Android开发自定RadioGroup实现多布局重叠并单选&修改radioButton按钮样式

最近有个需求实现每行二个RadioButton实现两行并单选,在使用radiogroup其中嵌套布局时发现无法单选,只能自定义RadioGroup.查询资料和源码发现其实radioGroup继承的是Linelayout,于是首先继承lineLayout,自定义一个记录一下.

1,首先查找所有radiobutton

private List<RadioButton> getAllRadioButton(View child){
List<RadioButton> btns = new ArrayList<RadioButton>();
if (child instanceof RadioButton) {
btns.add((RadioButton) child);
}else if(child instanceof ViewGroup){
int counts = ((ViewGroup) child).getChildCount();
for(int i = 0; i < counts; i++){
btns.addAll(getAllRadioButton(((ViewGroup) child).getChildAt(i)));
}
}
return btns;
}

2,修改重新方法addView

@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
List<RadioButton> btns = getAllRadioButton(child);
if(btns != null && btns.size() > 0){
for(RadioButton button : btns){
if (button.isChecked()) {
mProtectFromCheckedChange = true;
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;
setCheckedId(button.getId());
}
}
}
super.addView(child, index, params);
}

3,然后在PassThroughHierarchyChangeListener 中修改

@SuppressLint("NewApi")
public void onChildViewAdded(View parent, View child) {
if (parent == MyRadioGroup.this ) {
List<RadioButton> btns = getAllRadioButton(child);
if(btns != null && btns.size() > 0){
for(RadioButton btn : btns){
int id = btn.getId();
// generates an id if it's missing
if (id == View.NO_ID && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
id = View.generateViewId();
btn.setId(id);
}
btn.setOnCheckedChangeListener(
mChildOnCheckedChangeListener);
}
}
}

if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewAdded(parent, child);
}
}

完整代码

public class CustomRadioGroup extends LinearLayout {
private int mCheckedId = -1;
private CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
private boolean mProtectFromCheckedChange = false;
private OnCheckedChangeListener mOnCheckedChangeListener;
private PassThroughHierarchyChangeListener mPassThroughListener;

public CustomRadioGroup(Context context) {
super(context);
setOrientation(VERTICAL);
init();
}

/**
* {@inheritDoc}
*/
public CustomRadioGroup(Context context, AttributeSet attrs) {
super(context, attrs);
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;
}
public void setCheckWithoutNotif(int id){
if (id != -1 && (id == mCheckedId)) {
return;
}

mProtectFromCheckedChange = true;
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}

if (id != -1) {
setCheckedStateForView(id, true);
}

mCheckedId = id;
mProtectFromCheckedChange = false;
}

@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
List<RadioButton> btns = getAllRadioButton(child);
if(btns != null && btns.size() > 0){
for(RadioButton button : btns){
if (button.isChecked()) {
mProtectFromCheckedChange = true;
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;
setCheckedId(button.getId());
}
}
}
super.addView(child, index, params);
}

/**
* get all radio buttons which are in the view
* @param child
*/
private List<RadioButton> getAllRadioButton(View child){
List<RadioButton> btns = new ArrayList<RadioButton>();
if (child instanceof RadioButton) {
btns.add((RadioButton) child);
}else if(child instanceof ViewGroup){
int counts = ((ViewGroup) child).getChildCount();
for(int i = 0; i < counts; i++){
btns.addAll(getAllRadioButton(((ViewGroup) child).getChildAt(i)));
}
}
return btns;
}

/**
* <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;
if (mOnCheckedChangeListener != null) {
mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
}
}

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#MyRadioGroup_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 LayoutParams(getContext(), attrs);
}

/**
* {@inheritDoc}
*/
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof 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(CustomRadioGroup.class.getName());
}

@Override
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setClassName(CustomRadioGroup.class.getName());
}

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 ViewGroup.LayoutParams#WRAP_CONTENT} and the child's
* height to  {@link 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;

c0e6
}

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(CustomRadioGroup 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 OnHierarchyChangeListener {
private OnHierarchyChangeListener mOnHierarchyChangeListener;

/**
* {@inheritDoc}
*/
@SuppressLint("NewApi")
public void onChildViewAdded(View parent, View child) {
if (parent == CustomRadioGroup.this ) {
List<RadioButton> btns = getAllRadioButton(child);
if(btns != null && btns.size() > 0){
for(RadioButton btn : btns){
int id = btn.getId();
// generates an id if it's missing
if (id == View.NO_ID && Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
id = View.generateViewId();
btn.setId(id);
}
btn.setOnCheckedChangeListener(
mChildOnCheckedChangeListener);
}
}
}

if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewAdded(parent, child);
}
}

/**
* {@inheritDoc}
*/
public void onChildViewRemoved(View parent, View child) {
if (parent == CustomRadioGroup.this) {
List<RadioButton> btns = getAllRadioButton(child);
if(btns != null && btns.size() > 0){
for(RadioButton btn : btns){
btn.setOnCheckedChangeListener(null);
}
}
}

if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
}
}
}

RadioButton按钮样式修改:

1,创建状态选择器

<?xml version="1.0" encoding="utf-8"?>
<selectorxmlns:android="http://schemas.android.com/apk/resandroid">
<item android:drawable="@drawable/redio_btn_process" android:state_checked="true" android:state_enabled="true" />
<item android:drawable="@drawable/redio_btn_default" android:state_checked="false" android:state_enabled="false" />
</selector>

2,RadioButton属性 android:button=”@drawable/selected_radio_button_btn”使用状态选择即可

<RadioButton
android:id="@+id/rb_01"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:button="@drawable/selected_radio_button_btn"
android:drawableStart="@mipmap/level01_rb_btn" />