This article shares the specific code for Android simple file download for your reference. The specific content is as follows
Permissions
<!-- File read and write permissions --> <uses-permission android:name=".READ_EXTERNAL_STORAGE" /> <!-- Access memory --> <uses-permission android:name=".WRITE_EXTERNAL_STORAGE" />
DownloadOkHttp Use (no display)
Download completion address: /storage/emulated/0/Xiaohongshu/
().download(apk, () + "/" + "Little Red Book", new () {
@Override
public void onDownloadSuccess() {
("download","success");
}
@Override
public void onDownloading(int progress) {
("download", (progress));
}
@Override
public void onDownloadFailed() {
("download","fail");
}
});
Download Use (displayed)
Download completed address: /Xiaohongshu/Xiaohongshu.apk
new (this, apk, "Little Red Book.apk", "Little Red Book");
dialog_progress
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="@dimen/dp_20"
android:orientation="vertical">
<ProgressBar
android:
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:
android:layout_width="match_parent"
android:layout_marginTop="10dp"
android:gravity="right"
android:text="0 %"
android:layout_height="wrap_content"/>
</LinearLayout>
**Tool class DownloadUtil (two implementation methods, understand by yourself!!!)
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/**
* Created by: Simon
* Created on: 2021/6/7 13:58
* Description: File download
*/
public class DownloadUtil {
public static class DownloadOkHttp {
private static DownloadOkHttp downloadUtil;
private final OkHttpClient okHttpClient;
public static DownloadOkHttp get() {
if (downloadUtil == null) {
downloadUtil = new DownloadOkHttp();
}
return downloadUtil;
}
private DownloadOkHttp() {
okHttpClient = new OkHttpClient();
}
/**
*
* @param url Download connection
* @param saveDir SDCard directory that stores downloaded files
* @param listener Download and listen
*/
public void download( String url, final String saveDir, final OnDownloadListener listener) {
Request request = new ().url(url).build();
(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
// Download failed ();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
InputStream is = null;
byte[] buf = new byte[2048];
int len = 0;
FileOutputStream fos = null;
// directory to store downloaded files String savePath = isExistDir(saveDir);
try {
is = ().byteStream();
long total = ().contentLength();
File file = new File(savePath, getNameFromUrl(url));
fos = new FileOutputStream(file);
long sum = 0;
while ((len = (buf)) != -1) {
(buf, 0, len);
sum += len;
int progress = (int) (sum * 1.0f / total * 100);
// Downloading (progress);
}
();
// Download completed ();
} catch (Exception e) {
();
} finally {
try {
if (is != null)
();
} catch (IOException e) {
}
try {
if (fos != null)
();
} catch (IOException e) {
}
}
}
});
}
/**
* Determine whether the download directory exists
* @param saveDir
* @return
* @throws IOException
*/
private String isExistDir(String saveDir) throws IOException {
// Download location File downloadFile = new File((), saveDir);
if (!()) {
();
}
String savePath = ();
return savePath;
}
/**
* url
* Parses file name from download connection
*/
@NonNull
public static String getNameFromUrl(String url) {
return (("/") + 1);
}
public interface OnDownloadListener {
/**
* Download successfully
*/
void onDownloadSuccess();
/**
* @param progress
* Download progress
*/
void onDownloading(int progress);
/**
* Download failed
*/
void onDownloadFailed();
}
}
public static class Download {
private String fileSavePath = "";//Local path to save the file private String fileDownLoad_path = "";//Download URL private String mfileName = "";//Downloaded file name private boolean mIsCancel = false;
private int mProgress;
private ProgressBar mProgressBar;
private TextView text;
private Dialog mDownloadDialog;
private final Context context;
private static final int DOWNLOADING = 1;
private static final int DOWNLOAD_FINISH = 2;
private Handler mUpdateProgressHandler = new Handler() {
public void handleMessage(Message msg) {
switch () {
case DOWNLOADING:
// Set the progress bar (mProgress);
((mProgress));
break;
case DOWNLOAD_FINISH:
// Hide the current download dialog box ();
}
}
};
/**
* Download initialization
* @param context context
* @param fileDownLoad_path The URL to download
* @param mfileName Downloaded file name
* @param fileSavePath Local path to save the file
*/
public Download(Context context, String fileDownLoad_path, String mfileName, String fileSavePath) {
= context;
this.fileDownLoad_path = fileDownLoad_path;
= mfileName;
= () + "/" + fileSavePath;
showDownloadDialog();
}
/**
* Show the downloaded dialog box
*/
protected void showDownloadDialog() {
builder = new (context);
("Download");
View view = (context).inflate(.dialog_progress, null);
mProgressBar = (ProgressBar) (.id_progress);
text = (.id_text);
(view);
("Cancel", new () {
@Override
public void onClick(DialogInterface dialog, int which) {
// Hide the current dialog box ();
// Set the download status to Cancel mIsCancel = true;
}
});
mDownloadDialog = ();
();
// Download the file downloadFile();
}
/**
* Download the file
*/
private void downloadFile() {
new Thread(new Runnable() {
@Override
public void run() {
try {
if (().equals(Environment.MEDIA_MOUNTED)) {
File dir = new File(fileSavePath);
if (!()){
();
}
// Download the file HttpURLConnection conn = (HttpURLConnection) new URL(fileDownLoad_path).openConnection();
();
InputStream is = ();
int length = ();
File apkFile = new File(fileSavePath, mfileName);
FileOutputStream fos = new FileOutputStream(apkFile);
int count = 0;
byte[] buffer = new byte[1024];
while (!mIsCancel) {
int numread = (buffer);
count += numread;
// Calculate the current position of the progress bar mProgress = (int) (((float) count / length) * 100);
// Update progress bar (DOWNLOADING);
// Download completed if (numread < 0) {
(DOWNLOAD_FINISH);
break;
}
(buffer, 0, numread);
}
();
();
}
} catch (Exception e) {
();
}
}
}).start();
}
}
}
The above is all the content of this article. I hope it will be helpful to everyone's study and I hope everyone will support me more.