我正在尝试使用Java创建下载ZIP文件的应用程序，然后将其解压缩到Android设备上的“下载”文件夹中。问题是，当程序下载它时，ZIP文件下载已损坏且内部没有任何内容，当然，解压缩文件夹为空。我有三个主要类，分别是“下载文件”，“UnZip”，当然还有“MainActivity”。 他们在这里：
MainActivity：
package com.NautGames.xecta.app;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
//Chat bot library
import org.alicebot.ab.Chat;
import org.alicebot.ab.Bot;
import android.widget.EditText;
import java.io.File;
import android.view.View;
import android.widget.Button;
import android.os.Environment;
import android.widget.TextView;
import android.widget.Toast;
import android.app.ProgressDialog;
public class MainActivity extends ActionBarActivity {
Button clickDownload;
TextView input;
String dPath = Environment.getExternalStorageDirectory().getPath() ;
private ProgressDialog mProgressDialog;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
clickDownload = (Button)findViewById(R.id.btn_download);
}
//EditText mEdit = (EditText)findViewById(R.id.editText1);
public void buttonOnClick(View v)
{
input = (TextView) findViewById(R.id.editText1);
String dbPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Download/Ab";
Button button=(Button) v;
//Creating bot
String botname="xecta";
String path= dbPath;
Bot xecta = new Bot(botname, path);
Chat chatSession = new Chat(xecta);
String request = input.getText().toString();
String response = chatSession.multisentenceRespond(request);
((Button) v).setText(response);
}
/**
* Button that starts download an Unzip.
*/
public void onClickDownload(View v)
{
Button clickDownload = (Button) v;
String dPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Download";
((Button) v).setText("Downloading");
//To download zip
//URL
String url = "http://download1642.mediafire.com/hn64kc18pafg/ojajp9o26scdbwd/Files.zip";
//Path to save to
String savePath = dPath + "/Files";
//Name to save as
String saveName = "Xecta.zip";
DownloadFile download = new DownloadFile();
download.downloadFile(url, savePath, saveName);
//To unzip files
String zipFile = dPath + "/Files/files";
String unzipLocation = dPath + "/Files";
UnZip d = new UnZip(zipFile, unzipLocation);
d.unzip();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
DownloadFile：
package com.NautGames.xecta.app;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.Button;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
public class DownloadFile extends ActionBarActivity{
Button download;
String FILE_DOWNLOAD_CONNECT = "Connecting...";
String FILE_DOWNLOAD_UPDATE = "Downloading";
String FILE_DOWNLOAD_COMPLETE = "Complete!";
String FILE_DOWNLOAD_ERROR = "Error Downloading";
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
download = (Button)findViewById(R.id.btn_download);
}
public void downloadFile(final String url, final String savePath, final String saveName) {
new Thread(new Runnable() {
public void run() {
try {
//download.setText(FILE_DOWNLOAD_CONNECT);
URL sourceUrl = new URL(url);
URLConnection conn = sourceUrl.openConnection();
conn.connect();
InputStream inputStream = conn.getInputStream();
int fileSize = conn.getContentLength();
File savefilepath = new File(savePath);
if (!savefilepath.exists()) {
savefilepath.mkdirs();
}
File savefile = new File(savePath+saveName);
if (savefile.exists()) {
savefile.delete();
}
savefile.createNewFile();
FileOutputStream outputStream = new FileOutputStream(
savePath+saveName, true);
byte[] buffer = new byte[1024];
int readCount = 0;
int readNum = 0;
int prevPercent = 0;
while (readCount < fileSize && readNum != -1) {
readNum = inputStream.read(buffer, 0, readNum);
if (readNum > -1) {
outputStream.write(buffer);
readCount = readCount + readNum;
int percent = (int) (readCount * 100 / fileSize);
if (percent > prevPercent) {
System.out.print(percent);
prevPercent = percent;
}
}
}
outputStream.flush();
outputStream.close();
inputStream.close();
//Thread.sleep(50);
//download.setText(FILE_DOWNLOAD_COMPLETE);
} catch (Exception e) {
//download.setText(FILE_DOWNLOAD_ERROR);
}
}
}).start();
}
}
解压缩：
package com.NautGames.xecta.app;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class UnZip {
private String _zipFile;
private String _location;
public UnZip(String zipFile, String location) {
_zipFile = zipFile;
_location = location;
_dirChecker("");
}
public void unzip() {
try {
FileInputStream fin = new FileInputStream(_zipFile);
ZipInputStream zin = new ZipInputStream(fin);
ZipEntry ze = null;
while ((ze = zin.getNextEntry()) != null) {
Log.v("Decompress", "Unzipping " + ze.getName());
if(ze.isDirectory()) {
_dirChecker(ze.getName());
} else {
FileOutputStream fout = new FileOutputStream(_location + ze.getName());
for (int c = zin.read(); c != -1; c = zin.read()) {
fout.write(c);
}
zin.closeEntry();
fout.close();
}
}
zin.close();
} catch(Exception e) {
Log.e("Decompress", "unzip", e);
}
}
private void _dirChecker(String dir) {
File f = new File(_location + dir);
if(!f.isDirectory()) {
f.mkdirs();
}
}
}
BTW我正在运行Android Studio（预览版）0.4.6 在此先感谢。
更新仍无效，正在寻找答案。
更新立即开始工作。
答案 0 :(得分：1)
这里的工作代码可以看..
