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Android實(shí)現(xiàn)Service下載文件，Notification顯示下載進(jìn)度的示例

更新時(shí)間：2017年01月10日 16:11:14 作者：孤心泣

本篇文章主要介紹了Android實(shí)現(xiàn)Service下載文件，Notification顯示下載進(jìn)度，具有一定的參考價(jià)值，有興趣的可以了解一下。

先放個(gè)gif。。最終效果如果：

主要演示了Android從服務(wù)器下載文件，調(diào)用Notification顯示下載進(jìn)度，并且在下載完畢以后點(diǎn)擊通知會(huì)跳轉(zhuǎn)到安裝APK的界面，演示是在真實(shí)的網(wǎng)絡(luò)環(huán)境中使用真實(shí)的URL進(jìn)行演示，來(lái)看看代碼：

MainActivity代碼非常簡(jiǎn)單，就是啟動(dòng)一個(gè)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方法里面是關(guān)鍵代碼，調(diào)用NotifyUtil這個(gè)工具類的“notify_progress”方法去顯示一個(gè)通知，與此同時(shí)開(kāi)始下載APK文件，DownLoadService代碼如下：

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","執(zhí)行onStartCommand");
  //設(shè)置想要展示的數(shù)據(jù)內(nèi)容
  Intent intent_noti = new Intent();
  intent_noti.setAction(Intent.ACTION_VIEW);
  //文件的類型，從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 = "正在更新快圖瀏覽";
  //實(shí)例化工具類，并且調(diào)用接口
  NotifyUtil notify7 = new NotifyUtil(this, 7);
  notify7.notify_progress(rightPendIntent, smallIcon, ticker, "快圖瀏覽升級(jí)程序", "正在下載中",
    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);

 }
}

在調(diào)用“notify_progress”方法的時(shí)候，已經(jīng)開(kāi)始下載文件了，那么下載的代碼是什么呢？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?yàn)檫M(jìn)度條要實(shí)時(shí)更新通知欄也就說(shuō)要不斷的發(fā)送新的提示，所以這里不建議開(kāi)啟通知聲音。
   * 這里是作為范例，給大家講解下原理。所以發(fā)送通知后會(huì)聽(tīng)到多次的通知聲音。
   */
  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("下載完成").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);
   }

  });


 }

這里用到了afinal.jar

這個(gè)jar已經(jīng)封裝好下載的工具類，我們直接拿來(lái)用就行。下載成功之后會(huì)通過(guò)DownLoadListener這個(gè)接口回調(diào)到DownLoadService里面，最終運(yùn)行效果就如最上面那個(gè)gif動(dòng)態(tài)圖運(yùn)行效果一樣。

項(xiàng)目下載地址：點(diǎn)擊下載

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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