Java 当用户在android中单击时如何取消下载

我刚开始下载android的manager端，我不能在用户点击按钮时取消下载，我正在输入请求的当前id，但仍然没有解决它，请提前帮我解决 这是主要课程

 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();

}

---

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();

}

---

真是太好了。。你让我很开心。。解决方案非常简单，我没有得到它b4，但它再次…像一个charmdownloadReference=dm.enqueue（请求）创建一个新任务一样工作。