Button events

Suppose you have two Activities , AtividadeA and AtividadeB , and that AtividadeA will have a button that will call AtividadeB .

It works like this:

1) In the layout of your first activity (which possibly has the name of activity_main.xml ) you include a button ( Button ) with a id ...

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/meuBotao"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Clique em mim"/>

</LinearLayout>

2) In your ActivityA you declare a button ...

private Button botao;

3) In the onCreate(Bundle savedInstanceState) method you initialize the button and associate it with View.OnClickListener ...

setContentView(R.layout.activity_main);
botao = (Button)findViewById(R.id.meuBotao);
botao.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent intent = new Intent(AtividadeA.this, AtividadeB.class);
        startActivity(intent);
    }
});

4) Do not forget to declare the two activities in AndroidManifest.xml:

<application>

    ...

    <activity android:name="AtividadeA">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity android:name="AtividadeB" />

    ...

</application>

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