picture.jpg
实现步骤
1.下载文件
文件的下载我使用了# FileDownloader这个库，FileDownloader功能十分强大，我这里只是简单地用了一下。
配置好下载地址和文件保存路径就行，啥都不用管。
BaseDownloadTask singleTask;
public int singleTaskId = 0;
//文件下载地址
private String downloadUrl = "https://b2c-store.oss-ap-southeast-1.aliyuncs.com/ceshi/FRT.zip";
//文件保存路径
private String saveZipFilePath = FileDownloadUtils.getDefaultSaveRootPath() + File.separator + "horizon"
+ File.separator + "MyFolder";
//下载下来的文件名称
private String fileName;
private void startDownload() {
singleTask = FileDownloader.getImpl().create(downloadUrl)
.setPath(saveZipFilePath, true)
.setCallbackProgressTimes(300)
.setMinIntervalUpdateSpeed(400)
.setListener(new FileDownloadSampleListener() {
@Override
protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) {
super.pending(task, soFarBytes, totalBytes);
}
@Override
protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
Log.e(TAG, "----->progress taskId:" + task.getId() + ",soFarBytes:" + soFarBytes + ",totalBytes:" + totalBytes
+ ",percent:" + soFarBytes * 1.0 / totalBytes + ",speed:" + task.getSpeed());
super.progress(task, soFarBytes, totalBytes);
}
@Override
protected void blockComplete(BaseDownloadTask task) {
Log.e(TAG,"----------->blockComplete taskId:" + task.getId() + ",filePath:" + task.getPath() +
",fileName:" + task.getFilename() + ",speed:" + task.getSpeed() + ",isReuse:" + task.reuse());
fileName = task.getFilename();
super.blockComplete(task);
}
@Override
protected void completed(BaseDownloadTask task) {
Log.e(TAG,"---------->completed taskId:" + task.getId() + ",isReuse:" + task.reuse());
super.completed(task);
}
@Override
protected void paused(BaseDownloadTask task, int soFarBytes, int totalBytes) {
super.paused(task, soFarBytes, totalBytes);
}
@Override
protected void error(BaseDownloadTask task, Throwable e) {
Log.e(TAG, "--------->error taskId:" + task.getId() + ",e:" + e.getLocalizedMessage());
super.error(task, e);
}
@Override
protected void warn(BaseDownloadTask task) {
super.warn(task);
}
});
singleTaskId = singleTask.start();
}
}
2.解压文件
我这里解压的是zip文件，懒得找第三方库了，直接使用Java提供的ZipFile。把文件解压出来用输入输出流保存就行。
/**
* zipFile 压缩文件
* folderPath 解压后的文件路径
* */
private void unZipFile(File zipFile, String folderPath) {
try {
ZipFile zfile = new ZipFile(zipFile);
Enumeration zList = zfile.entries();
ZipEntry ze = null;
byte[] buf = new byte[1024];
while (zList.hasMoreElements()) {
ze = (ZipEntry) zList.nextElement();
if (ze.isDirectory()) {
String dirstr = folderPath + File.separator + ze.getName();
dirstr = new String(dirstr.getBytes("8859_1"), "GB2312");
File f = new File(dirstr);
boolean mdir = f.mkdir();
continue;
}
OutputStream os = new BufferedOutputStream(new FileOutputStream(getRealFileName(folderPath,ze.getName())));
Log.e(TAG,"---->getRealFileName(folderPath,ze.getName()): " + getRealFileName(folderPath,ze.getName()).getPath() + " name:" + getRealFileName(folderPath,ze.getName()).getName());
InputStream is = new BufferedInputStream(zfile.getInputStream(ze));
int readLen = 0;
while ((readLen = is.read(buf, 0, 1024)) != -1) {
os.write(buf, 0, readLen);
}
is.close();
os.close();
}
zfile.close();
} catch (IOException e) {
e.printStackTrace();
}
//解压完成之后删除压缩包
deleteDir(zipFile);
}
用到了两个方法，一个是getRealFileName，用于生成实际的文件来保存解压后的文件。一个是deleteDir，用于删除压缩文件。
/**
* 根据保存zip的文件路径和zip文件相对路径名，返回一个实际的文件
* 因为zip文件解压后，里边可能是多重文件结构
* */
public File getRealFileName(String baseDir, String absFileName) {
String[] dirs = absFileName.split("/");
