Question

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SharedPreferrences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();
    }

});

当我离开此页面时，又回来了。所有复选框状态都不会被选为默认状态。为什么呢？

Answer 1

您正在保存值，但是您必须恢复它们，您的活动就是这样开始的：

SharedPreferences prefs = getSharedPreferences("syllabus", 0);
checkbox1.setChecked(prefs.getBoolean("cbx1_ischecked" ,false));
checkbox2.setChecked(prefs.getBoolean("cbx2_ischecked" ,false));

Answer 2

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));

无法在Android中保存CheckBox的状态

2 个答案: