I can’t change the layout on android

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hello guys I’m making an old game app for android,when the app starts I want this one to call the test layout,and when I click the test layout button I want to go to the layout that has the old game, so when I put it on:

setContentView(R.layout.teste); in my code java the app when it opens appears fatal error, but when I put: setContentView(R.layout.activity_velha); it works normally

java code:

package com.example.pc_vicl.velhaiftm;

import android.app.AlertDialog;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.view.*;
import android.widget.EditText;
import android.widget.TextView;


public class velha extends AppCompatActivity {

    private Button L11,L12,L13,L21,L22,L23,L31,L32,L33;
    private TextView J1wins,J2wins,Velhaswins,J1text,J2text;
    private EditText N1,N2;
    public String nome1,nome2;
    public int vez;
    public int wj1;
    public int wj2;
    public int velhw;
    public int[][]tab;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.teste);
        N1=(EditText) findViewById(R.id.editText);
        N2=(EditText) findViewById(R.id.editText2);
        L11=(Button) findViewById(R.id.buttonL11);
        L12=(Button) findViewById(R.id.buttonL12);
        L13=(Button) findViewById(R.id.buttonL13);
        L21=(Button) findViewById(R.id.buttonL21);
        L22=(Button) findViewById(R.id.buttonL22);
        L23=(Button) findViewById(R.id.buttonL23);
        L31=(Button) findViewById(R.id.buttonL31);
        L32=(Button) findViewById(R.id.buttonL32);
        L33=(Button) findViewById(R.id.buttonL33);
        J1wins=(TextView) findViewById(R.id.j1win);
        J2wins=(TextView) findViewById(R.id.j2win);
        Velhaswins=(TextView) findViewById(R.id.velhaswin);
        J1text=(TextView) findViewById(R.id.textj1);
        J2text=(TextView) findViewById(R.id.textj2);
        vez=0;
        wj1=0;
        wj2=0;
        velhw=0;
        J1text.setTextColor(Color.BLUE);
        J2text.setTextColor(Color.BLACK);


        tab=new int[3][3];
        for(int cont=0;cont<3;cont++){
            for(int cont2=0;cont2<3;cont2++){
               tab[cont][cont2]=0;

            }
        }

    }
    public void jgnovamente(){
        for(int cont=0;cont<3;cont++){
            for(int cont2=0;cont2<3;cont2++){
                tab[cont][cont2]=0;

            }
        }
        String name=" ";
        L11.setText(name);
        L12.setText(name);
        L13.setText(name);
        L21.setText(name);
        L22.setText(name);
        L23.setText(name);
        L31.setText(name);
        L32.setText(name);
        L33.setText(name);

    }


    public void vamos(){

        nome1=N1.getText().toString();
        nome2=N2.getText().toString();

        if(nome1.trim().isEmpty()||nome2.trim().isEmpty()){
            AlertDialog.Builder dlg= new AlertDialog.Builder(this);
            dlg.setMessage("Por Favor Informe os Nomes.\n");
            dlg.setNegativeButton("ok", null);
            dlg.show();
        }
        J1text.setText(nome1);
        J2text.setText(nome2);
        setContentView(R.layout.activity_velha);

    }
    public void jogador1win(){
        AlertDialog.Builder dlg= new AlertDialog.Builder(this);
        dlg.setMessage(""+nome1+" Ganhou\n");
        dlg.setNegativeButton("ok", null);
        dlg.show();
        wj1++;
        String name=String.valueOf(wj1);
        J1wins.setText(name);
        jgnovamente();
    }
    public void jogador2win(){
        AlertDialog.Builder dlg= new AlertDialog.Builder(this);
        dlg.setMessage(""+nome2+" Ganhou\n");
        dlg.setNegativeButton("ok", null);
        dlg.show();
        wj2++;
        String name=String.valueOf(wj2);
        J2wins.setText(name);
        jgnovamente();