File ret = new File(baseDir);
String substr = null;
if (dirs.length > 1) {
for (int i = 0; i < dirs.length - 1; i++) {
substr = dirs[i];
try {
substr = new String(substr.getBytes("8859_1"), "GB2312");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
ret = new File(ret, substr);
}
if (!ret.exists()) {
ret.mkdirs();
}
substr = dirs[dirs.length - 1];
try {
substr = new String(substr.getBytes("8859_1"), "GB2312");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
ret = new File(ret, substr);
return ret;
}
return ret;
}
/**
* 删除整个文件夹 或者 文件
*/
public void deleteDir(File file) {
if (!file.exists()) {
return;
}
if (file.isDirectory()) {
File[] childFiles = file.listFiles();
if (childFiles == null || childFiles.length == 0) {
file.delete();
}
for (int index = 0; index < childFiles.length; index++) {
deleteDir(childFiles[index]);
}
}
file.delete();
}
3.最后是从解压后的文件中找出图片文件来进行展示
/**
* 存放当前文件夹下所有图片文件的路径的集合
* **/
private ArrayList<String> paths = new ArrayList<String>();
/**
* 从解压后的文件中获取图片进行展示
* */
private void getAndShowPicture() {
paths.clear();
Map<String,Bitmap> maps = new TreeMap<String, Bitmap>();
try {
maps = getImages(saveZipFilePath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
//将获取到的图片放在ImageView中用Viewpager展示
final List<ImageView> images = new ArrayList<>();
for (Map.Entry<String,Bitmap> entry : maps.entrySet()) {
if(null == entry.getValue()){
continue;
}
ImageView iv = new ImageView(this);
iv.setImageBitmap(entry.getValue());
images.add(iv);
}
vp_picture.setAdapter(new PagerAdapter() {
@Override
public int getCount() {
return images.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
//添加页卡
container.addView(images.get(position), 0);
return images.get(position);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(images.get(position));
}
});
}
/**
* 获取指定文件夹下面的所有图片的文件目录和其Bitmap对象
*/
private Map<String, Bitmap> getImages(String filePath) throws FileNotFoundException {
File baseFile = new File(filePath);
Map<String, Bitmap> maps = new TreeMap<String, Bitmap>();
if (baseFile != null && baseFile.exists()) {
getFiles(paths,baseFile);
if (!paths.isEmpty()) {
for (int i = 0; i < paths.size(); i++) {
Bitmap bitmap = BitmapFactory.decodeFile(paths.get(i));
maps.put(paths.get(i), bitmap);
}
}
}
return maps;
}
/**
* 获取图片路径
* */
private void getFiles(List list, File file){
File[] fs = file.listFiles();
for(File f:fs){
if(f.isDirectory()) {
getFiles(list,f);
}
if(f.isFile()) {
Log.e(TAG,"------------->getFiles f:" + f.getAbsolutePath() );
if(isImageFile(f.getAbsolutePath())){
list.add(f.getAbsolutePath());
}
}
}
}
/**
* 判断文件是否是图片
* */
private boolean isImageFile(String filePath){
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath,options);
if(options.outWidth == -1){
return false;
}
return true;
}
我在做这个功能的时候遇到一个问题。由于手机没有外部存储卡，压缩文件我保存在了应用专属文件目录下（即/storage/emulated/0/Android/data/PackageName/）。手机连接电脑之后，从电脑中打开手机的内部存储，有的手机可以找到这个目录然后把一个压缩文件放进去。我把压缩文件放进去之后在应用里执行解压代码将文件进行解压，结果发现3张图片只解压出来一张（Log显示所有的图片都解压并保存完毕），之后我反复做各种尝试，效果还是一样，直到我的手机不让我再往里边随意放东西。。。。。。
最后我用同样的代码，从服务器上下载下来一个只包含图片的压缩文件进行解压，结果解压和获取解压后的图片文件都顺顺利利的，我也不知道为啥子。
下边附上完整代码
package com.adminstrator.guaguakaapplication;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import com.liulishuo.filedownloader.BaseDownloadTask;
import com.liulishuo.filedownloader.FileDownloadSampleListener;
import com.liulishuo.filedownloader.FileDownloader;
import com.liulishuo.filedownloader.util.FileDownloadUtils;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
public class LoadAndUnzipFileActivity extends AppCompatActivity {
private String TAG = getClass().getSimpleName();
private Button btn_download, btn_unzip, btn_show_picture;
private ViewPager vp_picture;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_load_and_unzip_file);
initViews();
}
private void initViews() {
btn_download = findViewById(R.id.btn_download);
btn_unzip = findViewById(R.id.btn_unzip);
btn_show_picture = findViewById(R.id.btn_show_picture);
vp_picture = findViewById(R.id.vp_picture);
btn_download.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startDownload();
}
});
btn_unzip.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
unZipFile(new File(saveZipFilePath + File.separator + fileName),saveZipFilePath);
}
});
btn_show_picture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getAndShowPicture();
}
});
}
/**
* 存放当前文件夹下所有图片文件的路径的集合
* **/
private ArrayList<String> paths = new ArrayList<String>();
/**
* 从解压后的文件中获取图片进行展示
* */
private void getAndShowPicture() {
paths.clear();
Map<String,Bitmap> maps = new TreeMap<String, Bitmap>();
try {
maps = getImages(saveZipFilePath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
//将获取到的图片放在ImageView中用Viewpager展示
final List<ImageView> images = new ArrayList<>();
for (Map.Entry<String,Bitmap> entry : maps.entrySet()) {
if(null == entry.getValue()){
continue;
}
ImageView iv = new ImageView(this);
iv.setImageBitmap(entry.getValue());
images.add(iv);
}
vp_picture.setAdapter(new PagerAdapter() {
@Override
public int getCount() {
return images.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
//添加页卡
container.addView(images.get(position), 0);
return images.get(position);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(images.get(position));
}
});
}
/**
* 获取指定文件夹下面的所有图片的文件目录和其Bitmap对象
*/
private Map<String, Bitmap> getImages(String filePath) throws FileNotFoundException {
File baseFile = new File(filePath);
Map<String, Bitmap> maps = new TreeMap<String, Bitmap>();
if (baseFile != null && baseFile.exists()) {
getFiles(paths,baseFile);
if (!paths.isEmpty()) {
for (int i = 0; i < paths.size(); i++) {
Bitmap bitmap = BitmapFactory.decodeFile(paths.get(i));
maps.put(paths.get(i), bitmap);
}
}
}
return maps;
}
/**
* 获取图片路径
* */
private void getFiles(List list, File file){
File[] fs = file.listFiles();
for(File f:fs){
if(f.isDirectory()) {
getFiles(list,f);
}
if(f.isFile()) {
Log.e(TAG,"------------->getFiles f:" + f.getAbsolutePath() );
if(isImageFile(f.getAbsolutePath())){
list.add(f.getAbsolutePath());
}
}
}
}
/**
* 判断文件是否是图片
* */
private boolean isImageFile(String filePath){
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath,options);
if(options.outWidth == -1){
return false;
}
return true;
}
/**
* zipFile 压缩文件
* folderPath 解压后的文件路径
* */
private void unZipFile(File zipFile, String folderPath) {
try {
ZipFile zfile = new ZipFile(zipFile);
Enumeration zList = zfile.entries();
ZipEntry ze = null;
byte[] buf = new byte[1024];
while (zList.hasMoreElements()) {
ze = (ZipEntry) zList.nextElement();
if (ze.isDirectory()) {
String dirstr = folderPath + File.separator + ze.getName();
dirstr = new String(dirstr.getBytes("8859_1"), "GB2312");
File f = new File(dirstr);
boolean mdir = f.mkdir();
continue;
}
OutputStream os = new BufferedOutputStream(new FileOutputStream(getRealFileName(folderPath,ze.getName())));
Log.e(TAG,"---->getRealFileName(folderPath,ze.getName()): " + getRealFileName(folderPath,ze.getName()).getPath() + " name:" + getRealFileName(folderPath,ze.getName()).getName());
InputStream is = new BufferedInputStream(zfile.getInputStream(ze));
int readLen = 0;
while ((readLen = is.read(buf, 0, 1024)) != -1) {
os.write(buf, 0, readLen);
}
is.close();
os.close();
}
zfile.close();
} catch (IOException e) {
e.printStackTrace();
}
//解压完成之后删除压缩包
deleteDir(zipFile);
}
/**
* 根据保存zip的文件路径和zip文件相对路径名，返回一个实际的文件
* 因为zip文件解压后，里边可能是多重文件结构
* */
public File getRealFileName(String baseDir, String absFileName) {
String[] dirs = absFileName.split("/");
File ret = new File(baseDir);
String substr = null;
if (dirs.length > 1) {
for (int i = 0; i < dirs.length - 1; i++) {
substr = dirs[i];
try {
substr = new String(substr.getBytes("8859_1"), "GB2312");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
ret = new File(ret, substr);
}
if (!ret.exists()) {
ret.mkdirs();
}
substr = dirs[dirs.length - 1];
try {
substr = new String(substr.getBytes("8859_1"), "GB2312");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
ret = new File(ret, substr);
return ret;
}
return ret;
}
/**
* 删除整个文件夹 或者 文件
*/
public void deleteDir(File file) {
if (!file.exists()) {
return;
}
if (file.isDirectory()) {
File[] childFiles = file.listFiles();
if (childFiles == null || childFiles.length == 0) {
file.delete();
}
for (int index = 0; index < childFiles.length; index++) {
deleteDir(childFiles[index]);
}
}
file.delete();
}
BaseDownloadTask singleTask;
public int singleTaskId = 0;
//文件下载地址
private String downloadUrl = "https://b2c-store.oss-ap-southeast-1.aliyuncs.com/ceshi/FRT.zip";
//文件保存路径
private String saveZipFilePath = FileDownloadUtils.getDefaultSaveRootPath() + File.separator + "horizon"
+ File.separator + "MyFolder";
//下载下来的文件名称
private String fileName;
private void startDownload() {
singleTask = FileDownloader.getImpl().create(downloadUrl)
.setPath(saveZipFilePath, true)
.setCallbackProgressTimes(300)
.setMinIntervalUpdateSpeed(400)
.setListener(new FileDownloadSampleListener() {
@Override
protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) {
super.pending(task, soFarBytes, totalBytes);
}
@Override
protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) {
Log.e(TAG, "----->progress taskId:" + task.getId() + ",soFarBytes:" + soFarBytes + ",totalBytes:" + totalBytes
+ ",percent:" + soFarBytes * 1.0 / totalBytes + ",speed:" + task.getSpeed());
super.progress(task, soFarBytes, totalBytes);
}
@Override
protected void blockComplete(BaseDownloadTask task) {
Log.e(TAG,"----------->blockComplete taskId:" + task.getId() + ",filePath:" + task.getPath() +
",fileName:" + task.getFilename() + ",speed:" + task.getSpeed() + ",isReuse:" + task.reuse());
fileName = task.getFilename();
super.blockComplete(task);
}
@Override
protected void completed(BaseDownloadTask task) {
Log.e(TAG,"---------->completed taskId:" + task.getId() + ",isReuse:" + task.reuse());
super.completed(task);
}
@Override
protected void paused(BaseDownloadTask task, int soFarBytes, int totalBytes) {
super.paused(task, soFarBytes, totalBytes);
}
@Override
protected void error(BaseDownloadTask task, Throwable e) {
Log.e(TAG, "--------->error taskId:" + task.getId() + ",e:" + e.getLocalizedMessage());
super.error(task, e);
}
@Override
protected void warn(BaseDownloadTask task) {
super.warn(task);
}
});
singleTaskId = singleTask.start();
}
}
