安卓侧边栏实现

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安卓侧边栏实现

上一篇写的是侧滑布局,虽然有侧滑效果,但是没有阴影,效果不是很好
这一次我们来为布局加上阴影
这里写图片描述

package xiaolin.widget;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.util.AttributeSet;/** * 标准侧边栏 * Created by XiaoLin on 2016/1/14. */public class ASlidingLayout extends ATranslationLayout {    public static final String TAG = "ASlidingLayer";    public ASlidingLayout(Context context) {        super(context);    }    public ASlidingLayout(Context context, AttributeSet attrs) {        super(context, attrs);    }    public ASlidingLayout(Context context, AttributeSet attrs, int theme) {        super(context, attrs, theme);    }    @Override    protected void dispatchDraw(Canvas canvas) {        canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG                | Paint.FILTER_BITMAP_FLAG));// 画布抗锯齿        int x = getScrollX();        if (x == 0) {            super.dispatchDraw(canvas);            return;        }        int alpha = 150 * -x / menuWidth;        canvas.save();        canvas.translate(x, 0);        super.dispatchDraw(canvas);        canvas.drawColor((Color.BLACK & 0xffffff) + alpha * 0x1000000);        canvas.restore();        canvas.save();        canvas.clipRect(x, 0, 0, this.getHeight());        super.dispatchDraw(canvas);        canvas.restore();    }}

ATranslationLayout请擢这里
用法还是和侧滑布局一样,在里面添加一个或两个View就行了

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#cacaca">    <xiaolin.widget.ASlidingLayout        android:layout_width="match_parent"        android:layout_height="match_parent">        <ImageView            android:layout_width="match_parent"            android:layout_height="match_parent"            android:scaleType="centerCrop"            android:src="@drawable/bg" />    </xiaolin.widget.ASlidingLayout></LinearLayout>

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