fresco进行代码,或者布进行实现

//代码,通过按钮实现

package com.example.fresco;import android.graphics.Bitmap;import android.graphics.Color;import android.graphics.PointF;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import com.facebook.drawee.backends.pipeline.Fresco;import com.facebook.drawee.backends.pipeline.PipelineDraweeController;import com.facebook.drawee.drawable.ScalingUtils;import com.facebook.drawee.generic.GenericDraweeHierarchy;import com.facebook.drawee.generic.GenericDraweeHierarchyBuilder;import com.facebook.drawee.generic.RoundingParams;import com.facebook.drawee.interfaces.DraweeController;import com.facebook.drawee.view.SimpleDraweeView;import com.facebook.imagepipeline.core.ImagePipelineConfig;import com.facebook.imagepipeline.decoder.ProgressiveJpegConfig;import com.facebook.imagepipeline.image.ImmutableQualityInfo;import com.facebook.imagepipeline.image.QualityInfo;import com.facebook.imagepipeline.request.BasePostprocessor;import com.facebook.imagepipeline.request.ImageRequest;import com.facebook.imagepipeline.request.ImageRequestBuilder;import com.facebook.imagepipeline.request.Postprocessor;public class UpdateActivity extends AppCompatActivity {    private SimpleDraweeView img;    private GenericDraweeHierarchyBuilder genericDraweeHierarchyBuilder;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_update);        //获取控件        Button bcbl = (Button) findViewById(R.id.bcbl);        Button zhong = (Button) findViewById(R.id.zhong);        Button yuan = (Button) findViewById(R.id.yuan);        Button yuanjiao = (Button) findViewById(R.id.yuanjiao);        Button bbc = (Button) findViewById(R.id.bbc);        Button xiugai = (Button) findViewById(R.id.xiugai);        Button er = (Button) findViewById(R.id.er);        Button jjs = (Button) findViewById(R.id.jjs);        Button liangbian = (Button) findViewById(R.id.liangbian);        Button leftcenter = (Button) findViewById(R.id.leftcenter);        img = (SimpleDraweeView) findViewById(R.id.img);        er.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                // 样式设置,保持宽高比例,对图片进行缩或放,图片位置,不居中，和显示边界右下对齐                GenericDraweeHierarchy FIT_END =genericDraweeHierarchyBuilder.setActualImageScaleType(ScalingUtils.ScaleType.FIT_END).build();                // 图片显示                imageDisplay(FIT_END);            }        });        //使两边都在显示边界内，居中显示。如果图尺寸大于显示边界，则保持长宽比缩小图片        liangbian.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                // 设置描述                //        tv_fresco_explain.setText("使两边都在显示边界内，居中显示。如果图尺寸大于显示边界，则保持长宽比缩小图片");                // 样式设置,使图片按比例显示在控件内,                GenericDraweeHierarchy CENTER_INSIDE =genericDraweeHierarchyBuilder.setActualImageScaleType(ScalingUtils.ScaleType.CENTER_INSIDE).build();                // 图片显示                imageDisplay(CENTER_INSIDE);            }        });        //左上为中点显示        leftcenter.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                // 设置描述//                tv_fresco_explain.setText("同centerCrop, 但居中点不是中点，而是指定的某个点,这里我设置为图片的左上角那点");                //指定中心点位置                PointF point = new PointF(0,0);                //根据指定的点设置为图片中心,使图片按比例缩小或放大,且裁剪成正方形.                GenericDraweeHierarchy FOCUS_CROP = genericDraweeHierarchyBuilder.setActualImageScaleType(ScalingUtils.ScaleType.FOCUS_CROP)                        .setActualImageFocusPoint(point).build();                // 图片显示                imageDisplay(FOCUS_CROP);            }        });        //修改图片        xiugai.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                // 图片地址                Uri uri = Uri.parse("http://120.27.23.105/images/ad/1.jpg");                // 修改图片                Postprocessor postProcessor = new BasePostprocessor() {                    //重新Postprocessor名称.                    @Override                    public String getName() {                        return "postProcessor";                    }                    //具体的进行绘制,bitmap就是下载过来的图片,绘制红色点状网络                    @Override                    public void process(Bitmap bitmap) {                        for (int x = 0; x < bitmap.getWidth(); x += 3) {                            for (int y = 0; y < bitmap.getHeight(); y += 3) {                    //给图片点设置颜色,参数X轴,Y轴,颜色                                bitmap.setPixel(x, y, Color.GRAY);                            }                        }                    }                };                    // 创建图片请求                ImageRequest request = ImageRequestBuilder.newBuilderWithSource(uri)                    //对加载进行处理.