Android实现APP自动更新功能

现在一般的android软件都是需要不断更新的，当你打开某个app的时候，如果有新的版本，它会提示你有新版本需要更新。该小程序实现的就是这个功能。

该小程序的特点是，当有更新时，会弹出一个提示框，点击确定，则在通知来创建一个进度条进行下载，点击取消，则取消更新。

以下是详细代码:

1.创建布局文件notification_item.xml，用于在通知栏生成一个进度条和下载图标。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:padding="3dp" >

 <ImageView
  android:id="@+id/notificationImage"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@android:drawable/stat_sys_download" />

 <TextView
  android:id="@+id/notificationTitle"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignParentRight="true"
  android:layout_toRightOf="@id/notificationImage"
  android:paddingLeft="6dp"
  android:textColor="#FF000000" />

 <TextView
  android:id="@+id/notificationPercent"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_below="@id/notificationImage"
  android:paddingTop="2dp"
  android:textColor="#FF000000" />

 <ProgressBar
  android:id="@+id/notificationProgress"
  style="@style/ProgressBarHorizontal_color"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_alignLeft="@id/notificationTitle"
  android:layout_alignParentRight="true"
  android:layout_alignTop="@id/notificationPercent"
  android:layout_below="@id/notificationTitle"
  android:paddingLeft="6dp"
  android:paddingRight="3dp"
  android:paddingTop="2dp" />

</RelativeLayout>

2.创建AppContext类，该类继承自Application。

package com.test.application;

import android.app.Application;
import android.content.Context;

import com.test.update.config.Config;

public class AppContext extends Application {
 private static AppContext appInstance;
 private Context context;

 public static AppContext getInstance() {
  return appInstance;
 }

 @Override
 public void onCreate() {
  // TODO Auto-generated method stub
  super.onCreate();
  appInstance = this;
  context = this.getBaseContext();
//  // 获取当前版本号
//  try {
//   PackageInfo packageInfo = getApplicationContext()
//     .getPackageManager().getPackageInfo(getPackageName(), 0);
//   Config.localVersion = packageInfo.versionCode;
//   Config.serverVersion = 1;// 假定服务器版本为2，本地版本默认是1
//  } catch (NameNotFoundException e) {
//   e.printStackTrace();
//  }
  initGlobal();
 }

 public void initGlobal() {
  try {
   Config.localVersion = getPackageManager().getPackageInfo(
     getPackageName(), 0).versionCode; // 设置本地版本号
   Config.serverVersion = 2;// 假定服务器版本为2，本地版本默认是1--实际开发中是从服务器获取最新版本号，android具体与后端的交互见我另///外的博文
  } catch (Exception ex) {
   ex.printStackTrace();
  }
 }
}

3.创建配置文件类Config.java,在这个类里面定义一些与版本相关的常量

package com.test.update.config;

public class Config {
 //版本信息
 public static int localVersion = 0;
 public static int serverVersion = 0;
 /* 下载包安装路径 */
 public static final String savePath = "/sdcard/test/";

 public static final String saveFileName = savePath + "test.apk";
}

4.编写更新服务类UpdateServcie.java

package com.test.update;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.annotation.SuppressLint;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.widget.RemoteViews;

import com.test.update.config.Config;

public class UpdateService extends Service {
 // 标题
 private int titleId = 0;

 // 文件存储
 private File updateDir = null;
 private File updateFile = null;
 // 下载状态
 private final static int DOWNLOAD_COMPLETE = 0;
 private final static int DOWNLOAD_FAIL = 1;
 // 通知栏
 private NotificationManager updateNotificationManager = null;
 private Notification updateNotification = null;
 // 通知栏跳转Intent
 private Intent updateIntent = null;
 private PendingIntent updatePendingIntent = null;
 /***
  * 创建通知栏
  */
 RemoteViews contentView;
 // 这样的下载代码很多，我就不做过多的说明
 int downloadCount = 0;
 int currentSize = 0;
 long totalSize = 0;
 int updateTotalSize = 0;

