Android實現網易雲推薦歌單介面

2022-02-13 19:00:07

前言

關於網易雲音樂推薦歌單介面的實現

一、實現

1.自定義一個圓角圖片控制元件（也可直接使用第三方框架）

由於是一些簡單的繪製，就不一一介紹了，直接上程式碼。

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();
    }
    /**
     * 繪製圓角矩形圖片
     * @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);
        }
    }

    /**
     * 把圖片轉換成Bitmap
     * @param drawable
     * 資源圖片
     * @return 點陣圖
     */
    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);
        //建立需要輸出的bitmap
        Bitmap desBitmap = Bitmap.createBitmap(outWidth, outHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(desBitmap);
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        //著色器
        BitmapShader bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        //給著色器設定matrix
        bitmapShader.setLocalMatrix(matrix);
        paint.setShader(bitmapShader);
        //建立矩形區域並且預留出border
        RectF rect = new RectF(boarder, boarder, outWidth - boarder, outHeight - boarder);
        //把傳入的bitmap繪製到圓角矩形區域內
        canvas.drawRoundRect(rect, radius, radius, paint);
        return desBitmap;
    }



}

效果圖如下：

時間原因，一些簡單的細節沒有畫上去。

2.進行佈局擺設

將整個佈局放在HorizontalScrollView中使其可以左右滑動，以一個item為例。

<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，並無其他作用-->
     <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="計蒙不吃魚"
             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.圖片切換動畫效果

博主使用的是ViewFlipper。
XML程式碼如下

<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>

劃重點：兩個動畫檔案，計蒙偵錯的將近30分鐘才偵錯成類似效果
anim_marquee_in：

<?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：

<?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檔案中為ViewFlipper新增view：

    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);

    // 迴圈捲動圖片的點選事件
    // iv.setOnClickListener(new ....);
    //新增view
    viewFlipper.addView(view);
    viewFlipper.addView(view1);