    }
    public void velhawin(){
        AlertDialog.Builder dlg= new AlertDialog.Builder(this);
        dlg.setMessage("Velha.\n");
        dlg.setNegativeButton("ok", null);
        dlg.show();
        velhw++;
        String name=String.valueOf(velhw);
        Velhaswins.setText(name);
        jgnovamente();
    }
    public void verificar(int v[][]){

    int[] horizotal,vertical;

    horizotal=new int [3];
    vertical=new int [3];
    for(int cont=0;cont<3;cont++){
        horizotal[cont]=v[cont][0]+v[cont][1]+v[cont][2];
        if(horizotal[cont]==9){
            jogador2win();
        }
        if(horizotal[cont]==15){
            jogador1win();
        }
    }
    for(int cont2=0;cont2<3;cont2++){
        vertical[cont2]=v[0][cont2]+v[1][cont2]+v[2][cont2];
        if(vertical[cont2]==9){
            jogador2win();
        }
        if(vertical[cont2]==15){
            jogador1win();
        }
    }
        int dig1=v[0][0]+v[1][1]+v[2][2];
        int dig2=v[2][0]+v[1][1]+v[0][2];
        if(dig1==9){
            jogador2win();
        }
        if(dig1==15){
            jogador1win();
        }
        if(dig2==9){
            jogador2win();
        }
        if(dig2==15){
            jogador1win();
        }
        int nj=0;
        for(int cont=0;cont<3;cont++){
            for(int cont2=0;cont2<3;cont2++){
                if(v[cont][cont2]==3||v[cont][cont2]==5){
                    nj++;
                    if(nj==9){
                        velhawin();
                    }
                }
            }
        }

    }
    public int vezdequem(){

        vez++;
        int vezde;
        if(vez%2==0){
            vezde=3;
            J2text.setTextColor(Color.BLACK);
            J1text.setTextColor(Color.BLUE);
        }else{
            vezde=5;
            J1text.setTextColor(Color.BLACK);
            J2text.setTextColor(Color.RED);
        }

        return vezde;
    }
    public String mudaricone(int b){

        int thebutton=0;
        String name;

    for(int cont=0;cont<3;cont++) {
        for(int cont2=0;cont2<3;cont2++){
         thebutton++;

         if(thebutton==b){

        if (tab[cont][cont2]!=3&&tab[cont][cont2]!=5) {
            tab[cont][cont2] = vezdequem();
            if(tab[cont][cont2]==3){
                //mudar buton para O
                name="O";
                return name;

            }
            if(tab[cont][cont2]==5){
                //mudar buton para X
                name="X";
                return name;

            }

        } else {
            //alert para escolher outro
            AlertDialog.Builder dlgg= new AlertDialog.Builder(this);
            dlgg.setMessage("Por favor realize uma jogava Valida.\n");
            dlgg.setNegativeButton("ok", null);
            dlgg.show();
            if(tab[cont][cont2]==5){
                name="X";
                return name;
            }
            if(tab[cont][cont2]==3){
                name="O";
                return name;

            }



        }}


    }}

        return null;

    }


    public void b11 (View v){
        int ok11=1;
        String name=mudaricone(ok11);
        L11.setText(name);
        verificar(tab);
    }
    public void b12 (View v){
        int ok11=2;
        String name=mudaricone(ok11);
        L12.setText(name);
        verificar(tab);

