我试图写一个简单的应用程序得到更新。为此,我需要一个简单的函数,可以下载文件并在ProgressDialog中显示当前进度。我知道如何做的ProgressDialog,但我不确定如何显示当前的进度,以及如何下载文件放在第一位。
当前回答
我正在为我现在使用的其他解决方案添加另一个答案,因为Android查询太大了,无法保持健康。所以我搬到了这个https://github.com/amitshekhariitbhu/Fast-Android-Networking。
AndroidNetworking.download(url,dirPath,fileName).build()
.setDownloadProgressListener(new DownloadProgressListener() {
public void onProgress(long bytesDownloaded, long totalBytes) {
bar.setMax((int) totalBytes);
bar.setProgress((int) bytesDownloaded);
}
}).startDownload(new DownloadListener() {
public void onDownloadComplete() {
...
}
public void onError(ANError error) {
...
}
});
其他回答
不要忘记用新文件("/mnt/sdcard/…")替换"/sdcard…",否则你会得到一个FileNotFoundException
我遇到了一个简单文件下载库 获取,重要的是,它有存储访问框架,内容提供程序和URI支持。如果有人还在寻找,可能会有帮助。
//AndroidX .tonyodev.fetch2:xfetch2:3.1.6
实现"com.tonyodev.fetch2:fetch2:3.0.12" //支持lib
需要的权限,如果你不是使用应用程序特定的目录。
< uses-permission android: name = " android.permission.WRITE_EXTERNAL_STORAGE " / >
< uses-permission android: name = " android.permission.READ_EXTERNAL_STORAGE " / >
网络权限
< uses-permission android: name = " android.permission.INTERNET " / >
private Fetch fetch;
FetchConfiguration fetchConfiguration = new FetchConfiguration.Builder(this)
.setDownloadConcurrentLimit(3)//Concurrent Download limit
.build();
fetch = Fetch.Impl.getInstance(fetchConfiguration);
String url = "http:www.example.com/test.txt";//URL of file
String file = "/downloads/test.txt";//Path of file
final Request request = new Request(url, file);
request.setPriority(Priority.HIGH);
request.setNetworkType(NetworkType.ALL);//Preferred network type
request.addHeader("clientKey", "SD78DF93_3947&MVNGHE1WONG");//Auth header if any
fetch.enqueue(request, updatedRequest -> {
//Request was successfully enqueued for download.
}, error -> {
//An error occurred enqueuing the request.
});
}
倾听更新和进展
FetchListener fetchListener = new FetchListener() {
@Override
public void onQueued(@NotNull Download download, boolean waitingOnNetwork) {
if (request.getId() == download.getId()) {
showDownloadInList(download);
}
}
@Override
public void onCompleted(@NotNull Download download) {
}
@Override
public void onError(@NotNull Download download) {
Error error = download.getError();
}
@Override
public void onProgress(@NotNull Download download, long etaInMilliSeconds, long downloadedBytesPerSecond) {
if (request.getId() == download.getId()) {
updateDownload(download, etaInMilliSeconds);
}
int progress = download.getProgress();
}
@Override
public void onPaused(@NotNull Download download) {
}
@Override
public void onResumed(@NotNull Download download) {
}
@Override
public void onCancelled(@NotNull Download download) {
}
@Override
public void onRemoved(@NotNull Download download) {
}
@Override
public void onDeleted(@NotNull Download download) {
}
};
fetch.addListener(fetchListener);
//Remove listener when done.
fetch.removeListener(fetchListener);
此示例代码取自所有者页面,所有功劳都归于Tonyo Francis
使用Android查询库,确实很酷。你可以改变它使用ProgressDialog,就像你在其他例子中看到的那样,这个将从你的布局中显示进度视图,并在完成后隐藏它。
File target = new File(new File(Environment.getExternalStorageDirectory(), "ApplicationName"), "tmp.pdf");
new AQuery(this).progress(R.id.progress_view).download(_competition.qualificationScoreCardsPdf(), target, new AjaxCallback<File>() {
public void callback(String url, File file, AjaxStatus status) {
if (file != null) {
// do something with file
}
}
});
您可以使用LiveData和协程观察下载管理器的进度,参见下面的要点
https://gist.github.com/FhdAlotaibi/678eb1f4fa94475daf74ac491874fc0e
data class DownloadItem(val bytesDownloadedSoFar: Long = -1, val totalSizeBytes: Long = -1, val status: Int)
class DownloadProgressLiveData(private val application: Application, private val requestId: Long) : LiveData<DownloadItem>(), CoroutineScope {
private val downloadManager by lazy {
application.getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
}
private val job = Job()
override val coroutineContext: CoroutineContext
get() = Dispatchers.IO + job
override fun onActive() {
super.onActive()
launch {
while (isActive) {
val query = DownloadManager.Query().setFilterById(requestId)
val cursor = downloadManager.query(query)
if (cursor.moveToFirst()) {
val status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS))
Timber.d("Status $status")
when (status) {
DownloadManager.STATUS_SUCCESSFUL,
DownloadManager.STATUS_PENDING,
DownloadManager.STATUS_FAILED,
DownloadManager.STATUS_PAUSED -> postValue(DownloadItem(status = status))
else -> {
val bytesDownloadedSoFar = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR))
val totalSizeBytes = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES))
postValue(DownloadItem(bytesDownloadedSoFar.toLong(), totalSizeBytes.toLong(), status))
}
}
if (status == DownloadManager.STATUS_SUCCESSFUL || status == DownloadManager.STATUS_FAILED)
cancel()
} else {
postValue(DownloadItem(status = DownloadManager.STATUS_FAILED))
cancel()
}
cursor.close()
delay(300)
}
}
}
override fun onInactive() {
super.onInactive()
job.cancel()
}
}
我正在为我现在使用的其他解决方案添加另一个答案,因为Android查询太大了,无法保持健康。所以我搬到了这个https://github.com/amitshekhariitbhu/Fast-Android-Networking。
AndroidNetworking.download(url,dirPath,fileName).build()
.setDownloadProgressListener(new DownloadProgressListener() {
public void onProgress(long bytesDownloaded, long totalBytes) {
bar.setMax((int) totalBytes);
bar.setProgress((int) bytesDownloaded);
}
}).startDownload(new DownloadListener() {
public void onDownloadComplete() {
...
}
public void onError(ANError error) {
...
}
});
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