Question

我正在开发一个应用程序，主要侧重于从Web服务下载文件并将其存储在SD卡中。一切都很简单，直到我的客户需要取消下载。我尝试了很多方法，但我失败了。因此，任何人都可以帮助我，并发布一些片段取消下载。意图服务将是首选。

编辑：

                    Toast.makeText(ThumbnailView.this, R.string.Download_start, Toast.LENGTH_SHORT).show();
                    pb.setVisibility(View.VISIBLE);
                    info_icon.setVisibility(View.INVISIBLE);
                    langBtn.setVisibility(View.INVISIBLE);
                    name.setVisibility(View.INVISIBLE );
                    author.setVisibility(View.INVISIBLE );
                    lastReading.setVisibility(View.INVISIBLE);
                    intent = new Intent(ThumbnailView.this,
                        DownloadAndExtractFiles.class);
                    Common.isDownloadProgress = true;
                intent.putExtra("BEAN", bean);
                intent.putExtra("FROM", "library");
                intent.putExtra("receiverTag", mReceiver);
                startService(intent);

IntentService类：

            try {

                File file = new File(path, /* BOOK_ID */filename + fileformat);
                if (file.exists())
                    file.delete();
                file.createNewFile();
                output = new FileOutputStream(file);

                finalpath = path + "/" + filename + fileformat;

                Log.d("book UNEXTR path", finalpath);
                byte data[] = new byte[1024];
                long total = 0;


                while ((count = input.read(data)) != -1) {
                    if (Common.downloadChkLogout) {
                        // Changed on saturday 9th nov
                        //if (Common.isDownloadProgress) {
                            if (stopped) {
                                break;
                            }
                            total += count;
                            Bundle resultData = new Bundle();
                            resultData.putInt("progress",
                                    (int) (total * 100 / lenghtOfFile));
                            bean.setProgress((int) (total * 100 / lenghtOfFile));
                            rec.send(UPDATE_PROGRESS, resultData);
                            output.write(data, 0, count);
                        }
                    }
                success = true;
                //}
                output.flush();
                output.close();
                input.close();
            } catch (Exception ex) {
                ex.printStackTrace();
                mError = "Download Failed";
                System.out.println("Net Disconnect;:" + mError);

                Toast.makeText(getApplicationContext(), mError,
                        Toast.LENGTH_LONG).show();
            }

编辑：

public void onClick(DialogInterface dialog,int id) {
 Log.i("Aftr before service stopped---->>>>>", "true"); 
 Log.i("Intent obj","Intent check..."+intent);
 if(intent!=null)
{ 
 Common.isDownloadProgress = false;
 stopService(intent);

这是我的取消点击

我已经发布了启动服务的代码，并在onHandleIntent上下载了部分代码在此先感谢：）

Answer 1

我应该使用AsyncTask下载项目，它也会在取消事件中提供。

假设您正在使用HttpGet下载文件，您的任务将看起来像......

public class FileDownloadingTask extends AsyncTask<Void, Void, Void> {
    private String url = null;
    private String destPath = null;
    private HttpGet httpGet = null;
    // Constructor
    public FileDownloadingTask(String url, String destPath) {
        this.url = url;
        this.destPath = destPath;
    }

    // Create a progress dialog in your onPreExecute

    // Start downloading in your doInBackground and save to destPath in sd-card

    // Proform any thing your want in response to download process in onPostCreate

    // Finally...
    @Override
    protected void onCancelled() {
        super.onCancelled();
        // Aborting http request
        if (httpget != null) {
            httpget.abort();
        }
    }

    // Then in your cancel button of progress dialog call this.onCancel();
}

希望这会给你一些提示...... :)

Answer 2

您需要检查服务中是否已停止，并且您已完成该行的一半

if (stopped)
    break;

现在使stopped成为一个静态布尔值，并在按钮点击时将其设置为true，

修改您已经检查了Common.isDowloadProgress，但已对其进行了评论，我认为您需要按照以下方式打破循环

while ((count = input.read(data)) != -1) { if (Common.downloadChkLogout) { if (Common.isDownloadProgress) { if (stopped) { break; } total += count; Bundle resultData = new Bundle(); resultData.putInt("progress", (int) (total * 100 / lenghtOfFile)); bean.setProgress((int) (total * 100 / lenghtOfFile)); rec.send(UPDATE_PROGRESS, resultData); output.write(data, 0, count); } else { break; } } } success = true;

Answer 3

点击按钮添加此项。修改if条件以满足您的需求。我正在上传视频，当我点击删除时，会发生这种情况： -

              if(processFileUploadTask !=null && processFileUploadTask.getStatus() != AsyncTask.Status.FINISHED){

                Thread t = new Thread(new Runnable() {
                    public void run() {

                        if(httpost != null ){
                            httpost.abort();
                        }

                    }
                });
                t.start();

停止下载按钮单击android

3 个答案: