一.如何更换图片框架
框架设计过程中对于对于架构要求高内聚低耦合，图片加载框架中引
入三方框架提示开发效率，对于技术选型后的方案可能后面需求的变更原三方
sdk无法满足当前业务需求，故而需要更换原有sdk，为了将更改降到最低，所
有前面设计图片加载框架时要考虑当前这个风险点
使用设计模式来进一步解耦代码耦合度，来解决隔离风险点的目的，
即定义接口层业务依赖抽象即当前接口，具体实现有不同三方sdk完成。
因为业务依赖的是接口层对应后期代码维护更改量会控制在最小，对于原软件
稳定性影响也会极小达到更换图片加载框架的目的。
二.策略模式+构建者模式图片框架搭建
1.ImageOptions图片参数设置
/**
* @Author : yaotianxue
* @Time : On 2023/5/22 15:04
* @Description : ImageOptions图片设置
*/
class ImageOptions( var placeImage:Int,//占位符
var errorImage:Int,//错误图
var isStaticImage:Boolean,//是否为静态图片
var isGif:Boolean,//是否为动图
var imageSize:Array<Int>,//图片大小
var skipMemoryCache:Boolean,//关闭内存缓存
var skipDiskCache:Boolean//关闭磁盘缓存
){
constructor(builder: Builder):this(
builder.placeImage,
builder.errorImage,
builder.isStaticImage,
builder.isGif,
builder.imageSize,
builder.skipMemoryCache,
builder.skipDiskCache
)
class Builder{
var placeImage:Int = 0//占位符
var errorImage:Int = 0 //错误图
var isStaticImage:Boolean = true//是否为静态图片
var isGif:Boolean = false//是否为动图
var imageSize:Array<Int> = arrayOf(0,0)//图片大小
var skipMemoryCache:Boolean = false//关闭内存缓存
var skipDiskCache:Boolean = false//关闭磁盘缓存
fun setPlaceImage(placeImage:Int):Builder{
this.placeImage = placeImage
return this
}
fun setErrorImage(errorImage:Int):Builder{
this.errorImage = errorImage
return this
}
fun build():ImageOptions{
return ImageOptions(this)
}
}
}
2.IImageLoader接口以及实现子类
/**
* @Author : yaotianxue
* @Time : On 2023/5/22 15:03
* @Description : IImageLoader
*/
interface IImageLoader {
/**
* 加载本地图片到指定图片控件
*/
fun loadFileIntoImageView(context: Context,file: File,target: ImageView,config: ImageOptions)
/**
* 加载网络图片到指定图片控件
*/
fun loadUrlIntoImageView(context: Context,url: String,target: ImageView,config: ImageOptions)
/**
* 加载资源图片到指定图片控件
*/
fun loadResourceIntoImageView(context: Context,source: Int,target: ImageView,config: ImageOptions)
/**
* 加载Uri图片到指定图片控件
*/
fun loadUriIntoImageView(context: Context, uri: Uri, target: ImageView, config: ImageOptions)
/**
* 加载二进制数组到指定图片控件
*/
fun loadByteArrayIntoImageView(context: Context,bytes: Array<Byte>,target: ImageView,config: ImageOptions)
}
GlideImageLoader/FrscoImageLoader/PicassoImageLoader
/**
* @Author : yaotianxue
* @Time : On 2023/5/22 16:50
* @Description : GlideImageLoader
*/
class GlideImageLoader:IImageLoader {
override fun loadFileIntoImageView(
context: Context,
file: File,
target: ImageView,
config: ImageOptions,
) {
loadImageView(context,file,target,config)
}
override fun loadUrlIntoImageView(
context: Context,
url: String,
target: ImageView,
config: ImageOptions,
) {
loadImageView(context,url,target,config)
}
override fun loadResourceIntoImageView(
context: Context,
source: Int,
target: ImageView,
config: ImageOptions,
) {
loadImageView(context,source,target,config)
}
override fun loadUriIntoImageView(
context: Context,
uri: Uri,
target: ImageView,
config: ImageOptions,
) {
loadImageView(context,uri,target,config)
}
override fun loadByteArrayIntoImageView(
context: Context,
bytes: Array<Byte>,
target: ImageView,
config: ImageOptions,
) {
loadImageView(context,bytes,target,config)
}
/**
* 加载
*/
private fun loadImageView(
context: Context,
source: Any,
target: ImageView,
config: ImageOptions,
) {
//内存泄漏:该回收的资源无法被回收掉 context是activity，当页面销毁该回收activity，但是由于Glide引用当前activity、 导致activity无法回收
//解决方案1：使用弱应用
//解决方案2：activity传入上下文不要传this，传入application
var weakReference = WeakReference<Context>(context)//弱引用
if(weakReference.get() == null){
return
}
var builder = GlideApp.with(context).load(source)
setBuilderOptions(builder,config)
builder.into(target)
}
/**
* 设置图片参数
*/
private fun setBuilderOptions(builder: GlideRequest<Drawable>, config: ImageOptions) {
config.let {
var options = RequestOptions()
if(config.placeImage != 0){
options.placeholder(config.placeImage)
}
if(config.errorImage != 0){
options.error(config.errorImage)
}
config.imageSize.let {
if(config.imageSize.size != 2){
throw IllegalArgumentException("please set imageSize length size is 2")
}
options.override(config.imageSize[0],config.imageSize[1])
}
if(config.skipDiskCache) options.diskCacheStrategy(DiskCacheStrategy.NONE)