 // 在onStartCommand()方法中准备相关的下载工作：
 @SuppressWarnings("deprecation")
 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
  // 获取传值
  titleId = intent.getIntExtra("titleId", 0);
  // 创建文件
  if (android.os.Environment.MEDIA_MOUNTED.equals(android.os.Environment
    .getExternalStorageState())) {
   updateDir = new File(Environment.getExternalStorageDirectory(),
     Config.saveFileName);
   updateFile = new File(updateDir.getPath(), getResources()
     .getString(titleId) + ".apk");
  }

  this.updateNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
  this.updateNotification = new Notification();

  // 设置下载过程中，点击通知栏，回到主界面
  updateIntent = new Intent(this, UpdateActivity.class);
  updatePendingIntent = PendingIntent.getActivity(this, 0, updateIntent,
    0);
  // 设置通知栏显示内容
  updateNotification.icon = R.drawable.ic_launcher;
  updateNotification.tickerText = "开始下载";
  updateNotification.setLatestEventInfo(this, "QQ", "0%",
    updatePendingIntent);
  // 发出通知
  updateNotificationManager.notify(0, updateNotification);

  // 开启一个新的线程下载，如果使用Service同步下载，会导致ANR问题，Service本身也会阻塞
  new Thread(new updateRunnable()).start();// 这个是下载的重点，是下载的过程

  return super.onStartCommand(intent, flags, startId);
 }

 @Override
 public IBinder onBind(Intent arg0) {
  // TODO Auto-generated method stub
  return null;
 }

 @SuppressLint("HandlerLeak")
 private Handler updateHandler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
   switch (msg.what) {

   case DOWNLOAD_COMPLETE:
    // 点击安装PendingIntent
    Uri uri = Uri.fromFile(updateFile);
    Intent installIntent = new Intent(Intent.ACTION_VIEW);
    installIntent.setDataAndType(uri,
      "application/vnd.android.package-archive");

    updatePendingIntent = PendingIntent.getActivity(
      UpdateService.this, 0, installIntent, 0);

    updateNotification.defaults = Notification.DEFAULT_SOUND;// 铃声提醒
    updateNotification.setLatestEventInfo(UpdateService.this,
      "QQ", "下载完成,点击安装。", updatePendingIntent);
    updateNotificationManager.notify(0, updateNotification);

    // 停止服务
    stopService(updateIntent);
   case DOWNLOAD_FAIL:
    // 下载失败
    updateNotification.setLatestEventInfo(UpdateService.this,
      "QQ", "下载完成,点击安装。", updatePendingIntent);
    updateNotificationManager.notify(0, updateNotification);
   default:
    stopService(updateIntent);
   }
  }
 };

 public long downloadUpdateFile(String downloadUrl, File saveFile)
   throws Exception {

  HttpURLConnection httpConnection = null;
  InputStream is = null;
  FileOutputStream fos = null;

  try {
   URL url = new URL(downloadUrl);
   httpConnection = (HttpURLConnection) url.openConnection();
   httpConnection
     .setRequestProperty("User-Agent", "PacificHttpClient");
   if (currentSize > 0) {
    httpConnection.setRequestProperty("RANGE", "bytes="
      + currentSize + "-");
   }
   httpConnection.setConnectTimeout(10000);
   httpConnection.setReadTimeout(20000);
   updateTotalSize = httpConnection.getContentLength();
   if (httpConnection.getResponseCode() == 404) {
    throw new Exception("fail!");
   }
   is = httpConnection.getInputStream();
   fos = new FileOutputStream(saveFile, false);
   byte buffer[] = new byte[4096];
   int readsize = 0;
   while ((readsize = is.read(buffer)) > 0) {
    fos.write(buffer, 0, readsize);
    totalSize += readsize;
    // 为了防止频繁的通知导致应用吃紧，百分比增加10才通知一次
    if ((downloadCount == 0)
      || (int) (totalSize * 100 / updateTotalSize) - 10 > downloadCount) {
     downloadCount += 10;

     updateNotification.setLatestEventInfo(UpdateService.this,
       "正在下载", (int) totalSize * 100 / updateTotalSize
         + "%", updatePendingIntent);


