android-async-http项目地址 https://github.com/loopj/android-async-http。android-async-http顾名思义是异步的http请求，只是它也支持同步请求的，本文主要使用了android-async-http做异步请求下载文件。每当app须要更新新版本号的时候。就须要用到下载功能的，经研究android-async-http这个第三方开源项目还是挺好用的，这里介绍给大家。
1、下载类DownloadManager.java
package com.figo.study.latin.mgr;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import org.apache.http.Header;
import android.content.Context;
import android.net.ConnectivityManager;
import android.os.Environment;
import com.figo.study.R;
import com.android.inputmethod.latin.model.AsyncDownload;
import com.figo.study.util.FileUtil;
import com.figo.study.util.NetworkUtil;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.FileAsyncHttpResponseHandler;
/**
* 异步下载类
* @author figo
*
*/
public class DownloadManager {
private boolean mUseWifiOnly = false;
public DownloadManager() {
}
private HashMap<String, AsyncDownload> asyncDownlaods = null;
public void init() {
asyncDownlaods = new HashMap<String, AsyncDownload>();
}
public void download(final Context context, String url, final String md5, String dirPath, String fileName, final DownloadListener callback) {
try {
callback.onStart();
if (!NetworkUtil.isNetworkUseful(context)) {
callback.onError(context.getString(R.string.lbl_network_useless));
}
if (mUseWifiOnly) {
if (NetworkUtil.getNetworkType(context) != ConnectivityManager.TYPE_WIFI) {
callback.onError(context.getString(R.string.lbl_not_support));
}
return;
}
String sdPath = Environment.getExternalStorageDirectory() + "/";
AsyncHttpClient client =new AsyncHttpClient();
if (!asyncDownlaods.containsKey(url)) {
AsyncDownload asyncDownload = new AsyncDownload();
asyncDownload.setAsyncHttpClient(client);
asyncDownload.setFileName(sdPath + dirPath + fileName);
asyncDownlaods.put(url, asyncDownload);
}else
{
client=asyncDownlaods.get(url).getAsyncHttpClient();
}
File file = new File(sdPath + dirPath, fileName);
try {
FileUtil.createSDDir(dirPath);
file = FileUtil.createSDFile(dirPath + fileName);
} catch (IOException e1) {
if (e1 != null) {
e1.printStackTrace();
}
}
FileAsyncHttpResponseHandler fileAsyncHttpResponseHandler = new FileAsyncHttpResponseHandler(file) {
@Override
public void onCancel() {
super.onCancel();
System.out.print("cancel success!");
}
@Override
public void onProgress(int bytesWritten, int totalSize) {
super.onProgress(bytesWritten, totalSize);
int currentProgress = (int) ((bytesWritten * 1.0f / totalSize) * 100);
callback.onProgress(currentProgress);
}
@Override
public void onStart() {
super.onStart();
}
@Override
public void onFailure(int arg0, Header[] arg1, Throwable arg2, File arg3) {
if (arg2 != null) {
arg2.printStackTrace();
}
if (arg2 != null) {
callback.onError(arg2.getMessage());
} else {
callback.onError(context.getString(R.string.lbl_network_error));
}
}
@Override
public void onSuccess(int arg0, Header[] arg1, File arg2) {
String md5String = "";
try {
md5String = FileUtil.getFileMD5String(arg2);
} catch (Exception e) {
if (e != null) {
e.printStackTrace();
}
}
// if (md5.equals(md5String) == false) {
// callback.onError(context.getString(R.string.lbl_md5_error));
// } else {
// callback.onSuccess();
// }
//測试放开
callback.onSuccess();
}
};
client.setEnableRedirects(true);//同意反复下载
client.get(context, url, fileAsyncHttpResponseHandler);
} catch (Exception e) {
callback.onError(context.getString(R.string.lbl_system_err));
}
}
public void setDownloadWifiOnly(boolean value) {
mUseWifiOnly = value;
}
public void cancelDownload(Context context, String url) {
try {
if (asyncDownlaods != null && asyncDownlaods.containsKey(url)) {
//已经下载的文件删除
FileUtil.deleteFile(asyncDownlaods.get(url).getFileName());
//取消当前下载
AsyncHttpClient client = asyncDownlaods.get(url).getAsyncHttpClient();
if (client != null) {
client.cancelRequests(context, true);
}
//当前key删除
asyncDownlaods.remove(url);
}
} catch (Exception e) {
if (e != null) {
e.printStackTrace();
}
}
}
}
2、下载监听类DownloadListener.java
public interface DownloadListener {
public void onStart();
public void onError(String errMessage);
public void onSuccess();
public void onProgress(int progress);
}
/**
*
*/
package com.figo.study.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import android.os.Environment;
/**
* @author figo
*
*/
public class FileUtil {
//得到当前外部存储设备的文件夹( /SDCARD )
static String SDPATH = Environment.getExternalStorageDirectory() + "/";
/**
* 默认的password字符串组合，用来将字节转换成 16 进制表示的字符,apache校验下载的文件的正确性用的就是默认的这个组合
*/
protected static char hexDigits[] = {
'0',
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'a',
'b',
'c',
'd',
'e',
'f' };
protected static MessageDigest messagedigest = null;
static {
try {
messagedigest = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
public static String getFileMD5String(File file) throws IOException {
InputStream fis;
fis = new FileInputStream(file);
byte[] buffer = new byte[1024];
int numRead = 0;
while ((numRead = fis.read(buffer)) > 0) {
messagedigest.update(buffer, 0, numRead);
}
fis.close();
return bufferToHex(messagedigest.digest());
}
private static String bufferToHex(byte bytes[]) {
return bufferToHex(bytes, 0, bytes.length);
}
private static String bufferToHex(byte bytes[], int m, int n) {
StringBuffer stringbuffer = new StringBuffer(2 * n);
int k = m + n;
for (int l = m; l < k; l++) {
appendHexPair(bytes[l], stringbuffer);
}
return stringbuffer.toString();
}
private static void appendHexPair(byte bt, StringBuffer stringbuffer) {
char c0 = hexDigits[(bt & 0xf0) >> 4];// 取字节中高 4 位的数字转换
// 为逻辑右移，将符号位一起右移,此处未发现两种符号有何不同
char c1 = hexDigits[bt & 0xf];// 取字节中低 4 位的数字转换
stringbuffer.append(c0);
stringbuffer.append(c1);
}
public static void main(String[] args) throws IOException {
File file = new File("E:/test/crm_account_YYYY_MM_DD.txt");
String md5 = getFileMD5String(file);
System.out.println("md5:" + md5);
}
/**
* 在SD卡上创建文件
* @param fileName
* @return
* @throws IOException
*/
public static File createSDFile(String fileName) throws IOException {
File file = new File(SDPATH + fileName);
if(file.exists())
{
final File to = new File(file.getAbsolutePath() + System.currentTimeMillis());
file.renameTo(to);
to.delete();
// file.delete();
}
file.createNewFile();
return file;
}
/**
* 在SD卡上创建文件夹
* @param dirName
* @return
*/
public static File createSDDir(String dirName) {
File dir = new File(SDPATH + dirName);
if(!dir.exists())
{
dir.mkdirs();
}
return dir;
}
/**
* 推断SD卡上的文件夹是否存在
* @param fileName
* @return
*/
public boolean isFileExist(String fileName) {
File file = new File(SDPATH + fileName);
return file.exists();
}
/**
* 删除文件
* @param fileName
* @return
*/
public static void deleteFile(String fileName) {
try {
File file = new File(fileName);
if(file.exists())
{
file.delete();
}
} catch (Exception e) {
if(e!=null)
{
e.printStackTrace();
}
}
}
}
4、网络管理类NetworkUtil.java
public class NetworkUtil {
public static int getNetworkType(Context mContext) {
try {
final ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
return networkInfo.getType();
} catch (Exception e) {
return ConnectivityManager.TYPE_WIFI;
}
}
public static boolean isNetworkUseful(Context mContext)
{
final ConnectivityManager connectivityManager = (ConnectivityManager) mContext
.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo mobNetInfoActivity = connectivityManager
.getActiveNetworkInfo();
if (mobNetInfoActivity == null || !mobNetInfoActivity.isAvailable()) {
