android 服务下载apk，安装

1.检测更新

接口获取相应的参数
apkName,下载地址 url

2.下载服务 看代码

public class DownAPKService extends Service {
private NotificationManager notificationMrg;
private Holder holder;
private String url;
private String apkName;
int flag = 0;

@Override
public void onCreate() {
    super.onCreate();
    notificationMrg = (NotificationManager) this.getSystemService(android.content.Context.NOTIFICATION_SERVICE);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    url = intent.getStringExtra("url");
    apkName = intent.getStringExtra("apkName");
    new Thread(new Runnable() {
        @Override
        public void run() {
            loadAPKFile(url, ++flag);
        }
    }).start();
    return START_STICKY;
}

public void loadAPKFile(String url, int flag) {
    Intent notificationIntent = new Intent(getApplicationContext(), this.getClass());
    // addflag设置跳转类型
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    // 创建Notifcation对象，设置图标，提示文字
    PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent, 0);
    Notification notification = new Notification(R.mipmap.app_icon, apkName, System.currentTimeMillis());
    // 出现在 “正在运行的”栏目下面
    notification.flags |= Notification.FLAG_ONGOING_EVENT;
    RemoteViews contentView = new RemoteViews(getPackageName(), R.layout.notification_version);
    contentView.setTextViewText(R.id.n_title, "下载:" + apkName);
    contentView.setTextViewText(R.id.n_text, "当前进度：0%");
    contentView.setProgressBar(R.id.n_progress, 100, 0, false);
    notification.contentView = contentView;
    notification.contentIntent = contentIntent;
    double m = 0.0;
    HttpClient client = new DefaultHttpClient();
    HttpGet get = new HttpGet(url);
    HttpResponse response;
    try {
        response = client.execute(get);
        HttpEntity entity = response.getEntity();
        double length = entity.getContentLength();
        InputStream is = entity.getContent();
        FileOutputStream fileOutputStream = null;
        File file = null;
        if (is != null) {
            file = new File(Environment.getExternalStorageDirectory(), "Market_Master_Android.apk");
        }
        fileOutputStream = new FileOutputStream(file);
        byte[] buf = new byte[ 1024];
        int ch = 0;
        float count = 0;
        while ((ch = is.read(buf)) != -1) {
            fileOutputStream.write(buf, 0, ch);
            count += ch;
            double temp = count / length;
            if (temp >= m) {
                m += 0.01;
                int load = (int) (count * 100 / length);
                // 函数调用handler发送信息
                sendMsg(1, load, url, notification, flag, null);
            }
        }
        Uri uri = Uri.fromFile(file);
        sendMsg(2, 0, url, notification, 0, file);
        fileOutputStream.flush();
        if (fileOutputStream != null) {
            fileOutputStream.close();
        }
    } catch (Exception e) {
        sendMsg(-1, 0, url, notification, 0, null);
    }
}

// 状态栏视图更新
private Notification displayNotificationMessage(Notification notification, int count, int flag, String url) {
    RemoteViews cView = notification.contentView;
    cView.setTextViewText(R.id.n_text, "当前进度：" + count + "% ");
    cView.setProgressBar(R.id.n_progress, 100, count, false);
    notification.contentView = cView;
    notificationMrg.notify(flag, notification);
    return notification;
}

private void sendMsg(int what, int c, String url, Notification notification, int flag, File file) {
    Message msg = new Message();
    msg.what = what;// 用来识别发送消息的类型
    holder = new Holder();
    holder.flag = flag;
    holder.count = c;
    holder.url = url;
    holder.notify = notification;
    holder.file = file;
    msg.obj = holder;// 消息传递的自定义对象信息
    handler.sendMessage(msg);
}

// 定义一个Handler，用于处理下载线程与主线程间通讯
private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        final Holder data = (Holder) msg.obj;
        if (!Thread.currentThread().isInterrupted()) {
            // 判断下载线程是否中断
            switch (msg.what) {
                case 1:
                    if (data.count >= 99) {
                        notificationMrg.cancel(data.flag);
                        break;
                    }
                    Notification notification = data.notify;
                    notification = displayNotificationMessage(notification, data.count, data.flag, data.url);
                    break;
                case 2:
                    Toast.makeText(getApplicationContext(), "下载成功", Toast.LENGTH_SHORT).show();
                    installApk(data.file);
                    break;
                case -1:
                    Toast.makeText(getApplicationContext(), "下载失败", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
        super.handleMessage(msg);
    }
};

// apk文件安装
public void installApk(File file) {

   /* Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    intent.setDataAndType(url, "application/vnd.android.package-archive");
    startActivity(intent);*/
    if(file.exists()){
        Log.i("test",file.getName()+"  "+file.getAbsolutePath()+" "+file.length());
        PathUtil.chmod("777",file.getPath());
        Intent intent = new Intent();
        // 执行动作
        intent.setAction(Intent.ACTION_VIEW);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //没有i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);这一步的话，最后安装好了，点打开，是不会打开新版本应用的。
        // 执行的数据类型
        Uri uri;
        if (Build.VERSION.SDK_INT >= 24) {
            uri = FileProvider.getUriForFile(this.getApplicationContext(),"net.mfinance.marketwatch.app.provider",file);
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);//添加这一句表示对目标应用临时授权该Uri所代表的文件
        } else {
            uri = Uri.fromFile(file);
        }
        intent.setDataAndType(uri, "application/vnd.android.package-archive");
        startActivity(intent);
        android.os.Process.killProcess(android.os.Process.myPid()); //没有android.os.Process.killProcess(android.os.Process.myPid());最后不会提示完成、打开。
    }

}

public class Holder {
    Notification notify;
    String url;
    int count;
    int flag;
    File file;
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

}