之前已经记录过，批量下载图片和缓存本地的方式，此篇主要记录批量下载图片、视频，同时缓存在本地的功能实现
关联篇
- Android进阶之路 - 批量下载、缓存图片
- Android进阶之路 - 批量下载、缓存图片、视频
在此之前，我记录过一篇 主讲 - 批量下载、缓存图片，此篇可以作为上篇的进阶扩展，优化了调用场景和使用方式~
- 基础配置
- 图片下载
- 视频下载
- 完整封装
- 使用方式
关于实现批量下载、缓存功能，主要使用了以下几方面的知识
- 通过Glide下载图片
- 通过okhttputils下载视频
- greenDao数据库存储
加入以下权限
build.gradle（app）
//okHttpUtils网络框架
implementation 'com.squareup.okhttp3:okhttp:3.11.0'
implementation 'com.squareup.okio:okio:1.15.0'
implementation 'com.squareup.okhttp3:logging-interceptor:3.11.0'
//glide图片框架
implementation 'com.github.bumptech.glide:glide:4.3.1'
annotationProcessor('com.github.bumptech.glide:compiler:4.3.1')
implementation 'com.github.bumptech.glide:okhttp3-integration:4.3.1'
//greenDao数据库框架
implementation 'org.greenrobot:greendao:3.3.0'
implementation 'org.greenrobot:greendao-generator:3.3.0'
BannerInfo
在下方code中用到的bean，用于区分下载类型、地址、存储状态
package com.nk.machine.shop.model;
import java.io.Serializable;
public class BannerInfo implements Serializable {
private String picUrl;
private int type;
private int validLocalState = 0;
public int getValidLocalState() {
return validLocalState;
}
public void setValidLocalState(int validLocalState) {
this.validLocalState = validLocalState;
}
public String getPicUrl() {
return picUrl;
}
public void setPicUrl(String picUrl) {
this.picUrl = picUrl;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
}
图片下载
public void downAloneImg(int source, BannerInfo info) {
LogTool.e("提示：开始下载图片");
String picUrl = info.getPicUrl();
new Thread(() -> {
File file = GlideTool.downImageFile(NkApplication.getAppContext(), picUrl);
Bitmap bitmap = BitmapFactory.decodeFile(file.toString());
saveAloneImg(info, bitmap, Environment.getExternalStorageDirectory().getPath() + "/default");
}).start();
}
public void saveAloneImg(BannerInfo info, Bitmap bitmap, String path) {
File file = new File(path);
if (!file.exists()) {
file.mkdir();
}
try {
String tmpImgPath = path + "/" + System.currentTimeMillis() + ".png";
FileOutputStream fileOutputStream = new FileOutputStream(tmpImgPath);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
fileOutputStream.close();
int type = info.getType();
String picUrl = info.getPicUrl();
int interval = info.getInterval();
LogTool.e("图片保存成功,tmpImgPath=" + tmpImgPath);
DaoStrategy.getInstance(new LyPicture(1, interval, type, picUrl, tmpImgPath)).insert();
} catch (Exception e) {
LogTool.e(e.getMessage());
}
}
视频下载
public void downAloneVideo(int source, BannerInfo info) {
String picUrl = info.getPicUrl();
LogTool.e("提示：开始下载视频"+picUrl));
//定义存储路径
String path = "";
//如果不需要分渠道做优化，则可固定一个路径
path = Environment.getExternalStorageDirectory().getPath() + "/default";
//定义存储文件名
String tmpFileName = System.currentTimeMillis() + ".mp4";
//开始下载
OkHttpUtils.get()
.url(picUrl)
.build()
.execute(new FileCallBack(path, tmpFileName) {
@Override
public void onError(Call call, Exception e, int id) {
LogTool.e("视频下载错误：" + e.getMessage());
downAloneVideo(source, info);
}
@Override
public void onResponse(File response, int id) {
LogTool.e("视频下载成功"+response.getAbsolutePath());
//将数据保存到数据库中
DaoStrategy.getInstance(new LyPicture(1, interval, info.getType(), picUrl, response.getAbsolutePath())).insert();
}
});
完整封装
public class DownLoadUtil{
public static synchronized void downVideoImg(List bannerList) {
//检测本地数据库数据
List localList = (List) DaoStrategy.getInstance(new LyPicture()).queryConditionList(1);
for (int i = 0; i < bannerList.size(); i++) {
BannerInfo info = bannerList.get(i);
//检测本地数据库资源，查询是否存在已下载的资源，减少重复下载，提升效率（如不需要可删除）
if (localList.size() >= 1) {
for (int j = 0; j < localList.size(); j++) {
if (info.getPicUrl().equals(info.getPicUrl())) {
LogTool.e("提示：本地已有该资源");
return;
}
}
}
//必有：主要判断是下载图片还是视频
if (info.getType() == 2) {
downAloneVideo(1, bannerList.get(i));
} else {
downAloneImg(1, bannerList.get(i));
}
}
}
public void downAloneImg(int source, BannerInfo info) {
LogTool.e("提示：开始下载图片");
String picUrl = info.getPicUrl();
new Thread(() -> {
File file = GlideTool.downImageFile(NkApplication.getAppContext(), picUrl);
Bitmap bitmap = BitmapFactory.decodeFile(file.toString());
if (source == 1) {
saveAloneImg(info, bitmap, Constant.LocalPath.BANNER_PATH);
} else if (source == 2) {
saveAloneImg(info, bitmap, Constant.LocalPath.CERTIFICATE_PATH);
} else {
saveAloneImg(info, bitmap, Constant.LocalPath.DEFAULT_PATH);
}
}).start();
}
public void saveAloneImg(BannerInfo info, Bitmap bitmap, String path) {
File file = new File(path);
if (!file.exists()) {
file.mkdir();
}
try {
String tmpImgPath = path + "/" + System.currentTimeMillis() + ".png";
FileOutputStream fileOutputStream = new FileOutputStream(tmpImgPath);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
fileOutputStream.close();
int type = info.getType();
String picUrl = info.getPicUrl();
int interval = info.getInterval();
LogTool.e("图片保存成功,tmpImgPath=" + tmpImgPath);
DaoStrategy.getInstance(new LyPicture(1, interval, type, picUrl, tmpImgPath)).insert();
} catch (Exception e) {
LogTool.e(e.getMessage());
}
}
public void downAloneVideo(int source, BannerInfo info) {
LogTool.e("提示：开始下载视频"+info.getPicUrl());
String picUrl = info.getPicUrl();
int interval = info.getInterval();
String path = "";
if (source == 1) {
path = Constant.LocalPath.BANNER_PATH;
} else if (source == 2) {
path = Constant.LocalPath.CERTIFICATE_PATH;
} else {
path = Constant.LocalPath.DEFAULT_PATH;
}
String tmpFileName = System.currentTimeMillis() + ".mp4";
OkHttpUtils.get()
.url(picUrl)
.build()
.execute(new FileCallBack(path, tmpFileName) {
@Override
public void onError(Call call, Exception e, int id) {
LogTool.e("视频下载错误：" + e.getMessage());
downAloneVideo(source, info);
}
@Override
public void onResponse(File response, int id) {
LogTool.e("视频下载成功"+response.getAbsolutePath());
DaoStrategy.getInstance(new LyPicture(1, interval, info.getType(), picUrl, response.getAbsolutePath())).insert();
}
});
}
使用方式
使用简单，无需关注内部实现，同时实现了单一原则，统一了下载出口
在需要下载视频、图片的地方直接调用以下代码即可
//bannerList为需要下载的图片和视频 DownLoadUtil.downVideoImg(bannerList);
