先放个gif。。最终效果如果：

主要演示了Android从服务器下载文件，调用Notification显示下载进度，并且在下载完毕以后点击通知会跳转到安装APK的界面，演示是在真实的网络环境中使用真实的URL进行演示，来看看代码：

MainActivity代码非常简单，就是启动一个Service：

public class MainActivity extends AppCompatActivity { String download_url="http://shouji.360tpcdn.com/160329/a9037075b8d3aa98fbf6115c54a5b895/com.alensw.PicFolder_4722404.apk"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void bt_start_service(View view){ Intent intent=new Intent(this,DownLoadService.class); intent.putExtra("download_url",download_url); startService(intent); }}

DownLoadService里面，在onStartCommand方法里面是关键代码，调用NotifyUtil这个工具类的“notify_progress”方法去显示一个通知，与此同时开始下载APK文件，DownLoadService代码如下：

public class DownLoadService extends Service { String download_url; String savePath= Environment.getExternalStorageDirectory()+"/liulan.apk"; private int requestCode = (int) SystemClock.uptimeMillis(); private NotifyUtil currentNotify; File mFile; @Nullable @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { super.onCreate(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { mFile=new File(savePath); download_url=intent.getStringExtra("download_url"); Log.e("test","执行onStartCommand"); //设置想要展示的数据内容 Intent intent_noti = new Intent(); intent_noti.setAction(Intent.ACTION_VIEW); //文件的类型，从tomcat里面找 intent_noti.setDataAndType(Uri.fromFile(mFile), "application/vnd.android.package-archive"); PendingIntent rightPendIntent = PendingIntent.getActivity(this, requestCode, intent_noti, PendingIntent.FLAG_UPDATE_CURRENT); int smallIcon = R.drawable.xc_smaillicon; String ticker = "正在更新快图浏览"; //实例化工具类，并且调用接口 NotifyUtil notify7 = new NotifyUtil(this, 7); notify7.notify_progress(rightPendIntent, smallIcon, ticker, "快图浏览升级程序", "正在下载中", false, false, false, download_url, savePath, new NotifyUtil.DownLoadListener() { @Override public void OnSuccess(File file) { mFile=file; DownLoadService.this.stopSelf(); } @Override public void onFailure(Throwable t, int errorNo, String strMsg) { } }); currentNotify = notify7; return super.onStartCommand(intent, flags, startId); }}

在调用“notify_progress”方法的时候，已经开始下载文件了，那么下载的代码是什么呢？如下：

public void notify_progress(PendingIntent pendingIntent, int smallIcon, String ticker, String title, String content, boolean sound, boolean vibrate, boolean lights, String download_url, String savePath, final DownLoadListener listener) { setCompatBuilder(pendingIntent, smallIcon, ticker, title, content, sound, vibrate, lights); /* * 因为进度条要实时更新通知栏也就说要不断的发送新的提示，所以这里不建议开启通知声音。 * 这里是作为范例，给大家讲解下原理。所以发送通知后会听到多次的通知声音。 */ FinalHttp fh = new FinalHttp(); HttpHandler<File> httpHandler=fh.download(download_url, savePath, new AjaxCallBack<File>() { @Override public void onLoading(long count, long current) { super.onLoading(count, current); double a=count; double b=current; double currentPro=(double)((b/a)*100); cBuilder.setProgress(100, (int)currentPro, false); sent(); } @Override public void onSuccess(File file) { super.onSuccess(file); cBuilder.setContentText("下载完成").setProgress(0, 0, false); sent(); listener.OnSuccess(file); } @Override public void onFailure(Throwable t, int errorNo, String strMsg) { super.onFailure(t, errorNo, strMsg); listener.onFailure(t,errorNo,strMsg); } }); }

这里用到了afinal.jar

这个jar已经封装好下载的工具类，我们直接拿来用就行。下载成功之后会通过DownLoadListener这个接口回调到DownLoadService里面，最终运行效果就如最上面那个gif动态图运行效果一样。

项目下载地址：点击下载

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