Dynamically create Choice Chip in android

Question

I am using Material Components for creating the Choice chip. I have followed https://material.io/develop/android/components/chip/ document. There is enough stuff for creating a chip in XML but not get an idea of how to create choice chip programmatically.

I have used following code to creating chip dynamically but it creates action chip by default.

val chip = Chip(activity)
chip.text = ("Chip 1")
chipGpRow.addView(chip)

Solution 1

Check the Mike comment.

Otherwise you can define a simple layout (layout_chip_choice.xml) with the Chip and the style:

<com.google.android.material.chip.Chip
    xmlns:android="http://schemas.android.com/apk/res/android"
    style="@style/Widget.MaterialComponents.Chip.Choice"
    .../>

Then use in your code:

val chip = inflater.inflate(R.layout.layout_chip_choice, chipGpRow, false) as Chip  
chip.text = ("Chip 1")
chipGpRow.addView(chip)

Solution 2

following is my code, hope its useful to you :

create item xml for chips and add style that you want like here style="@style/Widget.MaterialComponents.Chip.Choice"

item_chip_category.xml

<com.google.android.material.chip.Chip xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="@font/popin"
android:gravity="center"
android:paddingLeft="8dp"
android:paddingRight="8dp"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:textAppearance="?android:attr/textAppearance"
android:textColor="@color/secondaryTextColor"
app:chipBackgroundColor="@color/colorAccent" />

activity.xml

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:fontFamily="@font/popin"
            android:padding="8dp"
            android:text="Python Progrgrams"
            android:textAlignment="center"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            android:textColor="@color/secondaryTextColor"
            android:textStyle="bold" />

            <com.google.android.material.chip.ChipGroup
                android:id="@+id/chipsPrograms"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="@dimen/text_margin"
                android:paddingStart="@dimen/text_margin"
                android:paddingEnd="@dimen/text_margin"
                app:chipSpacing="8dp"
                app:singleSelection="false">

            </com.google.android.material.chip.ChipGroup>

    </LinearLayout>

Activity.java

 public void setCategoryChips(ArrayList<String> categorys) {
    for (String category :
            categorys) {
        Chip mChip = (Chip) this.getLayoutInflater().inflate(R.layout.item_chip_category, null, false);
        mChip.setText(category);
        int paddingDp = (int) TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, 10,
                getResources().getDisplayMetrics()
        );
        mChip.setPadding(paddingDp, 0, paddingDp, 0);
        mChip.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

            }
        });
        chipsPrograms.addView(mChip);
    }
}

Solution 3

You could either 1) create an xml layout for a chip that has the choice style and inflate it in code, similar to the ChipGroupDemoFragment example in the catalog: github.com/material-components/material-components-android/blob/… 2) create a custom theme that sets the default chipStyle to be @style/Widget.MaterialComponents.Chip.Choice I recommend #1 because it allows you the flexibility of dynamically creating chips of multiple styles.

Comments

[Zun]

I really like this answer as I didn't know you could programatically create individual views like this. I was just wondering, which inflater should I use if I want to create my Chip dynamically, somewhere away from the onCreateView?

[Gabriele Mariotti]

You can use getLayoutInflater() in your Activity or Fragment.

[GoozMeister]

Is there a way to do this in an Adapter instead of an Activity?