郭大神关于Glide文章的连接,很详细
Android图片加载框架最全解析(一),Glide的基本用法
Android图片加载框架最全解析(二),从源码的角度理解Glide的执行流程
Android图片加载框架最全解析(三),深入探究Glide的缓存机制
Android图片加载框架最全解析(四),玩转Glide的回调与监听
Android图片加载框架最全解析(五),Glide强大的图片变换功能
Android图片加载框架最全解析(六),探究Glide的自定义模块功能
Android图片加载框架最全解析(七),实现带进度的Glide图片加载功能
Android图片加载框架最全解析(八),带你全面了解Glide 4的用法
Glide官网地址
一般这个库就行
implementation 'com.android.support:appcompat-v7:27.1.1'
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
加载占位图和错误图
RequestOptions options = new RequestOptions()
.error(R.drawable.error) //加载失败显示的
.placeholder(R.drawable.loading);//加载中显示的
Glide.with(this)
.load(url) //图片地址
.apply(options) //RequestOptions
.into(imageView); //显示的控件
简单封装
public class GlideUtil {
public static void load(Context context,String url,ImageView imageView,RequestOptions options) {
Glide.with(context)
.load(url)
.apply(options)
.into(imageView);
}
}
API | 介绍 |
---|---|
占位符(Placeholder) | 当请求正在执行时被展示的 Drawable |
错误符(Error) | 请求永久性失败时展示 |
后备回调符(Fallback) | 在请求的url/model为 null 时展示 |
override | 指定了一个图片的尺寸,Target.SIZE_ORIGINAL 加载图片的原始尺寸 |
skipMemoryCache(true) | 禁用内存缓存功能 |
diskCacheStrategy(DiskCacheStrategy.NONE) | 禁用硬盘缓存功能,参数列表如下 diskCacheStrategy参数补充 |
asBitmap() | 只允许加载静态图片,。如果传入的是GIF图,会展示GIF图的第一帧 |
asFile() | 指定文件格式 |
asDrawable() | 指定Drawable格式 |
submit() | 使用如下四(3) |
transforms | 图片变换,Glide 默认有3个,如下四(4) |
diskCacheStrategy参数补充
参数 | 说明 |
---|---|
DiskCacheStrategy.NONE | 表示不缓存任何内容。 |
DiskCacheStrategy.DATA | 表示只缓存原始图片。 |
DiskCacheStrategy.RESOURCE | 表示只缓存转换过后的图片。 |
DiskCacheStrategy.ALL | 表示既缓存原始图片,也缓存转换过后的图片。 |
DiskCacheStrategy.AUTOMATIC | 表示让Glide根据图片资源智能地选择使用哪一种缓存策略(默认选项)。 |
通过如下代码,可以获取到,下载好的图片放在哪,可以看到 都在cache下
new Thread(new Runnable() {
@Override
public void run() {
try {
File file = Glide.with(MainActivity.this)
.asFile()
.load(url)
.submit()
.get();
Log.e("Tag", "path-->" + file.getPath());
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
}).start();
E/Tag: path-->/data/user/0/com.allens.glidedemo/cache/image_manager_disk_cache/309df01e6362ddc8939a4e3c549e8276dffb0446a89f2facee371909301fe76a.0
内置有这3个
RequestOptions options = new RequestOptions()
.centerCrop();
RequestOptions options = new RequestOptions()
.fitCenter();
RequestOptions options = new RequestOptions()
.circleCrop();//圆形
一般我们还会自己去定义,以下是常用的3种转换
使用起来也很简单
RequestOptions options = new RequestOptions()
.skipMemoryCache(true)
.diskCacheStrategy(DiskCacheStrategy.NONE);
//圆形
.transforms(new CircleTransform(mContext,2, Color.DKGRAY))//外圈宽度,外圈颜色
//黑白
.transforms(new BlackWhiteTransformation());
//高斯模糊 范围在 0 -- 25 越大模糊程度越高
.transforms(new BlurTransformation(mContext, 25)); // (0 < r <= 25)
//可以使用多种
.transforms(new BlurTransformation(mContext, 25),new CircleTransform(mContext,2, Color.DKGRAY))
package com.allens.lib_glide.Transformation;
import android.graphics.Bitmap;
import android.media.ThumbnailUtils;
import android.support.annotation.NonNull;
import android.view.animation.Transformation;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import java.security.MessageDigest;
/**
* 描述:
* 黑白
* Created by allens on 2018/1/8.
*/
public class BlackWhiteTransformation extends BitmapTransformation {
@Override
protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
return convertToBlackWhite(toTransform);
}
@Override
public void updateDiskCacheKey(MessageDigest messageDigest) {
}
private Bitmap convertToBlackWhite(Bitmap bmp) {
int width = bmp.getWidth(); // 获取位图的宽
int height = bmp.getHeight(); // 获取位图的高
int[] pixels = new int[width * height]; // 通过位图的大小创建像素点数组
bmp.getPixels(pixels, 0, width, 0, 0, width, height);
int alpha = 0xFF << 24;
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int grey = pixels[width * i + j];
//分离三原色
int red = ((grey & 0x00FF0000) >> 16);
int green = ((grey & 0x0000FF00) >> 8);
int blue = (grey & 0x000000FF);
//转化成灰度像素
grey = (int) (red * 0.3 + green * 0.59 + blue * 0.11);
grey = alpha | (grey << 16) | (grey << 8) | grey;
pixels[width * i + j] = grey;
}
}
//新建图片
Bitmap newBmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
//设置图片数据
newBmp.setPixels(pixels, 0, width, 0, 0, width, height);
Bitmap resizeBmp = ThumbnailUtils.extractThumbnail(newBmp, 380, 460);
return resizeBmp;
}
}
package com.allens.lib_glide.Transformation;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Build;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RSRuntimeException;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.support.annotation.NonNull;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import java.security.MessageDigest;
/**
* 描述: 高斯模糊
*
* Created by allens on 2018/1/8.
