Glide4.0 centerCrop属性和圆角 冲突

首先致谢：https://blog.csdn.net/flyinbed_/article/details/75506062

咱们不是代码的生产者，只是代码的搬运工。

最近有个工作中有个需求就是展示的图片必须圆角、正方形，当时一想这太尼玛简单了，无非就是设置一个图片参数的大小，然后在设置一个centerCrop的属性，在自定义一个类去继承BitmapTransformation重画一下。

结果写的时候发现，在glide4.0上面 centerCrop和圆角图片有冲突只能显示一个，结果就度娘问了一边，大部分都是下面这行代码，发现这个在glide4.0上面直接报错  无法使用，最后没办法了只能自己撸一遍源码看看了。

transform(new CenterCrop(getActivity()),new GlideRoundImage(getActivity()))

　　

点开centerCrop的源码

/**
 * Applies {@link CenterCrop} to all default types and
 * throws an exception if asked to transform an unknown type.
 *
 * <p>this will override previous calls to {@link #dontTransform()} ()}.
 *
 * @see #transform(Class, Transformation)
 * @see #optionalCenterCrop()
 */
public RequestOptions centerCrop() {
  return transform(DownsampleStrategy.CENTER_OUTSIDE, new CenterCrop());
}

　　

原来这犊子也是调用的 transform的方法，在点开 new Centercrop()这个方法看看里面的实现

/**
 * Scale the image so that either the width of the image matches the given width and the height of
 * the image is greater than the given height or vice versa, and then crop the larger dimension to
 * match the given dimension.
 *
 * Does not maintain the image's aspect ratio
 */
public class CenterCrop extends BitmapTransformation {
  private static final String ID = "com.bumptech.glide.load.resource.bitmap.CenterCrop";
  private static final byte[] ID_BYTES = ID.getBytes(CHARSET);  

  public CenterCrop() {
    // Intentionally empty.
  }  

  @Deprecated
  public CenterCrop(@SuppressWarnings("unused") Context context) {
    this();
  }  

  @Deprecated
  public CenterCrop(@SuppressWarnings("unused") BitmapPool bitmapPool) {
    this();
  }  

  // Bitmap doesn't implement equals, so == and .equals are equivalent here.
  @SuppressWarnings("PMD.CompareObjectsWithEquals")
  @Override
  protected Bitmap transform(
      @NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
    return TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight);
  }  

  @Override
  public boolean equals(Object o) {
    return o instanceof CenterCrop;
  }  

  @Override
  public int hashCode() {
    return ID.hashCode();
  }  

  @Override
  public void updateDiskCacheKey(MessageDigest messageDigest) {
    messageDigest.update(ID_BYTES);
  }
}

　　

不出所料 这里面也是继承了BitmapTransformation这个类然后重画了一边，后面我们自己有调用了transform()这个方法等于把系统的Centercrop这个方法给覆盖了，所以说这两个属性谁在后面就用哪种效果，但是现在的问题是我想两个都要用咋整，那么问题来了，这下只能在自己自定义的BitmapTransformation将两个效果一起画出来了；

先是我的布局文件：很简单就一个线性布局+3个ImageView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.flyinbed.myapplication.MainActivity">  

    <ImageView
        android:id="@+id/icon1"
        android:layout_width="150dp"
        android:layout_height="150dp" />  

    <ImageView
        android:id="@+id/icon2"
        android:layout_marginTop="10dp"
        android:layout_width="150dp"
        android:layout_height="150dp"  />  

    <ImageView
        android:id="@+id/icon3"
        android:layout_marginTop="10dp"
        android:layout_width="150dp"
        android:layout_height="150dp"  />  

</LinearLayout>

　　

Activity代码：3个Imageview加载3张本地图片

public class MainActivity extends AppCompatActivity {
    private ImageView icon1,icon2,icon3;  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        icon1 = (ImageView) findViewById(R.id.icon1);
        icon2 = (ImageView) findViewById(R.id.icon2);
        icon3 = (ImageView) findViewById(R.id.icon3);  

        Glide.with(this).load(R.drawable.item1).into(icon1);
        Glide.with(this).load(R.drawable.image2).into(icon2);
        Glide.with(this).load(R.drawable.image3).into(icon3);
    }
}