MainActivity.java
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button=(Button)findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Utils.createDir(Environment.getExternalStorageDirectory().toString(),"Downloads");
Utils.createDir(Environment.getExternalStorageDirectory().toString()+"/Downloads", "Files");
String unzipLocation = Environment.getExternalStorageDirectory() +"/"+"Downloads"+"/"+"Files"+"/";
String zipFile =Environment.getExternalStorageDirectory() +"/"+"Downloads"+"/"+"Files"+"."+"zip";
String url="https://eventfo.com.au/index.php/userapi/api/eventdetaildownload/eventid/162/accesskey/534ccbcc10ab2/deviceId/85d2a504b2be7af4/deviceType/Android";
try {
new Utils().downloadEventData(MainActivity.this,zipFile, unzipLocation, url);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
}
UnzipUtil.java
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class UnzipUtil {
private String _zipFile;
private String _location;
public UnzipUtil(String zipFile, String location) {
_zipFile = zipFile;
_location = location;
_dirChecker("");
}
public void unzip() {
try {
FileInputStream fin = new FileInputStream(_zipFile);
ZipInputStream zin = new ZipInputStream(fin);
ZipEntry ze = null;
while ((ze = zin.getNextEntry()) != null) {
Log.v("Decompress", "Unzipping " + ze.getName());
if(ze.isDirectory()) {
_dirChecker(ze.getName());
} else {
FileOutputStream fout = new FileOutputStream(_location + ze.getName());
// for (int c = zin.read(); c != -1; c = zin.read()) {
// fout.write(c);
byte[] buffer = new byte[8192];
int len;
while ((len = zin.read(buffer)) != -1) {
fout.write(buffer, 0, len);
}
fout.close();
// }
zin.closeEntry();
// fout.close();
}
}
zin.close();
} catch(Exception e) {
Log.e("Decompress", "unzip", e);
}
}
private void _dirChecker(String dir) {
File f = new File(_location + dir);
if(!f.isDirectory()) {
f.mkdirs();
}
}
}
Utils.java
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.AsyncTask;
import android.util.Log;
import android.view.Gravity;
import android.widget.TextView;
public class Utils
{
public static void createDir(String path,String dirName)
{
String newFolder = "/"+dirName;
File myNewFolder = new File(path + newFolder);
myNewFolder.mkdir();
}
public void downloadEventData(Context context,String zipFile,String unzipLocation,String url) throws IOException
{
try {
new DownloadMapAsync(context,zipFile,unzipLocation).execute(url);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private class DownloadMapAsync extends AsyncTask<String, String, String> {
String result ="";
Context context;
String zipFile;
String unzipLocation;
private ProgressDialog progressDialog;
String string;
public DownloadMapAsync(Context context,String zipFile,String unzipLocation) {
// TODO Auto-generated constructor stub
this.context=context;
this.zipFile=zipFile;
this.unzipLocation=unzipLocation;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Downloading Zip File..");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setCancelable(false);
progressDialog.show();
}
@Override
protected String doInBackground(String... aurl) {
int count;
HttpURLConnection http = null;
try {
URL url = new URL(aurl[0]);
if (url.getProtocol().toLowerCase().equals("https")) {
trustAllHosts();
HttpsURLConnection https = (HttpsURLConnection) url.openConnection();
https.setHostnameVerifier(DO_NOT_VERIFY);
http = https;
} else {
http = (HttpURLConnection) url.openConnection();
}
http.connect();
if (http.getResponseCode()==200)
{
int lenghtOfFile = http.getContentLength();
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(zipFile);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress(""+(int)((total*100)/lenghtOfFile));
output.write(data, 0, count);
}
output.close();
input.close();
result = "true";
}
else if (http.getResponseCode()==401)
{
result = "false";
string= "Download Limit exceed.";
}
else
{
result = "false";
string=http.getResponseMessage();
}
} catch (Exception e) {
e.printStackTrace();
result = "false";
try {
if (http.getResponseCode()==401)
{
string= "Download Failed";
} else {
string=e.toString();
}
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