参数就是处理的模型Postprocessor对象.                        .setPostprocessor(postProcessor)                        .build();                    // 控制加载                PipelineDraweeController controller = (PipelineDraweeController) Fresco.newDraweeControllerBuilder()                        .setOldController(img.getController())                        .setImageRequest(request)                        .build();                    // 加载图片                img.setController(controller);            }        });        //渐进式展示图片        jjs.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                // 获取图片URL                Uri uri = Uri.parse("http://120.27.23.105/images/ad/1.jpg");// 加载质量配置,为了实现节省CPU,随着图片下载的进行，下载完的扫描序列如下: 1, 4, 5, 10/* 首次调用getNextScanNumberToDecode返回为2， 因为初始时，解码的扫描数为0。那么1将不会解码，下载完成4个扫描时，解码一次。下个解码为扫描数为6(5不会解码，10才会解码)*/                ProgressiveJpegConfig jpegConfig = new ProgressiveJpegConfig() {                    @Override                    public int getNextScanNumberToDecode(int scanNumber) {                        return scanNumber + 2;                    }                    @Override                    public QualityInfo getQualityInfo(int scanNumber) {                        boolean isGoodEnough = (scanNumber >= 5);                        return ImmutableQualityInfo.of(scanNumber, isGoodEnough, false);                    }                };//上面的和下面一行是固定代码.使用使复制粘贴即可                ImagePipelineConfig.newBuilder(UpdateActivity.this).setProgressiveJpegConfig(jpegConfig).build();// 创建 ImageRequest 对象.                ImageRequest request = ImageRequestBuilder.newBuilderWithSource(uri)//设置URL                        .setProgressiveRenderingEnabled(true)//打开渐进 渲染                        .build();                DraweeController draweeController = Fresco.newDraweeControllerBuilder()//必须要设置ImageRequest对象,里面包含了图片的网址.                        .setImageRequest(request)//开启用户点击重新加载图片的功能                        .setTapToRetryEnabled(true)//会复用以前的对象,可以节省内存.                        .setOldController(img.getController())                        .build();// 1设置加载的控制                img.setController(draweeController);            }        });        //初始化显示图片        img.setImageURI("http://pic1.sc.chinaz.com/Files/pic/pic9/201711/zzpic8416_s.jpg");        genericDraweeHierarchyBuilder = new GenericDraweeHierarchyBuilder(getResources());        //不包持比例        bbc.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                GenericDraweeHierarchy FIT_XY = genericDraweeHierarchyBuilder.setActualImageScaleType(ScalingUtils.ScaleType.FIT_XY).build();                // 图片显示                imageDisplay(FIT_XY);            }        });        //保持比例        bcbl.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                // 样式设置,保持宽高比例,对图片进行缩或放,图片位置居中显示(效果和上面一种类似)                GenericDraweeHierarchy FIT_CENTER =genericDraweeHierarchyBuilder.setActualImageScaleType(ScalingUtils.ScaleType.FIT_CENTER).build();                // 图片显示                imageDisplay(FIT_CENTER);            }        });        //圆形图片        yuan.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                RoundingParams roundingParams = RoundingParams.asCircle();                GenericDraweeHierarchy build = genericDraweeHierarchyBuilder.setRoundingParams(roundingParams)                        .build();                img.setHierarchy(build);                img.setImageURI("http://120.27.23.105/images/ad/1.jpg");            }        });        //圆角边        yuanjiao.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                RoundingParams roundingParams = RoundingParams.fromCornersRadius(60f);                GenericDraweeHierarchy build = genericDraweeHierarchyBuilder                        .setRoundingParams(roundingParams)                        .build();                img.setHierarchy(build);                img.setImageURI("http://120.27.23.105/images/ad/1.jpg");            }        });        //图片居中显示        zhong.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                GenericDraweeHierarchy build = genericDraweeHierarchyBuilder.setActualImageScaleType(ScalingUtils.ScaleType.CENTER)                        .build();                img.setHierarchy(build);                img.setImageURI("http://120.27.23.105/images/ad/1.jpg");            }        });    }    private void imageDisplay(GenericDraweeHierarchy hierarchy) {// 加载图片        Uri uri = Uri.parse("http://120.27.23.105/images/ad/1.jpg");        img.setHierarchy(hierarchy);        img.setImageURI(uri);    }}

