这篇文章主要介绍了android中H5本地缓存加载优化的方法，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
动手： 1.用 filedownloader 去下载了Html压缩文件
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implementation 'com.liulishuo.filedownloader:library:1.7.7'封装下载工具类：
public class FileDownloadUtils {
public static FileDownloadUtils instance = null;
public FileDownloadUtils() {
}
public static FileDownloadUtils getInstance() {
if (null == instance) {
instance = new FileDownloadUtils();
}
return instance;
}
/**
* 单任务下载
*
* @param downLoadUri 文件下载网络地址
* @param destinationUri 下载文件的存储绝对路径
*/
public void startDownLoadFileSingle(String downLoadUri, String destinationUri,FileDownLoaderCallBack callBack) {
FileDownloader.getImpl().create(downLoadUri).setPath(destinationUri).setListener(fileDownloadListener(callBack)).start();
}
// 下载方法
private FileDownloadListener fileDownloadListener(final FileDownLoaderCallBack callBack) {
return new FileDownloadListener() {
@Override
protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) {
//等待，已经进入下载队列
}
@Override
protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
//下载进度回调
if (callBack != null){
callBack.downLoadProgress(task,soFarBytes,totalBytes);
}
}
@Override
protected void completed(BaseDownloadTask task) {
//完成整个下载过程
if (callBack != null){
callBack.downLoadCompleted(task);
}
}
@Override
protected void paused(BaseDownloadTask task, int soFarBytes, int totalBytes) {
//暂停下载
}
@Override
protected void error(BaseDownloadTask task, Throwable e) {
//下载出现错误
if (callBack != null){
callBack.downLoadError(task,e);
}
}
@Override
protected void warn(BaseDownloadTask task) {
//在下载队列中(正在等待/正在下载)已经存在相同下载连接与相同存储路径的任务
}
};
}
public interface FileDownLoaderCallBack {
//文件是否下载完成
void downLoadCompleted(BaseDownloadTask task);
//文件是否下载失败
void downLoadError(BaseDownloadTask task, Throwable e);
//文件下载进度
void downLoadProgress(BaseDownloadTask task, int soFarBytes, int totalBytes);
}
}解压Zip文件
public class ZipUtils {
public static final String TAG = "ZIP";
public ZipUtils() {
}
/**
* 解压zip到指定的路径
*
* @param zipFileString ZIP的名称
* @param outPathString 要解压缩路径
* @throws Exception
*/
public static void UnZipFolder(String zipFileString, String outPathString) throws Exception {
ZipInputStream inZip = new ZipInputStream(new FileInputStream(zipFileString));
ZipEntry zipEntry;
String szName = "";
while ((zipEntry = inZip.getNextEntry()) != null) {
szName = zipEntry.getName();
if (zipEntry.isDirectory()) {
szName = szName.substring(0, szName.length() - 1);
File folder = new File(outPathString + File.separator + szName);
folder.mkdirs();
} else {
Log.e(TAG, outPathString + File.separator + szName);
File file = new File(outPathString + File.separator + szName);
if (!file.exists()) {
Log.e(TAG, "Create the file:" + outPathString + File.separator + szName);
file.getParentFile().mkdirs();
file.createNewFile();
}
// 获取文件的输出流
FileOutputStream out = new FileOutputStream(file);
int len;
byte[] buffer = new byte[1024];
// 读取（字节）字节到缓冲区
while ((len = inZip.read(buffer)) != -1) {
// 从缓冲区（0）位置写入（字节）字节
out.write(buffer, 0, len);
out.flush();
}
out.close();
}
}
inZip.close();
}
public static void UnZipFolder(String zipFileString, String outPathString, String szName) throws Exception {
ZipInputStream inZip = new ZipInputStream(new FileInputStream(zipFileString));
ZipEntry zipEntry;
while ((zipEntry = inZip.getNextEntry()) != null) {
//szName = zipEntry.getName();
if (zipEntry.isDirectory()) {
//获取部件的文件夹名
szName = szName.substring(0, szName.length() - 1);
File folder = new File(outPathString + File.separator + szName);
folder.mkdirs();
} else {
Log.e(TAG, outPathString + File.separator + szName);
File file = new File(outPathString + File.separator + szName);
if (!file.exists()) {
Log.e(TAG, "Create the file:" + outPathString + File.separator + szName);
file.getParentFile().mkdirs();
file.createNewFile();
}
// 获取文件的输出流
FileOutputStream out = new FileOutputStream(file);
int len;
byte[] buffer = new byte[1024];
// 读取（字节）字节到缓冲区
while ((len = inZip.read(buffer)) != -1) {
// 从缓冲区（0）位置写入（字节）字节
out.write(buffer, 0, len);
out.flush();
}
out.close();
}
}
inZip.close();
}
/**
* 压缩文件和文件夹
*
* @param srcFileString 要压缩的文件或文件夹
* @param zipFileString 解压完成的Zip路径
* @throws Exception
*/
public static void ZipFolder(String srcFileString, String zipFileString) throws Exception {
//创建ZIP
ZipOutputStream outZip = new ZipOutputStream(new FileOutputStream(zipFileString));
//创建文件
File file = new File(srcFileString);
//压缩
// LogUtils.LOGE("---->"+file.getParent()+"==="+file.getAbsolutePath());
ZipFiles(file.getParent()+ File.separator, file.getName(), outZip);
//完成和关闭
outZip.finish();
outZip.close();
}
/**
* 压缩文件
*
* @param folderString
* @param fileString
* @param zipOutputSteam
* @throws Exception
*/
private static void ZipFiles(String folderString, String fileString, ZipOutputStream zipOutputSteam) throws Exception {
// LogUtils.LOGE("folderString:" + folderString + "\n" +"fileString:" + fileString + "\n==========================");
if (zipOutputSteam == null)
return;
File file = new File(folderString + fileString);
if (file.isFile()) {
ZipEntry zipEntry = new ZipEntry(fileString);
FileInputStream inputStream = new FileInputStream(file);
zipOutputSteam.putNextEntry(zipEntry);
int len;
byte[] buffer = new byte[4096];
while ((len = inputStream.read(buffer)) != -1) {
zipOutputSteam.write(buffer, 0, len);
}
zipOutputSteam.closeEntry();
} else {
//文件夹
String fileList[] = file.list();
//没有子文件和压缩
if (fileList.length <= 0) {
ZipEntry zipEntry = new ZipEntry(fileString + File.separator);
zipOutputSteam.putNextEntry(zipEntry);
zipOutputSteam.closeEntry();
}
//子文件和递归
for (int i = 0; i < fileList.length; i++) {
ZipFiles(folderString+fileString+"/", fileList[i], zipOutputSteam);
}
}
}
/**
* 返回zip的文件输入流
*
* @param zipFileString zip的名称
* @param fileString ZIP的文件名
* @return InputStream
* @throws Exception
*/
public static InputStream UpZip(String zipFileString, String fileString) throws Exception {
ZipFile zipFile = new ZipFile(zipFileString);
ZipEntry zipEntry = zipFile.getEntry(fileString);
return zipFile.getInputStream(zipEntry);
}
/**
* 返回ZIP中的文件列表（文件和文件夹）
*
* @param zipFileString ZIP的名称
* @param bContainFolder 是否包含文件夹
* @param bContainFile 是否包含文件
* @return
* @throws Exception
*/
public static List<File> GetFileList(String zipFileString, boolean bContainFolder, boolean bContainFile) throws Exception {
List<File> fileList = new ArrayList<File>();
ZipInputStream inZip = new ZipInputStream(new FileInputStream(zipFileString));
ZipEntry zipEntry;
String szName = "";
while ((zipEntry = inZip.getNextEntry()) != null) {
szName = zipEntry.getName();
if (zipEntry.isDirectory()) {
// 获取部件的文件夹名
szName = szName.substring(0, szName.length() - 1);
File folder = new File(szName);
if (bContainFolder) {
fileList.add(folder);
}
} else {
File file = new File(szName);
if (bContainFile) {
fileList.add(file);
}
}
}
inZip.close();
return fileList;
}
}下载：
File file = new File(Constants.saveH5FilePath);
if (file.exists()) {
file.delete();
}
//开始下载ZIP压缩包
FileDownloadUtils.getInstance().startDownLoadFileSingle(bean.getUrl(), Constants.saveH5FilePath,
new FileDownloadUtils.FileDownLoaderCallBack() {
@Override
public void downLoadCompleted(BaseDownloadTask task) {
try {
//解压ZIP压缩包
ZipUtils.UnZipFolder(Constants.saveH5FilePath, Constants.unH5ZipPath);
PreferencesUtil.getInstance().saveParam("H5VersionName", H5VersionName);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void downLoadError(BaseDownloadTask task, Throwable e) {
}
@Override
public void downLoadProgress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
}
});webView 加载：
mWebSe.loadUrl("file:"+ Constants.unH5ZipPath+"/index.html");感谢你能够认真阅读完这篇文章，希望小编分享的“android中H5本地缓存加载优化的方法”这篇文章对大家有帮助，同时也希望大家多多支持亿速云，关注亿速云行业资讯频道，更多相关知识等着你来学习!
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