发布于 2016-02-23 09:28:43 | 193 次阅读 | 评论: 0 | 来源: 网友投递

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Android移动端操作系统

Android是一种基于Linux的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由Google公司和开放手机联盟领导及开发。尚未有统一中文名称,中国大陆地区较多人使用“安卓”或“安致”。


这篇文章介绍了android自定义RadioGroup可以添加多种布局的实现方法,有需要的朋友可以参考一下

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


/** 查找radioButton控件 */
    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:


@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:

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:


<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

/*
 * 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.
 */

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);     }

    /** 查找radioButton控件 */     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;     }

    /**      * <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()      */     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 MyRadioGroup.LayoutParams(getContext(), attrs);     }

    /**      * {@inheritDoc}      */     @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);     }

    /**      * <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(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);         }     }

    /**      * <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;

        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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