Android实现Service下载文件，Notification显示下载进度的示例

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 httpHandler=fh.download(download_url, savePath, new AjaxCallBack() {   @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

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脚本之家。

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