Develop Reference

Android - change textSize based on button pressed/unpressed state

I have a button background that change drawable if the state is pressed or not. I'm able to change text color and background like below but I would like to change text size. How can I do it .XML side?
drawable/button_selector.xml:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/toggle_pressed" android:state_selected="true" />
<item android:drawable="#drawable/toggle_pressed" android:state_pressed="true" />
<item android:drawable="#drawable/toggle_unpressed" />
</selector>
res/color/src_text:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false" android:state_selected="false" android:color="#color/blue2"/>
<item android:state_pressed="true" android:color="#color/color_concrete"/>
<item android:state_pressed="false" android:state_selected="true"
android:color="#color/color_concrete"/>
<item android:color="#color/blue2" />
</selector>
button:
<Button
android:id="#+id/playButton"
android:layout_width="200dp"
android:layout_height="70dp"
android:background="#drawable/button_selector"
android:onClick="#{(v)->mainViewModel.playButtonClick(v)}"
android:paddingStart="20dp"
android:paddingEnd="20dp"
android:text="#string/play"
android:textColor="#color/src_text"
android:textSize="40sp"
android:visibility="#{mainViewModel.observableVisibilityPlayButton ? v.VISIBLE : v.GONE}"/>

You can create subclass of Button and override onTouch method
#Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
// button pressed, change textSize
return true;
case MotionEvent.ACTION_UP:
// button released, revert textSize
return true;
}
return false;
}

Since you're using databinding you can probably create a BindingAdapter like following:
#JvmStatic
#BindingAdapter("textSize")
fun bindTextSize(button: Button, size: Int) {
if(button.isPressed())
button.setTextSize(TypedValue.COMPLEX_UNIT_SP, size);
}
Also keep a MutableLiveData field in the viewmodel (size) and change the value according to your need.
<Button
textSize="#{mainViewModel.size}
android:id="#+id/playButton"
android:layout_width="200dp"
android:layout_height="70dp"
android:background="#drawable/button_selector"
android:onClick="#{(v)->mainViewModel.playButtonClick(v)}"
android:paddingStart="20dp"
android:paddingEnd="20dp"
android:text="#string/play"
android:textColor="#color/src_text"
android:textSize="40sp"
android:visibility="#{mainViewModel.observableVisibilityPlayButton ? v.VISIBLE : v.GONE}"/>

Setting background programmatically overrides drawable

I have a ListView and I have a Drawable for each item in the ListView to highlight each row when it's selected/pressed. I also have a custom adapter where I'm programatically setting the background color of each row (I want to have alternating background colors). This is a new feature I added and before adding the code the rows would highlight blue, but after they do not highlight. Not sure how to fix it. Here is what I have:
ListView item layout
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:paddingLeft="5dip"
android:paddingRight="5dip"
android:paddingTop="8dip"
android:paddingBottom="8dip"
android:background="#drawable/app_selector"
>
<TextView
android:id="#+id/text"
style="#style/ListingTitle"
android:layout_alignParentTop="true"
android:paddingBottom="2dip"
/>
</RelativeLayout>
Drawable
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="#color/light_blue" />
<item android:state_selected="true" android:state_pressed="false" android:drawable="#color/light_blue" />
<item android:state_activated="true" android:state_selected="false" android:state_pressed="false" android:drawable="#color/light_blue" />
<item android:state_selected="false" android:state_pressed="false" android:drawable="#android:color/transparent" />
</selector>
Fragment
public class ListingFragment extends SherlockListFragment
{
public void onActivityCreated(final Bundle icicle)
{
ListView lv = getListView();
mListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);
mListView.setMultiChoiceModeListener(new MultiChoiceModeListener() {
#Override
public void onItemCheckedStateChanged(android.view.ActionMode mode, int position, long id, boolean checked) {
}
#Override
public boolean onActionItemClicked(android.view.ActionMode mode, android.view.MenuItem item) {
}
}
}
/* ADAPTER */
private class CustomAdapter extends BaseAdapter
{
#Override
public View getView(final int position, View convertView, final ViewGroup parent)
{
final ViewHolder holder;
if (convertView == null)
{
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.item, parent, false);
}
else
{
holder = (ViewHolder)convertView.getTag();
}
if (position % 2 == 0)
convertView.setBackgroundColor(Color.GRAY);
else
convertView.setBackgroundColor(Color.TRANSPARENT);
return(convertView);
}
}
}

Expanding on dum's answer, you don't need to do all that work in code.
Drawable A
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="#color/light_blue" />
<item android:state_selected="true" android:state_pressed="false" android:drawable="#color/light_blue" />
<item android:state_activated="true" android:state_selected="false" android:state_pressed="false" android:drawable="#color/light_blue" />
<item android:state_selected="false" android:state_pressed="false" android:drawable="#android:color/transparent" />
</selector>
Drawable B
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="#color/light_blue" />
<item android:state_selected="true" android:state_pressed="false" android:drawable="#color/light_blue" />
<item android:state_activated="true" android:state_selected="false" android:state_pressed="false" android:drawable="#color/light_blue" />
<item android:state_selected="false" android:state_pressed="false" android:drawable="#android:color/gray" />
</selector>
In your Adapter:
if (position % 2 == 0) {
convertView.setBackgroundResource(R.drawable.A);
} else {
convertView.setBackgroundResource(R.drawable.B);
}

instead of changing the drawable with plain color, first create a new drawable programmatically and set the states just like in your xml and then set colors for each state. then try replacing your background with your programmatically created drwable.

How to set text color as link?

I have textview which I want to change the color when I focus or cliclked it like a link text in web I have try to follow this but it still doesn't work
please help, thanks
this is my java code
public class TextColorActivity extends Activity {
/** Called when the activity is first created. */
ColorStateList cl = null;
private TextView title;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
title = (TextView)findViewById(R.id.hello);
try {
Log.d("test","try");
XmlResourceParser xpp = getResources().getXml(R.drawable.selector_txt);
cl = ColorStateList.createFromXml(getResources(), xpp);
} catch (Exception e) {}
title.setTextColor(cl);
title.setFocusable(true);
title.setClickable(true);
title.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.d("test","click");
}
});
}
this is my selector_txt.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:color="#color/Darkgoldenrod"/>
<item android:state_pressed="true" android:state_enabled="false"
android:color="#color/Darkgreen" />
<item android:state_enabled="false" android:color="#color/Red" />
<item android:color="#color/blue"/>
and this is my main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/hello"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello"
android:textSize="30dp"
android:textStyle="bold"
android:duplicateParentState="true"/>

You can also set your color in the xml if you want. Just create a color folder in your res folder and move the xml file there then you can set it via android:textColor="#color/selector_txt"
Regards the problem you're having. Android will always use the first match in a selector. If a TextView is pressed it is also focused. So add android:pressed="false" to your first item or move the line after the pressed status line.
That's the full xml:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="false" android:color="#color/Red" />
<item android:state_pressed="true" android:color="#color/Darkgreen" />
<item android:state_focused="true" android:color="#color/Darkgoldenrod"/>
<item android:color="#color/blue"/>
</selector>

How to change default images of CheckBox

I am using ListView and for every row I have row_item.xml and I inflate that in code
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<CheckBox
android:id="#+id/chk"
android:layout_alignParentLeft="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/txtChoice"
android:textColor="#FF0000"
android:text="TEST"
android:layout_toRightOf="#id/chk"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
How to change that checkBox use another custom_1 image when is checked and another custom_2 image when is unchecked ?

Drawable customdrawablecheckbox.xml:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="false" android:drawable="#drawable/unchecked_drawable" />
<item android:state_checked="true" android:drawable="#drawable/checked_drawable" />
<item android:drawable="#drawable/unchecked_drawable" /> <!-- default state -->
</selector>
yourcheckbox xml:
<CheckBox
android:id="#+id/chk"
android:button="#drawable/customdrawablecheckbox"
android:layout_alignParentLeft="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

checkbox is a button, so you can provide your own drawable with check uncheck state and it as checkbox background. For instance
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="false" android:drawable="#drawable/yourdrawable1" />
<item android:state_checked="true" android:drawable="#drawable/yourdrawable2" />
<item android:drawable="#drawable/yourdrawable1" /> <!-- default -->
</selector>
and put this in a file.xml in your drawable folder. In your checkbox:
<CheckBox
android:button="#drawable/file"
android:id="#+id/chk"
android:layout_alignParentLeft="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