    }
    public void b13 (View v){
        int ok11=3;
        String name=mudaricone(ok11);
        L13.setText(name);
        verificar(tab);
    }
    public void b21 (View v){
        int ok11=4;
        String name=mudaricone(ok11);
        L21.setText(name);
        verificar(tab);
    }
    public void b22 (View v){
        int ok11=5;
        String name=mudaricone(ok11);
        L22.setText(name);
        verificar(tab);
    }
    public void b23 (View v){
        int ok11=6;
        String name=mudaricone(ok11);
        L23.setText(name);
        verificar(tab);
    }
    public void b31 (View v){
        int ok11=7;
        String name=mudaricone(ok11);
        L31.setText(name);
        verificar(tab);
    }
    public void b32 (View v){
        int ok11=8;
        String name=mudaricone(ok11);
        L32.setText(name);
        verificar(tab);
    }
    public void b33 (View v){
        int ok11=9;
        String name=mudaricone(ok11);
        L33.setText(name);
        verificar(tab);
    }
}

xml code of the test:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Nome do Jogador 1:"
        android:id="@+id/textView"
        android:layout_marginTop="147dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="17dp"
        android:layout_marginStart="17dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Nome do Jogador 2:"
        android:id="@+id/textView2"
        android:layout_below="@+id/editText"
        android:layout_toLeftOf="@+id/editText2"
        android:layout_toStartOf="@+id/editText2"
        android:layout_marginTop="40dp" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:ems="10"
        android:id="@+id/editText"
        android:layout_alignBaseline="@+id/textView"
        android:layout_alignBottom="@+id/textView"
        android:layout_toRightOf="@+id/textView"
        android:layout_toEndOf="@+id/textView" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:ems="10"
        android:id="@+id/editText2"
        android:layout_alignBaseline="@+id/textView2"
        android:layout_alignBottom="@+id/textView2"
        android:layout_alignLeft="@+id/editText"
        android:layout_alignStart="@+id/editText" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Começar"
        android:id="@+id/comecar"
        android:layout_below="@+id/editText2"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="63dp"
        android:onClick="vamos"
        android:nestedScrollingEnabled="false" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Definir Nomes:"
        android:id="@+id/textView3"
        android:layout_marginBottom="49dp"
        android:layout_above="@+id/editText"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/desenvolvedor"
        android:id="@+id/textView4"
        android:layout_alignParentBottom="true"
        android:layout_alignLeft="@+id/textView2"
        android:layout_alignStart="@+id/textView2"
        android:layout_marginBottom="40dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Desenvolvedor:"
        android:id="@+id/textView5"
        android:layout_above="@+id/textView4"
        android:layout_alignLeft="@+id/textView4"
        android:layout_alignStart="@+id/textView4" />


</RelativeLayout>

activity_old xml code:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.pc_vicl.velhaiftm.velha">

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l11"
        android:id="@+id/buttonL11"
        android:layout_marginLeft="48dp"
        android:layout_marginStart="48dp"
        android:layout_marginTop="146dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:onClick="b11" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l12"
        android:id="@+id/buttonL12"
        android:layout_alignBottom="@+id/buttonL11"
        android:layout_toRightOf="@+id/buttonL11"
        android:layout_toEndOf="@+id/buttonL11"
        android:onClick="b12" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l13"
        android:id="@+id/buttonL13"
        android:layout_alignBottom="@+id/buttonL12"
        android:layout_toRightOf="@+id/buttonL12"
        android:layout_toEndOf="@+id/buttonL12"
        android:onClick="b13" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l21"
        android:id="@+id/buttonL21"
        android:layout_below="@+id/buttonL11"
        android:layout_alignLeft="@+id/buttonL11"
        android:layout_alignStart="@+id/buttonL11"
        android:onClick="b21" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l22"
        android:id="@+id/buttonL22"
        android:layout_below="@+id/buttonL12"
        android:layout_toRightOf="@+id/buttonL21"
        android:layout_toEndOf="@+id/buttonL21"
        android:onClick="b22"/>

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l23"
        android:id="@+id/buttonL23"
        android:layout_below="@+id/buttonL13"
        android:layout_toRightOf="@+id/buttonL22"
        android:layout_toEndOf="@+id/buttonL22"
        android:onClick="b23"/>

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l31"
        android:id="@+id/buttonL31"
        android:layout_below="@+id/buttonL21"
        android:layout_alignLeft="@+id/buttonL21"
        android:layout_alignStart="@+id/buttonL21"
        android:onClick="b31"/>

