我正在开发一个需要首选项页面的应用程序（使用复选框），并在用户按下完成后显示所选兴趣之后，我想保存复选框信息/复选框。目标是让用户离开复选框页面，然后返回以检查相同的框和相同的结果字符串。
使用下面的当前代码，我可以选中复选框，但是当我点击“完成”时页面崩溃了。我没有正确保存实例吗？
也许有用的信息：
1）我使用“完成”按钮作为保存按钮，并在创建页面时发生“加载”（如果是第一次加载页面，则列表和字符串结果将设置为空值
2）涉及保存数据的代码区域（崩溃发生的地方）是“public void finalSelection”（完成按钮）和/或“public void onCreate”（创建加载时）
谢谢，
拉里
==================守则=======================
public class Interests extends Activity {
static final String STATE_Selection="arrayInterests";
static final String STATE_Interests="stringInterests";
public ArrayList<String> selection;
public String final_interests;
TextView final_text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
// Restore value of members from saved state
selection = savedInstanceState.getStringArrayList(STATE_Selection);
final_interests = savedInstanceState.getString(STATE_Interests);
} else {
selection = new ArrayList<String>();
final_interests= "";
}
setContentView(R.layout.activity_interests);
final_text = (TextView)findViewById(R.id.final_result);
final_text.setEnabled(false);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_interests, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void selectItem(View view){
boolean checked = ((CheckBox) view).isChecked();
switch (view.getId())
{
case R.id.baby_box:
if(checked)
{selection.add("Baby");}
else
{selection.remove("Baby");}
break;
case R.id.travel_box:
if(checked)
{selection.add("Travel");}
else
{selection.remove("Travel");}
break;
case R.id.electronics_box:
if(checked)
{selection.add("Electronics");}
else
{selection.remove("Electronics");}
break;
case R.id.services_box:
if(checked)
{selection.add("Services");}
else
{selection.remove("Services");}
break;
case R.id.entertainment_box:
if(checked)
{selection.add("Entertainment");}
else
{selection.remove("Entertainment");}
break;
case R.id.sports_box:
if(checked)
{selection.add("Sports");}
else
{selection.remove("Sports");}
break;
case R.id.garden_box:
if(checked)
{selection.add("Garden");}
else
{selection.remove("Garden");}
break;
case R.id.outdoors_box:
if(checked)
{selection.add("Outdoors");}
else
{selection.remove("Outdoors");}
break;
case R.id.books_box:
if(checked)
{selection.add("Books");}
else
{selection.remove("Books");}
break;
case R.id.auto_box:
if(checked)
{selection.add("Auto");}
else
{selection.remove("Auto");}
break;
case R.id.food_box:
if(checked)
{selection.add("Food");}
else
{selection.remove("Food");}
break;
case R.id.familyfriends_box:
if(checked)
{selection.add("Family and Friends");}
else
{selection.remove("Family and Friends");}
break;
case R.id.music_box:
if(checked)
{selection.add("Music");}
else
{selection.remove("Music");}
break;
case R.id.office_box:
if(checked)
{selection.add("Office");}
else
{selection.remove("Office");}
break;
case R.id.grocery_box:
if(checked)
{selection.add("Grocery");}
else
{selection.remove("Grocery");}
break;
case R.id.pets_box:
if(checked)
{selection.add("Pets");}
else
{selection.remove("Pets");}
break;
case R.id.homeimprovement_box:
if(checked)
{selection.add("Home Improvement");}
else
{selection.remove("Home Improvement");}
break;
case R.id.jewelery_box:
if(checked)
{selection.add("Jewelery");}
else
{selection.remove("Jewelery");}
break;
case R.id.decor_box:
if(checked)
{selection.add("Decor");}
else
{selection.remove("Decor");}
break;
case R.id.beauty_box:
if(checked)
{selection.add("Beauty");}
else
{selection.remove("Beauty");}
break;
case R.id.toysgames_box:
if(checked)
{selection.add("Toys and Games");}
else
{selection.remove("Toys and Games");}
break;
case R.id.fashion_box:
if(checked)
{selection.add("Fashion");}
else
{selection.remove("Fashion");}
break;
case R.id.health_box:
if(checked)
{selection.add("Health");}
else
{selection.remove("Health");}
break;
case R.id.artscrafts_box:
if(checked)
{selection.add("Arts and Crafts");}
else
{selection.remove("Arts and Crafts");}
break;
}
}
public void finalSelection(View view, Bundle savedInstanceState){
for(String Selections : selection)
{
final_interests= final_interests + Selections + "\n";
}
final_text.setText(final_interests);
final_text.setEnabled(true);
// Save the user's current game state
savedInstanceState.putStringArrayList(STATE_Selection, selection);
savedInstanceState.putString(STATE_Interests, final_interests);
// Always call the superclass so it can save the view hierarchy state
super.onSaveInstanceState(savedInstanceState);
}
}
答案 0 :(得分：1)
要回答您的问题并阐述其他评论，对于应用程序使用的数据存储而不是状态更改信息，如果您需要大量信息，请使用SharedPreferences或Sqlite数据库。