Its pretty easy :)
First you need to create a CustomCheckBox class which will extend CheckBox and override the onDraw(Canvas canvas) method:
public class CustomCheckBox extends CheckBox {
private final Drawable buttonDrawable;
public CustomCheckBox(Context context, AttributeSet set) {
super(context, set);
buttonDrawable = getResources().getDrawable(R.drawable.custom_check_box);
try {
setButtonDrawable(android.R.color.transparent);
} catch (Exception e) {
// DO NOTHING
}
setPadding(10, 5, 50, 5);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
buttonDrawable.setState(getDrawableState());
final int verticalGravity = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
final int height = buttonDrawable.getIntrinsicHeight();
if (buttonDrawable != null) {
int y = 0;
switch (verticalGravity) {
case Gravity.BOTTOM:
y = getHeight() - height;
break;
case Gravity.CENTER_VERTICAL:
y = (getHeight() - height) / 2;
break;
}
int buttonWidth = buttonDrawable.getIntrinsicWidth();
int buttonLeft = getWidth() - buttonWidth - 5;
buttonDrawable.setBounds(buttonLeft, y, buttonLeft + buttonWidth, y + height);
buttonDrawable.draw(canvas);
}
}
}
Also create your selector named custom_check_box in your drawable folder:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:state_window_focused="false"
android:drawable="#drawable/btn_check_on" />
<item android:state_checked="false" android:state_window_focused="false"
android:drawable="#drawable/btn_check_off" />
<item android:state_checked="true" android:state_pressed="true"
android:drawable="#drawable/btn_check_on" />
<item android:state_checked="false" android:state_focused="true"
android:drawable="#drawable/btn_check_off" />
<item android:state_checked="false" android:drawable="#drawable/btn_check_off" />
<item android:state_checked="true" android:drawable="#drawable/btn_check_on" />
</selector>
And use your custom icons/imgs in the XML above for all three states (focused/pressed/default)
Use the custom component in your XML like this :
<*package + class path*.CustomCheckBox // example com.mypackage.ui.CustomCheckBox if your project is named "mypackage" and the class is in the "ui" folder
android:text="#string/text"
android:checked="false" android:layout_width="fill_parent"
android:id="#+id/myCheckbox" android:layout_height="wrap_content"/>
and java :
private CustomCheckBox mCheckbox;
mCheckbox = (CustomCheckBox) findviewbyid(R.id.myCheckbox);
It works because I used it both ways :) And with some tweaks it works for RadioButtons too the same way. Happy coding!

You can use selector in xml, which is used to change the image of checkbox dynamically according to its checked state.
For example:
<item android:drawable="#drawable/ic_linkedin" android:state_checked="true" />
<item android:drawable="#drawable/ic_linkedin_disabled" android:state_checked="false" />
In the following file, if the checkbox is checked, it will set the ic_linkedin icon and if the checkbox is unchecked, it will set the ic_linkedin_disabled icon.

Custom checkbox image android

Is there an easy way to use a custom image for a checkbox? I'm looking to duplicate the "starred" behavior of gmail. So I want to have a checkbox that, when checked, is a filled in star. And when unchecked is an empty star. Do I have to use an imageview and do my own logic myself?

Create a drawable checkbox selector:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="#drawable/checkbox"
android:state_checked="false"/>
<item android:drawable="#drawable/checkboxselected"
android:state_checked="true"/>
<item android:drawable="#drawable/checkbox"/>
</selector>
Make sure your checkbox is like this android:button="#drawable/checkbox_selector"
<CheckBox
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:button="#drawable/checkbox_selector"
android:text="CheckBox"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#color/Black" />

Checkboxes being children of Button you can just give your checkbox a background image with several states as described here, under "Button style":
...and exemplified here:

Copy the btn_check.xml from android-sdk/platforms/android-#/data/res/drawable to your project's drawable folder and change the 'on' and 'off' image states to your custom images.
Then your xml will just need android:button="#drawable/btn_check"
<CheckBox
android:button="#drawable/btn_check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true" />
If you want to use different default android icons, you can use android:button="#android:drawable/..."

res/drawable/day_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="#drawable/dayselectionunselected"
android:state_checked="false"/>
<item android:drawable="#drawable/daysselectionselected"
android:state_checked="true"/>
<item android:drawable="#drawable/dayselectionunselected"/>
</selector>
res/layout/my_layout.xml
<CheckBox
android:id="#+id/check"
android:layout_width="39dp"
android:layout_height="39dp"
android:background="#drawable/day_selector"
android:button="#null"
android:gravity="center"
android:text="S"
android:textColor="#color/black"
android:textSize="12sp" />

If you have Android open source code, you can find the styles definition under:
src/frameworks/base/core/res/res/values
<style name="Widget.CompoundButton.CheckBox">
<item name="android:background">
#android:drawable/btn_check_label_background
</item>
<item name="android:button">
?android:attr/listChoiceIndicatorMultiple
</item>
</style>

