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

2017-01-10 16:11 921 查看

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

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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