//布局

<?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:orientation="vertical"    android:layout_height="match_parent"    tools:context="com.example.fresco.UpdateActivity">    <com.facebook.drawee.view.SimpleDraweeView        android:layout_width="200dp"        android:layout_marginTop="50dp"        android:layout_height="100dp"        android:background="@color/colorAccent"        android:layout_gravity="center_horizontal"        android:id="@+id/img"/>    <Button        android:layout_marginTop="20dp"        android:id="@+id/zhong"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="居中"/>    <Button        android:id="@+id/yuan"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="圆形"/>    <Button        android:id="@+id/yuanjiao"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="圆角"/>    <Button        android:id="@+id/bcbl"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="保持比例"/>    <Button        android:id="@+id/bbc"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="不保持比例"/>    <Button        android:id="@+id/jjs"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="渐进式展示图片"/>    <Button        android:id="@+id/xiugai"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="修改图片"/>    <Button        android:id="@+id/leftcenter"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="左上角为中点"/>    <Button        android:id="@+id/liangbian"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="两边都在显示边界内，居中显示"/>    <Button        android:id="@+id/er"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="不居中，和显示边界右下对齐"/></LinearLayout>

//单独的布局实现,不要代码

//布局实现务必要加  xmlns:fresco="http://schemas.android.com/apk/res-auto"

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:fresco="http://schemas.android.com/apk/res-auto"    android:orientation="vertical"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" tools:context="com.example.fresco.MainActivity">     <!-- fresco:fadeDuration="300" // 淡入淡出的持续时间     fresco:actualImageScaleType="focusCrop"  // 实际图像的缩放类型     fresco:placeholderImage="@color/wait_color"  //占位图     fresco:placeholderImageScaleType="fitCenter" //占位图的缩放类型     fresco:failureImage="@drawable/error" //下载失败显示的图片     fresco:failureImageScaleType="centerInside" //失败图的缩放类型     fresco:retryImage="@drawable/retrying"     //图片加载失败时显示，提示用户点击重新加载，重复加载4次还是没有加载出来的时候才会显示failureImage的图片     fresco:retryImageScaleType="centerCrop" //重新加载的图片缩放类型     fresco:progressBarImage="@drawable/progress_bar" //进度条图片     fresco:progressBarImageScaleType="centerInside"     fresco:progressBarAutoRotateInterval="1000"     //进度图自动旋转间隔时间(单位：毫秒ms)     fresco:backgroundImage="@color/blue"     //背景图片，这里的背景图片首先被绘制     fresco:overlayImage="@drawable/watermark"     // 设置叠加图，在xml中只能设置一张叠加图片，如果需要多张图片的话，需要在java代码中设置哦     fresco:pressedStateOverlayImage="@color/red"     // 设置点击状态下的叠加图     fresco:roundAsCircle="false" //设置为圆形图     fresco:roundedCornerRadius="1dp" // 圆角半径     fresco:roundTopLeft="true" // 左上角是否为圆角     fresco:roundTopRight="false"     fresco:roundBottomLeft="false"     fresco:roundBottomRight="true"     fresco:roundWithOverlayColor="@color/corner_color"     fresco:roundingBorderWidth="2dp" //边框的宽度     fresco:roundingBorderColor="@color/border_color" //边框颜色-->    <com.facebook.drawee.view.SimpleDraweeView        android:id="@+id/sd_vw"        android:layout_width="100dp"        android:layout_height="100dp"        />     <com.facebook.drawee.view.SimpleDraweeView         android:id="@+id/sdv_2"         android:layout_width="90dp"         android:layout_height="90dp"         android:layout_marginTop="15dp"         fresco:actualImageScaleType="centerCrop"         fresco:roundAsCircle="true"        /> <com.facebook.drawee.view.SimpleDraweeView     android:layout_width="200dp"     android:layout_height="200dp"     android:id="@+id/yi"/>    <com.facebook.drawee.view.SimpleDraweeView        android:layout_width="200dp"        android:layout_height="100dp"        android:id="@+id/id_main_sdv_sdv2"/>    <com.facebook.drawee.view.SimpleDraweeView        android:id="@+id/id_main_sdv_sdv"        android:layout_width="match_parent"        android:layout_height="200dp"        fresco:actualImageScaleType="focusCrop"        fresco:fadeDuration="3000"        fresco:failureImage="@mipmap/ic_launcher"        fresco:failureImageScaleType="centerInside"        fresco:placeholderImage="@mipmap/ic_launcher"        fresco:placeholderImageScaleType="fitCenter"        fresco:progressBarAutoRotateInterval="1000"        fresco:progressBarImageScaleType="centerInside"        fresco:retryImage="@mipmap/ic_launcher"        fresco:retryImageScaleType="centerCrop"        fresco:roundAsCircle="false"        fresco:viewAspectRatio="1.6" />    <Button        android:onClick="updateimg"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="更改图片"/></LinearLayout>

//配置类  进行初始化

public class App extends Application {    @Override    public void onCreate() {        super.onCreate();        Fresco.initialize(this);}