I made the App to add two numbers, but when I put a start screen with just one button to call the sum screen, the calculations of the sum screen are inactive, how to solve?
MainActivity.java screen
package br.com.frutasalmeidasantos.www.testefinal;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void chamasolucao (View v) { setContentView(R.layout.activity_solucao); }
}
Soluction.java
package br.com.frutasalmeidasantos.www.testefinal;
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.TextView;
import android.widget.Toast;
public class Solucao extends AppCompatActivity {
EditText campo1;
EditText campo2;
Button btcalc;
TextView resposta;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_solucao);
campo1 = (EditText) findViewById(R.id.campo1);
campo2 = (EditText) findViewById(R.id.campo2);
btcalc = (Button) findViewById(R.id.btcalc);
resposta = (TextView) findViewById(R.id.resposta);
btcalc.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String scampo1 = campo1.getText().toString();
String scampo2 = campo2.getText().toString();
if (scampo1.isEmpty() || scampo2.isEmpty()){
Toast.makeText(Solucao.this, "", Toast.LENGTH_SHORT).show();
return;
}
int ncampo1 = Integer.parseInt(scampo1);
int ncampo2 = Integer.parseInt(scampo2);
int nresposta = ncampo1 + ncampo2;
resposta.setText(""+ncampo1+ "+" +ncampo2+ "=" +nresposta);
}
});
}
}
Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="br.com.frutasalmeidasantos.www.testefinal">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Solucao"></activity>
</application>
</manifest>