如何在Android中访问下载文件夹？

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如何在Android中访问下载文件夹？

我是一个新的安卓开发者，我正在制作一个应用程序，可以将文件下载到下载文件夹中（使用Download Manager）。如果我在模拟器中打开下载文件夹，我可以看到图片。所以，如果我想显示已下载文件的幻灯片，如何访问该文件夹？另外，如何在这段代码中添加进度条？

我想添加一个按钮，可以从下载文件夹中获取图片，并以幻灯片的形式显示出来。

以下是相应的代码：

import java.util.Arrays;
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 Download_managerActivity extends Activity {
    private long quueue_for_url;
    private DownloadManager dm;
    @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(quueue_for_url);
                    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 uri_String_abcd = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
                            view.setImageURI(Uri.parse(uri_String_abcd));
                        }
                    }
                }
            }
        };
        registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
    }
    public void onClick(View view) {
        dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        Request request_for_url = new Request(Uri.parse("http://fc03.deviantart.net/fs14/i/2007/086/9/1/Steve_Jobs_portrait_by_tumb.jpg"));
        Request request_for_url1 = new Request(Uri.parse("http://2.bp.blogspot.com/_q7Rxg4wqDyc/S5ZRVLxVYuI/AAAAAAAAAvU/fQAUZ2XFcp8/s400/katrina-kaif.jpg"));
        Request request_for_url2 = new Request(Uri.parse("http://www.buzzreactor.com/sites/default/files/Bill-Gates1.jpg"));
        quueue_for_url = dm.enqueue(request_for_url);
        quueue_for_url = dm.enqueue(request_for_url1);
        quueue_for_url = dm.enqueue(request_for_url2);
    }
    public void showDownload(View view) {
        Intent i = new Intent();
        i.setAction(DownloadManager.ACTION_VIEW_DOWNLOADS);
        startActivity(i);
    }
}

请注意，这只是一个精炼版本的翻译，一些细节可能会丢失。如果需要更详细的翻译，请提供更多信息。

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