android百分比布局Eclipse版

【实例简介】eclipse下使用Android百分比布局

【实例截图】

【核心代码】

<android.support.percent.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white" >

    <View
        android:id="@ id/top_left"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentTop="true"
        app:layout_heightPercent="20%"
        app:layout_widthPercent="70%"
        android:background="#ff44aacc" />

    <View
        android:id="@ id/top_right"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@ id/top_left"
        app:layout_heightPercent="20%"
        app:layout_widthPercent="30%"
        android:background="#ffe40000" />

    <android.support.percent.PercentFrameLayout
        android:id="@ id/bottom"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_below="@ id/top_left"
        android:layout_gravity="center"
        app:layout_heightPercent="80%"
        android:background="#ff00ff22" >

        <android.support.percent.PercentLinearLayout
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            app:layout_heightPercent="100%"
            app:layout_marginTopPercent="10%"
            android:background="@android:color/white"
            android:orientation="vertical"
            >
            <View
                android:layout_width="0dp"
                android:layout_height="0dp"
                app:layout_heightPercent="30%"
                app:layout_widthPercent="10%"
                android:background="#ff44ccdd" />
            <View
                android:layout_width="0dp"
                android:layout_height="0dp"
                app:layout_heightPercent="30%"
                app:layout_widthPercent="90%"
                android:background="#ffe400dd" />
            <TextView 
                android:layout_width="0dp"
                 android:layout_height="0dp"
                app:layout_heightPercent="20%"
                app:layout_widthPercent="90%"
                android:background="#ccc"
                android:text="margin 15% of w"
                app:layout_marginPercent="5%h"
                />             
        </android.support.percent.PercentLinearLayout>
    </android.support.percent.PercentFrameLayout>

</android.support.percent.PercentRelativeLayout>

package com.eclipse_android_percent_support;


import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	

}

/*

 * Copyright (C) 2015 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.zhy.android.percent.support;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.content.Context;
import android.content.res.TypedArray;
import android.support.v4.view.MarginLayoutParamsCompat;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.TextView;

import com.example.testpercentextends.R;


/**
 * Helper for layouts that want to support percentage based dimensions.
 * <p/>
 * <p>This class collects utility methods that are involved in extracting percentage based dimension
 * attributes and applying them to ViewGroup's children. If you would like to implement a layout
 * that supports percentage based dimensions, you need to take several steps:
 * <p/>
 * <ol>
 * <li> You need a {@link ViewGroup.LayoutParams} subclass in your ViewGroup that implements
 * {@link com.zhy.android.percent.support.PercentLayoutHelper.PercentLayoutParams}.
 * <li> In your {@code LayoutParams(Context c, AttributeSet attrs)} constructor create an instance
 * of {@link PercentLayoutHelper.PercentLayoutInfo} by calling
 * {@link PercentLayoutHelper#getPercentLayoutInfo(Context, AttributeSet)}. Return this
 * object from {@code public PercentLayoutHelper.PercentLayoutInfo getPercentLayoutInfo()}
 * method that you implemented for {@link com.zhy.android.percent.support.PercentLayoutHelper.PercentLayoutParams} interface.
 * <li> Override
 * {@link ViewGroup.LayoutParams#setBaseAttributes(TypedArray, int, int)}
 * with a single line implementation {@code PercentLayoutHelper.fetchWidthAndHeight(this, a,
 * widthAttr, heightAttr);}
 * <li> In your ViewGroup override {@link ViewGroup#generateLayoutParams(AttributeSet)} to return
 * your LayoutParams.
 * <li> In your {@link ViewGroup#onMeasure(int, int)} override, you need to implement following
 * pattern:
 * <pre class="prettyprint">
 * protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 * mHelper.adjustChildren(widthMeasureSpec, heightMeasureSpec);
 * super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 * if (mHelper.handleMeasuredStateTooSmall()) {
 * super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 * }
 * }
 * </pre>
 * <li>In your {@link ViewGroup#onLayout(boolean, int, int, int, int)} override, you need to
 * implement following pattern:
 * <pre class="prettyprint">
 * protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
 * super.onLayout(changed, left, top, right, bottom);
 * mHelper.restoreOriginalParams();
 * }
 * </pre>
 * </ol>
 */
public class PercentLayoutHelper
{
    private static final String TAG = "PercentLayout";

    private final ViewGroup mHost;

    private static int mWidthScreen;
    private static int mHeightScreen;

    public PercentLayoutHelper(ViewGroup host)
    {
        mHost = host;
        getScreenSize();
    }

    private void getScreenSize()
    {
        WindowManager wm = (WindowManager) mHost.getContext().getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        mWidthScreen = outMetrics.widthPixels;
        mHeightScreen = outMetrics.heightPixels;
    }


    /**
     * Helper method to be called from {@link ViewGroup.LayoutParams#setBaseAttributes} override
     * that reads layout_width and layout_height attribute values without throwing an exception if
     * they aren't present.
     */
    public static void fetchWidthAndHeight(ViewGroup.LayoutParams params, TypedArray array,
                                           int widthAttr, int heightAttr)
    {
        params.width = array.getLayoutDimension(widthAttr, 0);
        params.height = array.getLayoutDimension(heightAttr, 0);
    }

    /**
     * Iterates over children and changes their width and height to one calculated from percentage
     * values.
     *
     * @param widthMeasureSpec  Width MeasureSpec of the parent ViewGroup.
     * @param heightMeasureSpec Height MeasureSpec of the parent ViewGroup.
     */
    public void adjustChildren(int widthMeasureSpec, int heightMeasureSpec)
    {
        if (Log.isLoggable(TAG, Log.DEBUG))
        {
            Log.d(TAG, "adjustChildren: " mHost " widthMeasureSpec: "
                    View.MeasureSpec.toString(widthMeasureSpec) " heightMeasureSpec: "
                    View.MeasureSpec.toString(heightMeasureSpec));
        }
        int widthHint = View.MeasureSpec.getSize(widthMeasureSpec);
        int heightHint = View.MeasureSpec.getSize(heightMeasureSpec);

        if (Log.isLoggable(TAG, Log.DEBUG))
            Log.d(TAG, "widthHint = " widthHint " , heightHint = " heightHint);

        for (int i = 0, N = mHost.getChildCount(); i < N; i )
        {
            View view = mHost.getChildAt(i);
            ViewGroup.LayoutParams params = view.getLayoutParams();

            if (Log.isLoggable(TAG, Log.DEBUG))
            {
                Log.d(TAG, "should adjust " view " " params);
            }

            if (params instanceof PercentLayoutParams)
            {
                PercentLayoutInfo info =
                        ((PercentLayoutParams) params).getPercentLayoutInfo();
                if (Log.isLoggable(TAG, Log.DEBUG))
                {
                    Log.d(TAG, "using " info);
                }
                if (info != null)
                {
                    supportTextSize(widthHint, heightHint, view, info);
                    supportPadding(widthHint, heightHint, view, info);
                    supportMinOrMaxDimesion(widthHint, heightHint, view, info);

                    if (params instanceof ViewGroup.MarginLayoutParams)
                    {
                        info.fillMarginLayoutParams((ViewGroup.MarginLayoutParams) params,
                                widthHint, heightHint);
                    } else
                    {
                        info.fillLayoutParams(params, widthHint, heightHint);
                    }
                }
            }
        }


    }

    private void supportPadding(int widthHint, int heightHint, View view, PercentLayoutInfo info)
    {
        int left = view.getPaddingLeft(), right = view.getPaddingRight(), top = view.getPaddingTop(), bottom = view.getPaddingBottom();
        PercentLayoutInfo.PercentVal percentVal = info.paddingLeftPercent;
        if (percentVal != null)
        {
            int base = getBaseByModeAndVal(widthHint, heightHint, percentVal.basemode);
            left = (int) (base * percentVal.percent);
        }
        percentVal = info.paddingRightPercent;
        if (percentVal != null)
        {
            int base = getBaseByModeAndVal(widthHint, heightHint, percentVal.basemode);
            right = (int) (base * percentVal.percent);
        }

        percentVal = info.paddingTopPercent;
        if (percentVal != null)
        {
            int base = getBaseByModeAndVal(widthHint, heightHint, percentVal.basemode);
            top = (int) (base * percentVal.percent);
        }

        percentVal = info.paddingBottomPercent;
        if (percentVal != null)
        {
            int base = getBaseByModeAndVal(widthHint, heightHint, percentVal.basemode);
            bottom = (int) (base * percentVal.percent);
        }
        view.setPadding(left, top, right, bottom);


    }

    private void supportMinOrMaxDimesion(int widthHint, int heightHint, View view, PercentLayoutInfo info)
    {
        try
        {
            Class clazz = view.getClass();
            invokeMethod("setMaxWidth", widthHint, heightHint, view, clazz, info.maxWidthPercent);
            invokeMethod("setMaxHeight", widthHint, heightHint, view, clazz, info.maxHeightPercent);
            invokeMethod("setMinWidth", widthHint, heightHint, view, clazz, info.minWidthPercent);
            invokeMethod("setMinHeight", widthHint, heightHint, view, clazz, info.minHeightPercent);

        } catch (NoSuchMethodException e)
        {
            e.printStackTrace();
        } catch (InvocationTargetException e)
        {
            e.printStackTrace();
        } catch (IllegalAccessException e)
        {
            e.printStackTrace();
        }

    }

    private void invokeMethod(String methodName, int widthHint, int heightHint, View view, Class clazz, PercentLayoutInfo.PercentVal percentVal) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException
    {
        if (Log.isLoggable(TAG, Log.DEBUG))
            Log.d(TAG, methodName " ==> " percentVal);
        if (percentVal != null)
        {
            Method setMaxWidthMethod = clazz.getMethod(methodName, int.class);
            setMaxWidthMethod.setAccessible(true);
            int base = getBaseByModeAndVal(widthHint, heightHint, percentVal.basemode);
            setMaxWidthMethod.invoke(view, (int) (base * percentVal.percent));
        }
    }

    private void supportTextSize(int widthHint, int heightHint, View view, PercentLayoutInfo info)
    {
        //textsize percent support

        PercentLayoutInfo.PercentVal textSizePercent = info.textSizePercent;
        if (textSizePercent == null) return;

        int base = getBaseByModeAndVal(widthHint, heightHint, textSizePercent.basemode);
        float textSize = (int) (base * textSizePercent.percent);

        //Button 鍜� EditText 鏄疶extView鐨勫瓙绫�
        if (view instanceof TextView)
        {
            ((TextView) view).setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
        }
    }

    private static int getBaseByModeAndVal(int widthHint, int heightHint, PercentLayoutInfo.BASEMODE basemode)
    {
        switch (basemode)
        {
            case BASE_HEIGHT:
                return heightHint;
            case BASE_WIDTH:
                return widthHint;
            case BASE_SCREEN_WIDTH:
                return mWidthScreen;
            case BASE_SCREEN_HEIGHT:
                return mHeightScreen;
        }
        return 0;
    }


    /**
     * Constructs a PercentLayoutInfo from attributes associated with a View. Call this method from
     * {@code LayoutParams(Context c, AttributeSet attrs)} constructor.
     */
    public static PercentLayoutInfo getPercentLayoutInfo(Context context,
                                                         AttributeSet attrs)
    {
        PercentLayoutInfo info = null;
        TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.PercentLayout_Layout);

        info = setWidthAndHeightVal(array, info);

        info = setMarginRelatedVal(array, info);

        info = setTextSizeSupportVal(array, info);

        info = setMinMaxWidthHeightRelatedVal(array, info);

        info = setPaddingRelatedVal(array, info);


        array.recycle();

        if (Log.isLoggable(TAG, Log.DEBUG))
        {
            Log.d(TAG, "constructed: " info);
        }
        return info;
    }

    private static PercentLayoutInfo setWidthAndHeightVal(TypedArray array, PercentLayoutInfo info)
    {
        PercentLayoutInfo.PercentVal percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_widthPercent, true);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent width: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.widthPercent = percentVal;
        }
        percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_heightPercent, false);

        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent height: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.heightPercent = percentVal;
        }

        return info;
    }

    private static PercentLayoutInfo setTextSizeSupportVal(TypedArray array, PercentLayoutInfo info)
    {
        //textSizePercent 榛樿浠ラ珮搴︿綔涓哄熀鍑�
        PercentLayoutInfo.PercentVal percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_textSizePercent, false);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent text size: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.textSizePercent = percentVal;
        }

        return info;
    }

    private static PercentLayoutInfo setMinMaxWidthHeightRelatedVal(TypedArray array, PercentLayoutInfo info)
    {
        //maxWidth
        PercentLayoutInfo.PercentVal percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_maxWidthPercent,
                true);
        if (percentVal != null)
        {
            checkForInfoExists(info);
            info.maxWidthPercent = percentVal;
        }
        //maxHeight
        percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_maxHeightPercent,
                false);
        if (percentVal != null)
        {
            checkForInfoExists(info);
            info.maxHeightPercent = percentVal;
        }
        //minWidth
        percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_minWidthPercent,
                true);
        if (percentVal != null)
        {
            checkForInfoExists(info);
            info.minWidthPercent = percentVal;
        }
        //minHeight
        percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_minHeightPercent,
                false);
        if (percentVal != null)
        {
            checkForInfoExists(info);
            info.minHeightPercent = percentVal;
        }

        return info;
    }

    private static PercentLayoutInfo setMarginRelatedVal(TypedArray array, PercentLayoutInfo info)
    {
        //榛樿margin鍙傝�冨搴�
        PercentLayoutInfo.PercentVal percentVal =
                getPercentVal(array,
                        R.styleable.PercentLayout_Layout_layout_marginPercent,
                        true);

        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent margin: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.leftMarginPercent = percentVal;
            info.topMarginPercent = percentVal;
            info.rightMarginPercent = percentVal;
            info.bottomMarginPercent = percentVal;
        }

        percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_marginLeftPercent, true);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent left margin: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.leftMarginPercent = percentVal;
        }

        percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_marginTopPercent, false);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent top margin: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.topMarginPercent = percentVal;
        }

        percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_marginRightPercent, true);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent right margin: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.rightMarginPercent = percentVal;
        }

        percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_marginBottomPercent, false);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent bottom margin: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.bottomMarginPercent = percentVal;
        }
        percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_marginStartPercent, true);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent start margin: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.startMarginPercent = percentVal;
        }

        percentVal = getPercentVal(array, R.styleable.PercentLayout_Layout_layout_marginEndPercent, true);
        if (percentVal != null)
        {
            if (Log.isLoggable(TAG, Log.VERBOSE))
            {
                Log.v(TAG, "percent end margin: " percentVal.percent);
            }
            info = checkForInfoExists(info);
            info.endMarginPercent = percentVal;
        }

        return info;
    }

    /**
     * 璁剧疆paddingPercent鐩稿叧灞炴��
     *
     * @param array
     * @param info
     */
    private static PercentLayoutInfo setPaddingRelatedVal(TypedArray array, PercentLayoutInfo info)
    {
        //榛樿padding浠ュ搴︿负鏍囧噯
        PercentLayoutInfo.PercentVal percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_paddingPercent,
                true);
        if (percentVal != null)
        {
            info = checkForInfoExists(info);
            info.paddingLeftPercent = percentVal;
            info.paddingRightPercent = percentVal;
            info.paddingBottomPercent = percentVal;
            info.paddingTopPercent = percentVal;
        }


        percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_paddingLeftPercent,
                true);
        if (percentVal != null)
        {
            info = checkForInfoExists(info);
            info.paddingLeftPercent = percentVal;
        }

        percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_paddingRightPercent,
                true);
        if (percentVal != null)
        {
            info = checkForInfoExists(info);
            info.paddingRightPercent = percentVal;
        }

        percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_paddingTopPercent,
                true);
        if (percentVal != null)
        {
            info = checkForInfoExists(info);
            info.paddingTopPercent = percentVal;
        }

        percentVal = getPercentVal(array,
                R.styleable.PercentLayout_Layout_layout_paddingBottomPercent,
                true);
        if (percentVal != null)
        {
            info = checkForInfoExists(info);
            info.paddingBottomPercent = percentVal;
        }

        return info;
    }

    private static PercentLayoutInfo.PercentVal getPercentVal(TypedArray array, int index, boolean baseWidth)
    {
        String sizeStr = array.getString(index);
        PercentLayoutInfo.PercentVal percentVal = getPercentVal(sizeStr, baseWidth);
        return percentVal;
    }


    
    private static PercentLayoutInfo checkForInfoExists(PercentLayoutInfo info)
    {
        info = info != null ? info : new PercentLayoutInfo();
        return info;
    }


    private static final String REGEX_PERCENT = "^(([0-9] )([.]([0-9] ))?|([.]([0-9] ))?)%([s]?[wh]?)$";

    /**
     * widthStr to PercentVal
     * <br/>
     * eg: 35%w => new PercentVal(35, true)
     *
     * @param percentStr
     * @param isOnWidth
     * @return
     */
    private static PercentLayoutInfo.PercentVal getPercentVal(String percentStr, boolean isOnWidth)
    {
        //valid param
        if (percentStr == null)
        {
            return null;
        }
        Pattern p = Pattern.compile(REGEX_PERCENT);
        Matcher matcher = p.matcher(percentStr);
        if (!matcher.matches())
        {
            throw new RuntimeException("the value of layout_xxxPercent invalid! ==>" percentStr);
        }
        int len = percentStr.length();
        //extract the float value
        String floatVal = matcher.group(1);
        String lastAlpha = percentStr.substring(len - 1);

        float percent = Float.parseFloat(floatVal) / 100f;

        PercentLayoutInfo.PercentVal percentVal = new PercentLayoutInfo.PercentVal();
        percentVal.percent = percent;
        if (percentStr.endsWith(PercentLayoutInfo.BASEMODE.SW))
        {
            percentVal.basemode = PercentLayoutInfo.BASEMODE.BASE_SCREEN_WIDTH;
        } else if (percentStr.endsWith(PercentLayoutInfo.BASEMODE.SH))
        {
            percentVal.basemode = PercentLayoutInfo.BASEMODE.BASE_SCREEN_HEIGHT;
        } else if (percentStr.endsWith(PercentLayoutInfo.BASEMODE.PERCENT))
        {
            if (isOnWidth)
            {
                percentVal.basemode = PercentLayoutInfo.BASEMODE.BASE_WIDTH;
            } else
            {
                percentVal.basemode = PercentLayoutInfo.BASEMODE.BASE_HEIGHT;
            }
        } else if (percentStr.endsWith(PercentLayoutInfo.BASEMODE.W))
        {
            percentVal.basemode = PercentLayoutInfo.BASEMODE.BASE_WIDTH;
        } else if (percentStr.endsWith(PercentLayoutInfo.BASEMODE.H))
        {
            percentVal.basemode = PercentLayoutInfo.BASEMODE.BASE_HEIGHT;
        } else
        {
            throw new IllegalArgumentException("the " percentStr " must be endWith [%|w|h|sw|sh]");
        }

        return percentVal;
    }

    /**
     * Iterates over children and restores their original dimensions that were changed for
     * percentage values. Calling this method only makes sense if you previously called
     * {@link PercentLayoutHelper#adjustChildren(int, int)}.
     */

