This code snippet makes part of a string clickable.

attr.xml

    <declare-styleable name="PartClickTextView">
        <attr name="clickable_texts" format="string"/>
    </declare-styleable>

example.xml

 <xxx.xxxx.xxxx.PartClickTextView
            android:id="@+id/cant_login"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:clickable="true"
            android:focusable="true"
            android:padding="20dp"
            android:text="Can't login?"
            android:textAppearance="?android:textAppearanceSmall"
            android:textColor="@color/grey"
            android:textSize="23sp"
            app:clickable_texts="Click here" />
   

PartClickTextView.java

public class PartClickTextView extends TextView{

    public static final String TAG = PartClickTextView.class.getSimpleName();
    private OnPartTextClickListener mListener;

    public interface OnPartTextClickListener{
        void onPartTextClick(View view);
    }

    public void setOnPartTextClickListener(OnPartTextClickListener mCallback){
        this.mListener = mCallback;
    }

    public PartClickTextView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);

        turnTextToLink(context, attrs);
    }

    //Allow the user to click on part of the text
    private void turnTextToLink(final Context context, AttributeSet attr){
        TypedArray a = context.getTheme().obtainStyledAttributes(attr, R.styleable.PartClickTextView, 0, 0);
        String text = a.getString(R.styleable.PartClickTextView_clickable_texts);
        if (TextUtils.isEmpty(text))return;
        String mainText = getText().toString().concat(" "+ text);
        setClickable(true);
        SpannableString ss = new SpannableString(mainText);
        ClickableSpan clickableSpan = new ClickableSpan() {
            @Override
            public void onClick(View textView) {
                if(mListener != null) {
                    mListener.onPartTextClick(textView);
                }
                Log.d(TAG, "CLICKED");
            }
            @Override
            public void updateDrawState(TextPaint ds) {
                super.updateDrawState(ds);
                ds.setUnderlineText(false);
            }
        };
        ss.setSpan(clickableSpan, mainText.lastIndexOf(text.substring(0, 1)),
                mainText.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        setText(ss);
        setMovementMethod(LinkMovementMethod.getInstance());
        setHighlightColor(Color.TRANSPARENT);
        a.recycle();
    }
}