Based on the Enselic and Rahul answers.
It works for me (before and after API 21):
<CheckBox
android:id="#+id/checkbox"
android:layout_width="40dp"
android:layout_height="40dp"
android:text=""
android:gravity="center"
android:background="#drawable/checkbox_selector"
android:button="#null"
app:buttonCompat="#null" />

Try it -
package com;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
public class CheckBoxImageView extends ImageView implements View.OnClickListener {
boolean checked;
int defImageRes;
int checkedImageRes;
OnCheckedChangeListener onCheckedChangeListener;
public CheckBoxImageView(Context context, AttributeSet attr, int defStyle) {
super(context, attr, defStyle);
init(attr, defStyle);
}
public CheckBoxImageView(Context context, AttributeSet attr) {
super(context, attr);
init(attr, -1);
}
public CheckBoxImageView(Context context) {
super(context);
}
public boolean isChecked() {
return checked;
}
public void setChecked(boolean checked) {
this.checked = checked;
setImageResource(checked ? checkedImageRes : defImageRes);
}
private void init(AttributeSet attributeSet, int defStyle) {
TypedArray a = null;
if (defStyle != -1)
a = getContext().obtainStyledAttributes(attributeSet, R.styleable.CheckBoxImageView, defStyle, 0);
else
a = getContext().obtainStyledAttributes(attributeSet, R.styleable.CheckBoxImageView);
defImageRes = a.getResourceId(0, 0);
checkedImageRes = a.getResourceId(1, 0);
checked = a.getBoolean(2, false);
a.recycle();
setImageResource(checked ? checkedImageRes : defImageRes);
setOnClickListener(this);
}
#Override
public void onClick(View v) {
checked = !checked;
setImageResource(checked ? checkedImageRes : defImageRes);
onCheckedChangeListener.onCheckedChanged(this, checked);
}
public void setOnCheckedChangeListener(OnCheckedChangeListener onCheckedChangeListener) {
this.onCheckedChangeListener = onCheckedChangeListener;
}
public static interface OnCheckedChangeListener {
void onCheckedChanged(View buttonView, boolean isChecked);
}
}
Add this attrib -
<declare-styleable name="CheckBoxImageView">
<attr name="default_img" format="integer"/>
<attr name="checked_img" format="integer"/>
<attr name="checked" format="boolean"/>
</declare-styleable>
Use like -
<com.adonta.ziva.consumer.wrapper.CheckBoxImageView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/checkBox"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:clickable="true"
android:padding="5dp"
app:checked_img="#drawable/check_box_checked"
app:default_img="#drawable/check_box" />
It will fix all your porblems.

Another option is to use a ToggleButton with null background and a custom button.
Bellow an example that includes a selector to the text color as well.
<ToggleButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:button="#drawable/toggle_selector"
android:background="#null"
android:paddingLeft="10dp"
android:layout_centerHorizontal="true"
android:gravity="center"
android:textColor="#drawable/toggle_text"
android:textOn="My on state"
android:textOff="My off state" />
toggle_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_checked="true"
android:drawable="#drawable/state_on" />
<item
android:drawable="#drawable/state_off" />
</selector>
toggle_text.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_checked="true"
android:color="#color/app_color" />
<item
android:color="#android:color/darker_gray" />
</selector>

If you are using custom adapters than android:focusable="false" and android:focusableInTouchMode="false" are nessesury to make list items clickable while using checkbox.
<CheckBox
android:id="#+id/checkbox_fav"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:button="#drawable/checkbox_layout"/>
In drawable>checkbox_layout.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="#drawable/uncked_checkbox"
android:state_checked="false"/>
<item android:drawable="#drawable/selected_checkbox"
android:state_checked="true"/>
<item android:drawable="#drawable/uncked_checkbox"/>
</selector>

If you use androidx.appcompat:appcompat and want a custom drawable (of type selector with android:state_checked) to work on old platform versions in addition to new platform versions, you need to use
<CheckBox
app:buttonCompat="#drawable/..."
instead of
<CheckBox
android:button="#drawable/..."

Adding custom drawable in the android:button did not work for me in Material Checkbox version-1.3.0 . I had to set android:drawable="#drawable/checkbox_selector" instead and also set android:button="#null" . You can also add android:drawablePadding to make it look good. However, this makes the entire checkbox clickable (along with the text).