1. 如果不结合其他布局，例如LinearLayout, 则只能实现单行多个按钮组，或者单列多个按钮组。
2. 如果结合其他布局， 虽然可以实现多行多列的RadioButton布局，但是，如果不通过一些互斥算法，也无法实现按钮组的单选操作。
所以，我对RadioGroup进行了改写.
Java代码 
- /*
- * Copyright (C) 2006 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * 2013.11.06 updated by xiexiaojian
- * Support that LinearLayouts or RadioButtons can be all RadioGroup's childrens,
- * we can display more rows and columns at the same time.
- */
- package tv.pps.mobile.newipd.version3.custom.view;
- import android.content.Context;
- import android.content.res.TypedArray;
- import android.util.AttributeSet;
- import android.view.MotionEvent;
- import android.view.View;
- import android.view.ViewGroup;
- import android.view.accessibility.AccessibilityEvent;
- import android.view.accessibility.AccessibilityNodeInfo;
- import android.widget.CompoundButton;
- import android.widget.LinearLayout;
- import android.widget.RadioButton;
- /**
- * <p>This class is used to create a multiple-exclusion scope for a set of radio
- * buttons. Checking one radio button that belongs to a radio group unchecks
- * any previously checked radio button within the same group.</p>
- *
- * <p>Intially, all of the radio buttons are unchecked. While it is not possible
- * to uncheck a particular radio button, the radio group can be cleared to
- * remove the checked state.</p>
- *
- * <p>The selection is identified by the unique id of the radio button as defined
- * in the XML layout file.</p>
- *
- * <p><strong>XML Attributes</strong></p>
- * <p>See {@link android.R.styleable#RadioGroup RadioGroup Attributes},
- * {@link android.R.styleable#LinearLayout LinearLayout Attributes},
- * {@link android.R.styleable#ViewGroup ViewGroup Attributes},
- * {@link android.R.styleable#View View Attributes}</p>
- * <p>Also see
- * {@link android.widget.LinearLayout.LayoutParams LinearLayout.LayoutParams}
- * for layout attributes.</p>
- *
- * @see RadioButton
- *
- */
- public class RadioGroup extends LinearLayout {
- // holds the checked id; the selection is empty by default
- private int mCheckedId = -1;
- // tracks children radio buttons checked state
- private CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
- // when true, mOnCheckedChangeListener discards events
- private boolean mProtectFromCheckedChange = false;
- private OnCheckedChangeListener mOnCheckedChangeListener;
- private PassThroughHierarchyChangeListener mPassThroughListener;
- /**
- * {@inheritDoc}
- */
- public RadioGroup(Context context) {
- super(context);
- setOrientation(VERTICAL);
- init();
- }
- /**
- * {@inheritDoc}
- */
- public RadioGroup(Context context, AttributeSet attrs) {
- super(context, attrs);
- mCheckedId = View.NO_ID;
- final int index = VERTICAL;
- setOrientation(index);
- init();
- }
- private void init() {
- mChildOnCheckedChangeListener = new CheckedStateTracker();
- mPassThroughListener = new PassThroughHierarchyChangeListener();
- super.setOnHierarchyChangeListener(mPassThroughListener);
- }
- /**
- * {@inheritDoc}
- */
- @Override
- public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
- // the user listener is delegated to our pass-through listener
- mPassThroughListener.mOnHierarchyChangeListener = listener;
- }
- /**
- * {@inheritDoc}
- */
- @Override
- protected void onFinishInflate() {
- super.onFinishInflate();
- // checks the appropriate radio button as requested in the XML file
- if (mCheckedId != -1) {
- mProtectFromCheckedChange = true;
- setCheckedStateForView(mCheckedId, true);
- mProtectFromCheckedChange = false;
- setCheckedId(mCheckedId);
- }
- }
- @Override
- public void addView(final View child, int index, ViewGroup.LayoutParams params) {
- if (child instanceof RadioButton) {
- ((RadioButton) child).setOnTouchListener(new OnTouchListener() {
- @Override
- public boolean onTouch(View v, MotionEvent event) {
- ((RadioButton) child).setChecked(true);
- checkRadioButton((RadioButton) child);
