Android 上滑上拉菜單SlidingDrawer 不全屏顯示的方法

這裏來講一個已經被廢棄的SlidingDrawer.. 他能夠實現上拉，下拉的菜單。 可是有個問題就是上拉之後，是全屏顯示的。

首先 寫一個佈局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#eeeeee"
    tools:context="com.wingsofts.slidingdrawer.MainActivity">
<SlidingDrawer
    android:content="@+id/content"
    android:handle="@+id/handle"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/handle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <View
        android:id="@+id/content"
        android:background="#ac2d9a"
        android:layout_width="match_parent"
        android:layout_height="300dp"/>
</SlidingDrawer>
</RelativeLayout>

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而後運行效果是這樣的： 

誒。。怎麼不對！！！ 我菜單寫的高度是300啊。。 
而後試試wrap_content,仍是不行。。 
那麼該怎麼辦呢。。。 stackoverflow上面有大神給出了答案。 
即：重寫SlidingDrawer的onMeasure方法，讓他支持wrap_content；

新建類以下：

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.SlidingDrawer;


public class WrappingSlidingDrawer extends SlidingDrawer {

    public WrappingSlidingDrawer(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        int orientation = attrs.getAttributeIntValue("android", "orientation", ORIENTATION_VERTICAL);
        mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);
        mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);
    }

    public WrappingSlidingDrawer(Context context, AttributeSet attrs) {
        super(context, attrs);

        int orientation = attrs.getAttributeIntValue("android", "orientation", ORIENTATION_VERTICAL);
        mTopOffset = attrs.getAttributeIntValue("android", "topOffset", 0);
        mVertical = (orientation == SlidingDrawer.ORIENTATION_VERTICAL);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthSpecSize =  MeasureSpec.getSize(widthMeasureSpec);

        int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
        int heightSpecSize =  MeasureSpec.getSize(heightMeasureSpec);

        if (widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED) {
            throw new RuntimeException("SlidingDrawer cannot have UNSPECIFIED dimensions");
        }

        final View handle = getHandle();
        final View content = getContent();
        measureChild(handle, widthMeasureSpec, heightMeasureSpec);

        if (mVertical) {
            int height = heightSpecSize - handle.getMeasuredHeight() - mTopOffset;
            content.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(height, heightSpecMode));
            heightSpecSize = handle.getMeasuredHeight() + mTopOffset + content.getMeasuredHeight();
            widthSpecSize = content.getMeasuredWidth();
            if (handle.getMeasuredWidth() > widthSpecSize) widthSpecSize = handle.getMeasuredWidth();
        }
        else {
            int width = widthSpecSize - handle.getMeasuredWidth() - mTopOffset;
            getContent().measure(MeasureSpec.makeMeasureSpec(width, widthSpecMode), heightMeasureSpec);
            widthSpecSize = handle.getMeasuredWidth() + mTopOffset + content.getMeasuredWidth();
            heightSpecSize = content.getMeasuredHeight();
            if (handle.getMeasuredHeight() > heightSpecSize) heightSpecSize = handle.getMeasuredHeight();
        }

        setMeasuredDimension(widthSpecSize, heightSpecSize);
    }

    private boolean mVertical;
    private int mTopOffset;
}

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這裏，再把Slidingdrawer外面包裹一個LinearLayout,再把其高度設置爲wrap_content便可，注意android:gravity=」bottom」。

修改後的佈局文件以下:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#eeeeee"
    tools:context="com.wingsofts.slidingdrawer.MainActivity">
    <LinearLayout
        android:gravity="bottom"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <com.wingsofts.slidingdrawer.WrappingSlidingDrawer
            android:content="@+id/content"
            android:handle="@+id/handle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <Button
                android:id="@+id/handle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
            <LinearLayout

                android:id="@+id/content"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <View
                    android:background="#ac2d9a"
                    android:layout_width="match_parent"
                    android:layout_height="300dp"/>
            </LinearLayout>

        </com.wingsofts.slidingdrawer.WrappingSlidingDrawer>
    </LinearLayout>

</RelativeLayout>

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大功告成！！ 看效果： 

stackoverflow連接：http://stackoverflow.com/questions/3654492/android-can-height-of-slidingdrawer-be-set-with-wrap-content/4265553#4265553