android-swipe-to-dismiss-undo

Library to make the items in a ListView or RecyclerView dismissable with the possibility to undo it, using your own view to provide this functionality like the Gmail app for Android does.

Add the following to your build.gradle:

repositories {
	mavenCentral()
}

dependencies {
	compile 'com.hudomju:swipe-to-dismiss-undo:1.0'
}

Or:

• [Download the latest .jar file][https://oss.sonatype.org/content/repositories/releases/com/hudomju/swipe-to-dismiss-undo/1.0/swipe-to-dismiss-undo-1.0-sources.jar]
• Add the .jar files to your project's libs folder, or add them as external jars to your project's build path.

Create a Layout

To make an item in the list dismissable, you need ot place a ViewGroup (i.e. FrameLayout) as the root view of your layout. Inside the ViewGroup, add one view that contains the main content for the row (your primary layout when the row hasn't been dismissed yet) and another view that contains the contents of the dismiss layout (i.e. with an undo button).

For example, the following layout uses a FrameLayout with two child views: a TextView to contain the main content (populated by an Adapter at runtime), and a LinearLayout for the undo layout.

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/lyt_container"
    android:background="@color/gray_background">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:height="@dimen/list_item_height"
        android:gravity="center_vertical"
        android:paddingLeft="@dimen/list_item_padding_sides"
        android:paddingRight="@dimen/list_item_padding_sides"
        android:id="@+id/txt_data"
        android:background="@android:color/white"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:visibility="gone"
        android:weightSum="3"
        android:height="@dimen/list_item_height"
        android:paddingLeft="@dimen/list_item_padding_sides"
        android:paddingRight="@dimen/list_item_padding_sides">

        <TextView
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:id="@+id/txt_delete"
            android:gravity="center_vertical"
            android:text="@string/deleted"
            android:clickable="false"
            android:layout_weight="2"
            android:hapticFeedbackEnabled="true"
            android:textColor="@android:color/white"/>

        <TextView
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:gravity="center"
            android:id="@+id/txt_undo"
            android:text="@string/undo"
            android:clickable="false"
            android:layout_weight="1"
            android:textColor="@color/yellow"/>

        </LinearLayout>

</FrameLayout>

NOTE that the second child in the layout (here the LinearLayout), must have the visibility set to GONE, or both the data and the undo layout will be displayed in the row at the same time.

Usage

With a ListView:

final SwipeToDismissTouchListener<ListViewAdapter> touchListener =
                new SwipeToDismissTouchListener<>(
                        new ListViewAdapter(listView),
                        new SwipeToDismissTouchListener.DismissCallbacks<ListViewAdapter>() {
                            @Override
                            public boolean canDismiss(int position) {
                                return true;
                            }

                            @Override
                            public void onDismiss(ListViewAdapter view, int position) {
                                adapter.remove(position);
                            }
                        });
listView.setOnTouchListener(touchListener);
listView.setOnScrollListener((AbsListView.OnScrollListener) touchListener.makeScrollListener());
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        if (touchListener.existPendingDismisses()) {
            touchListener.undoPendingDismiss();
        } else {
            Toast.makeText(ListViewActivity.this, "Position " + position, LENGTH_SHORT).show();
        }
    }
});

With a RecyclerView:

final SwipeToDismissTouchListener<RecyclerViewAdapter> touchListener =
                new SwipeToDismissTouchListener<>(
                        new RecyclerViewAdapter(recyclerView),
                        new SwipeToDismissTouchListener.DismissCallbacks<RecyclerViewAdapter>() {
                            @Override
                            public boolean canDismiss(int position) {
                                return true;
                            }

                            @Override
                            public void onDismiss(RecyclerViewAdapter view, int position) {
                                adapter.remove(position);
                            }
                        });

recyclerView.setOnTouchListener(touchListener);
recyclerView.setOnScrollListener((RecyclerView.OnScrollListener)touchListener.makeScrollListener());
recyclerView.addOnItemTouchListener(new SwipeableItemClickListener(this,
        new OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                if (view.getId() == R.id.txt_delete) {
                    touchListener.processPendingDismisses();
                } else if (view.getId() == R.id.txt_undo) {
                    touchListener.undoPendingDismiss();
                } else { // R.id.txt_data
                    Toast.makeText(context, "Position " + position, LENGTH_SHORT).show();
                }
            }
        }));

Special Thanks

Romman Nurik for the initial contribution with swipe to dismiss for ListView

See the original Google+ post for discussion.

See also Jake Wharton's port of this sample code to old versions of Android using the NineOldAndroids compatibility library.