if(config.skipMemoryCache) options.skipMemoryCache(true)
builder.apply(options)
}
}
}
3.图片加载策略
/**
* @Author : yaotianxue
* @Time : On 2023/5/22 18:51
* @Description : ImageStrategy
*/
enum class ImageStrategy {
Glide,Picasso,Fresco
}
4.ImageLoaderManager
/**
* @Author : yaotianxue
* @Time : On 2023/5/23 15:56
* @Description : ImageLoaderManager
*/
class ImageLoaderManager(var imageStrategy: ImageStrategy) {
//策略模式创建不同的ImageLoader
private var imageLoader:IImageLoader = when(imageStrategy){
ImageStrategy.Glide -> GlideImageLoader()
ImageStrategy.Fresco -> FrescoImageLoader()
ImageStrategy.Picasso -> PicassoImageLoader()
}
/**
* 加载不同的资源类型
*/
fun loadIntoImageView(context: Context, source:Any, target: ImageView, config: ImageOptions){
//is 判断source数据类型 as 是强转
when(source){
is String -> imageLoader.loadUrlIntoImageView(context,source,target,config)
is File -> imageLoader.loadFileIntoImageView(context,source,target,config)
is Uri -> imageLoader.loadUriIntoImageView(context,source,target,config)
is Int -> imageLoader.loadResourceIntoImageView(context,source,target,config)
is Array<*> -> imageLoader.loadByteArrayIntoImageView(context,
source as Array<Byte>,target,config)
}
}
}
6.业务模块中使用:
/**
* @Author : yaotianxue
* @Time : On 2023/5/23 16:03
* @Description : ImageUtils
*/
class ImageUtils {
companion object{
val manager = ImageLoaderManager(ImageStrategy.Glide)
val options: ImageOptions = ImageOptions.Builder()
.setPlaceImage(R.mipmap.ic_launcher)
.setErrorImage(R.mipmap.ic_launcher)
.setSkipDiskCache(false)
.setSkipMemoryCache(true)
.build()
fun loadImageView(context: Context,source:Any,target:ImageView){
manager.loadIntoImageView(context,source,target,options)
}
}
}
ImageUtils.loadIageView(this,"",iv)
三.Glide配置
1.依赖：
config.gradle配置：
//Glide
// Glide集成OkHttp时需要使用的库，库已经将需要适配Okhhtp的大部分代码封装，注意如果之前已经使用了okhttp依赖注释掉
libIntegration = 'com.github.bumptech.glide:okhttp3-integration:4.13.0'
libGlide = 'com.github.bumptech.glide:glide:4.13.0'
libGlideCompiler = 'com.github.bumptech.glide:compiler:4.13.0'//Glide注解处理器的依赖
library-base封装网络
//glide图片框架
api libGlide
api libIntegration
kapt libGlideCompiler
项目结构：
2.缓存配置：
/**
* @Author : yaotianxue
* @Time : On 2023/5/22 17:03
* @Description : MyGlideModule 配置glide缓存
*/
@GlideModule
class CacheGlideModule:AppGlideModule() {
override fun applyOptions(context: Context, builder: GlideBuilder) {
//super.applyOptions(context, builder)
//设置内存缓存大小：根据机器自动计算
// var memorySizeCalculator = MemorySizeCalculator.Builder(context).build()
// builder.setMemoryCache(LruResourceCache(memorySizeCalculator.memoryCacheSize.toLong()))
//设置内存缓存大小:10M
builder.setMemoryCache(LruResourceCache(10*1024*1024))
//设置磁盘缓存大小：500M 默认250M 设置磁盘缓存文件夹名称 "my_image" 默认 "image_manager_disk_cache"
builder.setDiskCache(InternalCacheDiskCacheFactory(context,"my_image",500*1024*1024))//修改磁盘缓存的文件夹和磁盘大小
}
}
3.网络配置：glide默认使用httpUrlConnection完成网络请求，可以改成okhttp
/**
* @Author : yaotianxue
* @Time : On 2023/5/22 17:07
* @Description : OkhttpGlideModule：配置okhttp认证所有证书，可以认证自定义ca证书
*/
@GlideModule
class OkhttpGlideModule:LibraryGlideModule() {
override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
// super.registerComponents(context, glide, registry)
var client = OkHttpClient.Builder()
.sslSocketFactory(sSLSocketFactory,trustManager)
.build()
registry.replace(GlideUrl::class.java, InputStream::class.java, OkHttpUrlLoader.Factory(client))
}
/** 获取一个SSLSocketFactory */
val sSLSocketFactory: SSLSocketFactory
get() = try {
val sslContext = SSLContext.getInstance("SSL")
sslContext.init(null, arrayOf(trustManager), SecureRandom())
sslContext.socketFactory
} catch (e: Exception) {
throw RuntimeException(e)
}
/** 获取一个忽略证书的X509TrustManager */
val trustManager: X509TrustManager
get() = object : X509TrustManager {
override fun checkClientTrusted(chain: Array<X509Certificate>, authType: String) { }
override fun checkServerTrusted(chain: Array<X509Certificate>, authType: String) { }
override fun getAcceptedIssuers(): Array<X509Certificate> { return arrayOf() }
}
}
四.Bitmap三级缓存二次采样
传送门走你！！文章来源：https://www.toymoban.com/news/detail-456246.html
五.长图大图处理
https://www.jianshu.com/p/5ec13b295dd0文章来源地址https://www.toymoban.com/news/detail-456246.html
import android.app.appsearch.GetByDocumentIdRequest;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapRegionDecoder;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.InputDevice;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
/**
* @Author : yaotianxue
* @Time : On 2023/5/22 19:47
* @Description : LargeImageView
*/
public class LargeImageView extends View implements GestureDetector.OnGestureListener {
private BitmapRegionDecoder mDecoder;
//绘制的区域
private volatile Rect mRect = new Rect();
private int mScaledTouchSlop;
//分别记录上次的滑动的坐标
private int mLastX = 0;
private int mLastY = 0;
//图片的宽度和高度
private int mImageWidth,mImageHeight;
//手势控制器
private GestureDetector mGestureDetector;
//Bitmap工厂参数配置
private BitmapFactory.Options mOptions;
private String name;
public void setName(String name) {
this.name = name;
}
public LargeImageView(Context context) {
super(context);
init(context,null);
}
public LargeImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context,attrs);
}
public LargeImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context,attrs);
}
public LargeImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init(context,attrs);
}
private void init(Context context, AttributeSet attrs) {
//设置图片参数，如果对图片要求高采用ARGB_8888
mOptions = new BitmapFactory.Options();
mOptions.inPreferredConfig = Bitmap.Config.RGB_565;
mScaledTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
Log.d("ytx", "init: "+mScaledTouchSlop);
//初始化手势控制器
mGestureDetector = new GestureDetector(context,this);
InputStream inputStream = null;
try {
inputStream = context.getResources().getAssets().open("demo.jpg");
//初始化BitmapRegionDecoder，并用他显示图片
mDecoder = BitmapRegionDecoder.newInstance(inputStream,false);
//设置为true只采取图片的宽度和高度，不加载进内存
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(inputStream,null,options);
mImageHeight = options.outHeight;
mImageWidth = options.outWidth;
} catch (IOException e) {
e.printStackTrace();
}finally {
if(inputStream != null){
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//把触摸事件交给手势控制器处理
@Override
public boolean onTouchEvent(MotionEvent event) {
return mGestureDetector.onTouchEvent(event);
}
@Override
public boolean onDown(MotionEvent e) {
mLastX = (int) e.getRawX();
mLastY = (int) e.getRawY();
return true;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
int x = (int) e2.getRawX();
int y = (int) e2.getY();
move(x,y);
return true;
}
//移动的时候更新图片的显示的区域
private void move(int x, int y) {
int deltaX = x - mLastX;
int deltaY = y - mLastY;
if(mImageWidth > getWidth()){
mRect.offset(-deltaX,0);
if(mRect.right < mImageWidth){
mRect.right = mImageWidth;
mRect.left = mImageWidth - getWidth();
}
if(mRect.left < 0){
mRect.left = 0;
mRect.right = getRight();
}
invalidate();
}
if(mImageHeight > getHeight()){
mRect.offset(0,-deltaY);
if(mRect.bottom > mImageHeight){
mRect.bottom = mImageHeight;
mRect.top = mImageHeight - getHeight();
}
if(mRect.top < 0){
mRect.top = 0;
mRect.bottom = getHeight();
}
invalidate();
}
mLastX = x;
mLastY = y;
}
@Override
public void onLongPress(MotionEvent e) {
mLastX = (int) e.getRawX();
mLastY = (int) e.getRawY();
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
int x = (int)e2.getRawX();
int y = (int) e2.getRawY();
move(x,y);
return true;
}
@Override
protected void onDraw(Canvas canvas) {
Bitmap bitmap = mDecoder.decodeRegion(mRect,mOptions);
canvas.drawBitmap(bitmap,0,0,null);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth();
int height = getMeasuredHeight();
int imageWidth = mImageWidth;
int imageHeight = mImageHeight;
mRect.left = imageWidth/2 - width/2;
mRect.top = imageHeight/2 - height/2;
mRect.right = mRect.left +width;
mRect.bottom = mRect.top + height;
}
}
到了这里，关于图片模块封装：Glide高级使用+使用设计模式图片框架封装+Bitmap尺寸压缩和质量压缩+Bitmap加载大图长图的文章就介绍完了。如果您还想了解更多内容，请在右上角搜索TOY模板网以前的文章或继续浏览下面的相关文章，希望大家以后多多支持TOY模板网！
