如何添加暂停和取消按钮到自定义下载通知android

Question

我已经创建了一个自定义通知,用于从给定的URL下载mp3文件.但我需要知道如何添加pause和cancel按钮到我创建的自定义通知.

以下是自定义通知的部分代码:

 if (!downloadUrl.toString().isEmpty()) {
                                    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(downloadUrl));
                                    request.setMimeType("audio/MP3");
                                    request.setTitle(vMeta.getTitle());
                                    request.allowScanningByMediaScanner();
                                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_HIDDEN);
                                    request.setDestinationInExternalPublicDir(storage, vMeta.getTitle() + extension);
                                    final DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

                                    final long id = manager.enqueue(request);


                                    registerReceiver(new DownloadReceiver(id, storage, vMeta.getTitle() + extension),
                                            new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
                                    mBuilder =  new NotificationCompat.Builder(getApplicationContext());
                                    Intent intent = new Intent();
                                    PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0);
                                    mBuilder.setContentIntent(pendingIntent);
                                    mBuilder.setSmallIcon(R.drawable.ic_music_video_white_24dp);
                                    mBuilder.setContentTitle("Downloading");
                                    mBuilder.setContentText(vMeta.getTitle());
                                    mBuilder.setOngoing(false);
                                    //mBuilder.addAction();
                                    mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

                                    new Thread(new Runnable() {
                                        @Override
                                        public void run() {

                                            boolean downloading = true;

                                            while (downloading) {
                                                DownloadManager.Query q = new DownloadManager.Query();
                                                q.setFilterById(id);
                                                Cursor cursor = manager.query(q);
                                                cursor.moveToFirst();
                                                if( cursor != null && cursor.moveToFirst() ) {
                                                    bytes_downloaded = cursor.getInt(cursor
                                                            .getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
                                                    bytes_total = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
                                                    dl_progress = (int) ((bytes_downloaded * 100l) / bytes_total);
                                                }
                                                mNotificationManager.notify(001, mBuilder.build());
                                                if (cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS)) == DownloadManager.STATUS_SUCCESSFUL) {
                                                    downloading = false;
                                                    mBuilder.setContentTitle("Download complete")
                                                            .setOngoing(false)
                                                            .setAutoCancel(true)
                                                            .setProgress(100,100,false);
                                                    mNotificationManager.notify(001, mBuilder.build());
                                                }


                                                runOnUiThread(new Runnable() {

                                                    @Override
                                                    public void run() {
                                                        mBuilder.setContentTitle("Downloading: "+dl_progress+"%");
                                                        mBuilder.setProgress(100,dl_progress,false);
                                                        mNotificationManager.notify(001, mBuilder.build());

                                                    }
                                                });

                                                cursor.close();
                                            }

                                        }
                                    }).start();



                                }
                            }
                        }
                    }.extract(ytLink, true, true);
                }
            });
        }
    }
    protected void onDestroy() {

        super.onDestroy();
    }
    public void onBackPressed(){
        super.onBackPressed();
    }

    public class DownloadReceiver extends BroadcastReceiver {
        private long id;
        private String dirType;
        private String subPath;

        public DownloadReceiver(long id, String dirType, String subPath) {
            this.id = id;
            this.dirType = dirType;
            this.subPath = subPath;
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            if (intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1) == id) {
                MainActivity.this.unregisterReceiver(this);
                File oldFile = new File(Environment.getExternalStoragePublicDirectory(dirType), subPath);
                String newSubPath = subPath.substring(0, subPath.lastIndexOf('.')) +"|MEGA"+".mp3";
                File newFile = new File(Environment.getExternalStoragePublicDirectory(dirType), newSubPath);
                Boolean result = oldFile.renameTo(newFile);
                Toast.makeText(context, "Download " + (result ? "succeeded" : "failed"), Toast.LENGTH_SHORT).show();
            }
        }
    }

Answer 1

您需要使用媒体控制将特定操作设置为通知，您可以添加具有相对挂起意图的特定操作

.addAction(R.drawable.ic_prev, "Previous", prevPendingIntent) 
.addAction(R.drawable.ic_pause, "Pause", pausePendingIntent) 
.addAction(R.drawable.ic_next, "Next", nextPendingIntent) 

您还需要使用以下代码设置媒体样式

 .setStyle(MediaNotificationCompat.MediaStyle()
 .setShowActionsInCompactView(1 /* #1: pause button \*/)
 .setMediaSession(mMediaSession.getSessionToken()))

您还可以查看此链接以获取更多说明。