Question

我想在登录活动中默认选中单选按钮作为用户登录，此时自动选中活动按钮设置，当用户进入设置活动然后更改单选按钮选择时，它保存了选择用户在设置活动中选择按钮。

代码：

radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
       //  String radiodefault=R.id.Active;
        @Override

        public void onCheckedChanged(RadioGroup group, int checkedId) {

            // find which radio button is selected

            if(checkedId == R.id.Active) {

                Toast.makeText(getApplicationContext(), "choice: Active",

                        Toast.LENGTH_SHORT).show();
            }

            else if (checkedId == R.id.Inactive)
            {
                Toast.makeText(getApplicationContext(), "choice: Inactive",

                        Toast.LENGTH_SHORT).show();

            }
        }



    });
    active = (RadioButton) findViewById(R.id.Active);

    inactive = (RadioButton) findViewById(R.id.Inactive);

    button = (Button)findViewById(R.id.chooseBtn);

    button.setOnClickListener(new View.OnClickListener() {



        @Override

        public void onClick(View v) {

            int selectedId = radioGroup.getCheckedRadioButtonId();



            // find which radioButton is checked by id

            if(selectedId == active.getId()) {

                Toast.makeText(Settings.this,"Active is selected",Toast.LENGTH_LONG).show();

            }
            else if(selectedId == inactive.getId())
            {

                Toast.makeText(Settings.this,"Inactive is selected",Toast.LENGTH_LONG).show();

Answer 1

您可以使用SharedPreference存储CheckBox的值，然后在重新启动activity时再次加载它。

SharedPreferences preferences = getSharedPreferences("checkBox",MODE_PRIVATE);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putBoolean("Active",active.isChecked());
        editor.putBoolean("InActive",inactive.isChecked());
        editor.apply();

然后在加载活动时将其检索为：

boolean isActive = preferences.getBoolean("Active",false);
boolean isInActvie = preferences.getBoolean("InActive",false);

然后，您可以设置CheckBox的当前状态，如：

active.setChecked(isActive);
inactive.setChecked(isInActive);

Answer 2

使用SharedPreference存储已检查为默认值

如何在其他活动中设置单选按钮默认值？

2 个答案: