Using ProgressBar with DownloadManager

Question

In my app, I use `DownloadManager` to download a file from Firebase. ``` import static android.os.Environment.DIRECTORY_DOWNLOADS; public class Physics extends AppCompatActivity { PDFView pdfView; FirebaseStorage firebaseStorage; StorageReference storageReference; StorageReference ref; File file; File files; ProgressBar progressBar; private Context context; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE); setContentView(R.layout.activity_physics1); pdfView = findViewById(R.id.pdfview); progressBar = (ProgressBar) findViewById(R.id.progressBar); Context mContext = getApplicationContext(); String path = mContext.getFilesDir().getAbsolutePath() + "/storage/emulated/0/Android/data/com.impwala.impwala/files/Download/asd.nomedia"; File file = new File("/storage/emulated/0/Android/data/com.impwala.impwala/files/Download/asd.nomedia"); if (fil…

Accepted Answer

Solution

Step 1. Declare the following variables in your class

```
// Indicate that we would like to update download progress
private static final int UPDATE_DOWNLOAD_PROGRESS = 1;

// Use a background thread to check the progress of downloading
private final ExecutorService executor = Executors.newFixedThreadPool(1);

// Use a hander to update progress bar on the main thread
private final Handler mainHandler = new Handler(Looper.getMainLooper(), new Handler.Callback() {
    @Override
    public boolean handleMessage(@NonNull Message msg) {
        if (msg.what == UPDATE_DOWNLOAD_PROGRESS) {
            int downloadProgress = msg.arg1;

// Update your progress bar here.
            progressBar.setProgress(downloadProgress);
        }
        return true;
    }
});
```

Step 2. Modify your `downloadFile()` method

```
public void downloadFile(Context context, String fileName, String fileExtension, String destinationDirectory, String url) {
    DownloadManager downloadManager = (DownloadManager) context.
            getSystemService(Context.DOWNLOAD_SERVICE);

Uri uri = Uri.parse(url);
    DownloadManager.Request request = new DownloadManager.Request(uri);

request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    request.setDestinationInExternalFilesDir(context, destinationDirectory, fileName + fileExtension);

long downloadId = downloadManager.enqueue(request);

// Run a task in a background thread to check download progress
    executor.execute(new Runnable() {
        @Override
        public void run() {
            int progress = 0;
            boolean isDownloadFinished = false;
            while (!isDownloadFinished) {
                Cursor cursor = downloadManager.query(new DownloadManager.Query().setFilterById(downloadId));
                if (cursor.moveToFirst()) {
                    int downloadStatus = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
                    switch (downloadStatus) {
                        case DownloadManager.STATUS_RUNNING:
                            long totalBytes = cursor.getLong(cursor.getColumnIndex(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
                            if (totalBytes > 0) {
                                long downloadedBytes = cursor.getLong(cursor.getColumnIndex(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
                                progress = (int) (downloadedBytes * 100 / totalBytes);
                            }

break;
                        case DownloadManager.STATUS_SUCCESSFUL:
                            progress = 100;
                            isDownloadFinished = true;
                            break;
                        case DownloadManager.STATUS_PAUSED:
                        case DownloadManager.STATUS_PENDING:
                            break;
                        case DownloadManager.STATUS_FAILED:
                            isDownloadFinished = true;
                            break;
                    }
                    Message message = Message.obtain();
                    message.what = UPDATE_DOWNLOAD_PROGRESS;
                    message.arg1 = progress;
                    mainHandler.sendMessage(message);
                }
            }
        }
    });
}
```

Note: Remember to release the executor and handler after downloading.

```
executor.shutdown();
mainHandler.removeCallbacksAndMessages(null);
```

Using ProgressBar with DownloadManager

Solution

Problem

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