[英]android how to save custom checkbox state in sharedpreference and get it after app restart
I have a listview
of all install app. 我有所有安装应用程序的listview
。 I am using custom adapter now issue is this I want to save checkbox state when I check checkbox its state save in sharedpreferences and again when app restart and I open the listview checkbox state auto check which I save. 我正在使用自定义适配器,现在的问题是,我要保存复选框状态,当我将复选框的状态保存在sharedpreferences中时,然后在应用程序重新启动时又打开我保存的listview复选框状态自动检查。 How to make this? 怎么做? Here is my code 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;
}
}
I would use your checkbox "position" in the shared preferences key : 我会在共享的首选项键中使用您的复选框“ position”:
SharedPreferences sharedPreferences = getActivity().getSharedPreferences("yourSharedPref", 0);
SharedPreferences.Editor editor = sharedPreferences.edit();
And store my checkbox's state like this : 并像这样存储我的复选框的状态:
if (holder.checkBox.isChecked())
editor.putBoolean("CheckBoxState" + position, true);
else
editor.putBoolean("CheckBoxState" + position, false);
Then you restore your checkboxes state by parsing this position : 然后,您可以通过解析以下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.
}
holder.checkBox.setChecked() should read state, ex. holder.checkBox.setChecked()应该读取状态,例如。 from developer docs: 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);
In the method onClick() you write state: 在方法onClick()中,您可以编写状态:
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putBoolean(getString(R.string.saved_state), newState);
editor.commit();
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