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需求Glide下载图片并切圆角或圆形,但图片有大有小,图片不能改变,切圆还好说,但是切圆角就会发现图片小的会比图片大的要圆
搜一下 " Glide动态加载圆形图片跟圆角图片 " 就会出现很多文章,但这些都不能解决上面的问题 怎样能 Glide动态加载不同大小的图片切圆形图片跟圆角图片呢?
解决很简单:既然是图片大小不一致而导致图片切出来不一样,那就把图片变的一样大小不就可以吗
申明一下我的代码也是在Glide动态加载圆形图片跟圆角图片搜出来的代码基础上修改的. 下面就是代码了.

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"

    defaultConfig {
        applicationId "cn.xm.weidongjian.glidedemo"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:26.1.0'
    compile 'com.github.bumptech.glide:glide:3.6.1'
}

activity_main.xml

<RelativeLayout 
                xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:paddingLeft="@dimen/activity_horizontal_margin"
                android:paddingRight="@dimen/activity_horizontal_margin"
                android:paddingTop="@dimen/activity_vertical_margin"
                android:paddingBottom="@dimen/activity_vertical_margin"
                tools:context=".MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="正常图片"
        android:id="@+id/button"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"/>

    <ImageView
        android:layout_width="72dp"
        android:layout_height="72dp"
        android:id="@+id/imageView"
        android:scaleType="fitCenter"
        android:layout_below="@+id/button"
        android:layout_alignRight="@+id/button"
        android:layout_alignEnd="@+id/button"
        android:layout_marginTop="150dp"/>

    <ImageView
        android:layout_width="72dp"
        android:layout_height="72dp"
        android:id="@+id/imageView2"
        android:scaleType="fitCenter"
        android:layout_below="@+id/imageView"
        android:layout_alignRight="@+id/imageView"
        android:layout_alignEnd="@+id/imageView"
        android:layout_marginTop="5dp"
        />


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="圆角图片"
        android:id="@+id/button2"
        android:layout_below="@+id/button"
        android:layout_alignLeft="@+id/button"
        android:layout_alignRight="@+id/imageView"
        android:layout_alignEnd="@+id/imageView"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="大圆角图片"
        android:id="@+id/button3"
        android:layout_below="@+id/button2"
        android:layout_alignLeft="@+id/button2"
        android:layout_alignStart="@+id/button2"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="圆形图片"
        android:id="@+id/button4"
        android:layout_below="@+id/button3"
        android:layout_alignLeft="@+id/button"
        android:layout_alignRight="@+id/button3"
        android:layout_alignEnd="@+id/button3"/>
</RelativeLayout>

MainActivity

package cn.xm.weidongjian.glidedemo;

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.RequestManager;

public class MainActivity extends AppCompatActivity implements OnClickListener {

    private ImageView imageView;
    private RequestManager glideRequest;
    private Context context = this;
    private ImageView imageView2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

    private void init() {
        findViewById(R.id.button).setOnClickListener(this);
        findViewById(R.id.button2).setOnClickListener(this);
        findViewById(R.id.button3).setOnClickListener(this);
        findViewById(R.id.button4).setOnClickListener(this);
        imageView = (ImageView) findViewById(R.id.imageView);
        imageView2 = (ImageView) findViewById(R.id.imageView2);
        glideRequest = Glide.with(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button:
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1704146358.png").into(imageView);
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1716089900.png").into(imageView2);
                break;
            case R.id.button2:
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1704146358.png").transform(new GlideRoundTransform(context)).into(imageView);
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1716089900.png").transform(new GlideRoundTransform(context)).into(imageView2);
                break;
            case R.id.button3:
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1704146358.png").transform(new GlideRoundTransform(context, 7)).into(imageView);
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1716089900.png").transform(new GlideRoundTransform(context, 7)).into(imageView2);
                break;
            case R.id.button4:
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1704146358.png").transform(new GlideCircleTransform(context)).into(imageView);
                glideRequest.load("http://androidop.le890.com/hma/upload/2016/10/11/1716089900.png").transform(new GlideCircleTransform(context)).into(imageView2);
                break;
        }
    }
}

GlideCircleTransform

package cn.xm.weidongjian.glidedemo;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;

public class GlideCircleTransform extends BitmapTransformation {
    public GlideCircleTransform(Context context) {
        super(context);
    }

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

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;

        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;
        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);

        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override public String getId() {
        return getClass().getName();
    }
}

GlideRoundTransform

package cn.xm.weidongjian.glidedemo;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.Log;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;

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 bitmap = changeBitmapSize(source);
        Bitmap result = pool.get(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_4444);
        if (result == null) {

            int width = bitmap.getWidth();
            int height = bitmap.getHeight();
            result = Bitmap.createBitmap(width,height, Bitmap.Config.ARGB_4444);
        }
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(bitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0f, 0f, bitmap.getWidth(), bitmap.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);
        return result;
    }
    public static Bitmap changeBitmapSize(Bitmap bitmap) {
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        //设置想要的大小
        int newWidth=72;
        int newHeight=72;
        //计算压缩的比率
        float scaleWidth=((float)newWidth)/width;
        float scaleHeight=((float)newHeight)/height;
        //获取想要缩放的matrix
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth,scaleHeight);
        //获取新的bitmap
        bitmap=Bitmap.createBitmap(bitmap,0,0,width,height,matrix,true);
        bitmap.getWidth();
        bitmap.getHeight();
        Log.e("newWidth","newWidth"+bitmap.getWidth());
        Log.e("newHeight","newHeight"+bitmap.getHeight());
        return bitmap;
    }

    @Override public String getId() {
        return getClass().getName() + Math.round(radius);
    }
}

很简单吧,就是用changeBitmapSize方法把图片压缩到72*72的这样图片都一样大了,在切就不会出现切出来的图片效果不一样了

最后代码(dome)地址: https://github.com/liang9/Imagedome