下载管理器冻结应用程序并退出如果我销毁应用程序

如何解决下载管理器冻结应用程序并退出如果我销毁应用程序

我正在使用android下载管理器下载图像（大约400到1000张图像），首先要下载外部存储（临时文件夹）中的所有图像，然后将这些文件复制到内部存储文件夹中（因为DownloadManger服务没有写入应用程序专用文件夹的权限）。

案例1：

单击下载按钮后，应用程序冻结，但没有响应，但通知文件开始下载。

案例2：

在下载过程中退出/销毁应用程序时，一段时间后挂起的文件停止下载。

我正在循环使用下载管理器，循环代码如下所示

for (int i=0; i<=imageUrls.length-1; i++){
downloadmngr(imageUrls[i],i);
}

还有带有下载管理器代码的下载图像

public void downloadmngr(String urlimg,int imgname){
    String downloadFileName = urlimg.substring(urlimg.length() - 4);

    list.clear();

        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(urlimg));
        request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
        request.setAllowedOverRoaming(false);
        request.setTitle(imgname + downloadFileName);
        request.setDescription(imgname + downloadFileName);
        request.setVisibleInDownloadsUi(true);request.setDestinationInExternalPublicDir(Environment.getDataDirectory().getPath(),"/"+BuildConfig.S_ampledata+"/"  +novelname+ "/"+ imgname + downloadFileName);
        refid = downloadManager.enqueue(request);
        Log.e("OUTNM","" + refid);
        list.add(refid);
}

还有广泛的广播接收方代码

BroadcastReceiver onComplete = new BroadcastReceiver() {
public void onReceive(Context ctxt,Intent intent) {
long referenceId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID,-1);
Log.e("IN","" + referenceId);
list.remove(referenceId);
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID,0);
            /*Here I am deleting every single file from TEMP folder after file download and copy to PRIVATE folder Completes */
new Thread(new Runnable() {
@Override
public void run() {
runOnUiThread(new Runnable() {

@Override
public void run() {
            /*Here First I Query the downloaded file*/
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterById(referenceId);
Cursor c = downloadManager.query(query);
if (c.moveToFirst()) {
int columnIndex = c
.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c
.getInt(columnIndex)) {
String uriString = c
.getString(c
.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));

Uri a = Uri.parse(uriString);
d = new File(a.getPath());
            /*Here I am Copying the file to private folder*/
try {
int bytesum = 0;
int byteread = 0;
InputStream inStream = new FileInputStream(d);
FileOutputStream fs = new FileOutputStream(MainActivity.this.getFilesDir() + "/"+BuildConfig.S_privatefolder+"/"+novelname+"/"+"a"+d.getName());
byte[] buffer = new byte[1444];
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread;
fs.write(buffer,byteread);
}
inStream.close();
fs.close();
d.delete();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
});
}
}).start();
}

/*In Bellow Code I Emptying / Deleting the Public / Temp folder after all files download complete*/
   
     if (list.isEmpty())
{
Log.e("INSIDE","" + referenceId);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(MainActivity.this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("GadgetSaint")
.setContentText("All Download completed");
Toast.makeText(getBaseContext(),novelname+" Downloading Complete",Toast.LENGTH_SHORT).show();
if (publickdir.exists()){
File[] files2 = publickdir.listFiles();
if(files2.length >0)
{
for(int pd=0; pd<files2.length; pd++) {
if(files2[pd].isFile()) {
files2[pd].delete();
}
}
publickdir.delete();
}else {
publickdir.delete();
}
}
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(455,mBuilder.build());
}
}
};