Android 使用SwipeActionAdapter开源库实现简单列表的左右滑动操作

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Android 使用SwipeActionAdapter开源库实现简单列表的左右滑动操作

无名公子 2016-02-28 22:10:00 浏览1851
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  我们做listview左右滑动操作时,一般中情况下,都是像QQ那样,左滑弹出操作菜单(删除、编辑),然后选择菜单操作; 这样的效果不可谓不好,算是非常经典。 另外,有少数的APP,尤其是任务管理类的APP,更加注重listview的操作交互,例如ToDoList及滴答清单,这两个APP对任务的操作是直接通过滑动列表进行操作的;效果图如下:




  gtihub上有一个开源项目,已经很好的实现了对该效果:https://github.com/wdullaer/SwipeActionAdapter ; 此处,就简单下介绍该开源项目。


1.  使用Android Studio新建项目导入该开源库:

  导入该库,可以在build.gradle中添加:

dependencies {
    compile 'com.wdullaer:swipeactionadapter:2.0.0'
}
  当然,我更建议直接把该项目的library直接导入到项目中,这样会更加方便对代码进行修改。


2.   首先,设置ListView显示:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Create an Adapter for your content
    String[] content = new String[20];
    for (int i=0;i<20;i++) content[i] = "Row "+(i+1);
    ArrayAdapter<String> stringAdapter = new ArrayAdapter<String>(
            this,
            R.layout.row_bg,
            R.id.text,
            new ArrayList<String>(Arrays.asList(content))
    );

    // Wrap your content in a SwipeActionAdapter
    mAdapter = new SwipeActionAdapter(stringAdapter);

    // Pass a reference of your ListView to the SwipeActionAdapter
    mAdapter.setListView(getListView());

    // Set the SwipeActionAdapter as the Adapter for your ListView
    setListAdapter(mAdapter);
}
  上面的代码很简单,只是比正常使用ListView多了一步:SwipeActionAdapter mAdapter = new SwipeActionAdapter(stringAdapter); 就是在普通Adapter的基础上包裹上一层SwipeActionAdapter。


3. 为ListView的Item添加滑动时的背景色

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Create an Adapter for your content
    String[] content = new String[20];
    for (int i=0;i<20;i++) content[i] = "Row "+(i+1);
    ArrayAdapter<String> stringAdapter = new ArrayAdapter<String>(
            this,
            R.layout.row_bg,
            R.id.text,
            new ArrayList<String>(Arrays.asList(content))
    );

    // Wrap your content in a SwipeActionAdapter
    mAdapter = new SwipeActionAdapter(stringAdapter);

    // Pass a reference of your ListView to the SwipeActionAdapter
    mAdapter.setListView(getListView());

    // Set the SwipeActionAdapter as the Adapter for your ListView
    setListAdapter(mAdapter);

    // Set backgrounds for the swipe directions
    mAdapter.addBackground(SwipeDirection.DIRECTION_FAR_LEFT,R.layout.row_bg_left_far)
            .addBackground(SwipeDirection.DIRECTION_NORMAL_LEFT,R.layout.row_bg_left)
            .addBackground(SwipeDirection.DIRECTION_FAR_RIGHT,R.layout.row_bg_right_far)
            .addBackground(SwipeDirection.DIRECTION_NORMAL_RIGHT,R.layout.row_bg_right);
}

  上述代码最后,既是添加背景的代码,代码很明了,在为不同的滑动过程,添加不同的背景,该背景其实就是一个布局,例如row_bg_left_far.xml文件:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="?android:listPreferredItemHeight"
    android:background="@android:color/holo_blue_bright">
</LinearLayout>


  此处,可以查看下SwipeDirection.java类源码:

public enum SwipeDirection {
    // Constants
    DIRECTION_NORMAL_LEFT,
    DIRECTION_FAR_LEFT,
    DIRECTION_NORMAL_RIGHT,
    DIRECTION_FAR_RIGHT,
    DIRECTION_NEUTRAL;

