ListView item滑动删除

• 仿QQListView滑动删除

• 用PopupWindow实现ListView item的滑动删除,学习view事件传递机制

• 代码注释很全,这里不做详细说明

• 冰冻三尺非一日之寒,有时间就写,写写更健康

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1. 自定义ListView

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;

/**
 * Created by zhangfeng on 2016/10/24.
 */

public class DeleteListView extends ListView {
    private static final String TAG = "DeleteListView";
    /**
     * 滑动的最小距离
     */
    private int touchSolp;
    /**
     * 是否滑动
     */
    private boolean isSliding;
    /**
     * 手指按下X坐标
     */
    private int xDown;
    /**
     * 手指按下Y坐标
     */
    private int yDown;
    /**
     * 手指移动X坐标
     */
    private int xMove;
    /**
     * 手指移动Y坐标
     */
    private int yMove;
    /**
     * 当前手指触摸的view
     */
    private View mCurrentView;
    /**
     * 当前手指触摸的位置
     */
    private int mCurrentViewPos;
    
    private LayoutInflater inflater;

    private PopupWindow popupWindow;

    private int popWindowHeight;

    private int popWindowWidht;
    
    private Button deleteBtn;

    /**
     * 为删除按钮提供一个回掉接口
     */
    private DelButtonClickListener mListener;

    /**
     * 初始化
     * @param context
     * @param attrs
     */

    public DeleteListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        inflater = LayoutInflater.from(context);
        touchSolp = ViewConfiguration.get(context).getScaledTouchSlop();
        View view = inflater.inflate(R.layout.view_list_item, null);
        deleteBtn = (Button) view.findViewById(R.id.delete);
        popupWindow = new PopupWindow(view, LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

        //先调用下measure 否则拿不到宽高

        popupWindow.getContentView().measure(0, 0);
        popWindowHeight = popupWindow.getContentView().getMeasuredHeight();
        popWindowWidht = popupWindow.getContentView().getMeasuredWidth();

    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        int action = event.getAction();
        int x = (int) event.getX();
        int y = (int) event.getY();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                xDown = x;
                yDown = y;
                /**
                 * 如果当前popwindow 显示 则直接隐藏,屏蔽 touch事件的向下传递
                 */
                if (popupWindow.isShowing()) {
                    dismissPopwindow();
                    return false;
                }
                //获得当前手指按下 item的位置
                mCurrentViewPos = pointToPosition(xDown, yDown);
                //获得当前手指按下的 view
                View view = getChildAt(mCurrentViewPos - getFirstVisiblePosition());
                mCurrentView = view;
                break;
            case MotionEvent.ACTION_MOVE:
                xMove = x;
                yMove = y;
                int dx = xMove - xDown;
                int dy = yMove - yDown;
                /**
                 * 判断是否从右到左滑动
                 */
                if (xMove < xDown && Math.abs(dx) > touchSolp && Math.abs(dy) < touchSolp) {

                     Log.e(TAG, "touchslop = " + touchSolp + " , dx = " + dx +
                     " , dy = " + dy);
                    isSliding = true;
                }
                break;
        }
        return super.dispatchTouchEvent(event);
    }

    private void dismissPopwindow() {
        if (popupWindow != null && popupWindow.isShowing()) {
            popupWindow.dismiss();
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();
        /**
         * 如果从右到左才响应 movie事件
         */
        if (isSliding) {
            switch (action) {
                case MotionEvent.ACTION_MOVE:
                    int[] location = new int[2];
                    //获得当前 item 的X与Y
                    mCurrentView.getLocationOnScreen(location);
                    popupWindow.setAnimationStyle(R.style.popwindow_delete_btn_anim_style);
                    popupWindow.update();
                    popupWindow.showAtLocation(mCurrentView, Gravity.LEFT | Gravity.TOP,
                            location[0] + mCurrentView.getWidth(), location[1] + mCurrentView.getHeight() / 2 - popWindowHeight / 2);
                    deleteBtn.setOnClickListener(new OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            if (mListener != null) {
                                mListener.clickHappend(mCurrentViewPos);
                                popupWindow.dismiss();
                            }
                        }
                    });
                    break;
                case MotionEvent.ACTION_UP:
                    isSliding = false;
            }
            return true;
        }
        return super.onTouchEvent(event);
    }

    public void setDelButtonClickListener(DelButtonClickListener listener) {
        mListener = listener;
    }

    interface DelButtonClickListener {
        public void clickHappend(int posiotion);
    }
}

2. xml引用

<com.cn.test.DeleteListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:listSelector="#00000000"></com.cn.test.DeleteListView>

2. 测试

listView = (DeleteListView) findViewById(R.id.listView);
        mDatas = new ArrayList<>(Arrays.asList("Java", "Android", "Python", "Ruby", "Servlet", "Struts",
                "Hibernate", "Spring", "HTML5", "Javascript", "Jquery"));
        adapter = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1, mDatas);
        listView.setAdapter(adapter);
        listView.setDelButtonClickListener(new DeleteListView.DelButtonClickListener() {
            @Override
            public void clickHappend(int posiotion) {
                adapter.remove(adapter.getItem(posiotion));
                adapter.notifyDataSetChanged();
            }
        });

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