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这期内容当中小编将会给大家带来有关怎么在Android应用中实现一个程序更新下载功能，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。
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创建一个新类，名为UpdateManager，代码如下：
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import com.af.mobile.R;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;
public class UpdateManager
{private URL url=null;
/* 下载中 */
private static final int DOWNLOAD = 1;
/* 下载结束 */
private static final int DOWNLOAD_FINISH = 2;
/* 保存解析的XML信息 */
//HashMap mHashMap;
/* 下载保存路径 */
private String mSavePath;
/* 记录进度条数量 */
private int progress;
/* 是否取消更新 */
private boolean cancelUpdate = false;
private Context mContext;
/* 更新进度条 */
private ProgressBar mProgress;
private Dialog mDownloadDialog;
private Handler mHandler = new Handler()
{
public void handleMessage(Message msg)
{
switch (msg.what)
{
// 正在下载
case DOWNLOAD:
// 设置进度条位置
mProgress.setProgress(progress);
break;
case DOWNLOAD_FINISH:
// 安装文件
installApk();
break;
default:
break;
}
};
};
public UpdateManager(Context context)
{
this.mContext = context;
}
public void checkUpdate()
{
if (isUpdate())
{
showNoticeDialog();
} else
{
}
}
/**
* 检查软件是否有更新版本
*
* @return
*/
private boolean isUpdate()
{
// 获取当前软件版本
Double versionCode = getVersionCode(mContext);
Double serviceCode = 1.2;
// 版本判断
if (serviceCode > versionCode)
{
return true;
}
return false;
}
// 获取软件版本号
private Double getVersionCode(Context context)
{
Double versionCode = 0.0;
try
{
// 获取软件版本号，对应AndroidManifest.xml下android:versionCode
versionCode = (double) context.getPackageManager().getPackageInfo("com.af.mobile", 0).versionCode;
} catch (NameNotFoundException e)
{
e.printStackTrace();
}
return versionCode;
}
//显示软件更新对话框
private void showNoticeDialog()
{
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle("软件更新");
String string=download("http://192.168.0.102:9313/daojuserver/uploads/version.xml");//xml的下载地址
builder.setMessage(string);
builder.setPositiveButton("更新", new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
// 显示下载对话框
showDownloadDialog();
}
});
// 稍后更新
builder.setNegativeButton("稍后更新", new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
}
});
Dialog noticeDialog = builder.create();
noticeDialog.show();
}
// 显示软件下载对话框
private void showDownloadDialog()
{
// 构造软件下载对话框
AlertDialog.Builder builder = new Builder(mContext);
builder.setTitle("djfkjd");//提示信息内容
// 给下载对话框增加进度条
final LayoutInflater inflater = LayoutInflater.from(mContext);
View v = inflater.inflate(R.layout.softupdate_progress, null);
mProgress = (ProgressBar) v.findViewById(R.id.update_progress);
builder.setView(v);
// 取消更新
builder.setNegativeButton("取消更新", new OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
// 设置取消状态
cancelUpdate = true;
}
});
mDownloadDialog = builder.create();
mDownloadDialog.show();
// 现在文件
downloadApk();
}
private void downloadApk()
{
// 启动新线程下载软件
new downloadApkThread().start();
}
private class downloadApkThread extends Thread
{
@Override
public void run()
{
try
{
// 判断SD卡是否存在，并且是否具有读写权限
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
{
// 获得存储卡的路径
String sdpath = Environment.getExternalStorageDirectory() + "/";
mSavePath = sdpath + "download";
URL url = new URL("http://192.168.0.102:9313/daojuserver/uploads/SpMobile.apk");//apk下载地址地址
// 创建连接
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.connect();
// 获取文件大小
int length = conn.getContentLength();
// 创建输入流
InputStream is = conn.getInputStream();
File file = new File(mSavePath);
if (!file.exists())
{
file.mkdir();
}
File apkFile = new File(mSavePath, "dhfudh");
FileOutputStream fos = new FileOutputStream(apkFile);
int count = 0;
// 缓存
byte buf[] = new byte[1024];
// 写入到文件中
do
{
int numread = is.read(buf);
count += numread;
// 计算进度条位置
progress = (int) (((float) count / length) * 100);
// 更新进度
mHandler.sendEmptyMessage(DOWNLOAD);
if (numread <= 0)
{
mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
break;
}
fos.write(buf, 0, numread);
} while (!cancelUpdate);
fos.close();
is.close();
}
} catch (MalformedURLException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
// 取消下载对话框显示
mDownloadDialog.dismiss();
}
};
private void installApk()
{
File apkfile = new File(mSavePath, "dhfudh");
if (!apkfile.exists())
{
return;
}
// 通过Intent安装APK文件
Intent i = new Intent(Intent.ACTION_VIEW);
i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");
mContext.startActivity(i);
}
public String download(String urlString)
{
StringBuffer sbBuffer=new StringBuffer();
String line=null;
BufferedReader buffer=null;
try {
url=new URL(urlString);
HttpURLConnection urlConn=(HttpURLConnection) url.openConnection();
buffer=new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
while((line=buffer.readLine())!=null)
{
sbBuffer.append(line);
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
finally
{
try {
buffer.close();
} catch (Exception e2) {
// TODO: handle exception
e2.printStackTrace();
}
}
return sbBuffer.toString();
}
} 在Android应用程序Main界面
if(isOpenNetwork())//判断是否有网络
{
UpdateManager manager = new UpdateManager(Main.this);
// 检查软件更新
manager.checkUpdate();
}判断移动端是否有网络
private boolean isOpenNetwork() {
ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connManager.getActiveNetworkInfo();
if (networkInfo != null) {
// 2.获取当前网络连接的类型信息
int networkType = networkInfo.getType();
if (ConnectivityManager.TYPE_WIFI == networkType) {
// 当前为wifi网络
} else if (ConnectivityManager.TYPE_MOBILE == networkType) {
// 当前为mobile网络
}
return connManager.getActiveNetworkInfo().isAvailable();
}
return false;
}上述就是小编为大家分享的怎么在Android应用中实现一个程序更新下载功能了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注创新互联行业资讯频道。
