android自定义RadioGroup可以添加多种布局的实现方法

android自带的RadioGroup是继承自LinearLayout，如果布局的时候不是直接写radiobutton,即radiobutton外面还包了一层容器，这时分组是不成功的，因为查找不到radiobutton,如果要实现这种效果呢，于是看了RadioGroup的源码，发现问题在于addView方法和自定义的PassThroughHierarchyChangeListener；

下面就这两个地方动手脚，先拷贝源码，然后去掉RadioGroup(Context context, AttributeSet attrs) 中的方法，我新增了一个方法，查找viewGroup控件中的radioButton
代码如下:

    public RadioButton findRadioButton(ViewGroup group) {
        RadioButton resBtn = null;
        int len = group.getChildCount();
        for (int i = 0; i < len; i++) {
            if (group.getChildAt(i) instanceof RadioButton) {
                resBtn = (RadioButton) group.getChildAt(i);
            } else if (group.getChildAt(i) instanceof ViewGroup) {
                findRadioButton((ViewGroup) group.getChildAt(i));
            }
        }
        return resBtn;
    }

addView的实现如下：

代码如下:
@Override
    public void addView(View child, int index, ViewGroup.LayoutParams params) {
        if (child instanceof RadioButton) {
            final RadioButton button = (RadioButton) child;
            if (button.isChecked()) {
                mProtectFromCheckedChange = true;
                if (mCheckedId != -1) {
                    setCheckedStateForView(mCheckedId, false);
                }
                mProtectFromCheckedChange = false;
                setCheckedId(button.getId());
            }
        } else if (child instanceof ViewGroup) {  //这里是我添加的代码
            final RadioButton button = findRadioButton((ViewGroup) child);
            if (button.isChecked()) {
                mProtectFromCheckedChange = true;
                if (mCheckedId != -1) {
                    setCheckedStateForView(mCheckedId, false);
                }
                mProtectFromCheckedChange = false;
                setCheckedId(button.getId());
            }
        }

        super.addView(child, index, params);
    }

然后在自定义的PassThroughHierarchyChangeListener中修改：
代码如下:
private class PassThroughHierarchyChangeListener implements
            ViewGroup.OnHierarchyChangeListener {
        private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;

        public void onChildViewAdded(View parent, View child) {
            if (parent == MyRadioGroup.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);
            } else if (parent == MyRadioGroup.this   //这里是我添加的代码
                    && child instanceof ViewGroup) {
                RadioButton btn = findRadioButton((ViewGroup) child);
                int id = btn.getId();
                // generates an id if it's missing
                if (id == View.NO_ID) {
                    id = btn.hashCode();
                    btn.setId(id);
                }
                btn.setOnCheckedChangeListener(mChildOnCheckedChangeListener);
            }

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

        public void onChildViewRemoved(View parent, View child) {
            if (parent == MyRadioGroup.this && child instanceof RadioButton) {
                ((RadioButton) child).setOnCheckedChangeListener(null);
            } else if (parent == MyRadioGroup.this
                    && child instanceof ViewGroup) {
                findRadioButton((ViewGroup) child).setOnCheckedChangeListener(
                        null);
            }
            if (mOnHierarchyChangeListener != null) {
                mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
            }
        }
    }

做好了上面的步骤，下面布局就可以按照自己的意思来了，并且分组效果也不会影响

下面我的布局文件demo:
代码如下:
<com.huaheng.wy.view.MyRadioGroup
        android:id="@+id/rg"
        android:layout_width="fill_parent"
        android:layout_height="65dp"
        android:layout_alignParentBottom="true"
        android:background="@drawable/yst_i_bottom"
        android:orientation="horizontal" >

        <!-- 首页 -->

        <FrameLayout
            android:id="@+id/left"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1" >

            <RadioButton
                android:id="@+id/rbtn_home"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:background="@null"
                android:button="@null"
                android:drawableTop="@drawable/yst_i_bottomhome_selector"
                android:gravity="center_horizontal"
                android:text="首页"
                android:textColor="@color/white"
                android:textSize="@dimen/font_5" />

            <Button
                android:id="@+id/btn_home_point"
                android:layout_width="21dp"
                android:layout_height="20dp"
                android:layout_gravity="top|right"
                android:layout_marginRight="10dp"
                android:layout_marginTop="0dp"
                android:background="@drawable/notice_bg"
                android:text="1"
                android:textColor="@color/white"
                android:textSize="@dimen/font_6"
                android:visibility="gone" />
        </FrameLayout>
        <!-- 历史 -->

        <RadioButton
            android:id="@+id/rbtn_his"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1"
            android:background="@null"
            android:button="@null"
            android:drawableTop="@drawable/yst_i_bottomhis_selector"
            android:gravity="center_horizontal"
            android:text="历史"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />

        <!-- 扫描 -->

        <Button
            android:id="@+id/rbtn_scan"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:background="@drawable/scan_selector"
            android:button="@null"
            android:gravity="center_horizontal|bottom"
            android:paddingBottom="7dp"
            android:text="扫描"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />

