Question

我定义了一个复选框并且没有为其分配任何值每次我点击它并打印复选框的值时，每次都会显示true。

我将结果放在SharedPreferences中然后检索它为什么总是true？

public class CallAndSms extends Activity{
static SQLiteDatabase myDB= null;
static     Context context ;
static ListView lv;
static CallAndSmsAdaptor adapter;
static ArrayList<String> AllData= new ArrayList<String>();
CheckBox save;
static SharedPreferences preferences;
SharedPreferences.Editor editor=null;
 @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);





    setContentView(R.layout.sms_call);
     preferences = getSharedPreferences("modes",Context.MODE_PRIVATE);
     editor = preferences.edit();



    save= (CheckBox) findViewById(R.id.save);


    save.setChecked(preferences.getBoolean("save", true));



    context=this;


     save.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(CompoundButton arg0, boolean arg1) {

            if ( save.isChecked()){
                Log.i("save save", save.isChecked()+"");

                  editor.putBoolean("save", true);

            }

            else 

                  {editor.putBoolean("save", false);}

            Log.i("pref", preferences.getBoolean("save", true)+"");


        }
    });


 }
 }

Answer 1

您永远不会apply()（或commit()）您的偏好更改因此，您始终可以检索默认值。

Answer 2

编辑后，您必须提交 shared preferences。

save.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
           if ( save.isChecked()){
              Log.i("save save", save.isChecked()+"");
              editor.putBoolean("save", true);
              editor.commit();
           }else{
              editor.putBoolean("save", false);
              editor.commit();
           }
              Log.i("pref", preferences.getBoolean("save", true)+"");
        }
    });

检查android复选框始终为true

2 个答案: