CODEWITHSUNDEEP
androidcheckboxhidden
user2976492
user2976492

Reputation:

Hidden disabled button and checkboxes

I need some help with a small code. Basically I have a button and some generated checkboxes (don't know how many). The button should be hidden and disabled as long as no check-box is checked. When one or more check-boxes are checked the button should be shown and enabled . How can I do this?

Upvotes: 0

Views: 1466

Answers (6)

user2980295
user2980295

Reputation: 21

putting in an example ...

XML file:

<CheckBox android:id="@+idMain/check1"
    android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

<CheckBox android:id="@+idMain/check2"
    android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

<CheckBox android:id="@+idMain/check3"
    android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

<Button
    android:id="@+idMain/button"
    android:layout_width="wrap_content"
android:layout_height="wrap_content" 
android:visibility="invisible"/>

Activity:

public class MainActivity extends Activity {

LinearLayout idLayoutThisXml;
Button btn;


public boolean verifyChecked(){
    idLayoutThisXml = (LinearLayout) findViewById(idMain.layout);
    for (int i = 0; i < idLayoutThisXml.getChildCount(); i++) {
        View v = idLayoutThisXml.getChildAt(i);
        if(v instanceof CheckBox){
            if(((CheckBox)v).isChecked()){
                return true;
            }
        }
    }
    return false;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = (Button) findViewById(idMain.button);
    if(verifyChecked()){
        btn.setVisibility(View.VISIBLE);
    }
    else{
        btn.setVisibility(View.INVISIBLE);
    }
}

}

so I have a layout that has children of type CheckBox, and testing will all CheckBox llinearLayout, meet at least one marked. the button becomes visible.

Upvotes: 1

user2980295
user2980295

Reputation: 21

you have a check box in the XML ok? handle the checkBox in activity with

CheckBox c = (CheckBox) findViewById (idThisCheckBoxInXml)

and an

if (c.isActivated ()) {
    botao.setVisibility (View.INVISIBLE) or botao.setVisibility (View.VISIBLE)
}

would be something like this? excuse my bad english ...

Upvotes: 0

user2980295
user2980295

Reputation: 21

would be something like this?

public class MainActivity extends Activity {

LinearLayout idLayoutThisXml;
Button btn;


public boolean verifyChecked(){
    idLayoutThisXml = (LinearLayout) findViewById(idCadastro.linearLayout);
    for (int i = 0; i < idLayoutThisXml.getChildCount(); i++) {
        View v = idLayoutThisXml.getChildAt(i);
        if(v instanceof CheckBox){
            if(((CheckBox)v).isChecked()){
                return true;
            }
        }
    }
    return false;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = (Button) findViewById(idMain.button);
    if(verifyChecked()){
        btn.setVisibility(View.VISIBLE);
    }
    else{
        btn.setVisibility(View.INVISIBLE);
    }
}

}

Upvotes: 1

codeMagic
codeMagic

Reputation: 44571

Simply create a counter variable

public class MyActivity extends Activity
{
    int counter = 0;

    //onCreate() and other code

then set an onCheckedChangedListener() on your CheckBoxes and increment/decrement the value based on if the box was checked

onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
    if (isChecked)
    {
        counter++;
    }
    else
    {
        counter--;
    }
    /* if (counter > 0)
          change visibility
    */
}

Obviously you cannot copy/paste this code but should give you a pretty good idea.

OnCheckedChangedListener

setVisibility()

Upvotes: 1

KalVentures
KalVentures

Reputation: 46

Set the button visibility to invisible 

<Button android:id="@+id/mybutton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello" 
        android:visibility="invisible"/>

then call 

Button btn = (Button)findViewById(R.id.thebuttonid);
btn.setVisibility(View.VISIBLE); //View.GONE, View.INVISIBLE are available too.

When conditions are met. http://developer.android.com/reference/android/view/View.html

Conditionally displaying button

Upvotes: 0

Embattled Swag
Embattled Swag

Reputation: 1469

myButton.setVisibility(View.INVISIBLE);

And then, in the CheckBox's OnClickListener, do myButton.setVisibility(View.VISIBLE);

Upvotes: 0

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