Question

我有一个listview所有安装应用。我正在使用自定义适配器现在问题是这个我要保存复选框状态当我检查复选框时它的状态保存在共享偏好中并且再次当应用程序重新启动时我打开listview复选框状态自动检查我保存。怎么做到这个？这是我的代码

public class Listadapter extends BaseAdapter {
    private Context mContext;
    private List<ApplicationInfo> mListAppInfo;
    private PackageManager mPackManager;
    private ArrayList<Boolean> checkList = new ArrayList<Boolean>();
    CheckBox checkBox;
    boolean index[];
    boolean[] itemChecked;
    public Listadapter(Context applicationContext, List<ApplicationInfo> installedApplication, PackageManager packageManager) {
        //super(applicationContext,textViewResourceId,installedApplication);
            super();
            this.mContext = applicationContext;
            this.mListAppInfo = installedApplication;
            index = new boolean[installedApplication.size()];
            this.mPackManager = packageManager;
            for (int i = 0; i < installedApplication.size(); i++) {
            checkList.add(false);
            itemChecked = new boolean[installedApplication.size()];
            }
    }
    private class ViewHolder {
        ImageView ivAppIcon;
        TextView tvAppName;
        TextView tvPkgName;
        CheckBox checkBox;
    }
    @Override
    public int getCount() {
        return mListAppInfo.size();
        //return ((null != mListAppInfo) ? mListAppInfo.size() : 0);
    }

    @Override
    public Object getItem(int position) {
       // index = new boolean[mListAppInfo.size()];
        return mListAppInfo.get(position);
    }

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

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        // get the selected entry

        final ViewHolder holder;

      //  LayoutInflater inflater = (LayoutInflater) mContext.getLayoutInflater();
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService( Context.LAYOUT_INFLATER_SERVICE );

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder();
        // reference to convertView
            holder.tvAppName = (TextView) convertView
                    .findViewById(R.id.textView1);
            holder.tvPkgName = (TextView) convertView
                    .findViewById(R.id.textView);
            holder.checkBox = (CheckBox) convertView
                    .findViewById(R.id.checkBox1);
            holder.ivAppIcon = (ImageView) convertView
                    .findViewById(R.id.imageView);

            convertView.setTag(holder);
            // holder.ck1.setTag(packageList.get(position));

        }
             else {

                holder = (ViewHolder) convertView.getTag();
            }
        final ApplicationInfo entry = mListAppInfo.get(position);

        holder.ivAppIcon.setImageDrawable(entry.loadIcon(mPackManager));
        holder.tvAppName.setText(entry.loadLabel(mPackManager));
        holder.tvPkgName.setText(entry.packageName);
        holder.checkBox.setChecked(false);


        holder.checkBox.setChecked(false);

        if (itemChecked[position])
            holder.checkBox.setChecked(true);
        else
            holder.checkBox.setChecked(false);

        holder.checkBox.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (holder.checkBox.isChecked())
                    itemChecked[position] = true;
                else
                    itemChecked[position] = false;
            }
        });
        return convertView;
    }
}

Answer 1

我会在共享偏好设置键中使用您的复选框“位置”：

    SharedPreferences sharedPreferences = getActivity().getSharedPreferences("yourSharedPref", 0);
    SharedPreferences.Editor editor = sharedPreferences.edit();

并存储我的复选框状态：

    if (holder.checkBox.isChecked())
        editor.putBoolean("CheckBoxState" + position, true);  
    else
        editor.putBoolean("CheckBoxState" + position, false);

然后通过解析此位置来恢复复选框状态：

    for(int i = 0 ; i < positionMax ; i++){
        sharedPreferences.getBoolean("CheckBoxState" + i);
        //Do what you want with this value.
    }

Answer 2

holder.checkBox.setChecked（）应该读取状态，例如。来自开发人员文档：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
boolean defaultValue = getResources().getBoolean(R.string.default_value);
boolean isChecked = sharedPref.getBoolean(getString(R.string.saved_state), defaultValue);

在onClick（）方法中，你写了状态：

SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean(getString(R.string.saved_state), newState);
editor.commit();

检查docs。

android如何在sharedpreference中保存自定义复选框状态，并在应用程序重启后获取

2 个答案: