package ir.apdroid.calc; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { EditText n1,n2; TextView result; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); } public void init(){ n1=(EditText)findViewById(R.id.editText1); n2=(EditText)findViewById(R.id.editText2); result=(TextView)findViewById(R.id.textView3); } public void add(View v){ try { int x = Integer.parseInt(n1.getText().toString()); int y = Integer.parseInt(n2.getText().toString()); int z = x + y; result.setText(String.valueOf(z)); } catch(Exception e){ Toast.makeText(this, "خطا در اعداد ورودی "+"\n"+e , Toast.LENGTH_LONG).show(); } } }