return result;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC",progress[0]);
progressDialog.setProgress(Integer.parseInt(progress[0]));
}
@Override
protected void onPostExecute(String unused) {
progressDialog.dismiss();
if(result.equalsIgnoreCase("true"))
{
try {
unzip(context,zipFile,unzipLocation);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
customAlert(context, string);
}
}
}
@SuppressLint("NewApi")
public void customAlert(Context context,String msgString)
{
AlertDialog.Builder alertDialog2 = new AlertDialog.Builder(context,AlertDialog.THEME_DEVICE_DEFAULT_LIGHT);
TextView title = new TextView(context);
title.setText("Message");
title.setPadding(10, 10, 10, 10);
title.setGravity(Gravity.CENTER);
title.setTextColor(Color.BLACK);
title.setTextSize(20);
alertDialog2.setCustomTitle(title);
TextView msg = new TextView(context);
msg.setText(msgString);
msg.setPadding(10, 10, 10, 10);
msg.setGravity(Gravity.CENTER);
msg.setTextSize(18);
msg.setTextColor(Color.BLACK);
alertDialog2.setView(msg);
alertDialog2.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog2.show();
}
public void unzip(Context context,String zipFile,String unzipLocation) throws IOException
{
new UnZipTask(context,zipFile).execute(unzipLocation);
}
private class UnZipTask extends AsyncTask<String, Void, Boolean> {
Context context;
String zipFile;
ProgressDialog progressDialog;
public UnZipTask(Context context,String zipFile) {
// TODO Auto-generated constructor stub
this.context=context;
this.zipFile=zipFile;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(context);
progressDialog.setMessage("Please Wait...Extracting zip file ... ");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.setCancelable(false);
progressDialog.show();
}
protected Boolean doInBackground(String... params)
{
String filePath = zipFile;
String destinationPath = params[0];
File archive = new File(filePath);
try {
ZipFile zipfile = new ZipFile(archive);
for (@SuppressWarnings("rawtypes")
Enumeration e = zipfile.entries(); e.hasMoreElements();) {
ZipEntry entry = (ZipEntry) e.nextElement();
unzipEntry(zipfile, entry, destinationPath);
}
UnzipUtil d = new UnzipUtil(zipFile,params[0]);
d.unzip();
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
@Override
protected void onPostExecute(Boolean result)
{
progressDialog.dismiss();
File file=new File(zipFile);
file.delete();
customAlert(context,"Unzipping completed");
}
private void unzipEntry(ZipFile zipfile, ZipEntry entry,String outputDir) throws IOException
{
if (entry.isDirectory()) {
createDir(new File(outputDir, entry.getName()));
return;
}
File outputFile = new File(outputDir, entry.getName());
if (!outputFile.getParentFile().exists()) {
createDir(outputFile.getParentFile());
}
BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry));
BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));
try {
} finally {
outputStream.flush();
outputStream.close();
inputStream.close();
}
}
public void createDir(File dir)
{
if (dir.exists()) {
return;
}
if (!dir.mkdirs()) {
throw new RuntimeException("Can not create dir " + dir);
}
}
}
final static HostnameVerifier DO_NOT_VERIFY = new HostnameVerifier()
{
public boolean verify(String hostname, SSLSession session) {
return true;
}
};
private static void trustAllHosts() {
// Create a trust manager that does not validate certificate chains
TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return new java.security.cert.X509Certificate[] {};
}
public void checkClientTrusted(X509Certificate[] chain,
String authType) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain,
String authType) throws CertificateException {
}
} };
// Install the all-trusting trust manager
try {
SSLContext sc = SSLContext.getInstance("TLS");
sc.init(null, trustAllCerts, new java.security.SecureRandom());
HttpsURLConnection
.setDefaultSSLSocketFactory(sc.getSocketFactory());
} catch (Exception e) {
e.printStackTrace();
}
}
}
的Manifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.downloadzipunzip"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.downloadzipunzip.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
希望这段代码可以帮助你..