android 下载应用 通知栏显示进度 下完之后点击安装 （很实用）

先看效果图： 这是本人的习惯，先上图显示效果，看是否是想要的，再看代码。有图有真相

代码：

Main:

package com.gem.hsx.appupdate;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class Main extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Button btnok=(Button) findViewById(R.id.btnok);btnok.setOnClickListener(new BtnokOnClickListener());}private class BtnokOnClickListener implements OnClickListener {@Overridepublic void onClick(View v) {Intent updateIntent =new Intent(Main.this, UpdateService.class);updateIntent.putExtra("titleId",R.string.app_name);startService(updateIntent);}}}

UpdateService:

package com.gem.hsx.appupdate;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;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;public class UpdateService extends Service{//标题private int titleId = 0;private final static int DOWNLOAD_COMPLETE = 0;private final static int DOWNLOAD_FAIL = 1; //文件存储private File updateDir = null;private File updateFile = null; //通知栏private NotificationManager updateNotificationManager = null;private Notification updateNotification = null;//通知栏跳转Intentprivate Intent updateIntent = null;private PendingIntent updatePendingIntent = null;@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {super.onCreate();}@Overridepublic 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(),"app/download/");        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, Main.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,"上海地铁","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);}private Handler updateHandler = new  Handler(){    @Override    public void handleMessage(Message msg) {     switch(msg.what){            case DOWNLOAD_COMPLETE:            updateNotification.flags|=updateNotification.FLAG_AUTO_CANCEL;                //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, "上海地铁", "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, "上海地铁", "下载完成,点击安装。", updatePendingIntent);                updateNotificationManager.notify(0, updateNotification);            default:                stopService(updateIntent);        }      }};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);            }        }    }public long downloadUpdateFile(String downloadUrl, File saveFile) throws Exception {        //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;                 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);                    updateNotificationManager.notify(0, updateNotification);                }                                    }        } finally {            if(httpConnection != null) {                httpConnection.disconnect();            }            if(is != null) {                is.close();            }            if(fos != null) {                fos.close();            }        }        return totalSize;    }}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.gem.hsx.appupdate"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="15" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.INTERNET"/>    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:name=".Main"            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="UpdateService"            android:label="@string/app_name" >        </service>    </application></manifest>