自定義RadioGroup動態新增RadioButton,並獲取選中radioButton的位置
阿新 • • 發佈:2018-12-31
一,自定義的radioGroup,根據專案需求,需要實現考試試卷中單選題形式,其中,在選項前面要有正確答案的提示,例如:(答案)A 選項內容 ,且前面(答案)隱藏,在返回上一題時,正確答案前的這個標誌會顯示出來,所以需要我們自定義控制元件繼承radiogroup,其中每行包含textview ,radiobutton
程式碼如下:
import android.content.Context; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.LinearLayout; import android.widget.RadioButton; import android.widget.RadioGroup; public class MultipleRadioGroup extends RadioGroup { private OnCheckedChangeListener mOnCheckedChangeListener; public MultipleRadioGroup(Context context) { super(context); } public MultipleRadioGroup(Context context, AttributeSet attrs) { super(context, attrs); } public void setOnCheckedChangeListener(OnCheckedChangeListener listener) { mOnCheckedChangeListener = listener; } @Override public void addView(final View child, int index, ViewGroup.LayoutParams params) { if (child instanceof LinearLayout) { int childCount = ((LinearLayout) child).getChildCount(); for (int i = 0; i < childCount; i++) { View view = ((LinearLayout) child).getChildAt(i); if (view instanceof RadioButton) { final RadioButton button = (RadioButton) view; button.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { button.setChecked(true); checkRadioButton(button); if (mOnCheckedChangeListener != null) { mOnCheckedChangeListener.onCheckedChanged(MultipleRadioGroup.this, button.getId()); } return true; } }); } } } super.addView(child, index, params); } private void checkRadioButton(RadioButton radioButton) { View child; int radioCount = getChildCount(); for (int i = 0; i < radioCount; i++) { child = getChildAt(i); if (child instanceof RadioButton) { if (child == radioButton) { // do nothing } else { ((RadioButton) child).setChecked(false); } } else if (child instanceof LinearLayout) { int childCount = ((LinearLayout) child).getChildCount(); for (int j = 0; j < childCount; j++) { View view = ((LinearLayout) child).getChildAt(j); if (view instanceof RadioButton) { final RadioButton button = (RadioButton) view; if (button == radioButton) { // do nothing } else { button.setChecked(false); } } } } } } }
二,實現動態新增該自定義控制元件的每項。
程式碼實現如下:
@BindView(R.id.radioGroup)MultipleRadioGroup radio; int[] drawable = {R.drawable.selector_examination_paper_a, R.drawable.selector_examination_paper_b, R.drawable.selector_examination_paper_c, R.drawable.selector_examination_paper_d, R.drawable.selector_examination_paper_d, R.drawable.selector_examination_paper_d}; for (int i = 0; i < drawable.length; i++) { view = getLayoutInflater().inflate(R.layout.multiple_radio_group_item, null); radioButton = (RadioButton) view.findViewById(R.id.radio_item); radioButton.setButtonDrawable(drawable[i]); radio.addView(view); final int finalI = i; radioButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton compoundButton, boolean b) { if (b) { checkId=finalI; } } }); }
其中drawable對應的radiobutton的圖片用來顯示abcdefg這種選項, 每項item的佈局對應是multiple_radio_group_item.xml檔案。
checkID對應就是使用者選擇第幾個答案的值,注意是從0開始的。
三,附xml檔案
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="40dp" android:orientation="horizontal"> <TextView android:id="@+id/radio_answer" android:layout_width="50dp" android:layout_height="40dp" android:gravity="center" android:text="" /> <RadioButton android:id="@+id/radio_item" android:layout_width="match_parent" android:layout_height="40dp" android:button="@null" android:text="這裡輸入選項" /> </LinearLayout>