mikepenz mikepenz - 3 months ago 42
Android Question

Touch feedback with RecyclerView and CardView

I would love to enable touch feedback for my Open-Source library.

I've created a

RecyclerView
and a
CardView
. The
CardView
contains different areas with different
onClick
actions. Now I would love to trigger the Ripple effect if a user clicks anywhere in the card, but I'm not able to achieve this behavior.

This is my listitem,
You can find it on GitHub too: https://github.com/mikepenz/AboutLibraries/blob/master/library/src/main/res/layout/listitem_opensource.xml




<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:background="@drawable/button_rect_normal"/>

<LinearLayout
android:padding="6dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<LinearLayout
android:gravity="center_vertical"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView
android:id="@+id/libraryName"
android:textColor="@color/title_openSource"
android:textSize="@dimen/textSizeLarge_openSource"
android:textStyle="normal"
android:layout_width="0dp"
android:layout_weight="5"
android:layout_height="wrap_content"
android:ellipsize="end"
android:maxLines="1"/>

<TextView
android:id="@+id/libraryCreator"
android:textColor="@color/text_openSource"
android:textStyle="normal"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:gravity="right"
android:maxLines="2"
android:textSize="@dimen/textSizeSmall_openSource"/>
</LinearLayout>

<View
android:layout_width="match_parent"
android:layout_height="1px"
android:layout_marginTop="4dp"
android:background="@color/dividerLight_openSource"/>

<TextView
android:id="@+id/libraryDescription"
android:textSize="@dimen/textSizeSmall_openSource"
android:textStyle="normal"
android:textColor="@color/text_openSource"
android:padding="8dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="20">
</TextView>

<View
android:id="@+id/libraryBottomDivider"
android:layout_width="match_parent"
android:layout_height="1px"
android:layout_marginTop="4dp"
android:background="@color/dividerLight_openSource"/>

<LinearLayout
android:id="@+id/libraryBottomContainer"
android:gravity="center_vertical"
android:paddingLeft="8dp"
android:paddingTop="4dp"
android:paddingRight="8dp"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<TextView
android:id="@+id/libraryVersion"
android:textColor="@color/text_openSource"
android:textStyle="normal"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:gravity="left"
android:maxLines="1"
android:textSize="@dimen/textSizeSmall_openSource"/>

<TextView
android:id="@+id/libraryLicense"
android:textColor="@color/text_openSource"
android:textStyle="normal"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:gravity="right"
android:maxLines="1"
android:textSize="@dimen/textSizeSmall_openSource"/>
</LinearLayout>
</LinearLayout>




And the
onClick
is set on 3 parts of this layout.
libraryCreator
,
libraryDescription
, and
libraryBottomContainer
.

I hope someone got an idea what is going wrong here.

Thanks for your help.

Answer

I was now able to solve the issue.

The problem is that i use onClickListener on the TextViews and this click listener prevents the RippleForeground from being notified about the touch event. So the solution is to implement an TouchListener on those TextViews and pass through the touch event.

The class is really simple, and can be used everywhere:

package com.mikepenz.aboutlibraries.util;

import android.support.v7.widget.CardView;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by mikepenz on 16.04.15.
 */
public class RippleForegroundListener implements View.OnTouchListener {
    CardView cardView;

    public RippleForegroundListener setCardView(CardView cardView) {
        this.cardView = cardView;
        return this;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        // Convert to card view coordinates. Assumes the host view is
        // a direct child and the card view is not scrollable.
        float x = event.getX() + v.getLeft();
        float y = event.getY() + v.getTop();

        if (android.os.Build.VERSION.SDK_INT >= 21) {
            // Simulate motion on the card view.
            cardView.drawableHotspotChanged(x, y);
        }

        // Simulate pressed state on the card view.
        switch (event.getActionMasked()) {
            case MotionEvent.ACTION_DOWN:
                cardView.setPressed(true);
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                cardView.setPressed(false);
                break;
        }

        // Pass all events through to the host view.
        return false;
    }
}

It can be used by adding this as TouchListener:

RippleForegroundListener rippleForegroundListener = new RippleForegroundListener();
older.libraryCreator.setOnTouchListener(rippleForegroundListener);

This listener will just pass through the touch event to the CardView and trigger the correct Ripple effect. (You can also modify this to take any view. It should not be limited to a CardView)

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