding degree
            }else if(facultyName.equals(faculties[2])){     //Health
                //TODO create corresponding degree
            }else if(facultyName.equals(faculties[3])){     //HUM
                //TODO create corresponding degree
            }else if (facultyName.equals(faculties[4])){    //LAW
                //TODO create corresponding degree
            }else{                                          //SCI
                plan = new ScienceDegreePlan(result);
            }
            notifyCourseDataSetChange();
        }

    }
}
4

2 回答 2

1

这里的问题是您在 ScrollView 中添加 ListView。这是来自文档的引用

永远不要将 ScrollView 与 ListView 一起使用，因为 ListView 负责自己的垂直滚动。最重要的是，这样做会破坏 ListView 中处理大型列表的所有重要优化，因为它有效地强制 ListView 显示其整个项目列表以填充 ScrollView 提供的无限容器。

因此，您只需要添加没有 ListView 的项目。

于 2013-07-16T22:58:45.957 回答
0

你可以RecyclerView改用。RecyclerView请注意，如果您确实使用它，则必须根据适配器的需要对适配器进行更改RecyclerView.Adapter。

回收站视图

它的滚动和感觉就像 ListView 一样。

编辑：我忘了提到您需要确保在运行notifyDataSetChanged()时不要onBindViewHolder运行。它一直循环运行。或者您可以使用notifyItemInserted(int position)andnotifyItemRemoved(int position)通知适配器刷新它。 notifyItemInserted和notifyItemRemoved。

于 2018-05-26T10:43:41.227 回答