RadioGroup 换行, 支持多行多列
经过反复试验，发现无论你怎么摆弄RadioGroup, 都无法实现多行多列的单选按钮组。
- 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。
- 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。
改写RadioGroup
package com.cop.component_local.view;
import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.util.AttributeSet;
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;
/**
* author: lin
* date: 2018/9/26 18:46
* description: 支持多行多列的RadioGroup，子view不是radioButton的话radiogroup.getChildAt()方法不可用
*/
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);
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;
}
/**
* set the default checked radio button, without notification the listeners
* @param mCheckedId the default checked radio button's id, if none use -1
*/
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 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 getAllRadioButton(View child){
List btns = new ArrayList();
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;
}
/**
* 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()}.
*
* @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);
}
}
/**
* Returns the identifier of the selected radio button in this group.
* Upon empty selection, the returned value is -1.
*
* @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;
}
/**
* Clears the selection. When the selection is cleared, no radio button
* in this group is selected and {@link #getCheckedRadioButtonId()} returns
* null.
*
* @see #check(int)
* @see #getCheckedRadioButtonId()
*/
public void clearCheck() {
check(-1);
}
/**
* Register a callback to be invoked when the checked radio button
* changes in this group.
*
* @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());
}
/**
* 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.
*
* See
* {@link android.R.styleable#LinearLayout_Layout LinearLayout Attributes}
* for a list of all child view attributes that this class supports.
*
*/
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);
}
/**
* 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.
*
* @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;
}
}
}
/**
* Interface definition for a callback to be invoked when the checked
* radio button changed in this group.
*/
public interface OnCheckedChangeListener {
/**
* Called when the checked radio button has changed. When the
* selection is cleared, checkedId is -1.
*
* @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);
}
}
/**
* 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.
*/
private class PassThroughHierarchyChangeListener implements
ViewGroup.OnHierarchyChangeListener {
private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;
/**
* {@inheritDoc}
*/
@SuppressLint("NewApi")
public void onChildViewAdded(View parent, View child) {
if (parent == RadioGroup.this ) {
List 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 == RadioGroup.this) {
List btns = getAllRadioButton(child);
if(btns != null && btns.size() > 0){
for(RadioButton btn : btns){
btn.setOnCheckedChangeListener(null);
}
}
}
if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
}
}
}
}
布局中使用
java代码
@Override
public void initView() {
radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
radioBtn1 = (RadioButton) findViewById(R.id.radioBtn1);
radioBtn2 = (RadioButton) findViewById(R.id.radioBtn2);
radioBtn3 = (RadioButton) findViewById(R.id.radioBtn3);
radioBtn4 = (RadioButton) findViewById(R.id.radioBtn4);
radioGroup.check(R.id.radioBtn1);//默认选中状态
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radbtn = (RadioButton) findViewById(checkedId);
Toast.makeText(getApplicationContext(), "按钮组值发生改变,你选了" + radbtn.getText(), Toast.LENGTH_LONG).show();
}
});
}
得到选中的值
RadioGroup获取选中值
RadioButton 选择改变字体颜色和背景颜色
radiobutton字体颜色改变color_radiobutton.xml
radiobutton背景颜色改变radio_group_selector.xml
动态添加RadioButton
android中radioGroup动态添加radioButton
android java代码中设置radiobutton选中与为选中颜色
Android 动态设置RadioButton选中和没选中的颜色及设置默认选中某一项
https://blog.csdn.net/hongyiandroid/article/details/51800230?locationNum=15&fps=1