Нужен совет по реализации приложения

public class MainActivity extends Activity implements OnClickListener {
 
ListView lvMain;
Button btnChecked;
ArrayAdapter<String> adapter;
 
 
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 
 
    findViewById();
 
    String[] List_ch = 
    getResources().getStringArray(R.array.list_CH);
    adapter = new ArrayAdapter<String>(this, 
    android.R.layout.simple_list_item_multiple_choice, List_ch);
    lvMain.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    lvMain.setAdapter(adapter);
 
    btnChecked.setOnClickListener(this);
}
private void findViewById() {
    lvMain = (ListView) findViewById(R.id.lvMain);
    btnChecked = (Button) findViewById(R.id.btnChecked);
 
 
}
 
public void onClick(View v) {
    SparseBooleanArray checked = lvMain.getCheckedItemPositions();
    ArrayList<String> selectedItems = new ArrayList<String>();
    for (int i = 0; i < checked.size(); i++) {
        int position = checked.keyAt(i);
 
        if (checked.valueAt(i))
        selectedItems.add(adapter.getItem(position));
 
 
    }
    String[] outputStrArr = new String[selectedItems.size()];
    for (int i = 0; i < selectedItems.size(); i++) {
        outputStrArr[i] = selectedItems.get(i);
 
    }
    Intent intent = new Intent(getApplicationContext(), 
    Second_activity.class);
 
    Bundle b = new Bundle();
    b.putStringArray("selectedItems", outputStrArr);
 
    intent.putExtras(b);
 
    startActivity(intent);

public class Second_activity extends AppCompatActivity {
 
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
 
    Bundle b = getIntent().getExtras();
    String [] resultArr = b.getStringArray("selectedItems");
    ListView lv = (ListView) findViewById(R.id.Checked);
 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
    android.R.layout.simple_list_item_1, resultArr);
    lv.setAdapter(adapter);