Android 如何实施"；下载程序文件“；用什么方法？
我创建了一个代码来下载显示progressbar进度的多个文件。这非常有效，但现在我想将其部署到外部项目（库本身），我遇到了一些问题 我的意图是调用“下载”，当下载完成或返回0或1时。但由于异步，该方法在完成之前返回值。我尝试使用“CountdownLatch”控制它，但没有成功。。。 有什么想法吗 以下代码正常工作，问题是方法“download”返回值而不等待它完成其余代码。 Main.javaAndroid 如何实施"；下载程序文件“；用什么方法？,android,android-asynctask,download,countdownlatch,Android,Android Asynctask,Download,Countdownlatch,我创建了一个代码来下载显示progressbar进度的多个文件。这非常有效，但现在我想将其部署到外部项目（库本身），我遇到了一些问题 我的意图是调用“下载”，当下载完成或返回0或1时。但由于异步，该方法在完成之前返回值。我尝试使用“CountdownLatch”控制它，但没有成功。。。 有什么想法吗 以下代码正常工作，问题是方法“download”返回值而不等待它完成其余代码。 Main.java if(MyLib.download(Main.this, url, nameFiles, "int
if(MyLib.download(Main.this, url, nameFiles, "internal", "folderExtra") == 1){
System.out.println("SUCCESS DOWNLOAD!");
}else{
System.out.println("error download");
}
/** DOWNLOADER WITH PROCESSDIALOG **/
ProgressDialog pDialog;
Context context;
String urlName;
String[] filesToDownload;
int downloadOK = -1;
int currentFile = -1;
int totalFiles = 0;
String typeStorage = "internal";
String folder = "";
CountDownLatch controlLatch;
public int download(Context ctx, String urlName, String[] filesToDownload, String typeStorage, String extraFolder ){
System.out.println("estoy en download");
this.context = ctx;
this.urlName = urlName;
this.filesToDownload = filesToDownload;
this.totalFiles = filesToDownload.length;
this.typeStorage = typeStorage;
/** Almacenamiento de la descarga - Interno o externo **/
if (typeStorage.equalsIgnoreCase("internal")) {
System.out.println("internal");
this.folder = context.getFilesDir().toString() + "/";
} else if (typeStorage.equalsIgnoreCase("external")) {
System.out.println("external");
}
/** COMPLETEMENTO DIRECTORIO/S OPCIONAL **/
if (extraFolder != null && extraFolder != "") {
folder += extraFolder;
}
System.out.println("FOLDER: " + folder);
File directoryFile = new File(folder);
if (!directoryFile.isDirectory()) {
if (!directoryFile.mkdir()) {
Toast.makeText(context, "No se puede crear el directorio o no existe", Toast.LENGTH_LONG).show();
}
}
pDialog = new ProgressDialog(context);
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setTitle("Descargando recursos...");
// controlLatch = new CountDownLatch(1);
startDownload();
/*
try {
System.out.println("STOP");
controlLatch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
*/
return downloadOK;
}
private void startDownload() {
currentFile++;
System.out.println("startDownload!");
if (currentFile < totalFiles) {
pDialog.setMessage("Descargando " + (currentFile + 1) + " de " + totalFiles + "\n\n(..." + filesToDownload[currentFile] + ")");
System.out.println("startDownload currentFile +[" + currentFile + "] totalFiles [" + totalFiles + "]");
System.out.println("file: " + filesToDownload[currentFile].toString());
new DownloaderFile().execute(filesToDownload[currentFile]);
}
}
private class DownloaderFile extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... params) {
try {
File checkFile = new File(folder + params[0]);
if(!checkFile.exists()){
URL urlFinal = new URL(urlName+params[0]);
URLConnection connection = urlFinal.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
InputStream input = new BufferedInputStream(urlFinal.openStream());
OutputStream output = new FileOutputStream(folder + params[0]);
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress((int) (total * 100 / fileLength));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} else {
System.out.println("The file " + filesToDownload[currentFile] + " is downloaded" );
}
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "ok";
}
@Override
protected void onPreExecute() {
super.onPreExecute();
System.out.println("-1");
File checkFile = new File(folder + filesToDownload[currentFile]);
if(!checkFile.exists()){
System.out.println("pDialogShow");
pDialog.show();
}
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
pDialog.setProgress(progress[0]);
}
@Override
protected void onPostExecute(String res) {
System.out.println("10");
if (currentFile == (totalFiles - 1)) {
System.out.println("FINISH!!!!!!!!!!!!!!");
currentFile = 0;
pDialog.dismiss();
downloadOK = 1;
//controlLatch.countDown();
} else {
if (res.equals("ok")) {
startDownload();
} else {
System.out.println("error download");
downloadOK = 0;
}
}
}
}
if(MyLib.download(Main.this, url, nameFiles, "internal", "folderExtra") == 1){
System.out.println("SUCCESS DOWNLOAD!");
}else{
System.out.println("error download");
}
/** DOWNLOADER WITH PROCESSDIALOG **/
ProgressDialog pDialog;
Context context;
String urlName;
String[] filesToDownload;
int downloadOK = -1;
int currentFile = -1;
int totalFiles = 0;
String typeStorage = "internal";
String folder = "";
CountDownLatch controlLatch;
