我需要复选框来保存他们的状态，当我退出应用程序或活动时

Question

所以我需要复选框来保存退出或切换活动时的状态。我需要很多复选框，所以我需要一个适用于所有复选框的函数。请帮忙。

Answer 1

简单的解决方案是使用SharedPreferences，你可以在这里阅读它

法典

在您的活动中创建以下 2 种方法：

private void saveCheckboxesStates(){
SharedPreferences sharedPref =getActivity().getSharedPreferences("fileName",Context.MODE_PRIVATE);//replace fileName with any name you like 
SharedPreferences.Editor editor = sharedPref.edit();
//suppose we have 3 checkboxes that we want to save their states
editor.putBoolean("checkbox1_state", checkBox1.isChecked()));
editor.putBoolean("checkbox2_state", checkBox2.isChecked()));
editor.putBoolean("checkbox3_state", checkBox3.isChecked()));
editor.apply();

}

private void loadCheckboxesStates(){
SharedPreferences sharedPref = getActivity().getSharedPreferences("fileName",Context.MODE_PRIVATE);                  
boolean checkbox1State= sharedPref.getBoolean("checkbox1_state", false);
boolean checkbox2State= sharedPref.getBoolean("checkbox2_state", false);
boolean checkbox3State= sharedPref.getBoolean("checkbox3_state", false); 
checkBox1.setChecked(checkbox1State);
checkBox2.setChecked(checkbox2State);
checkBox3.setChecked(checkbox3State);

}

现在重写onBackPressed和onDestroy方法并像这样调用saveCheckboxesStates：

@Override
public void onBackPressed() {
    super.onBackPressed();
    saveCheckboxesStates();
}//this handle the case when the user clicks back the activity
@Override
public void onDestroy () {
    super.onDestroy();
    saveCheckboxesStates(); 
}//this handle the case when your app gets killed

然后在onCreate方法中调用该方法loadCheckboxesStates，您就完成了。