    @NonNull
    public static List<SwipeDirection> getAllDirections(){
        return Arrays.asList(
                DIRECTION_FAR_LEFT,
                DIRECTION_FAR_RIGHT,
                DIRECTION_NEUTRAL,
                DIRECTION_NORMAL_LEFT,
                DIRECTION_NORMAL_RIGHT
        );
    }

    public boolean isLeft() {
        return this.equals(DIRECTION_NORMAL_LEFT) || this.equals(DIRECTION_FAR_LEFT);
    }

    public boolean isRight() {
        return this.equals(DIRECTION_NORMAL_RIGHT) || this.equals(DIRECTION_FAR_RIGHT);
    }
}

  我们可以看出,主要的操作有四个: DIRECTION_NORMAL_LEFT(左滑一小段距离),DIRECTION_FAR_LEFT(左滑较长距离), DIRECTION_NORMAL_RIGHT(右滑一小段距离),DIRECTION_FAR_RIGHT(右滑较长距离)。 


4.  添加ListView左右滑动监听:

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Create an Adapter for your content
    String[] content = new String[20];
    for (int i=0;i<20;i++) content[i] = "Row "+(i+1);
    ArrayAdapter<String> stringAdapter = new ArrayAdapter<String>(
            this,
            R.layout.row_bg,
            R.id.text,
            new ArrayList<String>(Arrays.asList(content))
    );

    // Wrap your content in a SwipeActionAdapter
    mAdapter = new SwipeActionAdapter(stringAdapter);

    // Pass a reference of your ListView to the SwipeActionAdapter
    mAdapter.setListView(getListView());

    // Set the SwipeActionAdapter as the Adapter for your ListView
    setListAdapter(mAdapter);

    // Set backgrounds for the swipe directions
    mAdapter.addBackground(SwipeDirection.DIRECTION_FAR_LEFT,R.layout.row_bg_left_far)
            .addBackground(SwipeDirection.DIRECTION_NORMAL_LEFT,R.layout.row_bg_left)
            .addBackground(SwipeDirection.DIRECTION_FAR_RIGHT,R.layout.row_bg_right_far)
            .addBackground(SwipeDirection.DIRECTION_NORMAL_RIGHT,R.layout.row_bg_right);

    // Listen to swipes
    mAdapter.setSwipeActionListener(new SwipeActionListener(){
        @Override
        public boolean hasActions(int position, SwipeDirection direction){
            if(direction.isLeft()) return true; // Change this to false to disable left swipes
            if(direction.isRight()) return true;
            return false;
        }

        @Override
        public boolean shouldDismiss(int position, SwipeDirection direction){
            // Only dismiss an item when swiping normal left
            return direction == SwipeDirection.DIRECTION_NORMAL_LEFT;
        }

        @Override
        public void onSwipe(int[] positionList, SwipeDirection[] directionList){
            for(int i=0;i<positionList.length;i++) {
                int direction = directionList[i];
                int position = positionList[i];
                String dir = "";

                switch (direction) {
                    case SwipeDirection.DIRECTION_FAR_LEFT:
                        dir = "Far left";
                        break;
                    case SwipeDirection.DIRECTION_NORMAL_LEFT:
                        dir = "Left";
                        break;
                    case SwipeDirection.DIRECTION_FAR_RIGHT:
                        dir = "Far right";
                        break;
                    case SwipeDirection.DIRECTION_NORMAL_RIGHT:
                        AlertDialog.Builder builder = new AlertDialog.Builder(this);
                        builder.setTitle("Test Dialog").setMessage("You swiped right").create().show();
                        dir = "Right";
                        break;
                }
                Toast.makeText(
                        this,
                        dir + " swipe Action triggered on " + mAdapter.getItem(position),
                        Toast.LENGTH_SHORT
                ).show();
                mAdapter.notifyDataSetChanged();
            }
        }
    });
}

·  public boolean hasActions(int position, SwipeDirection direction) : 该方法主要判断滑动方向:左滑还是右滑。

·  public boolean shouldDismiss(int position, SwipeDirection direction):该方法主要判断list item滑动后是否有消失的动画。

·  public void onSwipe(int[] positionList, SwipeDirection[] directionList): 主要在该方法中处理滑动逻辑。



  以上,就是SwipeActionAdapter的基本使用方式,相信善用该库,一定会给APP增添几分色彩,提高用户体验!


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