我想使用SharedPreferences保存我的复选框的状态。我以为我的代码是正确的,因为它没有显示任何错误。我检查了LogCat的原因,显然onResume有问题。为什么onResume在启动时崩溃我的应用程序?
SuikodenFragment.java
public class SuikodenFragment extends Fragment implements OnItemClickListener {
public static final String suikodenprefs = "SuikodenPrefs" ;
ListView listView;
ArrayAdapter<Model> adapter;
List<Model> list = new ArrayList<Model>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.suikoden_main_activity1, container, false);
listView = (ListView) view.findViewById(R.id.my_list);
adapter = new SuikodenListAdapter(getActivity(),getModel());
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
//CheckBox lBox1 = (CheckBox) view.findViewById(R.id.check);
return view;
}
@Override
public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3) {
TextView label = (TextView) v.getTag(R.id.label);
CheckBox checkbox = (CheckBox) v.getTag(R.id.check);
Toast.makeText(v.getContext(), label.getText().toString()+" "+isCheckedOrNot(checkbox), Toast.LENGTH_LONG).show();
}
private String isCheckedOrNot(CheckBox checkbox) {
if(checkbox.isChecked())
return "is checked";
else
return "is not checked";
}
private void save(final boolean isChecked) {
SharedPreferences settings = getActivity().getSharedPreferences(suikodenprefs, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("check", isChecked);
editor.commit();
}
private boolean load() {
SharedPreferences settings = getActivity().getSharedPreferences(suikodenprefs, 0);
return settings.getBoolean("check", false);
}
@Override
public void onPause() {
super.onPause();
save(mCheckBox.isChecked());
}
@Override
public void onResume() {
super.onResume();
mCheckBox.setChecked(load());
}
也有在这个片段,我上面放,因为它是相当长的一个ListView。我尝试删除onResume,应用程序启动,但当我点击一个复选框,并移动到另一个片段(从导航抽屉)它崩溃。这两种崩溃都有相同的共同点。
因为撞车的onResume ...
mCheckBox.setChecked(load());
当的onResume被删除,因为的onPause的崩溃发生(下文具体线)片段之间切换时...
save(mCheckBox.isChecked());
什么想法?谢谢!
编辑按要求 - 以下
suikoden_activity_main1.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" >
<ListView
android:id="@+id/my_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
suikoden_row_1.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="30dip"
android:text="@+id/label"
android:textSize="25sp" >
</TextView>
<CheckBox
android:id="@+id/check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:focusableInTouchMode="false" >
</CheckBox>
EDIT 2
这是我从原来的拿到了SharedPreferences代码。 How to save the state of an Android CheckBox when the users exits the application?
'lBox1'可能为null – Raghunandan
请看'Activity'生命周期。 'onResume'在'onCreateView'之前被调用。发生'NullPointerException'是因为lBox1没有被初始化。 – Wakim
@Wakim恰恰相反 –