import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
public class MainActivity extends AppCompatActivity {
private LinearLayout b_1, b_2, b_3;
private Button btn_start;
private boolean start_stop = false;
private int counter = 0;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b_1 = findViewById(R.id.light_bulb_1);
b_2 = findViewById(R.id.light_bulb_2);
b_3 = findViewById(R.id.light_bulb_3);
btn_start = findViewById(R.id.btn_start);
}
public void onClickStart(View view) {
if (!start_stop) {
btn_start.setText("Stop");
start_stop = true;
new Thread(new Runnable() {
@Override public void run() {
while (start_stop) {
counter++;
switch (counter) {
case 1:
b_1.setBackgroundColor(getResources().getColor(
R.color.green));
b_2.setBackgroundColor(getResources().getColor(R.color.grey));
b_3.setBackgroundColor(getResources().getColor(R.color.grey));
break;
case 2:
b_1.setBackgroundColor(getResources().getColor(R.color.grey));
b_2.setBackgroundColor(getResources().getColor(R.color.yellow));
b_3.setBackgroundColor(getResources().getColor(R.color.grey));
break;
case 3:
b_1.setBackgroundColor(getResources().getColor(R.color.grey));
b_2.setBackgroundColor(getResources().getColor(R.color.grey));
b_3.setBackgroundColor(getResources().getColor(
R.color.red));
counter = 0;
break;
}
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}else{
start_stop = false;
btn_start.setText("Start");
}
}
@Override protected void onDestroy() {
super.onDestroy();
start_stop = false;
}
}