android - 使用复选框在自定义 ListView 中保存复选框的状态

Question

我有一个带有复选框的 ListView ，我希望当用户选择任何复选框并关闭应用程序并再次打开应用程序时，应该选中相同的复选框。即我必须使用 sharedpref 方法保存 ListView 项的复选框的状态。在这里我已经实现了相同的，但没有得到想要的结果，我已经尝试了很多请帮助我。

MyCustomAdapter.java

public class MyCustomBaseAdapter extends BaseAdapter implements OnCheckedChangeListener {
    private static ArrayList<SearchResults> searchArrayList;
    ViewHolder holder;
    private LayoutInflater mInflater;
    Editor editor;
    Context context;

    public MyCustomBaseAdapter(Context context, ArrayList<SearchResults> results) {
        searchArrayList = results;
        mInflater = LayoutInflater.from(context);
    }

    public int getCount() {
        return searchArrayList.size();

    }

    public Object getItem(int position) {
        return searchArrayList.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) 
    {
        SharedPreferences sharedPrefs = context.getSharedPreferences("sharedPrefs", Context.MODE_PRIVATE);


        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.custom_row_view, null);
            holder = new ViewHolder();
            holder.txtName = (TextView) convertView.findViewById(R.id.name);
            holder.cB = (CheckBox)convertView.findViewById(R.id.cb_category);

            convertView.setTag(holder);
        } 
        else {
            holder = (ViewHolder) convertView.getTag();
        }


        editor = sharedPrefs.edit();

        holder.txtName.setText(searchArrayList.get(position).getName());

        holder.cB.setChecked(sharedPrefs.getBoolean("CheckValue", false));

        return convertView;
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // TODO Auto-generated method stub


        if(holder.cB.isChecked()){

            editor.putBoolean("CheckValue", holder.cB.isChecked());
            editor.commit();
        }
    }


    static class ViewHolder {
        TextView txtName;
        CheckBox cB;
    }

}

CutomListviewActivity.java

public class CustomListViewActivity extends Activity {



    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        ArrayList<SearchResults> searchResults = GetSearchResults();

        final ListView lv1 = (ListView) findViewById(R.id.ListView01);
        lv1.setAdapter(new MyCustomBaseAdapter(this, searchResults));

        lv1.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> a, View view, int position, long id) { 
                Object o = lv1.getItemAtPosition(position);
                SearchResults fullObject = (SearchResults)o;
                String s=fullObject.getName().toString();
                Toast.makeText(CustomListViewActivity.this, "You have chosen: " + " " + s, Toast.LENGTH_LONG).show();
                Toast.makeText(CustomListViewActivity.this, s, Toast.LENGTH_LONG).show();

            }  
        });


    }



    private ArrayList<SearchResults> GetSearchResults()
    {
        ArrayList<SearchResults> results = new ArrayList<SearchResults>();

        SearchResults sr1 = new SearchResults();
        sr1.setName("John Smith");

        results.add(sr1);

        sr1 = new SearchResults();
        sr1.setName("Jane Doe");

        results.add(sr1);

        sr1 = new SearchResults();
        sr1.setName("Steve Young");

        results.add(sr1);

        sr1 = new SearchResults();
        sr1.setName("Fred Jones");

        results.add(sr1);



        return results;
    }
}

GetterSetter 类

package com.list;

public class SearchResults {
     private String name = "";


     public void setName(String name) {
      this.name = name;
     }

     public String getName() {
      return name;
     }


    }

行布局.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"
  >
  <TextView 
  android:id="@+id/name"
  android:textSize="14sp" 
  android:textStyle="bold" 
  android:textColor="#FFFFFF" 
  android:layout_width="wrap_content" 
  android:layout_height="wrap_content"
  android:text="TextView"/>


  <CheckBox 
      android:id="@+id/cb_category"
      android:layout_height="wrap_content"
      android:layout_width="wrap_content"
      android:layout_marginLeft="25dp"/>

</LinearLayout>

主.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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical|center_horizontal"
        android:text="Custom ListView Contents" />

    <ListView
        android:id="@+id/ListView01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

提前致谢

Answer 1

您的代码几乎是正确的。只需要做一些改变...

检查我的 setOnCheckedChangeListener 代码是否有复选框。我希望它能工作

public class MyCustomBaseAdapter extends BaseAdapter {
    private static ArrayList<SearchResults> searchArrayList;
    ViewHolder holder;
    private LayoutInflater mInflater;
    Editor editor;
    Context context;

    public MyCustomBaseAdapter(Context context, ArrayList<SearchResults> results) {
        searchArrayList = results;
        mInflater = LayoutInflater.from(context);
    }

    public int getCount() {
        return searchArrayList.size();

    }

    public Object getItem(int position) {
        return searchArrayList.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) 
    {
        SharedPreferences sharedPrefs = context.getSharedPreferences("sharedPrefs", Context.MODE_PRIVATE);


        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.custom_row_view, null);
            holder = new ViewHolder();
            holder.txtName = (TextView) convertView.findViewById(R.id.name);
            holder.cB = (CheckBox)convertView.findViewById(R.id.cb_category);

            convertView.setTag(holder);
        } 
        else {
            holder = (ViewHolder) convertView.getTag();
        }


        editor = sharedPrefs.edit();

        holder.txtName.setText(searchArrayList.get(position).getName());

        holder.cB.setChecked(sharedPrefs.getBoolean("CheckValue"+position, false));
       holder.cB.setOnCheckedChangeListener(new OnCheckedChangeListener() {
       @Override
       public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
       editor.putBoolean("CheckValue"+position, isChecked);
       editor.commit();
       }});
        return convertView;
    }


    static class ViewHolder {
        TextView txtName;
        CheckBox cB;
    }

}