*/
public class BlurTransformation extends BitmapTransformation {
private Context context;
private float blurRadius;
public BlurTransformation(Context context, float blurRadius) {
this.context = context;
this.blurRadius = blurRadius;
}
@Override
protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
return blurBitmap(context, toTransform, blurRadius, outWidth, outHeight);
}
@Override
public void updateDiskCacheKey(MessageDigest messageDigest) {
}
/**
* @param context 上下文对象
* @param image 需要模糊的图片
* @param outWidth 输入出的宽度
* @param outHeight 输出的高度
* @return 模糊处理后的Bitmap
*/
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
public Bitmap blurBitmap(Context context, Bitmap image, float blurRadius, int outWidth, int outHeight) {
// 将缩小后的图片做为预渲染的图片
Bitmap inputBitmap = Bitmap.createScaledBitmap(image, outWidth, outHeight, false);
// 创建一张渲染后的输出图片
Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
// 创建RenderScript内核对象
RenderScript rs = RenderScript.create(context);
// 创建一个模糊效果的RenderScript的工具对象
ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
// 由于RenderScript并没有使用VM来分配内存,所以需要使用Allocation类来创建和分配内存空间
// 创建Allocation对象的时候其实内存是空的,需要使用copyTo()将数据填充进去
Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
// 设置渲染的模糊程度, 25f是最大模糊度
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
blurScript.setRadius(blurRadius);
}
// 设置blurScript对象的输入内存
blurScript.setInput(tmpIn);
// 将输出数据保存到输出内存中
blurScript.forEach(tmpOut);
// 将数据填充到Allocation中
tmpOut.copyTo(outputBitmap);
return outputBitmap;
}
}
package com.allens.lib_glide.Transformation;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.NonNull;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import java.security.MessageDigest;
/**
* 描述:
* 圆形
* Created by allens on 2018/1/8.
*/
public class CircleTransform extends BitmapTransformation {
private Paint mBorderPaint;
private float mBorderWidth;
public CircleTransform(Context context) {
super(context);
}
public CircleTransform(Context context, int borderWidth, int borderColor) {
super(context);
mBorderWidth = Resources.getSystem().getDisplayMetrics().density * borderWidth;
mBorderPaint = new Paint();
mBorderPaint.setDither(true);
mBorderPaint.setAntiAlias(true);
mBorderPaint.setColor(borderColor);
mBorderPaint.setStyle(Paint.Style.STROKE);
mBorderPaint.setStrokeWidth(mBorderWidth);
}
@Override
protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
return circleCrop(pool, toTransform);
}
@Override
public void updateDiskCacheKey(MessageDigest messageDigest) {
}
private Bitmap circleCrop(BitmapPool pool, Bitmap source) {
if (source == null) {
return null;
}
int size = (int) (Math.min(source.getWidth(), source.getHeight()) - (mBorderWidth / 2));
int x = (source.getWidth() - size) / 2;
int y = (source.getHeight() - size) / 2;
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);
if (mBorderPaint != null) {
float borderRadius = r - mBorderWidth / 2;
canvas.drawCircle(r, r, borderRadius, mBorderPaint);
}
return result;
}
}
package com.starot.spark.transformation;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.NonNull;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import java.security.MessageDigest;
/**
* 描述:
* 圆形
*
* @author allens
* @date 2018/1/8
*/
public class CircleTransform extends BitmapTransformation {
private Paint mBorderPaint;
private float mBorderWidth;
public CircleTransform(Context context) {
super(context);
}
public CircleTransform(Context context, int borderWidth, int borderColor) {
super(context);
mBorderWidth = Resources.getSystem().getDisplayMetrics().density * borderWidth;
mBorderPaint = new Paint();
mBorderPaint.setDither(true);
mBorderPaint.setAntiAlias(true);
mBorderPaint.setColor(borderColor);
mBorderPaint.setStyle(Paint.Style.STROKE);
mBorderPaint.setStrokeWidth(mBorderWidth);
}
@Override
protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
return circleCrop(pool, toTransform);
}
@Override
public void updateDiskCacheKey(MessageDigest messageDigest) {
}
private Bitmap circleCrop(BitmapPool pool, Bitmap source) {
if (source == null) {
return null;
}
int size = (int) (Math.min(source.getWidth(), source.getHeight()) - (mBorderWidth / 2));
int x = (source.getWidth() - size) / 2;
int y = (source.getHeight() - size) / 2;
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);
if (mBorderPaint != null) {
float borderRadius = r - mBorderWidth / 2;
canvas.drawCircle(r, r, borderRadius, mBorderPaint);
}
return result;
}
}
如果4.0用的不爽,就想使用3.0版本的那种链式写法,将Glide 关键字改成
GlideApp即可
GlideApp.with(this)
.load(url)
.placeholder(R.drawable.loading)
.error(R.drawable.error)
.skipMemoryCache(true)
.diskCacheStrategy(DiskCacheStrategy.NONE)
.override(Target.SIZE_ORIGINAL)
.circleCrop()
.into(imageView);
转载:https://www.jianshu.com/p/9db8f314b286