appwrite/docs/examples/0.12.x/client-android/java/storage/create-file.md

import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import kotlinx.coroutines.GlobalScope import kotlinx.coroutines.launch import io.appwrite.Client import io.appwrite.services.Storage

public class MainActivity extends AppCompatActivity {

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

    Client client = new Client(getApplicationContext())
        .setEndpoint("https://[HOSTNAME_OR_IP]/v1") // Your API Endpoint
        .setProject("5df5acd0d48c2"); // Your project ID

    Storage storage = new Storage(client);

    storage.createFile(
        "[FILE_ID]", 
        File("./path-to-files/image.jpg"), 
        new Continuation<Object>() {
            @NotNull
            @Override
            public CoroutineContext getContext() {
                return EmptyCoroutineContext.INSTANCE;
            }

            @Override
            public void resumeWith(@NotNull Object o) {
                String json = "";
                try {
                    if (o instanceof Result.Failure) {
                        Result.Failure failure = (Result.Failure) o;
                        throw failure.exception;
                    } else {
                        Response response = (Response) o;
                        json = response.body().string();
                    }                    
                } catch (Throwable th) {
                    Log.e("ERROR", th.toString());
                }
            }
        }
    );
}

}