　　

效果：

先设置一下Centercrop的属性：

题外话：glide4.0想设置图片的属性现在都是通过RequestOptions()这个类来实现的，然后在glide加载的时候通过

.apply()把那个类给塞进去就好了；

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        icon1 = (ImageView) findViewById(R.id.icon1);
        icon2 = (ImageView) findViewById(R.id.icon2);
        icon3 = (ImageView) findViewById(R.id.icon3);  

        RequestOptions myOptions = new RequestOptions()
                .centerCrop();  

        Glide.with(this)
                .load(R.drawable.item1)
                .apply(myOptions)
                .into(icon1);
        Glide.with(this)
                .load(R.drawable.image2)
                .apply(myOptions)
                .into(icon2);
        Glide.with(this)
                .load(R.drawable.image3)
                .apply(myOptions)
                .into(icon3);
    }

　　

现在设置transform圆角属性

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        icon1 = (ImageView) findViewById(R.id.icon1);
        icon2 = (ImageView) findViewById(R.id.icon2);
        icon3 = (ImageView) findViewById(R.id.icon3);  

        RequestOptions myOptions = new RequestOptions()
                .centerCrop()
                .transform(new GlideRoundTransform(this,30));  

        Glide.with(this)
                .load(R.drawable.item1)
                .apply(myOptions)
                .into(icon1);
        Glide.with(this)
                .load(R.drawable.image2)
                .apply(myOptions)
                .into(icon2);
        Glide.with(this)
                .load(R.drawable.image3)
                .apply(myOptions)
                .into(icon3);
    }

　　

很明显把Centercrop的属性给覆盖了；

下面是我自定义类GlideRoundTransform()的代码：

public class GlideRoundTransform extends BitmapTransformation {  

    private static float radius = 0f;  

    public GlideRoundTransform(Context context) {
        this(context, 4);
    }  

    public GlideRoundTransform(Context context, int dp) {
        super(context);
        this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }  

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return roundCrop(pool, toTransform);
    }  

    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) {  

    }  

}

　　

接下来就开始解决这个问题了，在这个自定义类当中，我们要先获取到Centercrop()这个属性后得到到图片，然后在根据这个图片在进行圆角加工然后在返回。

其实屡清楚了思路很简单 也就是一样代码的事，下面是我更改以后的代码：

public class GlideRoundTransform extends BitmapTransformation {  

    private static float radius = 0f;  

    public GlideRoundTransform(Context context) {
        this(context, 4);
    }  

    public GlideRoundTransform(Context context, int dp) {
        super(context);
        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) {  

    }  

}

　　

在看看效果：

很完美，搞定收工，接下来是Activity的完整代码：

public class MainActivity extends AppCompatActivity {
    private ImageView icon1,icon2,icon3;  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        icon1 = (ImageView) findViewById(R.id.icon1);
        icon2 = (ImageView) findViewById(R.id.icon2);
        icon3 = (ImageView) findViewById(R.id.icon3);  

        //第一个是上下文，第二个是圆角的弧度
        RequestOptions myOptions = new RequestOptions()
                .transform(new GlideRoundTransform(this,30));  

        Glide.with(this)
                .load(R.drawable.item1)
                .apply(myOptions)
                .into(icon1);
        Glide.with(this)
                .load(R.drawable.image2)
                .apply(myOptions)
                .into(icon2);
        Glide.with(this)
                .load(R.drawable.image3)
                .apply(myOptions)
                .into(icon3);
    }
}

　　

要是设置的效果没用就清除下缓存，要是还不行就卸载重装好了！！！！！

总结: 核心代码

 public class GlideRoundTransform extends BitmapTransformation {  

     private static float radius = 0f;  

     public GlideRoundTransform(Context context) {
         this(context, 4);
     }  

     public GlideRoundTransform(Context context, int dp) {
         super(context);
         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) {  

     }  

 }  

圆角转换 GlideRoundTransform 核心代码

         //第一个是上下文，第二个是圆角的弧度
         RequestOptions myOptions = new RequestOptions()
                 .transform(new GlideRoundTransform(this,30));  

         Glide.with(this)
                 .load(path)
                 .apply(myOptions)
                 .into(img);  

使用方法 核心代码