当用户在android中点击时，如何取消下载

Question

我是android下载管理器端的新手，当用户点击按钮时，我无法取消下载，我正在放置请求的当前id，但仍未解决，请提前帮助我这是主要的

 public class DownloadManagerActivity extends Activity {
    private long enqueue; private DownloadManager dm; private long     downloadReference; Query query; Cursor c; String action;
long downloadId;
Request request;
@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) {
            action = intent.getAction();
            if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
                downloadId = intent.getLongExtra(
                        DownloadManager.EXTRA_DOWNLOAD_ID, 0);
                query = new Query();
                query.setFilterById(enqueue);
                c = dm.query(query);
                if (c.moveToFirst()) {
                    int columnIndex = c
                            .getColumnIndex(DownloadManager.COLUMN_STATUS);
                    //
                    if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
                        Toast.makeText(DownloadManagerActivity.this, "Download Complete", Toast.LENGTH_LONG).show();
                    }

                }
            }
        }
    };
    registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
public void onClick(View view) {
    dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
    request = new Request(Uri.parse("http://192.168.10.6/mytv/mashup.mp4"));
    enqueue = dm.enqueue(request);
}
public void showDownload(View view) {
    Intent i = new Intent();
    i.setAction(DownloadManager.ACTION_VIEW_DOWNLOADS);
    startActivity(i);
}
public void cancelDownload(View view) {
    //downloadReference= intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
    downloadReference = dm.enqueue(request);
    dm.remove(downloadReference);
    Toast.makeText(DownloadManagerActivity.this, "Download Cancelled", Toast.LENGTH_SHORT).show();
}

Answer 1

downloadReference = dm.enqueue(request)创建一个新任务并返回一个新id。您应该使用以前的id。

public void cancelDownload(View view) {
    //downloadReference= intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
    //downloadReference = dm.enqueue(request);
    dm.remove(enqueue );
    Toast.makeText(DownloadManagerActivity.this, "Download Cancelled", Toast.LENGTH_SHORT).show();
}