return false;
}else
{
return true;
}
}
}5、測试TestDownloadActivity.java
/**
*
*/
package com.figo.study.activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.figo.study.R;
import com.android.inputmethod.latin.mgr.DownloadListener;
import com.android.inputmethod.latin.view.HorizontalProgressBarWithNumber;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.FileAsyncHttpResponseHandler;
/**
* @author avazu
*
*/
public class TestDownloadActivity extends Activity {
private HorizontalProgressBarWithNumber mProgressBar, mProgressBar1;
private Button btnDownload, btnCancel, btn_pause_continue, btnDownload1, btnCancel1;
AsyncHttpClient client = new AsyncHttpClient();
FileAsyncHttpResponseHandler fileAsyncHttpResponseHandler = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_download_test);
initView();
}
private void initView() {
mProgressBar = (HorizontalProgressBarWithNumber) findViewById(R.id.id_progressbar);
mProgressBar1 = (HorizontalProgressBarWithNumber) findViewById(R.id.id_progressbar1);
// btn_pause_continue = (Button) findViewById(R.id.btn_pause_continue);
// btn_pause_continue.setOnClickListener(new OnClickListener() {
//
// @Override
// public void onClick(View v) {
// // TODO Auto-generated method stub
// fileAsyncHttpResponseHandler.sendRetryMessage(0);
// }
// });
final String url = "http://dl.wandoujia.com/files/phoenix/latest/wandoujia-wandoujia_web.apk?timestamp=1409388568830";
final String md5 = "";
final String dirPath = "study/download/";
final String fileName = "豌豆荚.apk";
btnDownload = (Button) findViewById(R.id.btn_download);
try {
btnDownload.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
BaseSkinApplication.shared().getDm().setDownloadWifiOnly(false);
BaseSkinApplication.shared().getDm().download(TestDownloadActivity.this, url, md5, dirPath, fileName, new DownloadListener() {
@Override
public void onStart() {
btnDownload.setVisibility(View.GONE);
btnCancel.setVisibility(View.VISIBLE);
}
@Override
public void onError(String errMessage) {
}
@Override
public void onSuccess() {
}
@Override
public void onProgress(int progress) {
mProgressBar.setProgress(progress);
}
});
}
});
} catch (Exception e) {
e.printStackTrace();
}
final String url1 = "http://msoftdl.360.cn/mobilesafe/shouji360/360safesis/360MobileSafe.apk";
final String md51 = "";
final String dirPath1 = "study/download/";
final String fileName1 = "360.apk";
btnDownload1 = (Button) findViewById(R.id.btn_download1);
try {
btnDownload1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
BaseSkinApplication.shared().getDm().setDownloadWifiOnly(false);
BaseSkinApplication.shared().getDm().download(TestDownloadActivity.this, url1, md51, dirPath1, fileName1, new DownloadListener() {
@Override
public void onStart() {
btnDownload1.setVisibility(View.GONE);
btnCancel1.setVisibility(View.VISIBLE);
}
@Override
public void onError(String errMessage) {
}
@Override
public void onSuccess() {
}
@Override
public void onProgress(int progress) {
mProgressBar1.setProgress(progress);
}
});
}
});
} catch (Exception e) {
e.printStackTrace();
}
btnCancel = (Button) findViewById(R.id.btn_cancel);
btnCancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
BaseSkinApplication.shared().getDm().cancelDownload(TestDownloadActivity.this, url);
btnDownload.setVisibility(View.VISIBLE);
btnCancel.setVisibility(View.GONE);
}
});
btnCancel1 = (Button) findViewById(R.id.btn_cancel1);
btnCancel1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
BaseSkinApplication.shared().getDm().cancelDownload(TestDownloadActivity.this, url1);
btnDownload1.setVisibility(View.VISIBLE);
btnCancel1.setVisibility(View.GONE);
}
});
}
}