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

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\ 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

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：

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。