Đây là giải pháp của tôi dựa trên giải pháp @lostdev và việc triển khai RadioGroup. Đó là một RadioGroup được sửa đổi để hoạt động với RadioButtons (hoặc các CompoundButtons khác) được lồng vào bên trong các bố cục con.
import android.content.Context;
import android.os.Build;
import android.support.annotation.IdRes;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import java.util.concurrent.atomic.AtomicInteger;
/**
* This class is a replacement for android RadioGroup - it supports
* child layouts which standard RadioGroup doesn't.
*/
public class RecursiveRadioGroup extends LinearLayout {
public interface OnCheckedChangeListener {
void onCheckedChanged(RecursiveRadioGroup group, @IdRes int checkedId);
}
/**
* For generating unique view IDs on API < 17 with {@link #generateViewId()}.
*/
private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
private CompoundButton checkedView;
private CompoundButton.OnCheckedChangeListener childOnCheckedChangeListener;
/**
* When this flag is true, onCheckedChangeListener discards events.
*/
private boolean mProtectFromCheckedChange = false;
private OnCheckedChangeListener onCheckedChangeListener;
private PassThroughHierarchyChangeListener mPassThroughListener;
public RecursiveRadioGroup(Context context) {
super(context);
setOrientation(HORIZONTAL);
init();
}
public RecursiveRadioGroup(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public RecursiveRadioGroup(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
childOnCheckedChangeListener = new CheckedStateTracker();
mPassThroughListener = new PassThroughHierarchyChangeListener();
super.setOnHierarchyChangeListener(mPassThroughListener);
}
@Override
public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
mPassThroughListener.mOnHierarchyChangeListener = listener;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
// checks the appropriate radio button as requested in the XML file
if (checkedView != null) {
mProtectFromCheckedChange = true;
setCheckedStateForView(checkedView, true);
mProtectFromCheckedChange = false;
setCheckedView(checkedView);
}
}
@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
parseChild(child);
super.addView(child, index, params);
}
private void parseChild(final View child) {
if (child instanceof CompoundButton) {
final CompoundButton checkable = (CompoundButton) child;
if (checkable.isChecked()) {
mProtectFromCheckedChange = true;
if (checkedView != null) {
setCheckedStateForView(checkedView, false);
}
mProtectFromCheckedChange = false;
setCheckedView(checkable);
}
} else if (child instanceof ViewGroup) {
parseChildren((ViewGroup) child);
}
}
private void parseChildren(final ViewGroup child) {
for (int i = 0; i < child.getChildCount(); i++) {
parseChild(child.getChildAt(i));
}
}
/**
* <p>Sets the selection to the radio button whose identifier is passed in
* parameter. Using -1 as the selection identifier clears the selection;
* such an operation is equivalent to invoking {@link #clearCheck()}.</p>
*
* @param view the radio button to select in this group
* @see #getCheckedItemId()
* @see #clearCheck()
*/
public void check(CompoundButton view) {
if(checkedView != null) {
setCheckedStateForView(checkedView, false);
}
if(view != null) {
setCheckedStateForView(view, true);
}
setCheckedView(view);
}
private void setCheckedView(CompoundButton view) {
checkedView = view;
if(onCheckedChangeListener != null) {
onCheckedChangeListener.onCheckedChanged(this, checkedView.getId());
}
}
private void setCheckedStateForView(View checkedView, boolean checked) {
if (checkedView != null && checkedView instanceof CompoundButton) {
((CompoundButton) checkedView).setChecked(checked);
}
}
/**
* <p>Returns the identifier of the selected radio button in this group.
* Upon empty selection, the returned value is -1.</p>
*
* @return the unique id of the selected radio button in this group
* @attr ref android.R.styleable#RadioGroup_checkedButton
* @see #check(CompoundButton)
* @see #clearCheck()
*/
@IdRes
public int getCheckedItemId() {
return checkedView.getId();
}
public CompoundButton getCheckedItem() {
return checkedView;
}
/**
* <p>Clears the selection. When the selection is cleared, no radio button
* in this group is selected and {@link #getCheckedItemId()} returns
* null.</p>
*
* @see #check(CompoundButton)
* @see #getCheckedItemId()
*/
public void clearCheck() {
check(null);
}
/**
* <p>Register a callback to be invoked when the checked radio button
* changes in this group.</p>
*
* @param listener the callback to call on checked state change
*/
public void setOnCheckedChangeListener(RecursiveRadioGroup.OnCheckedChangeListener listener) {
onCheckedChangeListener = listener;
}
/**
* Generate a value suitable for use in {@link #setId(int)}.
* This value will not collide with ID values generated at build time by aapt for R.id.
*
* @return a generated ID value
*/
public static int generateViewId() {
for (; ; ) {
final int result = sNextGeneratedId.get();
// aapt-generated IDs have the high byte nonzero; clamp to the range under that.
int newValue = result + 1;
if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
if (sNextGeneratedId.compareAndSet(result, newValue)) {
return result;
}
}
}
private class CheckedStateTracker implements CompoundButton.OnCheckedChangeListener {
@Override
public void onCheckedChanged(CompoundButton view, boolean b) {
if (mProtectFromCheckedChange) {
return;
}
mProtectFromCheckedChange = true;
if (checkedView != null) {
setCheckedStateForView(checkedView, false);
}
mProtectFromCheckedChange = false;
int id = view.getId();
setCheckedView(view);
}
}
private class PassThroughHierarchyChangeListener implements OnHierarchyChangeListener {
private OnHierarchyChangeListener mOnHierarchyChangeListener;
@Override
public void onChildViewAdded(View parent, View child) {
if (child instanceof CompoundButton) {
int id = child.getId();
if (id == View.NO_ID) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) {
child.setId(generateViewId());
} else {
child.setId(View.generateViewId());
}
}
((CompoundButton) child).setOnCheckedChangeListener(childOnCheckedChangeListener);
if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewAdded(parent, child);
}
} else if(child instanceof ViewGroup) {
// View hierarchy seems to be constructed from the bottom up,
// so all child views are already added. That's why we
// manually call the listener for all children of ViewGroup.
for(int i = 0; i < ((ViewGroup) child).getChildCount(); i++) {
onChildViewAdded(child, ((ViewGroup) child).getChildAt(i));
}
}
}
@Override
public void onChildViewRemoved(View parent, View child) {
if (child instanceof RadioButton) {
((CompoundButton) child).setOnCheckedChangeListener(null);
}
if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
}
}
}
}
Bạn có thể sử dụng nó trong bố cục của mình giống như cách bạn làm RadioGroupvới thông thường ngoại trừ nó cũng hoạt động với các dạng RadioButtonxem lồng nhau :
<RecursiveRadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginBottom="16dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:orientation="horizontal">
<LinearLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical">
<RadioButton
android:id="@+id/rbNotEnoughProfileInfo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Not enough profile information"/>
<RadioButton
android:id="@+id/rbNotAGoodFit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Not a good fit"/>
<RadioButton
android:id="@+id/rbDatesNoLongerAvailable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dates no longer available"/>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<RadioButton
android:id="@+id/rbOther"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Other"/>
<android.support.v7.widget.AppCompatEditText
android:id="@+id/etReason"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/tvMessageError"
android:textSize="15sp"
android:gravity="top|left"
android:hint="Tell us more"
android:padding="16dp"
android:background="@drawable/edit_text_multiline_background"/>
</LinearLayout>
</RecursiveRadioGroup>