MainActivity.java

package io.tus.android.example;

import android.app.AlertDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.widget.ContentLoadingProgressBar;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import com.google.android.material.button.MaterialButton;

import java.net.URL;

import io.tus.android.client.TusAndroidUpload;
import io.tus.android.client.TusPreferencesURLStore;
import io.tus.java.client.TusClient;
import io.tus.java.client.TusUpload;
import io.tus.java.client.TusUploader;


public class MainActivity extends AppCompatActivity {
    private final int REQUEST_FILE_SELECT = 1;
    private TusClient client;
    private TextView status;
    private MaterialButton pauseButton;
    private MaterialButton resumeButton;
    private UploadTask uploadTask;
    private ContentLoadingProgressBar progressBar;
    private Uri fileUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        try {
            SharedPreferences pref = getSharedPreferences("tus", 0);
            client = new TusClient();
            client.setUploadCreationURL(new URL("https://tusd.tusdemo.net/files/"));
            client.enableResuming(new TusPreferencesURLStore(pref));
        } catch (Exception e) {
            showError(e);
        }

        status = (TextView) findViewById(R.id.status);
        progressBar = (ContentLoadingProgressBar) findViewById(R.id.progressBar);

        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("*/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, "Select file to upload"), REQUEST_FILE_SELECT);

            }
        });

        pauseButton = (MaterialButton) findViewById(R.id.pause_button);
        pauseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                pauseUpload();
            }
        });

        resumeButton = (MaterialButton) findViewById(R.id.resume_button);
        resumeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                resumeUpload();
            }
        });
    }

    private void beginUpload(Uri uri) {
        fileUri = uri;
        resumeUpload();
    }

    public void setPauseButtonEnabled(boolean enabled) {
        pauseButton.setEnabled(enabled);
        resumeButton.setEnabled(!enabled);
    }

    public void pauseUpload() {
        uploadTask.cancel(false);
    }

    public void resumeUpload() {
        try {
            TusUpload upload = new TusAndroidUpload(fileUri, this);
            uploadTask = new UploadTask(this, client, upload);
            uploadTask.execute(new Void[0]);
        } catch (Exception e) {
            showError(e);
        }
    }

    private void setStatus(String text) {
        status.setText(text);
    }

    private void setUploadProgress(int progress) {
        progressBar.setProgress(progress);
    }

    private class UploadTask extends AsyncTask<Void, Long, URL> {
        private MainActivity activity;
        private TusClient client;
        private TusUpload upload;
        private Exception exception;

        public UploadTask(MainActivity activity, TusClient client, TusUpload upload) {
            this.activity = activity;
            this.client = client;
            this.upload = upload;
        }

        @Override
        protected void onPreExecute() {
            activity.setStatus("Upload selected...");
            activity.setPauseButtonEnabled(true);
            activity.setUploadProgress(0);
        }

        @Override
        protected void onPostExecute(URL uploadURL) {
            activity.setStatus("Upload finished!\n" + uploadURL.toString());
            activity.setPauseButtonEnabled(false);
        }

        @Override
        protected void onCancelled() {
            if (exception != null) {
                activity.showError(exception);
            }

            activity.setPauseButtonEnabled(false);
        }

        @Override
        protected void onProgressUpdate(Long... updates) {
            long uploadedBytes = updates[0];
            long totalBytes = updates[1];
            activity.setStatus("Uploaded " + (int) ((double) uploadedBytes / totalBytes * 100) + "% | " + String.format("%d/%d.", uploadedBytes, totalBytes));
            activity.setUploadProgress((int) ((double) uploadedBytes / totalBytes * 100));
        }

        @Override
        protected URL doInBackground(Void... params) {
            try {
                TusUploader uploader = client.resumeOrCreateUpload(upload);
                long totalBytes = upload.getSize();
                long uploadedBytes = uploader.getOffset();

                // Upload file in 1MiB chunks
                uploader.setChunkSize(1024 * 1024);

                while (!isCancelled() && uploader.uploadChunk() > 0) {
                    uploadedBytes = uploader.getOffset();
                    publishProgress(uploadedBytes, totalBytes);
                }

                uploader.finish();
                return uploader.getUploadURL();

            } catch (Exception e) {
                exception = e;
                cancel(true);
            }
            return null;
        }
    }

    private void showError(Exception e) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Internal error");
        builder.setMessage(e.getMessage());
        AlertDialog dialog = builder.create();
        dialog.show();
        e.printStackTrace();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode != RESULT_OK) {
            return;
        }

        if (requestCode == REQUEST_FILE_SELECT) {
            Uri uri = data.getData();
            beginUpload(uri);
        }
    }
}