    public void restoreOriginalParams()
    {
        for (int i = 0, N = mHost.getChildCount(); i < N; i )
        {
            View view = mHost.getChildAt(i);
            ViewGroup.LayoutParams params = view.getLayoutParams();
            if (Log.isLoggable(TAG, Log.DEBUG))
            {
                Log.d(TAG, "should restore " view " " params);
            }
            if (params instanceof PercentLayoutParams)
            {
                PercentLayoutInfo info =
                        ((PercentLayoutParams) params).getPercentLayoutInfo();
                if (Log.isLoggable(TAG, Log.DEBUG))
                {
                    Log.d(TAG, "using " info);
                }
                if (info != null)
                {
                    if (params instanceof ViewGroup.MarginLayoutParams)
                    {
                        info.restoreMarginLayoutParams((ViewGroup.MarginLayoutParams) params);
                    } else
                    {
                        info.restoreLayoutParams(params);
                    }
                }
            }
        }
    }

    /**
     * Iterates over children and checks if any of them would like to get more space than it
     * received through the percentage dimension.
     * <p/>
     * If you are building a layout that supports percentage dimensions you are encouraged to take
     * advantage of this method. The developer should be able to specify that a child should be
     * remeasured by adding normal dimension attribute with {@code wrap_content} value. For example
     * he might specify child's attributes as {@code app:layout_widthPercent="60%p"} and
     * {@code android:layout_width="wrap_content"}. In this case if the child receives too little
     * space, it will be remeasured with width set to {@code WRAP_CONTENT}.
     *
     * @return True if the measure phase needs to be rerun because one of the children would like
     * to receive more space.
     */
    public boolean handleMeasuredStateTooSmall()
    {
        boolean needsSecondMeasure = false;
        for (int i = 0, N = mHost.getChildCount(); i < N; i )
        {
            View view = mHost.getChildAt(i);
            ViewGroup.LayoutParams params = view.getLayoutParams();
            if (Log.isLoggable(TAG, Log.DEBUG))
            {
                Log.d(TAG, "should handle measured state too small " view " " params);
            }
            if (params instanceof PercentLayoutParams)
            {
                PercentLayoutInfo info =
                        ((PercentLayoutParams) params).getPercentLayoutInfo();
                if (info != null)
                {
                    if (shouldHandleMeasuredWidthTooSmall(view, info))
                    {
                        needsSecondMeasure = true;
                        params.width = ViewGroup.LayoutParams.WRAP_CONTENT;
                    }
                    if (shouldHandleMeasuredHeightTooSmall(view, info))
                    {
                        needsSecondMeasure = true;
                        params.height = ViewGroup.LayoutParams.WRAP_CONTENT;
                    }
                }
            }
        }
        if (Log.isLoggable(TAG, Log.DEBUG))
        {
            Log.d(TAG, "should trigger second measure pass: " needsSecondMeasure);
        }
        return needsSecondMeasure;
    }

    private static boolean shouldHandleMeasuredWidthTooSmall(View view, PercentLayoutInfo info)
    {
        int state = ViewCompat.getMeasuredWidthAndState(view) & ViewCompat.MEASURED_STATE_MASK;
        if (info == null || info.widthPercent == null)
        {
            return false ;
        }
        return state == ViewCompat.MEASURED_STATE_TOO_SMALL && info.widthPercent.percent >= 0 &&
                info.mPreservedParams.width == ViewGroup.LayoutParams.WRAP_CONTENT;
    }

    private static boolean shouldHandleMeasuredHeightTooSmall(View view, PercentLayoutInfo info)
    {
        int state = ViewCompat.getMeasuredHeightAndState(view) & ViewCompat.MEASURED_STATE_MASK;
        if (info == null || info.heightPercent == null)
        {
           return false ;
        }
        return state == ViewCompat.MEASURED_STATE_TOO_SMALL && info.heightPercent.percent >= 0 &&
                info.mPreservedParams.height == ViewGroup.LayoutParams.WRAP_CONTENT;
    }


