我正在使用.net网络服务,我可以在SD卡中下载文件,但我想在特定文件开始下载和完成时显示进度条,然后我想显示视图和取消等选项.
点击事件类：
public void onItemClick(AdapterView<?> parent,View v,int position,long id)
{
LazyAdapter ca = (LazyAdapter)parent.getAdapter();
FolderList item_name = (FolderList)ca.getItem(position);
FolderList DocumentID = (FolderList)ca.getItem(position);
FolderList type = (FolderList)ca.getItem(position);
Intent mIntent = new Intent();
mIntent.putExtra("item_name",item_name.folder_name);
mIntent.putExtra("item_id",DocumentID.ID);
mIntent.putExtra("item_type",type.type);
mIntent.getStringExtra("item_name");
String Type = mIntent.getStringExtra("item_type");
Log.i("Type",Type);
if {
// Some code here...
} else {
Intent i = new Intent(getApplicationContext(),Display_image.class);
i.putExtra("item_name",item_name.folder_name);
i.putExtra("ID",DocumentID.ID);
i.putExtra("item_type",type.type);
i.putExtra("User_ID",User_ID);
i.getStringExtra("item_name");
Id = i.getStringExtra("ID");
i.getStringExtra("item_type");
startActivity(i);
}
}
我的代码：我想使用下载管理器
SoapPrimitive DocumentResponse = (SoapPrimitive)Envelope.getResponse();
Log.i("DocumentResponse",DocumentResponse.toString());
String DocAsString = DocumentResponse.toString();
byte[] decodedString = Base64.decode(DocAsString,Base64.DEFAULT);
File direct = new File(Environment.getExternalStorageDirectory() + "/MyFolder");
if(!direct.exists())
{
direct.mkdir();
}
File photo = new File(Environment.getExternalStorageDirectory() + "/MyFolder",Name);
if (photo.exists())
{
photo.delete();
}
try {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(Name));
request.setDescription("Have Fun ;)");
request.setTitle("Downloading...");
// in order for this if to run,you must use the android 3.2 to compile your app
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
}
FileOutputStream fos=new FileOutputStream(photo.getPath());
fos.write(decodedString);
fos.close();
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
ContentValues values= new ContentValues();
System.out.println(values);
}
catch (java.io.IOException e)
{
Log.e("PictureDemo","Exception in photoCallback",e);
}
}
请建议如何使用下载管理器？谢谢
解决方法
您可以使用ProgressBar来完成此任务.
首先,在您的界面中添加一个进度条,如下所示：
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@android:style/Widget.ProgressBar.Small"/>
protected ProgressBar mProgressBar;
protected long downloadId;
protected DownloadManager manager;
public void startdownload() {
//<SET UP DOWNLOAD MANAGER HERE>
downloadId = manager.enqueue(request);
mProgressBar = findViewById(R.id.progress_bar);
Timer myTimer = new Timer();
myTimer.schedule(new TimerTask() {
@Override
public void run() {
DownloadManager.Query q = new DownloadManager.Query();
q.setFilterById(downloadId);
Cursor cursor = manager.query(q);
cursor.moveToFirst();
int bytes_downloaded = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
int bytes_total = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
cursor.close();
int dl_progress = (bytesDownloaded * 1f / bytesTotal) * 100;
runOnUiThread(new Runnable(){
@Override
public void run(){
mProgressbar.setProgress((int) dl_progress);
}
});
}
},10);
}
