本篇文章是直接下载最新的APK安装的方法,并不是增量下载该APk。
想要实现一个android应用,自动更新下载APK软件的方法,我采取的是以下几步方法:
1.每次进入主界面时,获取服务器的数据,看是否是最新版本,是,则无操作,否,则进行以下步骤;
2.弹出是否更新软件的对话框,点击下载后
3.弹出下载的进度条的对话框,开始下载,可以上随时点击按钮,停止下载
4.下载完成后,调用系统安装软件的服务,安装软件
效果图:
实现过程:
新建一个UpdateManager方法,具体内容我已经有详细的注释
package lgx.acc.updatedemo; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Handler; import android.view.LayoutInflater; import android.view.View; import android.widget.ProgressBar; import android.widget.TextView; public class UpdateManager { // 应用程序Context private Context mContext; // 是否是最新的应用,默认为false private boolean isNew = false; private boolean intercept = false; // 下载安装包的网络路径 private String apkUrl = "http://shouji.360tpcdn.com/360sj/tpi/20130201/" + "com.flikie.wallpapers.gallery_4.apk"; // 保存APK的文件夹 private static final String savePath = "/sdcard/updatedemo/"; private static final String saveFileName = savePath + "UpdateDemoRelease.apk"; // 下载线程 private Thread downLoadThread; private int progress;// 当前进度 TextView text; // 进度条与通知UI刷新的handler和msg常量 private ProgressBar mProgress; private static final int DOWN_UPDATE = 1; private static final int DOWN_OVER = 2; public UpdateManager(Context context) { mContext = context; } /** * 检查是否更新的内容 */ public void checkUpdateInfo() { //这里的isNew本来是要从服务器获取的,我在这里先假设他需要更新 if (isNew) { return; } else { showUpdateDialog(); } } /** * 显示更新程序对话框,供主程序调用 */ private void showUpdateDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(mContext); builder.setTitle("软件版本更新"); builder.setMessage("有最新的软件包,请下载!"); builder.setPositiveButton("下载", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { showDownloadDialog(); } }); builder.setNegativeButton("以后再说", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); builder.create().show(); } /** * 显示下载进度的对话框 */ private void showDownloadDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(mContext); builder.setTitle("软件版本更新"); LayoutInflater inflater = LayoutInflater.from(mContext); View v = inflater.inflate(R.layout.progress, null); mProgress = (ProgressBar) v.findViewById(R.id.progress); builder.setView(v); builder.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { intercept = true; } }); builder.show(); downloadApk(); } /** * 从服务器下载APK安装包 */ private void downloadApk() { downLoadThread = new Thread(mdownApkRunnable); downLoadThread.start(); } private Runnable mdownApkRunnable = new Runnable() { @Override public void run() { URL url; try { url = new URL(apkUrl); HttpURLConnection conn = (HttpURLConnection) url .openConnection(); conn.connect(); int length = conn.getContentLength(); InputStream ins = conn.getInputStream(); File file = new File(savePath); if (!file.exists()) { file.mkdir(); } File apkFile = new File(saveFileName); FileOutputStream fos = new FileOutputStream(apkFile); int count = 0; byte[] buf = new byte[1024]; while (!intercept) { int numread = ins.read(buf); count += numread; progress = (int) (((float) count / length) * 100); // 下载进度 mHandler.sendEmptyMessage(DOWN_UPDATE); if (numread <= 0) { // 下载完成通知安装 mHandler.sendEmptyMessage(DOWN_OVER); break; } fos.write(buf, 0, numread); } fos.close(); ins.close(); } catch (Exception e) { e.printStackTrace(); } } }; /** * 安装APK内容 */ private void installAPK() { File apkFile = new File(saveFileName); if (!apkFile.exists()) { return; } Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.parse("file://" + apkFile.toString()), "application/vnd.android.package-archive"); mContext.startActivity(intent); }; private Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) { switch (msg.what) { case DOWN_UPDATE: mProgress.setProgress(progress); break; case DOWN_OVER: installAPK(); break; default: break; } } }; }
还有progressBar.xml的具体代码
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ProgressBar android:id="@+id/progress" style="?android:attr/progressBarStyleHorizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>
之后在MainActivity的onCreate方法中,调用一下代码即可
UpdateManager manager=new UpdateManager(MainActivity.this); manager.checkUpdateInfo();
一定要记得在manifest里面加权限哈,
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
最后效果就出来了。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持找一找教程网。