Mostar / Hide Button and Textview

Question

I’m making my first App on Android Studio, but I’m having trouble doing something relatively easy. I need Click a Button to show Textview and another Button (which will hide Textview when clicked again). But all the alternatives I’ve researched and tried are crashing the app. Would anyone have any similar code or would have any suggestions?

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After help from @Skywalker the code was as follows, already working.

XML

    <Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Mostar_1"
    android:id="@+id/btnMostar_1"
    android:onClick= "clickBtnMostar_1"
    android:layout_gravity="center_horizontal" />

<Button
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Mostar_2"
    android:id="@+id/btnMostar_2"
    android:onClick= "clickBtnMostar_2"
    android:layout_gravity="center_horizontal" />

<LinearLayout
    android:id="@+id/LyMostar_1"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:visibility="invisible">


    <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Texto 1"
    android:id="@+id/textMostar_1"
    android:layout_below="@+id/LyMostar_1"
    android:layout_centerHorizontal="true"
        android:layout_gravity="center_horizontal" />

  <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Esconder1"
    android:id="@+id/btnEsconder1"
    android:layout_below="@+id/btnMostar_1"
        android:onClick= "clickBtnEsconder1"
    android:layout_centerHorizontal="true"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

<LinearLayout
    android:id="@+id/LyMostar_2"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:visibility="invisible">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Texto 2"
        android:id="@+id/textMostar_2"
        android:layout_below="@+id/LyMostar_2"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center_horizontal" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Esconder2"
        android:id="@+id/btnEsconder2"
        android:layout_below="@+id/btnMostar_2"
        android:onClick= "clickBtnEsconder2"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

Java

public LinearLayout LyMostar_1;
public LinearLayout LyMostar_2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tela2);
    LyMostar_1 = (LinearLayout) findViewById(R.id.LyMostar_1);
}

public void clickBtnMostar_1(View view) {

    LyMostar_1.setVisibility(View.VISIBLE);
}

public void clickBtnEsconder1 (View esc){
    LyMostar_1.setVisibility(View.INVISIBLE);
}


public void clickBtnMostar_2(View view) {
    LyMostar_2.setVisibility(View.VISIBLE);
}

public void clickBtnEsconder2 (View esc){
    LyMostar_2.setVisibility(View.INVISIBLE);
}

}

Answer 1

Put everything you want to hide inside a Linearlayout or some Layout of your preference and put an id for that Layout in xml.

<LinearLayout
        ....Layout principal da activity>
       <Button
            ...button que faz a ação de esconder o conteudo desejado
           />

       <LinearLayout
              android:id="@+id/ll_conteudo"
              ... layout que sera escondido...>
           <TextView .... />
           <Button ..... />
       </LinearLayout>
</LinearLayout>

In the java code on your Activity’s onCreate, you do the casting of this layout

llConteudo = (LinearLayout) findViewById(R.id.ll_conteudo);

In the action button Listener you must hide/show the content you implement as follows.

if(show){
    llConteudo.setVisibility(View.INVISIBLE);
    show = false;
}else{
    llConteudo.setVisibility(View.VISIBLE);
    show = true;
}

Note that you need to create a flag (a Boolean) to know the state of the content, invisible or visible.

I don’t know your level of knowledge, but if in doubt I can be less objective and exemplify more.

Your XML should look more or less like this: