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我正在开发一个应用程序。一页中有许多复选框。我想在退出页面时保存 CheckBox 的状态。我使用 SharedPreferences 来保存。代码是这样的：

checkbox1.setOnCheckedChangeListener(new OnCheckedChangeListener(){
    public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
// TODO Auto-generated method stub
Editor editor = getSharedPreferences("syllabus", 0).edit();
editor.putBoolean("cbx1_ischecked", isChecked);
editor.commit();
}
    });
checkbox2.setOnCheckedChangeListener(new OnCheckedChangeListener(){
    public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
    // TODO Auto-generated method stub
    Editor editor = getSharedPreferences("syllabus", 0).edit();
    editor.putBoolean("cbx2_ischecked", isChecked);
    editor.commit();
    }

});

当我离开这个页面，然后再回来。默认情况下，所有复选框状态都不会被选中。为什么？

4

2 回答 2

2

您正在保存值，但您必须恢复它们，您的活动是这样开始的：

SharedPreferences prefs = getSharedPreferences("syllabus", 0);
checkbox1.setChecked(prefs.getBoolean("cbx1_ischecked" ,false));
checkbox2.setChecked(prefs.getBoolean("cbx2_ischecked" ,false));
于 2012-11-26T09:14:14.993 回答
0

试试这个

 boolean check1,check2;
 checkbox1.setOnCheckedChangeListener(new OnCheckedChangeListener(){
 public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
 // TODO Auto-generated method stub
  check1=isChecked;

 }
});

checkbox2.setOnCheckedChangeListener(new OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton arg0, boolean isChecked) {
// TODO Auto-generated method stub
 check2=isChecked;

}

}); 

//store boolean only once when you leave the activity
 Editor editor = getSharedPreferences("syllabus", 0).edit();
 editor.putBoolean("cbx1_ischecked", check1);
 editor.putBoolean("cbx2_ischecked", check2);
 editor.commit();


 In onCreate()

  SharedPreferences prefs = getSharedPreferences("syllabus", 0);
  checkbox1.setChecked(prefs.getBoolean("cbx1_ischecked" ,false));
  checkbox2.setChecked(prefs.getBoolean("cbx2_ischecked" ,false));
于 2012-11-26T10:11:31.343 回答