設置單選按鈕值

Question

RadioGroup genderGroup;
RadioButton genderType;
genderGroup = findViewById(R.id.radioGroup);
int id = genderGroup.getCheckedRadioButtonId();
genderType = findViewById(id);

如何為單選按鈕設置單選按鈕的值。 sexType獲取一個值，但我不知道如何將單選按鈕設置為選中狀態

以下代碼是xml文件中使用的代碼

<RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="210dp"
        android:layout_height="63dp"
        android:layout_alignStart="@+id/editTextUsername"
        android:layout_alignTop="@+id/textView6">

        <RadioButton
            android:id="@+id/radioButtonMale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Male" />

        <RadioButton
            android:id="@+id/radioButtonFemale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Female" />
    </RadioGroup>

我想要做的是保存一個選中的單選按鈕，以后再對其進行更新或從數據庫中檢索並顯示它。

謝謝

Answer 1

在獲得通過使用getCheckedRadioButtonId()檢查過的RadioButton id之后，可以將其與2個存在的RadioButton進行比較，並確定哪個是真正檢查過的並保存到數據庫中：

int genderValue = 0;
if (id == R.id.radioButtonMale){
    genderValue = 0;
}else{
    genderValue = 1;
}

//then you can save genderValue to database

//get value from database
int genderValue = ....; //get from database
if (genderValue == 0){
    radioGroup.check(R.id.radioButtonMale);
}else{
    radioGroup.check(R.id.radioButtonFemale);
}

Answer 2

您可以在以下代碼中使用switch ：

   RadioGroup  mRadioGroup = findViewById(R.id.radioGroup);
   RadioButton mRadioBtnmale =  findViewById(R.id.radioButtonMale);
   RadioButton mRadioBtnfemale =  findViewById(R.id.radioButtonFemale);

   mRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
       @Override
       public void onCheckedChanged(RadioGroup group, int checkedId) {
            switch (checkedId){
                  case R.id.radioButtonMale:
                      Toast.makeText(MainActivity.this,"Male selected",Toast.LENGTH_LONG).show();
                break;
                  case R.id.radioButtonFemale:
                      Toast.makeText(MainActivity.this,"FeMale selected",Toast.LENGTH_LONG).show();
            }
       }
   });

如果要顯式設置值，可以這樣做，但是邏輯上應該確定要檢查和取消檢查的值：

   mRadioBtnmale.setChecked(true);
   mRadioBtnmale.setChecked(false);

Answer 3

試試這個代碼--- Main.xml

        <RadioGroup
            android:id="@+id/radioSex"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <RadioButton
                android:id="@+id/radioMale"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/radio_male" 
                android:checked="true" />

            <RadioButton
                android:id="@+id/radioFemale"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/radio_female" />

        </RadioGroup>

Activity.java

        private RadioGroup radioSexGroup;
        private RadioButton radioSexButton;
        private Button btnDisplay;

        @Override
        public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        addListenerOnButton();
        }

        public void addListenerOnButton() {
        radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
        btnDisplay = (Button) findViewById(R.id.btnDisplay);

        btnDisplay.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
        // get selected radio button from radioGroup
        int selectedId = radioSexGroup.getCheckedRadioButtonId();
        // find the radiobutton by returned id
        radioSexButton = (RadioButton) findViewById(selectedId);

        Toast.makeText(MyAndroidAppActivity.this, radioSexButton.getText(), Toast.LENGTH_SHORT).show();
        }
        });
        }