public int download(Context ctx, String urlName, String[] filesToDownload, String typeStorage, String extraFolder ){
System.out.println("estoy en download");
this.context = ctx;
this.urlName = urlName;
this.filesToDownload = filesToDownload;
this.totalFiles = filesToDownload.length;
this.typeStorage = typeStorage;
/** Almacenamiento de la descarga - Interno o externo **/
if (typeStorage.equalsIgnoreCase("internal")) {
System.out.println("internal");
this.folder = context.getFilesDir().toString() + "/";
} else if (typeStorage.equalsIgnoreCase("external")) {
System.out.println("external");
}
/** COMPLETEMENTO DIRECTORIO/S OPCIONAL **/
if (extraFolder != null && extraFolder != "") {
folder += extraFolder;
}
System.out.println("FOLDER: " + folder);
File directoryFile = new File(folder);
if (!directoryFile.isDirectory()) {
if (!directoryFile.mkdir()) {
Toast.makeText(context, "No se puede crear el directorio o no existe", Toast.LENGTH_LONG).show();
}
}
pDialog = new ProgressDialog(context);
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.setMax(100);
pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pDialog.setTitle("Descargando recursos...");
// controlLatch = new CountDownLatch(1);
startDownload();
/*
try {
System.out.println("STOP");
controlLatch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
*/
return downloadOK;
}
private void startDownload() {
currentFile++;
System.out.println("startDownload!");
if (currentFile < totalFiles) {
pDialog.setMessage("Descargando " + (currentFile + 1) + " de " + totalFiles + "\n\n(..." + filesToDownload[currentFile] + ")");
System.out.println("startDownload currentFile +[" + currentFile + "] totalFiles [" + totalFiles + "]");
System.out.println("file: " + filesToDownload[currentFile].toString());
new DownloaderFile().execute(filesToDownload[currentFile]);
}
}
private class DownloaderFile extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... params) {
try {
File checkFile = new File(folder + params[0]);
if(!checkFile.exists()){
URL urlFinal = new URL(urlName+params[0]);
URLConnection connection = urlFinal.openConnection();
connection.connect();
int fileLength = connection.getContentLength();
InputStream input = new BufferedInputStream(urlFinal.openStream());
OutputStream output = new FileOutputStream(folder + params[0]);
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress((int) (total * 100 / fileLength));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} else {
System.out.println("The file " + filesToDownload[currentFile] + " is downloaded" );
}
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "ok";
}
@Override
protected void onPreExecute() {
super.onPreExecute();
System.out.println("-1");
File checkFile = new File(folder + filesToDownload[currentFile]);
if(!checkFile.exists()){
System.out.println("pDialogShow");
pDialog.show();
}
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
pDialog.setProgress(progress[0]);
}
@Override
protected void onPostExecute(String res) {
System.out.println("10");
if (currentFile == (totalFiles - 1)) {
System.out.println("FINISH!!!!!!!!!!!!!!");
currentFile = 0;
pDialog.dismiss();
downloadOK = 1;
//controlLatch.countDown();
} else {
if (res.equals("ok")) {
startDownload();
} else {
System.out.println("error download");
downloadOK = 0;
}
}
}
}
/**带PROCESSDIALOG的下载程序**/
ProgressDialog；
语境；
字符串名称；
字符串[]filesToDownload；
int downloadOK=-1；
int currentFile=-1；
int totalFiles=0；
字符串typeStorage=“internal”；
字符串文件夹=”；
倒计时锁存控制；
公共int下载（上下文ctx、字符串urlName、字符串[]文件下载、字符串类型存储、字符串外部文件夹）{
System.out.println（“estoy en下载”）；
this.context=ctx；
this.urlName=urlName；
this.filesToDownload=filesToDownload；
this.totalFiles=filesToDownload.length；
this.typeStorage=typeStorage；
/**阿拉木图-内部和外部**/
if（typeStorage.equalsIgnoreCase（“内部”））{
系统输出打印项次（“内部”）；
this.folder=context.getFilesDir（）.toString（）+“/”；
}else if（typeStorage.equalsIgnoreCase（“外部”））{
系统输出打印项次（“外部”）；
}
/**完成董事职务**/
如果（extraFolder！=null&&extraFolder！=“”）{
文件夹+=外部文件夹；
}
System.out.println（“文件夹：+文件夹”）；
文件目录File=新文件（文件夹）；
如果（！directoryFile.isDirectory（））{
如果（！directoryFile.mkdir（））{
Toast.makeText（上下文，“不存在”，Toast.LENGTH_LONG.show（）；
}
}
pDialog=新建进度对话框（上下文）；
pDialog.setUndeterminate（假）；
pDialog.setCancelable（假）；
pDialog.setMax（100）；
pDialog.setProgressStyle（ProgressDialog.STYLE_水平）；
pDialog.setTitle（“描述递归…”）；
//controlLatch=新的倒计时锁存器（1）；
startDownload（）；
/*
试一试{
系统输出打印项次（“停止”）；
controlLatch.await（）；
}捕捉（中断异常e）{
e、 printStackTrace（）；
}
*/
返回下载OK；
}
私有void startDownload（）{
currentFile++；
System.out.println（“startDownload！”）；
如果（currentFileDownloaderFilepublic interface OnDownloadCompleteListener {
public void onDownloadComplete(boolean success);
}