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l32"
        android:id="@+id/buttonL32"
        android:layout_alignBottom="@+id/buttonL31"
        android:layout_toRightOf="@+id/buttonL31"
        android:layout_toEndOf="@+id/buttonL31"
        android:onClick="b32"/>

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="80dp"
        android:layout_height="50dp"
        android:text="@string/l33"
        android:id="@+id/buttonL33"
        android:layout_alignBottom="@+id/buttonL32"
        android:layout_toRightOf="@+id/buttonL32"
        android:layout_toEndOf="@+id/buttonL32"
        android:onClick="b33"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="0"
        android:id="@+id/j2win"
        android:textSize="20dp"
        android:layout_below="@+id/j1win"
        android:layout_alignLeft="@+id/j1win"
        android:layout_alignStart="@+id/j1win" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="0"
        android:id="@+id/velhaswin"
        android:textSize="20dp"
        android:layout_below="@+id/j2win"
        android:layout_alignLeft="@+id/j2win"
        android:layout_alignStart="@+id/j2win" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="0"
        android:id="@+id/j1win"
        android:textSize="20dp"
        android:layout_marginTop="10dp"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/buttonL11"
        android:layout_alignEnd="@+id/buttonL11" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="Jogador 1:   "
        android:id="@+id/textj1"
        android:textSize="20dp"
        android:layout_alignTop="@+id/j1win"
        android:layout_toLeftOf="@+id/j2win"
        android:layout_toStartOf="@+id/j2win"
        android:textColor="#0000ff" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="Jogador 2:  "
        android:id="@+id/textj2"
        android:textSize="20dp"
        android:layout_alignTop="@+id/j2win"
        android:layout_alignLeft="@+id/textj1"
        android:layout_alignStart="@+id/textj1"
        android:textColor="#ff0000" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="Velha:  "
        android:id="@+id/textView6"
        android:textSize="20dp"
        android:layout_below="@+id/textj2"
        android:layout_alignRight="@+id/textj2"
        android:layout_alignEnd="@+id/textj2" />
</RelativeLayout>
android

1 answer

2


Once you call the method setContentView() passing a layout as parameter, you can only manipulate and instantiate the elements of this layout, so once you called setContentView(R.layout.teste) you can only manipulate elements contained in the file xml test., that is to say:

  1. The Textviews textView, textView2, textView3, textView4, textView5
  2. Os Edittexts editext, editext2
  3. The Button get started

However, in your code, what you do is try to access the elements that are in the file activity_old making

    N1=(EditText) findViewById(R.id.editText);
    N2=(EditText) findViewById(R.id.editText2);
    L11=(Button) findViewById(R.id.buttonL11);
    L12=(Button) findViewById(R.id.buttonL12);
    L13=(Button) findViewById(R.id.buttonL13);
    L21=(Button) findViewById(R.id.buttonL21);
    L22=(Button) findViewById(R.id.buttonL22);
    L23=(Button) findViewById(R.id.buttonL23);
    L31=(Button) findViewById(R.id.buttonL31);
    L32=(Button) findViewById(R.id.buttonL32);
    L33=(Button) findViewById(R.id.buttonL33);
    J1wins=(TextView) findViewById(R.id.j1win);
    J2wins=(TextView) findViewById(R.id.j2win);
    Velhaswins=(TextView) findViewById(R.id.velhaswin);
    J1text=(TextView) findViewById(R.id.textj1);
    J2text=(TextView) findViewById(R.id.textj2);

Hence the application is giving crash, it is trying to access layout elements that do not exist in the file xml test.

You have two options to get around the problem:

  1. Create a new Activity using the layout test

    In this case, when the user clicked the button layout_teste of his activity_old, she would call a new Activity, which would be her Activity containing the test layout.

  2. Utilise Fragments to create and change layout dynamically

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