问题
How can I download files using Android downloader? (The downloader that WebBrowser is using that too).
I tried something like this :
Intent i = new Intent(Intent.ACTION_VIEW , Uri.parse("MyUrl"));
startActivity(i);
Any better way?
Edit
I am using Android 2.2
回答1:
You need to use HttpUrlConnection
to do this on Android 2.2 and below. There is a very detailed tutorial on the internet that shows you how to do this (with a progress dialog box too).
Remember you must use an AsyncTask
or a Thread
to ensure that you do not block the UI thread during the actual download!
回答2:
Here you go.
import android.app.Activity;
import android.app.DownloadManager;
import android.app.DownloadManager.Query;
import android.app.DownloadManager.Request;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
public class DownloadManagerActivity extends Activity {
private long enqueue;
private DownloadManager dm;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(
DownloadManager.EXTRA_DOWNLOAD_ID, 0);
Query query = new Query();
query.setFilterById(enqueue);
Cursor c = dm.query(query);
if (c.moveToFirst()) {
int columnIndex = c
.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c
.getInt(columnIndex)) {
ImageView view = (ImageView) findViewById(R.id.imageView1);
String uriString = c
.getString(c
.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
view.setImageURI(Uri.parse(uriString));
}
}
}
}
};
registerReceiver(receiver, new IntentFilter(
DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
public void onClick(View view) {
dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
Request request = new Request(
Uri.parse("url for file to download"));
enqueue = dm.enqueue(request);
}
public void showDownload(View view) {
Intent i = new Intent();
i.setAction(DownloadManager.ACTION_VIEW_DOWNLOADS);
startActivity(i);
}
}
Don't forget to add android.permission.internet
in manifest.
回答3:
If you want to download it onto the user's SD card from an URL, you can just open it in the phone's default internet browser.
String url = "https://appharbor.com/assets/images/stackoverflow-logo.png";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
(Code from this question)
The android browser will then start and the file (in this case an image) will be downloaded.
回答4:
Yes, you cant perform network operation in the main thread. You can look up to this repository to download file.
来源:https://stackoverflow.com/questions/10950529/how-do-i-download-a-file-via-default-android-downloader