- if(mOnCheckedChangeListener != null){
- mOnCheckedChangeListener.onCheckedChanged(RadioGroup.this, child.getId());
- }
- return true;
- }
- });
- } else 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;
- ((RadioButton) button).setOnTouchListener(new OnTouchListener() {
- @Override
- public boolean onTouch(View v, MotionEvent event) {
- ((RadioButton) button).setChecked(true);
- checkRadioButton((RadioButton) button);
- if(mOnCheckedChangeListener != null){
- mOnCheckedChangeListener.onCheckedChanged(RadioGroup.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 {
- ((RadioButton) button).setChecked(false);
- }
- }
- }
- }
- }
- }
- /**
- * <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 id the unique id of the radio button to select in this group
- *
- * @see #getCheckedRadioButtonId()
- * @see #clearCheck()
- */
- public void check(int id) {
- // don't even bother
- if (id != -1 && (id == mCheckedId)) {
- return;
- }
- if (mCheckedId != -1) {
- setCheckedStateForView(mCheckedId, false);
- }
- if (id != -1) {
- setCheckedStateForView(id, true);
- }
- setCheckedId(id);
- }
- private void setCheckedId(int id) {
- mCheckedId = id;
- }
- private void setCheckedStateForView(int viewId, boolean checked) {
- View checkedView = findViewById(viewId);
- if (checkedView != null && checkedView instanceof RadioButton) {
- ((RadioButton) 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
- *
- * @see #check(int)
- * @see #clearCheck()
- *
- * @attr ref android.R.styleable#RadioGroup_checkedButton
- */
- public int getCheckedRadioButtonId() {
- return mCheckedId;
- }
- /**
- * <p>Clears the selection. When the selection is cleared, no radio button
- * in this group is selected and {@link #getCheckedRadioButtonId()} returns
- * null.</p>
- *
- * @see #check(int)
- * @see #getCheckedRadioButtonId()
- */
- public void clearCheck() {
- check(-1);
- }
- /**
- * <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(OnCheckedChangeListener listener) {
- mOnCheckedChangeListener = listener;
- }
- /**
- * {@inheritDoc}
- */
- @Override
- public LayoutParams generateLayoutParams(AttributeSet attrs) {
- return new RadioGroup.LayoutParams(getContext(), attrs);
- }
- /**
- * {@inheritDoc}
- */
- @Override
- protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
- return p instanceof RadioGroup.LayoutParams;
- }
- @Override
- protected LinearLayout.LayoutParams generateDefaultLayoutParams() {
- return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
- }
- @Override
- public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
- super.onInitializeAccessibilityEvent(event);
- event.setClassName(RadioGroup.class.getName());
- }
- @Override
- public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
- super.onInitializeAccessibilityNodeInfo(info);
- info.setClassName(RadioGroup.class.getName());
- }
- /**
- * <p>This set of layout parameters defaults the width and the height of
- * the children to {@link #WRAP_CONTENT} when they are not specified in the
- * XML file. Otherwise, this class ussed the value read from the XML file.</p>
- *
- * <p>See
- * {@link android.R.styleable#LinearLayout_Layout LinearLayout Attributes}
- * for a list of all child view attributes that this class supports.</p>
- *
- */
- public static class LayoutParams extends LinearLayout.LayoutParams {
- /**
- * {@inheritDoc}
- */
- public LayoutParams(Context c, AttributeSet attrs) {
- super(c, attrs);
- }
- /**
- * {@inheritDoc}
- */
- public LayoutParams(int w, int h) {
- super(w, h);
- }
- /**
- * {@inheritDoc}
- */
- public LayoutParams(int w, int h, float initWeight) {
- super(w, h, initWeight);
- }
- /**
- * {@inheritDoc}
- */
- public LayoutParams(ViewGroup.LayoutParams p) {
- super(p);
- }
- /**
- * {@inheritDoc}
- */
- public LayoutParams(MarginLayoutParams source) {
- super(source);
- }
- /**
- * <p>Fixes the child's width to
- * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} and the child's
- * height to {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}
- * when not specified in the XML file.</p>
- *
- * @param a the styled attributes set
- * @param widthAttr the width attribute to fetch
- * @param heightAttr the height attribute to fetch
- */
- @Override
- protected void setBaseAttributes(TypedArray a,
- int widthAttr, int heightAttr) {
- if (a.hasValue(widthAttr)) {
- width = a.getLayoutDimension(widthAttr, "layout_width");
- } else {
- width = WRAP_CONTENT;
- }
- if (a.hasValue(heightAttr)) {
- height = a.getLayoutDimension(heightAttr, "layout_height");
- } else {
- height = WRAP_CONTENT;
- }
- }
- }
- /**
- * <p>Interface definition for a callback to be invoked when the checked
- * radio button changed in this group.</p>
- */
- public interface OnCheckedChangeListener {
- /**
- * <p>Called when the checked radio button has changed. When the
- * selection is cleared, checkedId is -1.</p>
- *
- * @param group the group in which the checked radio button has changed
- * @param checkedId the unique identifier of the newly checked radio button
- */
- public void onCheckedChanged(RadioGroup group, int checkedId);
- }
- private class CheckedStateTracker implements CompoundButton.OnCheckedChangeListener {
- public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
- // prevents from infinite recursion
- if (mProtectFromCheckedChange) {
- return;
- }
- mProtectFromCheckedChange = true;
- if (mCheckedId != -1) {
- setCheckedStateForView(mCheckedId, false);
- }
- mProtectFromCheckedChange = false;
- int id = buttonView.getId();
- setCheckedId(id);
- }
- }
- /**
- * <p>A pass-through listener acts upon the events and dispatches them
- * to another listener. This allows the table layout to set its own internal
- * hierarchy change listener without preventing the user to setup his.</p>
- */
- private class PassThroughHierarchyChangeListener implements
- ViewGroup.OnHierarchyChangeListener {
- private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;
- /**
- * {@inheritDoc}
- */
- public void onChildViewAdded(View parent, View child) {
- if (parent == RadioGroup.this && child instanceof RadioButton) {
- int id = child.getId();
- // generates an id if it's missing
- if (id == View.NO_ID) {
- id = child.hashCode();
- child.setId(id);
- }
- ((RadioButton) child).setOnCheckedChangeListener(
- mChildOnCheckedChangeListener);
- }
- if (mOnHierarchyChangeListener != null) {
- mOnHierarchyChangeListener.onChildViewAdded(parent, child);
- }
- }
- /**
- * {@inheritDoc}
- */
- public void onChildViewRemoved(View parent, View child) {
- if (parent == RadioGroup.this && child instanceof RadioButton) {
- ((RadioButton) child).setOnCheckedChangeListener(null);
- }
- if (mOnHierarchyChangeListener != null) {
- mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
- }
- }
- }
- }
其中的这一段是关键改写代码：
Java代码
- @Override
- public void addView(final View child, int index, ViewGroup.LayoutParams params) {
- if (child instanceof RadioButton) {
- ((RadioButton) child).setOnTouchListener(new OnTouchListener() {
- @Override
- public boolean onTouch(View v, MotionEvent event) {
- ((RadioButton) child).setChecked(true);
- checkRadioButton((RadioButton) child);
- if(mOnCheckedChangeListener != null){
- mOnCheckedChangeListener.onCheckedChanged(RadioGroup.this, child.getId());
- }
- return true;
- }
- );
- } else 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;
- ((RadioButton) button).setOnTouchListener(new OnTouchListener() {
- @Override
- public boolean onTouch(View v, MotionEvent event) {
- ((RadioButton) button).setChecked(true);
- checkRadioButton((RadioButton) button);
- if(mOnCheckedChangeListener != null){
- mOnCheckedChangeListener.onCheckedChanged(RadioGroup.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 {
- ((RadioButton) button).setChecked(false);
- }
- }
- }
- }
- }
- }
布局文件我就不贴出来了。
实现结果如下图：
