MainActivity Loader

MainActivity.java

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.app.LoaderManager;
import android.content.Loader;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<BigData> {

    TextView textView1;
    ProgressBar progressBar1;
    Button button1;

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

        textView1 = (TextView)findViewById(R.id.textView1);
        progressBar1 = (ProgressBar)findViewById(R.id.progressBar1);
        button1 = (Button) findViewById(R.id.button1);

        getLoaderManager().initLoader(0, null, this);

        button1.setOnClickListener(v -> {
            progressBar1.setVisibility(View.VISIBLE);
            getLoaderManager().restartLoader(0, null, this);
        });
    }


    @Override
    public Loader<BigData> onCreateLoader(int i, Bundle bundle) {
        Log.d("test", "------------onCreateLoader");
        BigDataLoader loader = new BigDataLoader(getApplicationContext());
        loader.forceLoad();
        return loader;
    }

    @Override
    public void onLoadFinished(Loader<BigData> loader, BigData data) {
        textView1.setText(data.at(0));
        progressBar1.setVisibility(View.GONE);
    }

    @Override
    public void onLoaderReset(Loader<BigData> loader) {
        Log.d("test", "------------onLoaderReset");
    }

}