PRÁTICA 6 – BUTTON E TEXTVIEW

Objetivo:

Utilizar Buttons e TextViews em uma aplicativo.

Introdução

textViews -> Qualquer texto na tela. Fixo ou modificável em tempo de execução.

buttons -> Objeto clicável que dispara o evento onclick.

Tarefa:

Criar tipos aplicações de textView e buttons:

Programa 1 – Design padrão com um textView e um button:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView
        android:id="@+id/texto"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerInParent="false"
        android:text="Texto"
        android:layout_marginTop="14dp"
        android:textAppearance="?android:attr/textAppearanceLarge"
        />

    <Button
        android:id="@+id/botao"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="false"
        android:layout_centerInParent="true"
        android:text="Clique Aqui!"
        android:clickable="true"
        android:layout_below="@+id/texto" />

</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView

android:id="@+id/texto"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerInParent="false"

android:text="Texto"

android:layout_marginTop="14dp"

android:textAppearance="?android:attr/textAppearanceLarge"

<Button

android:id="@+id/botao"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="false"

android:layout_centerInParent="true"

android:text="Clique Aqui!"

android:clickable="true"

android:layout_below="@+id/texto" />

</RelativeLayout>

Programa 1 – OnClick Listener:

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

import android.content.Intent;
import android.renderscript.Double2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final TextView textView=(TextView)findViewById(R.id.texto);
        Button botao =  (Button)findViewById(R.id.botao);

        //Implement listener for your button so that when you click the
        //button, android will listen to it.

        botao.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                textView.setText("Você clicou!");
            }
        });
    }
}

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

import android.content.Intent;

import android.renderscript.Double2;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.MotionEvent;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.RelativeLayout;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final TextView textView=(TextView)findViewById(R.id.texto);

Button botao = (Button)findViewById(R.id.botao);

//Implement listener for your button so that when you click the

//button, android will listen to it.

botao.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// Perform action on click

textView.setText("Você clicou!");

}

});

}

Programa 2 – OnLongClick Listener:

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

import android.content.Intent;
import android.renderscript.Double2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final TextView textView=(TextView)findViewById(R.id.texto);
        Button botao =  (Button)findViewById(R.id.botao);

        //Implement listener for your button so that when you click the
        //button, android will listen to it.

        botao.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                textView.setText("Você clicou!");
                return false;
            }
        });
    }
}

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

import android.content.Intent;

import android.renderscript.Double2;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuInflater;

import android.view.MenuItem;

import android.view.MotionEvent;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.RelativeLayout;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final TextView textView=(TextView)findViewById(R.id.texto);

Button botao = (Button)findViewById(R.id.botao);

//Implement listener for your button so that when you click the

//button, android will listen to it.

botao.setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

textView.setText("Você clicou!");

return false;

}

});

}

Programa 3 – Modificando posição, cor e texto de um textView:

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

package empty.ammsoft.empty;

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

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final TextView textView=(TextView)findViewById(R.id.texto);
        Button botao =  (Button)findViewById(R.id.botao);

        //Implement listener for your button so that when you click the
        //button, android will listen to it.

        botao.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                textView.setText("Você clicou!");
                textView.setX(textView.getX()+10);
                textView.setY(textView.getY()+10);
                textView.setTextColor(Color.RED);
            }
        });
    }
}

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

package empty.ammsoft.empty;

import android.graphics.Color;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final TextView textView=(TextView)findViewById(R.id.texto);

Button botao = (Button)findViewById(R.id.botao);

//Implement listener for your button so that when you click the

//button, android will listen to it.

botao.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// Perform action on click

textView.setText("Você clicou!");

textView.setX(textView.getX()+10);

textView.setY(textView.getY()+10);

textView.setTextColor(Color.RED);

}

});

}

Desafio: Tente obter o mesmo resultado do programa 4 ao clicar no TextView, e não no botão:

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

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

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final TextView textView=(TextView)findViewById(R.id.texto);
        final Button botao =  (Button)findViewById(R.id.botao);

        //Implement listener for your button so that when you click the
        //button, android will listen to it.

        textView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                botao.setText("Você clicou!");
                botao.setX(botao.getX()+10);
                botao.setY(botao.getY()+10);
                botao.setTextColor(Color.RED);
            }
        });
    }
}

package nome do seu pacote! // Esta linha deve ser mantida com o nome do pacote!

import android.graphics.Color;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final TextView textView=(TextView)findViewById(R.id.texto);

final Button botao = (Button)findViewById(R.id.botao);

//Implement listener for your button so that when you click the

//button, android will listen to it.

textView.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {

// Perform action on click

botao.setText("Você clicou!");

botao.setX(botao.getX()+10);

botao.setY(botao.getY()+10);

botao.setTextColor(Color.RED);

}

});

}