在RecyclerView中的特定位置更新SeekBar

本文介绍了在RecyclerView中的特定位置更新SeekBar的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在创建一个用于下载歌曲的应用程序.在我的应用程序中，有一个RecyclerView带有歌曲列表，每首歌曲下方都有一个SeekBar，它显示了下载进度.当我按下下载按钮时，它可以正常工作，但是会更新错误的SeekBar.我想在特定位置更新特定的SeekBar.这是我的RecyclerView适配器:

I am creating an application for downloading songs. In my application, there is a RecyclerView with a list of songs and with every song there is a SeekBar below that shows the download progress. When I hit the download button, it works fine but it updates the wrong SeekBar. I want to update a particular SeekBar at a particular position. Here is my adapter for the RecyclerView:

@Override public SongListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { itemViewLayout = LayoutInflater.from(parent.getContext()).inflate(R.layout.song_list_single_list, null); holder = new ViewHolder(itemViewLayout); return holder; } @Override public void onBindViewHolder(SongListAdapter.ViewHolder holder, final int position) { mSongListModel = mSongListArray.get(position); holder.downloadLink.setText(mSongListModel.getDownloadLink()); holder.downloadButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { new DownloadFileAsync().execute(String.valueOf(position)); } }); } @Override public int getItemCount() { return mSongListArray.size(); } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { System.out.println("Permission: " + permissions[0] + "was " + grantResults[0]); //resume tasks needing this permission //downloadStreamingAudio(); } } public class ViewHolder extends RecyclerView.ViewHolder { private TextView downloadLink; private SeekBar downloadProgress; private TextView downloadButton; public ViewHolder(View itemView) { super(itemView); downloadLink = (TextView) itemView.findViewById(R.id.downloadLink); downloadButton = (TextView) itemView.findViewById(R.id.downloadButton); downloadProgress = (SeekBar) itemViewLayout.findViewById(R.id.downloadProgress); } } class DownloadFileAsync extends AsyncTask<String, String, String> { ProgressDialog pDialog; Uri uri; String timeStamp; @Override protected void onPreExecute() { super.onPreExecute(); pDialog = new ProgressDialog(c); pDialog.setMessage("Downlaoding Audio..."); pDialog.setCancelable(true); pDialog.show(); } @Override protected String doInBackground(String... params) { try { if (isStoragePermissionGranted()) { File root = Environment.getExternalStorageDirectory(); File dir = new File(root.getAbsolutePath() + "/AppDownloads/"); timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); System.out.println("Time Stamp::----" + timeStamp); try { if (dir.exists() == false) { dir.mkdirs(); } RootFile = new File(dir, timeStamp + ".mp3"); } catch (Exception e) { e.printStackTrace(); } } InputStream input = null; OutputStream output = null; HttpURLConnection connection = null; int count; System.out.println("DownloadUrl::::----"+mSongListArray.get(Integer.parseInt(params[0])).getDownloadLink()); URL url = new URL(mSongListArray.get(Integer.parseInt(params[0])).getDownloadLink()); connection = (HttpURLConnection) url.openConnection(); connection.connect(); // this will be useful so that you can show a tipical 0-100% progress bar int lenghtOfFile = connection.getContentLength(); // downlod the file input = new BufferedInputStream(url.openStream()); output = new FileOutputStream(RootFile); byte data[] = new byte[1024]; long total = 0; while ((count = input.read(data)) != -1) { total += count; // publishing the progress.... //publishProgress((int)(total*100/lenghtOfFile)); updateDownloadProgress((int) (total * 100 / lenghtOfFile)); output.write(data, 0, count); } output.flush(); output.close(); input.close(); } catch (Exception e) { Log.d("Error....", e.toString()); } return null; } @Override protected void onPostExecute(String s) { super.onPostExecute(s); if (pDialog.isShowing()) pDialog.dismiss(); Toast.makeText(c, "Download Complete", Toast.LENGTH_LONG).show(); } } public boolean isStoragePermissionGranted() { if (Build.VERSION.SDK_INT >= 23) { if (c.checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) { System.out.println("Permission is granted"); return true; } else { System.out.println("Permission is revoked"); ActivityCompat.requestPermissions((Activity) c, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1); return false; } } else { System.out.println("Permission is granted"); return true; } } private void updateDownloadProgress(int progress) { holder.downloadProgress.setProgress(progress); }

这是我的RecyclerView的布局文件:

