先来看看网易云APP的效果：
前言
关于网易云音乐推荐歌单界面的实现
一、实现
1.自定义一个圆角图片控件（也可直接使用第三方框架）
由于是一些简单的绘制，就不一一介绍了，直接上代码。
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public class MellowImageView extends ImageView { private Paint paint;
public MellowImageView(Context context) { super(context); }
public MellowImageView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); }
public MellowImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); paint=new Paint(); } /** * 绘制圆角矩形图片 * @author jimeng */ @Override protected void onDraw(Canvas canvas) { Drawable drawable = getDrawable(); if (null != drawable) { Bitmap bitmap = getBitmapFromDrawable(drawable); Bitmap b = getRoundBitmapByShader(bitmap,getWidth(),getHeight(), 20,0); final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight()); final Rect rectDest = new Rect(0,0,getWidth(),getHeight());
canvas.drawBitmap(b, rectSrc, rectDest, paint);
} else { super.onDraw(canvas); } }
/** * 把图片转换成Bitmap * @param drawable * 资源图片 * @return 位图 */ public static Bitmap getBitmapFromDrawable(Drawable drawable) { int width = drawable.getIntrinsicWidth(); int height = drawable.getIntrinsicHeight(); Bitmap bitmap = Bitmap.createBitmap(width, height, drawable .getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565); Canvas canvas = new Canvas(bitmap); drawable.draw(canvas); return bitmap; }
public static Bitmap getRoundBitmapByShader(Bitmap bitmap, int outWidth, int outHeight, int radius, int boarder) { if (bitmap == null) { return null; } int width = bitmap.getWidth(); int height = bitmap.getHeight(); float widthScale = outWidth * 1f / width; float heightScale = outHeight * 1f / height;
Matrix matrix = new Matrix(); matrix.setScale(widthScale, heightScale); //创建需要输出的bitmap Bitmap desBitmap = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(desBitmap); Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); //着色器 BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP); //给着色器配置matrix bitmapShader.setLocalMatrix(matrix); paint.setShader(bitmapShader); //创建矩形区域并且预留出border RectF rect = new RectF(boarder, boarder, outWidth - boarder, outHeight - boarder); //把传入的bitmap绘制到圆角矩形区域内 canvas.drawRoundRect(rect, radius, radius, paint); return desBitmap; }
} |
效果图如下：
时间原因，一些简单的细节没有画上去。
2.进行布局摆设
将整个布局放在HorizontalScrollView中使其可以左右滑动，以一个item为例。
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<HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:scrollbars="none" android:orientation="horizontal" > <LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="horizontal"> <!-- 美化，并无其他作用--> <RelativeLayout android:layout_width="@dimen/jimeng_dp_16" android:layout_height="@dimen/jimeng_dp_135"/>
<RelativeLayout android:layout_width="@dimen/jimeng_dp_130" android:layout_height="@dimen/jimeng_dp_135" >
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/like_icon2" android:layout_centerHorizontal="true" android:text="计蒙不吃鱼" android:maxLines="1" android:ellipsize="end" android:textColor="@color/jimeng_black" android:textSize="12.0dip" />
<com.shenzhen.jimeng.jmhnzsb.View.MellowImageView android:id="@+id/like_icon2" android:layout_width="120.0dip" android:layout_height="120.0dip" android:layout_centerHorizontal="true" android:scaleType="centerCrop" android:src="@drawable/yf1" />
</RelativeLayout>
</LinearLayout>
</HorizontalScrollView > |
3.图片切换动画效果
博主使用的是ViewFlipper。
XML代码如下
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content"> <ViewFlipper android:id="@+id/viewFlipper" android:layout_width="120.0dip" android:layout_height="120.0dip" android:flipInterval="3000" android:inAnimation="@anim/anim_marquee_in" android:outAnimation="@anim/anim_marquee_out" /> </RelativeLayout> |
划重点：两个动画文件，计蒙调试的将近30分钟才调试成类似效果
anim_marquee_in：
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<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromYDelta="120%p" android:toYDelta="0"/> <scale android:duration="500" android:fromXScale="0.8" android:fromYScale="0.8" android:toXScale="1" android:toYScale="1" android:pivotY="50%" android:pivotX="50%"/> </set> |
anim_marquee_out：
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<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromYDelta="0" android:toYDelta="-120%p"/> <scale android:duration="500" android:fromXScale="1" android:fromYScale="1" android:toXScale="0.8" android:toYScale="0.8" android:pivotY="50%" android:pivotX="50%">
</scale>
</set |
在Java文件中为ViewFlipper添加view：
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private ViewFlipper viewFlipper; //--------------------------------- viewFlipper.removeAllViews(); View view = View.inflate(getContext(), R.layout.home_rebroadcast_item, null); MellowImageView carouselImageView=view.findViewById(R.id.carousel_item_iv); View view1 = View.inflate(getContext(), R.layout.home_rebroadcast_item1, null); MellowImageView carouselImageView1=view.findViewById(R.id.carousel_item_iv);
// 循环滚动图片的点击事件 // iv.setOnClickListener(new ....); //添加view viewFlipper.addView(view); viewFlipper.addView(view1); |
二、实现效果展示
