MainActivity

package baitap.gameloft.com.bai_tap_intent; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity { public static int change = 0; EditText hs_a, hs_b; Button btn_kq; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); hs_a = (EditText)findViewById(R.id.hs_a); hs_b = (EditText)findViewById(R.id.hs_b); btn_kq = (Button)findViewById(R.id.btn_kq); //------------------------------------------- btn_kq.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if( isNumeric(hs_a.getText().toString()) && isNumeric(hs_b.getText().toString())){ Intent myIntent = new Intent(MainActivity.this, ResultActivity.class); int a = Integer.parseInt(hs_a.getText().toString()); int b = Integer.parseInt(hs_b.getText().toString()); Bundle myBun = new Bundle(); myBun.putInt("soA",a); myBun.putInt("soB",b); myIntent.putExtra("myPackage",myBun); startActivity(myIntent); } else { Toast.makeText(MainActivity.this, "Vui lòng nhập lại", Toast.LENGTH_SHORT).show(); } } }); if (change==1) { hs_a.setText("0"); hs_b.setText("0"); Intent intent_nhan = getIntent(); Bundle bun_nhan = intent_nhan.getBundleExtra("myPackage"); int a_nhan = bun_nhan.getInt("soA"); int b_nhan = bun_nhan.getInt("soB"); Toast.makeText(MainActivity.this, "Chào mừng trở lại Main Activity, số đã nhập là a = "+a_nhan+" b= "+b_nhan, Toast.LENGTH_SHORT).show(); } } public static boolean isNumeric(String str) { for (char c : str.toCharArray()) { if (!Character.isDigit(c)) return false; } return true; } }