    /**
     * Container for information about percentage dimensions and margins. It acts as an extension
     * for {@code LayoutParams}.
     */
    public static class PercentLayoutInfo
    {

        private enum BASEMODE
        {

            BASE_WIDTH, BASE_HEIGHT, BASE_SCREEN_WIDTH, BASE_SCREEN_HEIGHT;

            /**
             * width_parent
             */
            public static final String PERCENT = "%";
            /**
             * width_parent
             */
            public static final String W = "w";
            /**
             * height_parent
             */
            public static final String H = "h";
            /**
             * width_screen
             */
            public static final String SW = "sw";
            /**
             * height_screen
             */
            public static final String SH = "sh";
        }

        public static class PercentVal
        {

            public float percent = -1;
            public BASEMODE basemode;

            public PercentVal()
            {
            }

            public PercentVal(float percent, BASEMODE baseMode)
            {
                this.percent = percent;
                this.basemode = baseMode;
            }

            @Override
            public String toString()
            {
                return "PercentVal{"
                        "percent=" percent
                        ", basemode=" basemode.name()
                        '}';
            }
        }

        public PercentVal widthPercent;
        public PercentVal heightPercent;

        public PercentVal leftMarginPercent;
        public PercentVal topMarginPercent;
        public PercentVal rightMarginPercent;
        public PercentVal bottomMarginPercent;
        public PercentVal startMarginPercent;
        public PercentVal endMarginPercent;

        public PercentVal textSizePercent;

        //1.0.4 those attr for some views' setMax/min Height/Width method
        public PercentVal maxWidthPercent;
        public PercentVal maxHeightPercent;
        public PercentVal minWidthPercent;
        public PercentVal minHeightPercent;

        //1.0.6 add padding supprot
        public PercentVal paddingLeftPercent;
        public PercentVal paddingRightPercent;
        public PercentVal paddingTopPercent;
        public PercentVal paddingBottomPercent;


        /* package */ final ViewGroup.MarginLayoutParams mPreservedParams;


        public PercentLayoutInfo()
        {
            mPreservedParams = new ViewGroup.MarginLayoutParams(0, 0);
        }

        /**
         * Fills {@code ViewGroup.LayoutParams} dimensions based on percentage values.
         */
        public void fillLayoutParams(ViewGroup.LayoutParams params, int widthHint,
                                     int heightHint)
        {
            // Preserve the original layout params, so we can restore them after the measure step.
            mPreservedParams.width = params.width;
            mPreservedParams.height = params.height;

            if (widthPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, widthPercent.basemode);
                params.width = (int) (base * widthPercent.percent);
            }
            if (heightPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, heightPercent.basemode);
                params.height = (int) (base * heightPercent.percent);
            }

            if (Log.isLoggable(TAG, Log.DEBUG))
            {
                Log.d(TAG, "after fillLayoutParams: (" params.width ", " params.height ")");
            }
        }

        /**
         * Fills {@code ViewGroup.MarginLayoutParams} dimensions and margins based on percentage
         * values.
         */
        public void fillMarginLayoutParams(ViewGroup.MarginLayoutParams params, int widthHint,
                                           int heightHint)
        {
            fillLayoutParams(params, widthHint, heightHint);

            // Preserver the original margins, so we can restore them after the measure step.
            mPreservedParams.leftMargin = params.leftMargin;
            mPreservedParams.topMargin = params.topMargin;
            mPreservedParams.rightMargin = params.rightMargin;
            mPreservedParams.bottomMargin = params.bottomMargin;
            MarginLayoutParamsCompat.setMarginStart(mPreservedParams,
                    MarginLayoutParamsCompat.getMarginStart(params));
            MarginLayoutParamsCompat.setMarginEnd(mPreservedParams,
                    MarginLayoutParamsCompat.getMarginEnd(params));