     /***
      * 在这里我们用自定的view来显示Notification
      */
     updateNotification.contentView = new RemoteViews(
       getPackageName(), R.layout.notification_item);
     updateNotification.contentView.setTextViewText(
       R.id.notificationTitle, "正在下载");
     updateNotification.contentView.setProgressBar(
       R.id.notificationProgress, 100, downloadCount, false);

     updateNotificationManager.notify(0, updateNotification);
    }
   }
  } finally {
   if (httpConnection != null) {
    httpConnection.disconnect();
   }
   if (is != null) {
    is.close();
   }
   if (fos != null) {
    fos.close();
   }
  }
  return totalSize;
 }

 class updateRunnable implements Runnable {
  Message message = updateHandler.obtainMessage();

  public void run() {
   message.what = DOWNLOAD_COMPLETE;


   try {
    // 增加权限<USES-PERMISSION
    // android:name="android.permission.WRITE_EXTERNAL_STORAGE">;
    if (!updateDir.exists()) {
     updateDir.mkdirs();
    }
    if (!updateFile.exists()) {
     updateFile.createNewFile();
    }
    // 下载函数，以QQ为例子
    // 增加权限<USES-PERMISSION
    // android:name="android.permission.INTERNET">;
    long downloadSize = downloadUpdateFile(
      "http://softfile.3g.qq.com:8080/msoft/179/1105/10753/MobileQQ1.0(Android)_Build0198.apk",
      updateFile);
    if (downloadSize > 0) {
     // 下载成功
     updateHandler.sendMessage(message);
    }
   } catch (Exception ex) {
    ex.printStackTrace();
    message.what = DOWNLOAD_FAIL;
    // 下载失败
    updateHandler.sendMessage(message);
   }
  }
 }
}

5.编写活动类UpdateActivity

package com.test.update;

import com.test.update.config.Config;

import android.support.v4.app.Fragment;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;

public class UpdateActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  checkVersion();
 }

 /**
  * 检查更新版本
  */
 public void checkVersion() {

  if (Config.localVersion < Config.serverVersion) {
   Log.i("hgncxzy", "==============================");
   // 发现新版本，提示用户更新
   AlertDialog.Builder alert = new AlertDialog.Builder(this);
   alert.setTitle("软件升级")
     .setMessage("发现新版本,建议立即更新使用.")
     .setPositiveButton("更新",
       new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,
          int which) {
         // 开启更新服务UpdateService
         // 这里为了把update更好模块化，可以传一些updateService依赖的值
         // 如布局ID，资源ID，动态获取的标题,这里以app_name为例
         Intent updateIntent = new Intent(
           UpdateActivity.this,
           UpdateService.class);
         updateIntent.putExtra("titleId",
           R.string.app_name);
         startService(updateIntent);
        }
       })
     .setNegativeButton("取消",
       new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,
          int which) {
         dialog.dismiss();
        }
       });
   alert.create().show();
  } else {
   // 清理工作，略去
   // cheanUpdateFile()
  }
 }
}

6.添加权限以及将服务静态加载(在配置文件中加载)。

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

注册服务

<service android:name="com.test.update.UpdateService" >
  </service>

完整的AndroidManifest.xml文件如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.test.update"
 android:versionCode="1"
 android:versionName="1.0" >

 <uses-sdk
  android:minSdkVersion="8"
  android:targetSdkVersion="8" />

 <application
  android:name="com.test.application.AppContext"
  android:icon="@drawable/ic_launcher"
  android:label="@string/app_name" >
  <activity
   android:name="com.test.update.UpdateActivity"
   android:label="@string/app_name" >
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />

    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>
  <service android:name="com.test.update.UpdateService" >
  </service>
 </application>

 <uses-permission android:name="android.permission.INTERNET" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

</manifest>

到此编码结束。

源码下载：Android实现APP自动更新功能

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服务器之家。

原文链接：https://blog.csdn.net/jdfkldjlkjdl/article/details/43232319