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="schemas.android/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" android:padding="10dp"> <LinearLayout android:id="@+id/LinearLayout" android:layout_width="match_parent" android:layout_height="wrap_content"> <TextView android:id="@+id/downloadLink" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:padding="10dp" /> <TextView android:id="@+id/downloadButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/custom_button" android:text="DOWNLOAD" android:textSize="15sp" /> <TextView android:id="@+id/playButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:background="@drawable/custom_button" android:text="PLAY" android:textSize="15sp" android:visibility="gone" /> </LinearLayout> <SeekBar android:id="@+id/downloadProgress" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/LinearLayout" android:layout_marginTop="10dp" /> </RelativeLayout>

关于如何实现这一目标的任何建议?

Any suggestions on how to achieve this?

推荐答案

您的程序是紧密耦合的.我建议您将程序分为3个阶段. 然后在onProgressUpdated

Your program is tightly-coupled. I recommend you to split program into 3 peaces. And Call notifyItemChanged at onProgressUpdated

下面的代码是示例.

RecyclerView.Adapter像这样:

RecyclerView.Adapter like this:

public class SongListAdapter extends RecyclerView.Adapter<SongListAdapter.ViewHolder> { ... private final Listener mListener; private final Map<Integer, Integer> progressMap = new HashMap<>(); ... interface Listener { void onClickDownload(int position, SongListModel songListModel); } public SongListAdapter(Listener listener) { mListener = listener; } @Override public void onBindViewHolder(SongListAdapter.ViewHolder holder, final int position) { ... int progress = progressMap.containsKey(position) ? progressMap.get(position) : 0; holder.downloadProgress.setProgress(progress); holder.downloadButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { SongListModel songListModel = mSongListArray.get(position); mListener.onClickDownload(position, songListModel); } }); } ... public void setProgress(int position, int progress) { progressMap.put(position, progress); } ... }

像这样的DownloadFileAsync:

DownloadFileAsync like this:

public class DownloadFileAsync extends AsyncTask<String, String, String> { ... private final Callback mCallback; private final int mPosition; private final SongListModel mSongListModel; interface Callback { void onDownloadStarting(); void onProgressUpdated(int progress, int position, SongListModel songListModel); void onDownloadCompleted(); } public DownloadFileAsync(Callback callback, int position, SongListModel songListModel) { mCallback = callback; mPosition = position; mSongListModel = songListModel; } @Override protected void onPreExecute() { mCallback.onDownloadStarting(); } @Override protected String doInBackground(String... params) { try { ... while ((count = input.read(data)) != -1) { ... mCallback.onProgressUpdated((int) (total * 100 / lenghtOfFile), mPosition, mSongListModel); ... if (isCancelled()) { break; } } ... } return null; } ... @Override protected void onPostExecute(String s) { mCallback.onDownloadCompleted(s); } }

这样的活动:

public class MainActivity extends AppCompatActivity implements SongListAdapter.Listener, DownloadFileAsync.Callback { ... private RecyclerView mRecyclerView; private SongListAdapter mAdapter; private DownloadFileAsync mDownloadFileAsync; private ProgressDialog pDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ... mRecyclerView = (RecyclerView)findViewById(...); mAdapter = new SongListAdapter(this); mRecyclerView.setAdapter(adapter); ... } @Override public void onClickDownload(int position, SongListModel songListModel) { if (mDownloadFileAsync != null) { //TODO currentry downloading. Insert error handing. return; } mDownloadFileAsync = new DownloadFileAsync(this, position, songListModel); mDownloadFileAsync.execute(); } @Override public void onDownloadStarting() { pDialog = new ProgressDialog(this); pDialog.setMessage("Downlaoding Audio..."); pDialog.setCancelable(true); pDialog.show(); } @Override public void onProgressUpdated(int progress, int position, SongListModel songListModel) { mAdapter.setProgress(position, progress); SongListAdapter.ViewHolder holder = mRecyclerView.findViewHolderForAdapterPosition(position); if (holder != null) { holder.downloadProgress.setProgress(progress); } } @Override public void onDownloadCompleted(String s) { mDownloadFileAsync = null; if (pDialog.isShowing()) { pDialog.dismiss(); } Toast.makeText(this, "Download Complete", Toast.LENGTH_LONG).show(); } @Override protected void onDestroy() { super.onDestroy(); // If you want to stop downloading when activity is closing, call cancel method. if (mDownloadFileAsync != null) { mDownloadFileAsync.cancel(true); } } ... }