            if (leftMarginPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, leftMarginPercent.basemode);
                params.leftMargin = (int) (base * leftMarginPercent.percent);
            }
            if (topMarginPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, topMarginPercent.basemode);
                params.topMargin = (int) (base * topMarginPercent.percent);
            }
            if (rightMarginPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, rightMarginPercent.basemode);
                params.rightMargin = (int) (base * rightMarginPercent.percent);
            }
            if (bottomMarginPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, bottomMarginPercent.basemode);
                params.bottomMargin = (int) (base * bottomMarginPercent.percent);
            }
            if (startMarginPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, startMarginPercent.basemode);
                MarginLayoutParamsCompat.setMarginStart(params,
                        (int) (base * startMarginPercent.percent));
            }
            if (endMarginPercent != null)
            {
                int base = getBaseByModeAndVal(widthHint, heightHint, endMarginPercent.basemode);
                MarginLayoutParamsCompat.setMarginEnd(params,
                        (int) (base * endMarginPercent.percent));
            }
            if (Log.isLoggable(TAG, Log.DEBUG))
            {
                Log.d(TAG, "after fillMarginLayoutParams: (" params.width ", " params.height
                        ")");
            }
        }

        @Override
        public String toString()
        {
            return "PercentLayoutInfo{"
                    "widthPercent=" widthPercent
                    ", heightPercent=" heightPercent
                    ", leftMarginPercent=" leftMarginPercent
                    ", topMarginPercent=" topMarginPercent
                    ", rightMarginPercent=" rightMarginPercent
                    ", bottomMarginPercent=" bottomMarginPercent
                    ", startMarginPercent=" startMarginPercent
                    ", endMarginPercent=" endMarginPercent
                    ", textSizePercent=" textSizePercent
                    ", maxWidthPercent=" maxWidthPercent
                    ", maxHeightPercent=" maxHeightPercent
                    ", minWidthPercent=" minWidthPercent
                    ", minHeightPercent=" minHeightPercent
                    ", paddingLeftPercent=" paddingLeftPercent
                    ", paddingRightPercent=" paddingRightPercent
                    ", paddingTopPercent=" paddingTopPercent
                    ", paddingBottomPercent=" paddingBottomPercent
                    ", mPreservedParams=" mPreservedParams
                    '}';
        }

        /**
         * Restores original dimensions and margins after they were changed for percentage based
         * values. Calling this method only makes sense if you previously called
         * {@link PercentLayoutHelper.PercentLayoutInfo#fillMarginLayoutParams}.
         */
        public void restoreMarginLayoutParams(ViewGroup.MarginLayoutParams params)
        {
            restoreLayoutParams(params);
            params.leftMargin = mPreservedParams.leftMargin;
            params.topMargin = mPreservedParams.topMargin;
            params.rightMargin = mPreservedParams.rightMargin;
            params.bottomMargin = mPreservedParams.bottomMargin;
            MarginLayoutParamsCompat.setMarginStart(params,
                    MarginLayoutParamsCompat.getMarginStart(mPreservedParams));
            MarginLayoutParamsCompat.setMarginEnd(params,
                    MarginLayoutParamsCompat.getMarginEnd(mPreservedParams));
        }

        /**
         * Restores original dimensions after they were changed for percentage based values. Calling
         * this method only makes sense if you previously called
         * {@link PercentLayoutHelper.PercentLayoutInfo#fillLayoutParams}.
         */
        public void restoreLayoutParams(ViewGroup.LayoutParams params)
        {
            params.width = mPreservedParams.width;
            params.height = mPreservedParams.height;
        }
    }

    /**
     * If a layout wants to support percentage based dimensions and use this helper class, its
     * {@code LayoutParams} subclass must implement this interface.
     * <p/>
     * Your {@code LayoutParams} subclass should contain an instance of {@code PercentLayoutInfo}
     * and the implementation of this interface should be a simple accessor.
     */
    public interface PercentLayoutParams
    {
        PercentLayoutInfo getPercentLayoutInfo();
    }
}