        <RadioButton
            android:id="@+id/rbtn_seek"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1"
            android:background="@null"
            android:button="@null"
            android:drawableTop="@drawable/yst_i_bottomseek_selector"
            android:gravity="center_horizontal"
            android:text="搜索"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />

        <RadioButton
            android:id="@+id/rbtn_more"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="2dp"
            android:layout_marginTop="3dp"
            android:layout_weight="1"
            android:background="@null"
            android:button="@null"
            android:drawableTop="@drawable/yst_i_bottommore_selector"
            android:gravity="center_horizontal"
            android:text="更多"
            android:textColor="@color/white"
            android:textSize="@dimen/font_5" />
    </com.huaheng.wy.view.MyRadioGroup>

所有实现代码都在这里，下面我就把自定义的radioGroup的代码，完整的贴出来
代码如下:

package com.huaheng.wy.view;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CompoundButton;
import android.widget.LinearLayout;
import android.widget.RadioButton;

public class MyRadioGroup 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;

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

    public MyRadioGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        mChildOnCheckedChangeListener = new CheckedStateTracker();
        mPassThroughListener = new PassThroughHierarchyChangeListener();
        super.setOnHierarchyChangeListener(mPassThroughListener);
    }

    @Override
    public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
        // the user listener is delegated to our pass-through listener
        mPassThroughListener.mOnHierarchyChangeListener = listener;
    }

    @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(View child, int index, ViewGroup.LayoutParams params) {
        if (child instanceof RadioButton) {
            final RadioButton button = (RadioButton) child;
            if (button.isChecked()) {
                mProtectFromCheckedChange = true;
                if (mCheckedId != -1) {
                    setCheckedStateForView(mCheckedId, false);
                }
                mProtectFromCheckedChange = false;
                setCheckedId(button.getId());
            }
        } else if (child instanceof ViewGroup) {
            final RadioButton button = findRadioButton((ViewGroup) child);
            if (button.isChecked()) {
                mProtectFromCheckedChange = true;
                if (mCheckedId != -1) {
                    setCheckedStateForView(mCheckedId, false);
                }
                mProtectFromCheckedChange = false;
                setCheckedId(button.getId());
            }
        }

        super.addView(child, index, params);
    }

   
    public RadioButton findRadioButton(ViewGroup group) {
        RadioButton resBtn = null;
        int len = group.getChildCount();
        for (int i = 0; i < len; i++) {
            if (group.getChildAt(i) instanceof RadioButton) {
                resBtn = (RadioButton) group.getChildAt(i);
            } else if (group.getChildAt(i) instanceof ViewGroup) {
                findRadioButton((ViewGroup) group.getChildAt(i));
            }
        }
        return resBtn;
    }

   
    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);
        }
    }

   
    public int getCheckedRadioButtonId() {
        return mCheckedId;
    }

   
    public void clearCheck() {
        check(-1);
    }

   
    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeListener = listener;
    }

   
    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new MyRadioGroup.LayoutParams(getContext(), attrs);
    }

   
    @Override
    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
        return p instanceof MyRadioGroup.LayoutParams;
    }

    @Override
    protected LinearLayout.LayoutParams generateDefaultLayoutParams() {
        return new LayoutParams(LayoutParams.WRAP_CONTENT,
                LayoutParams.WRAP_CONTENT);
    }

   
    public static class LayoutParams extends LinearLayout.LayoutParams {
       
        public LayoutParams(Context c, AttributeSet attrs) {
            super(c, attrs);
        }

       
        public LayoutParams(int w, int h) {
            super(w, h);
        }

       
        public LayoutParams(int w, int h, float initWeight) {
            super(w, h, initWeight);
        }

       
        public LayoutParams(ViewGroup.LayoutParams p) {
            super(p);
        }

       
        public LayoutParams(MarginLayoutParams source) {
            super(source);
        }

       
        @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;
            }
        }
    }

   
    public interface OnCheckedChangeListener {
       
        public void onCheckedChanged(MyRadioGroup 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);
        }
    }

   
    private class PassThroughHierarchyChangeListener implements
            ViewGroup.OnHierarchyChangeListener {
        private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener;

        public void onChildViewAdded(View parent, View child) {
            if (parent == MyRadioGroup.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);
            } else if (parent == MyRadioGroup.this
                    && child instanceof ViewGroup) {
                RadioButton btn = findRadioButton((ViewGroup) child);
                int id = btn.getId();
                // generates an id if it's missing
                if (id == View.NO_ID) {
                    id = btn.hashCode();
                    btn.setId(id);
                }
                btn.setOnCheckedChangeListener(mChildOnCheckedChangeListener);
            }

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

        public void onChildViewRemoved(View parent, View child) {
            if (parent == MyRadioGroup.this && child instanceof RadioButton) {
                ((RadioButton) child).setOnCheckedChangeListener(null);
            } else if (parent == MyRadioGroup.this
                    && child instanceof ViewGroup) {
                findRadioButton((ViewGroup) child).setOnCheckedChangeListener(
                        null);
            }
            if (mOnHierarchyChangeListener != null) {
                mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
            }
        }
    }
}

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