ساخت جستجو در برنامه

جواب سوال اول:

public class MainActivity extends Activity {
    EditText editText;
    TextView textView;
    ArrayList<String> buttons;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button1 = (Button) findViewById(R.id.button);
        Button button2 = (Button) findViewById(R.id.button2);
        Button btnOk = (Button) findViewById(R.id.btnOk);
        editText = (EditText) findViewById(R.id.editText);
        textView = (TextView) findViewById(R.id.textView);

        String buttonText1 = button1.getText().toString();
        String buttonText2 = button2.getText().toString();
        buttons = new ArrayList<String>();
        buttons.add(buttonText1);
        buttons.add(buttonText2);

        btnOk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String selectedItem = editText.getText().toString();
                for (int i=0;i<buttons.size();i++){
                    if (buttons.get(i).contains(selectedItem)){
                        textView.setText(buttons.get(i));
                    }
                    else{
                        textView.setText("not found");
                    }
                }
            }
        });
    }
}