[移动开发]android：一套默认头像的封装

写这个是在项目迭代的时候遇到的，一开始都是圆形的头像，今天突然说～要把所有的头像改成圆角矩形....

我一开始没注意到这个，就把所有有关头像调用的部分整合了一下

如图～

那就不多bb了。直接上代码

这是一个形状的分类?

public class HeaderShap {

    /*
    * 圆形，上下文，文本组件，图片链接
    * */
    public void ShapCircle(Context context, TextView tv_default, ImageView iv_avatar, String avatar) {
        RequestOptions options = RequestOptions.bitmapTransform(new CropCircleTransformation());
        glide(context,tv_default,iv_avatar,avatar,options);
    }
    /*
     * 圆角矩形，上下文，文本组件，图片链接
     * */
    public void ShapRounded(Context context, TextView tv_default, ImageView iv_avatar, String avatar) {
        //RequestOptions options =  RequestOptions.bitmapTransform(new RoundedCorners(20));

        //第一个是上下文，第二个是圆角的弧度
        RequestOptions options = new RequestOptions()
                .transform(new GlideRoundTransform(context,20));

        glide(context,tv_default,iv_avatar,avatar,options);
    }

    //共同部分的代码封装一下
    private void glide(Context context, TextView tv_default, ImageView iv_avatar, String avatar,RequestOptions options){

        Glide.with(context)
                .load(avatar)
                //.placeholder(R.drawable.ic_default_image)
                .error(R.drawable.default_avatar_background)
                .apply(options)
                .listener(new RequestListener<Drawable>() {
                    @Override
                    public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {
                        tv_default.setVisibility(View.VISIBLE);
                        return false;
                    }
                    @Override
                    public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource
                            dataSource, boolean isFirstResource) {
                        tv_default.setVisibility(View.INVISIBLE);
                        return false;
                    }
                })
                .into(iv_avatar);
    }

    /*
     * 标准矩形，上下文，文本组件，图片链接
     * */
    public void ShapRectangle(Context context, TextView tv_default, ImageView iv_avatar, String avatar) {
        RequestOptions options = RequestOptions.bitmapTransform(new RoundedCorners(0));
        glide(context, tv_default, iv_avatar, avatar, options);
    }
}

继承glide自定义的样式，不用这个设置矩形的话，会被缩放，显示的不是矩形，会显示成圆角的缩放图，如果原图是长方形，那就是长方行圆角～这么讲能理解吧

public class GlideRoundTransform extends BitmapTransformation {
 
    private static float radius = 0f;
 
    public GlideRoundTransform(Context context) {
        this(context, 4);
    }
 
    public GlideRoundTransform(Context context, int dp) {
        super();
        this.radius = dp;
        //this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }
 
    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        Bitmap bitmap = TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight);
        return roundCrop(pool, bitmap);
    }
 
    private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;
 
        Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        }
 
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return result;
    }
 
    public String getId() {
        return getClass().getName() + Math.round(radius);
    }
 
    @Override
    public void updateDiskCacheKey(MessageDigest messageDigest) {
 
    }
 
}

?默认的圆角图，颜色自己改一下，我是根据主题色来的

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <shape
            android:shape="rectangle">
            <solid android:color="@color/color_theme"/>
            <corners android:radius="10dp"/>
            <stroke
                android:width="0.5dp"
                android:color="@color/color_theme"/>
        </shape>
    </item>
    </layer-list>

最后就是调用了

第一个参数是上下文，第二个是默认会显示的昵称，第三个是显示图片的控件，第四个是图片地址（如果没有，显示的就是默认的）

HeaderShap shap = new HeaderShap();
shap.ShapRounded(context,tv_udefault_avatar,iv_avatar,avatar);

最后头像的xml也发一下吧，这个其实很简单，imagview显示的是默认，昵称和将要显示的图片都暂时隐藏，没有图片地址的时候，昵称会显示，就和钉钉那种差不多，这篇文章，上半年我是写过，只是没封装，简单使用，各位可以向上翻看一下～

    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/ll_avatar"
    android:background="#00000000"
        android:layout_width="40dp"
        android:layout_height="40dp">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="40dp"
        android:layout_height="40dp">
    <TextView
        android:id="@+id/user_id"
        android:layout_width="0dp"
        android:layout_height="0dp"
        tools:ignore="Suspicious0dp" />
        <ImageView
            android:padding="4dp"
            android:id="@+id/iv_avatar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/default_avatar_background"
            />
        <TextView
            android:visibility="invisible"
            android:id="@+id/tv_default_avatar"
            android:text="京怀"
            android:textColor="@color/white"
            android:textSize="11dp"
            android:gravity="center"
            android:layout_marginTop="-40dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>
</LinearLayout>