Question

我想有这样的功能 - 我有一个Dialog（带设置），其中有一个带有两个RadioButtons的RadioGroup。当我使用“保存”按钮关闭对话框时，我不仅希望将数据保存在我的Data类中，而且还希望在下次打开时将Dialog打开并保存设置。我试图用RadiGroup方法实现这个：getCheckedRadioButtonId（）和.check（int），但我的解决方案不起作用，我不知道为什么。

我的代码：

SettingsDialogFragment.java

public class SettingsDialogFragment extends DialogFragment{

    private boolean ifMale;
    private int checkedRadio;
    private RadioGroup rg;

    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        builder.setTitle(R.string.settings);
        View view = LayoutInflater.from(getActivity()).inflate(R.layout.settings_dialog, null);

        builder.setView(view);
        builder.setPositiveButton(R.string.save, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       Data.ifMale = ifMale;
                       checkedRadio = rg.getCheckedRadioButtonId();
                       System.out.println("numer radio" +checkedRadio);
                   }
               });
        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // User cancelled the dialog
                   }
               });


        rg = (RadioGroup) view.findViewById(R.id.radio_group);

        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch(checkedId) {
                case R.id.radio_female:
                    //Log.v("RadioGroup", "female");
                    ifMale = false;
                    break;
                case R.id.radio_male:
                    Log.v("RadioGroup","male");
                    ifMale = true;
                    break;
                }
            }
        });
        rg.check(checkedRadio);

        return builder.create();
    }
}

settings_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >
    <RadioGroup  android:id="@+id/radio_group"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">
        <RadioButton android:id="@+id/radio_female"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/female"/>
        <RadioButton android:id="@+id/radio_male"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/male"/>
    </RadioGroup>
</LinearLayout>

Answer 1

您可以使用Shared Preference跟踪已选中的单选按钮的信息，并在下次打开对话框时进行检查。

代码段：

SharedPreferences pref = getApplicationContext().getSharedPreferences("RadioPref", MODE_PRIVATE); 
Editor editor = pref.edit();

//save data in shared preference on button click
builder.setPositiveButton(R.string.save, new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
        Data.ifMale = ifMale;
        checkedRadio = rg.getCheckedRadioButtonId();
        System.out.println("numer radio" +checkedRadio);
        editor.putInt("checkedId", checkedRadio); 
    }
});
//get checkedId from shared preference and check that radion button.
int checkedId = pref.getInt("checkedId", -1);
if(checkedId != -1)
{
    //rg.check(checkedId);
    RadioButton rbutton =(RadioButton)findViewById(checkedId);
    rbutton.setChecked(true);
}

希望这有帮助。

Answer 2

对话框设置代码

    public class SettingsDialogFragment extends DialogFragment{

        private boolean ifMale;
        private int checkedRadio;
        private RadioGroup rg;
        private SharedPreferences pref;

        public Dialog onCreateDialog(Bundle savedInstanceState) {
             pref = getApplicationContext().getSharedPreferences("RadioPref", MODE_PRIVATE);
             Editor editor = pref.edit();

            // Use the Builder class for convenient dialog construction
            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

            builder.setTitle(R.string.settings);
            View view = LayoutInflater.from(getActivity()).inflate(R.layout.settings_dialog, null);

            builder.setView(view);
            builder.setPositiveButton(R.string.save, new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                           Data.ifMale = ifMale;
                           checkedRadio = rg.getCheckedRadioButtonId();
                           System.out.println("numer radio" +checkedRadio);
                       }
                   });
            builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                       public void onClick(DialogInterface dialog, int id) {
                           // User cancelled the dialog
                       }
                   });


            rg = (RadioGroup) view.findViewById(R.id.radio_group);

            rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(RadioGroup group, int checkedId) {
                    switch(checkedId) {
                    case R.id.radio_female:
                        //Log.v("RadioGroup", "female");
                        ifMale = false;
                        checkedRadio = rg.getCheckedRadioButtonId();
                        editor.putInt("checkedId", checkedRadio);
                        break;
                    case R.id.radio_male:
                        Log.v("RadioGroup","male");
                        ifMale = true;
                        checkedRadio = rg.getCheckedRadioButtonId();
                        editor.putInt("checkedId", checkedRadio);
                        break;
                    }
                }
            });
            rg.check(checkedRadio);

            return builder.create();
        }

onStart() {
int id=pref.getInt("checkedId");
rg.check(id);
}
    }

RadioGroup检查对我不起作用

SettingsDialogFragment.java

settings_dialog.xml

2 个答案: