保存状态的单选按钮和值单选、按钮、状态
在主要活动，我有单选按钮，在方法公共无效onRadioButtonClicked（查看视图）我用值来选择每个单选按钮关联，所以我有两个变量a和b，在那之后我按一下按钮bton我根据该方法ajouter有，a和b的值到database.Until现在一切都奥基，我决定使用OnResume和将OnPause方法来拯救活动的状态，所以当我返回到活动我看到单选按钮选择，问题就来了，当我点击按钮保存信息，我得到0的，我看到所选值A和B的数据库，而不是价值，而奇怪的是，当我再次点击放入系统单选按钮，之后在保存按钮，我得到了正确的价值观！在这里我的问题是如何使a和b的值，而对所选择的单选按钮再次点击？
公共类ActivityUn延伸活动{
公共无效ajouter（视图v）{
db.open（）;
db.insertMENAGE（A，B）;
db.close（）;
Toast.makeText（getApplicationContext（），DonnéesEnregistrées，Toast.LENGTH_SHORT）.show（）;
}
@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_un）;
按钮bton =（按钮）findViewById（R.id.ajoutUn）;
bton.setOnClickListener（新View.OnClickListener（）{
@覆盖
公共无效的onClick（视图v）{
ajouter（五）; }
}）;
公共无效onRadioButtonClicked（查看视图）{
//是按钮现在检查？
布尔查=（（单选）查看）.isChecked（）;
//检查哪个单选按钮被点击
开关（view.getId（））{
案例R.id.rm_13_1：
如果（检查）
一个= 1;
打破;
案例R.id.rm_13_2：
如果（检查）
一个= 2;
打破;
案例R.id.rm_14_1：
如果（检查）
B = 1;
打破;
案例R.id.rm_14_2：
如果（检查）
B = 2;
打破;
案例R.id.rm_14_3：
如果（检查）
B = 3;
findViewById
打破;
案例R.id.rm_14_4：
如果（检查）
B = 4;
打破;
}
}
@覆盖
保护无效的onPause（）{
super.onPause（）;
共享preferences prefs3 = getShared preferences（preFS_NAME，
MODE_PRIVATE）;
共享preferences.Editor编辑器= prefs3.edit（）;
editor.putBoolean（questionA，rm_13_1.isChecked（））;
editor.putBoolean（questionB，rm_13_2.isChecked（））;
editor.putBoolean（questionC，rm_14_1.isChecked（））;
editor.putBoolean（questionD，rm_14_2.isChecked（））;
editor.putBoolean（questionE，rm_14_3.isChecked（））;
editor.commit（）;
}
@覆盖
保护无效onResume（）{
super.onResume（）;
共享preferences prefs3 = getShared preferences（preFS_NAME，MODE_PRIVATE）;
rm_13_1 =（单选）findViewById（R.id.rm_13_1）;
rm_13_2 =（单选）findViewById（R.id.rm_13_2）;
rm_14_1 =（单选）findViewById（R.id.rm_14_1）;
rm_14_2 =（单选）findViewById（R.id.rm_14_2）;
rm_14_3 =（单选）findViewById（R.id.rm_14_2）;
布尔rm_13_1A = FALSE;
布尔rm_13_2A = FALSE;
布尔rm_14_1A = FALSE;
布尔rm_14_2A = FALSE;
布尔rm_14_3A = FALSE;
rm_13_1A = prefs3.getBoolean（questionA，假）;
rm_13_2A = prefs3.getBoolean（questionB，假）;
rm_14_1A = prefs3.getBoolean（questionC，假）;
rm_14_2A = prefs3.getBoolean（questionD，假）;
rm_14_3A = prefs3.getBoolean（questionE，假）;
rm_13_1.setChecked（rm_13_1A）;
rm_13_2.setChecked（rm_13_2A）;
rm_14_1.setChecked（rm_14_1A）;
rm_14_2.setChecked（rm_14_2A）;
rm_14_3.setChecked（rm_14_3A）;
}
解决方案
单选按钮应该只存在于一个单选按钮组。的单选按钮的特性是，只有一个在一组，可在一个时间进行选择。如果用户选择C，则所有其他的单选按钮变成取消（想想选择题只能选择一个答案。）如果你正在寻找有选择多个选项，看看Android的的复选框观点
in the main activity i have radio buttons , in the method public void onRadioButtonClicked(View view) i associate each radio button selected with a value, so i have two variables a and b, after that i click on the button bton i have according to the method ajouter, a and b values into database.Until now everything is okey, i decide to use OnResume and OnPause methods to save the state of activity, so when i return to the activity i see that the radio buttons are selected, the problem comes when i click on button to save info , i get 0 as value for a and b in database instead of values that i saw selected, and the weird thing is that when i click again on thoses radio buttons and after that on save button, i get the right values ! My question here is how to make values of a and b without clicking again on the selected Radio Buttons ?
public class ActivityUn extends Activity {
public void ajouter(View v) {
db.open();
db.insertMENAGE(a,b);
db.close();
Toast.makeText(getApplicationContext(), "Données Enregistrées",Toast.LENGTH_SHORT).show();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_un);
Button bton = (Button)findViewById(R.id.ajoutUn);
bton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ajouter(v); }
});
public void onRadioButtonClicked(View view) {
// Is the button now checked?
boolean checked = ((RadioButton) view).isChecked();
// Check which radio button was clicked
switch(view.getId()) {
case R.id.rm_13_1:
if (checked)
a=1;
break;
case R.id.rm_13_2:
if (checked)
a=2;
break;
case R.id.rm_14_1:
if (checked)
b=1;
break;
case R.id.rm_14_2:
if (checked)
b=2;
break;
case R.id.rm_14_3:
if (checked)
b=3;
findViewById
break;
case R.id.rm_14_4:
if (checked)
b=4;
break;
}
}
@Override
protected void onPause() {
super.onPause();
SharedPreferences prefs3 = getSharedPreferences(PREFS_NAME,
MODE_PRIVATE);
SharedPreferences.Editor editor = prefs3.edit();
editor.putBoolean("questionA", rm_13_1.isChecked());
editor.putBoolean("questionB", rm_13_2.isChecked());
editor.putBoolean("questionC", rm_14_1.isChecked());
editor.putBoolean("questionD", rm_14_2.isChecked());
editor.putBoolean("questionE", rm_14_3.isChecked());
editor.commit();
}
@Override
protected void onResume() {
super.onResume();
SharedPreferences prefs3 = getSharedPreferences(PREFS_NAME,MODE_PRIVATE);
rm_13_1 = (RadioButton) findViewById(R.id.rm_13_1);
rm_13_2 = (RadioButton) findViewById(R.id.rm_13_2);
rm_14_1 = (RadioButton) findViewById(R.id.rm_14_1);
rm_14_2 = (RadioButton) findViewById(R.id.rm_14_2);
rm_14_3 = (RadioButton) findViewById(R.id.rm_14_2);
Boolean rm_13_1A = false;
Boolean rm_13_2A = false;
Boolean rm_14_1A = false;
Boolean rm_14_2A = false;
Boolean rm_14_3A = false;
rm_13_1A = prefs3.getBoolean("questionA", false);
rm_13_2A = prefs3.getBoolean("questionB", false);
rm_14_1A = prefs3.getBoolean("questionC", false);
rm_14_2A = prefs3.getBoolean("questionD", false);
rm_14_3A = prefs3.getBoolean("questionE", false);
rm_13_1.setChecked(rm_13_1A);
rm_13_2.setChecked(rm_13_2A);
rm_14_1.setChecked(rm_14_1A);
rm_14_2.setChecked(rm_14_2A);
rm_14_3.setChecked(rm_14_3A);
}
解决方案
Radio buttons should only exist in a radio button group. The characteristics of radio buttons is that only one in a group can be selected at a time. If a user selects C then all the other radio buttons become deselected (Think of a multiple choice question. You can only select one answer) If you're looking to have multiple options selected, look into android's CheckBox view
