最近聽說友盟的自動更新後期會不讓用了，所以自己謝了一個帶有進度條通知欄的檢查更新，請大家多提意見，話不多說，上程式碼。
首先，要去後臺獲取檢查的介面判斷是否要更新，如果需要更新，如下；

                        String ver;//該引數為最新的版本號
                        String url;//最新apk的檔案地址
                        String notes;//要顯示的更新日誌

                        UpdateManager manager = new UpdateManager(ver, url, notes, EasyHomeworkActivity.this);
                        // 檢查軟體更新
 

                        manager.checkUpdate();

第二步，彈出檢查更新對話方塊選擇更新並在通知欄顯示進度
UpdateManager類基本就是封裝好的一個完善的更新類

package com.easyhomework.more.data;

import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import
 
 android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import
 
 android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.RemoteViews;
import android.widget.Toast;

import com.easyhomework.R;
import com.easyhomework.context.EasyHomeworkActivity;

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

/**
 * 作者：lff
 * 時間；2016-4-11 14:38
 * 描述：檢查更新
 */
public class UpdateManager {

    /* 下載中 */
    private static final int DOWNLOAD = 1;
    /* 下載結束 */
    private static final int DOWNLOAD_FINISH = 2;
    //判斷是否更新中
    public static String tag = "1";//未點選更新

    /* 下載儲存路徑 */
    private String mSavePath;
    /* 記錄進度條數量 */
    private int progress;
    /* 是否取消更新 */
    private boolean cancelUpdate = false;

    private String ver;//版本號
    private String urlapk;//apk地址
    private String notes;//升級說明
    private Context mContext;
    private int len;
    private NotificationManager manager;
    private Notification notif;
    /* 更新進度條 */
    private ProgressBar mProgress;
    private Dialog mDownloadDialog;
//    RemoteViews contentView;
    private Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
                // 正在下載
                case DOWNLOAD:
                    // 設定進度條位置
                    mProgress.setProgress(progress);
progress, false);
                    notif.contentView.setTextViewText(R.id.content_view_text1, "正在下載...  "+progress+"%");
                    notif.contentView.setProgressBar(R.id.content_view_progress, 100, progress, false);
                    manager.notify(0, notif);
                    break;
                case DOWNLOAD_FINISH:
                    // 安裝檔案
                    notif.contentView.setTextViewText(R.id.content_view_text1, "下載完成！");
                    notif.contentView.setProgressBar(R.id.content_view_progress, 100, 100, false);
                    manager.notify(0, notif);
                    tag = "2";//更新完成開始安裝
                    installApk();
                    break;
                default:
                    break;
            }
        }

        ;
    };

    public UpdateManager(String ver, String url, String notes, Context context) {
        this.mContext = context;
        this.ver = ver;
        this.urlapk = url;
        this.notes = notes;
    }

    public boolean isShowToast = true;

    /**
     * 檢測軟體更新
     */
    public void checkUpdate() {
        if (isUpdate()) {
            // 顯示提示對話方塊
            if(tag.equals("1")){
                showNoticeDialog();
            }else{

            }

        } else {
            if(isShowToast){
                Toast.makeText(mContext, R.string.soft_update_no, Toast.LENGTH_LONG).show();
            }
        }
    }

    /**
     * 檢查軟體是否有更新版本
     *
     * @return
     */
    private boolean isUpdate() {
        // 獲取當前軟體版本
        int versionCode = getVersionCode(mContext);

        int serviceCode = Integer.valueOf(ver);
        // 版本判斷
        if (serviceCode > versionCode) {
            return true;
        }

        return false;
    }

    /**
     * 獲取軟體版本號
     *
     * @param context
     * @return
     */
    private int getVersionCode(Context context) {
        int versionCode = 0;
        try {
            // 獲取軟體版本號，對應AndroidManifest.xml下android:versionCode
            versionCode = context.getPackageManager().getPackageInfo("com.easyhomework", 0).versionCode;
        } catch (NameNotFoundException e) {
            e.printStackTrace();
        }
        return versionCode;
    }

    /**
     * 顯示軟體更新對話方塊
     */
    private void showNoticeDialog() {
        // 構造對話方塊
        Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_update_title);
        builder.setMessage(notes);
        // 更新
        builder.setPositiveButton(R.string.soft_update_updatebtn, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();


//                if (tag) {
                    Toast.makeText(mContext, "後臺更新中,請稍後...", Toast.LENGTH_LONG).show();
                tag="3";//開始更新
//                } else {
//                    // 顯示下載對話方塊
                    showDownloadDialog();
//                    Toast.makeText(mContext, "後臺下載更新中...", Toast.LENGTH_LONG).show();
//                }

            }
        });
        // 稍後更新
        builder.setNegativeButton(R.string.soft_update_later, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        Dialog noticeDialog = builder.create();
        noticeDialog.show();
    }

    /**
     * 顯示軟體下載對話方塊
     */
    private void showDownloadDialog() {

        // 構造軟體下載對話方塊
        Builder builder = new Builder(mContext);
        builder.setTitle(R.string.soft_updating);
        // 給下載對話方塊增加進度條
        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(R.string.soft_update_cancel, new OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                // 設定取消狀態
                cancelUpdate = true;
            }
        });
        mDownloadDialog = builder.create();
//        mDownloadDialog.show();   //不讓下載進度條顯示

            //點選通知欄後開啟的activity
            Intent intent = new Intent(mContext,EasyHomeworkActivity.class);
            PendingIntent pIntent = PendingIntent.getActivity(mContext, 0, intent, 0);
            manager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
            notif = new Notification();
            notif.icon = R.drawable.app_icon;
            notif.tickerText = "更新通知";
            //通知欄顯示所用到的佈局檔案
            notif.contentView = new RemoteViews(mContext.getPackageName(), R.layout.p);
            notif.contentIntent = pIntent;
            manager.notify(0, notif);
        // 下載檔案
        downloadApk();
    }

    /**
     * 下載apk檔案
     */
    private void downloadApk() {
        // 啟動新執行緒下載軟體

        new downloadApkThread().start();
    }
    int downloadCount = 0;
    /**
     * 下載檔案執行緒
     *
     * @author coolszy
     * @date 2012-4-26
     * @blog http://blog.92coding.com
     */
    private class downloadApkThread extends Thread {
        @Override
        public void run() {
            try {

                // 判斷SD卡是否存在，並且是否具有讀寫許可權
                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                    // 獲得儲存卡的路徑
                    String sdpath = Environment.getExternalStorageDirectory() + "/";
                    mSavePath = sdpath + "download";
                    URL url = new URL(urlapk);
                    // 建立連線
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.connect();
                    // 獲取檔案大小
                    int length = conn.getContentLength();
                    // 建立輸入流
                    InputStream is = conn.getInputStream();

                    File file = new File(mSavePath);
                    // 判斷檔案目錄是否存在
                    if (!file.exists()) {
                        file.mkdir();
                    }
                    File apkFile = new File(mSavePath, "easy.apk");
                    FileOutputStream fos = new FileOutputStream(apkFile);
                    int count = 0;
                    // 快取
                    byte buf[] = new byte[1024];
                    // 寫入到檔案中


                    do {
                        int numread = is.read(buf);
                        count += numread;

                        // 計算進度條位置
                        progress = (int) (((float) count / length) * 100);
                        Log.i("progress","progress==="+progress);
                        Log.i("progress","count==="+count+numread);
                        // 更新進度
                        //為了防止頻繁的通知導致應用吃緊，百分比增加10才通知一次
                        if(downloadCount == 0 || progress-5>downloadCount){
                            downloadCount+=5;
                            mHandler.sendEmptyMessage(DOWNLOAD);
                        }
                        if (numread <= 0) {
                            // 下載完成
                            mHandler.sendEmptyMessage(DOWNLOAD_FINISH);
                            break;
                        }
                        // 寫入檔案
                        fos.write(buf, 0, numread);
                    } while (!cancelUpdate);// 點選取消就停止下載.
                    fos.close();
                    is.close();
                }
            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    ;

    /**
     * 安裝APK檔案
     */
    private void installApk() {

        File apkfile = new File(mSavePath, "easy.apk");
        if (!apkfile.exists()) {
            return;
        }
        // 通過Intent安裝APK檔案
;
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");
        mContext.startActivity(intent);

    }
}

還有一個是通知欄的佈局

通知欄佈局 p

<?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:background="#00000000"
    android:orientation="vertical"
    android:padding="7dp"

>
    <ImageView
        android:id="@+id/content_view_image"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:src="@drawable/app_icon"

        />
    <TextView
        android:id="@+id/content_view_text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0%"
        android:textColor="#969191"
        android:layout_toRightOf="@id/content_view_image"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="5dp"
        android:layout_marginLeft="15dp"
        />
    <ProgressBar
        android:id="@+id/content_view_progress"
        android:layout_width="fill_parent"
        android:layout_height="6dp"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:max="100"
        android:layout_below="@id/content_view_image"
        android:layout_marginTop="7dp"
        android:progressDrawable="@drawable/progressbar_color"
        />

</RelativeLayout>

大家仔細看UpdateManager 註釋，很簡單的，最近比較忙，這個部落格有點粗糙，有什麼問題可以加我QQ群大家一起探討一下。