13

如何使用 Android 下载器下载文件？（WebBrowser 也在使用的下载器）。

我试过这样的事情：

Intent i = new Intent(Intent.ACTION_VIEW , Uri.parse("MyUrl"));
startActivity(i);

有更好的办法吗？

编辑

我使用的是安卓 2.2

4

4 回答 4

19

干得好。

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);
    }
}

不要忘记添加android.permission.internet清单。

于 2012-06-08T14:39:05.380 回答
6

如果您想从 URL 将其下载到用户的 SD 卡上，您只需在手机的默认 Internet 浏览器中打开它即可。

String url = "https://appharbor.com/assets/images/stackoverflow-logo.png";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);

（来自这个问题的代码）

The android browser will then start and the file (in this case an image) will be downloaded.

于 2012-06-16T14:41:14.857 回答
4

您需要HttpUrlConnection在 Android 2.2 及更低版本上使用才能执行此操作。互联网上有一个非常详细的教程，向您展示了如何执行此操作（也带有进度对话框）。

请记住，您必须使用 anAsyncTask或 aThread来确保在实际下载期间不会阻塞 UI 线程！

于 2012-06-13T21:43:44.313 回答
1

Yes, you cant perform network operation in the main thread. You can look up to this repository to download file.

于 2015-05-09T12:24:05.330 回答