controlbotoes android

MainAcitivity
package com.example.freddyalc.controlesejemp2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
//EJEMPLO DE BOTONES
public class MainActivity extends AppCompatActivity implements
View.OnClickListener{
EditText editElegido;
Button BtnAndroid,BtnIphone,BtnLinux;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editElegido = (EditText) findViewById(R.id.editElegido);
BtnAndroid = (Button) findViewById(R.id.BtnAndroid);
BtnAndroid.setOnClickListener(this);
BtnIphone = (Button) findViewById(R.id.BtnIphone);
BtnIphone.setOnClickListener(this);
BtnLinux = (Button) findViewById(R.id.BtnLinux);
BtnLinux.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.BtnAndroid:
editElegido.setText("Me cambiaste Android");
break;
case R.id.BtnIphone:
editElegido.setText("Me cambiaste Iphone");
break;
case R.id.BtnLinux:
editElegido.setText("Me cambiaste Linux");
break;
}
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.freddyalc.controlesejemp2.MainActivity">
<EditText
android:id="@+id/editElegido"

android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="20"
android:inputType="textPersonName"
android:layout_alignParentTop="true"
/>
<Button
android:id="@+id/BtnAndroid"
android:layout_below="@id/editElegido"
android:layout_marginTop="20dp"
android:text="Android System"
/>
<Button
android:id="@+id/BtnIphone"
android:layout_alignLeft="@+id/BtnAndroid"
android:layout_below="@+id/BtnAndroid"
android:text="OS System" />
<Button
android:id="@+id/BtnLinux"
android:layout_below="@id/BtnIphone"
android:text="Linux System"
/>
</RelativeLayout>

controlbotoes android

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