listview侧滑删除

自定义Listview,向左滑动，右边刚好显示删除按钮：

public class SlideListView extends ListView {
    private int mScreenWidth; // 屏幕宽度
    private int mDownX; // 按下点的x值
    private int mDownY; // 按下点的y值
    private int mDeleteBtnWidth;// 删除按钮的宽度

    private boolean isDeleteShown; // 删除按钮是否正在显示

    private ViewGroup mPointChild; // 当前处理的item
    private LinearLayout.LayoutParams mLayoutParams; // 当前处理的item的LayoutParams

    public SlideListView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SlideListView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        // 获取屏幕宽度
        WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics dm = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(dm);
        mScreenWidth = dm.widthPixels;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                performActionDown(ev);
                break;
            case MotionEvent.ACTION_MOVE:
                return performActionMove(ev);
            case MotionEvent.ACTION_UP:
                performActionUp();
                break;
        }

        return super.onTouchEvent(ev);
    }

    // 处理action_down事件
    private void performActionDown(MotionEvent ev) {
        if (isDeleteShown) {
            turnToNormal();
        }

        mDownX = (int) ev.getX();
        mDownY = (int) ev.getY();
        // 获取当前点的item
        mPointChild = (ViewGroup) getChildAt(pointToPosition(mDownX, mDownY)
                - getFirstVisiblePosition());
        // 获取删除按钮的宽度
        mDeleteBtnWidth = mPointChild.getChildAt(1).getLayoutParams().width;
        mLayoutParams = (LinearLayout.LayoutParams) mPointChild.getChildAt(0)
                .getLayoutParams();
        mLayoutParams.width = mScreenWidth;
        mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
    }

    // 处理action_move事件
    private boolean performActionMove(MotionEvent ev) {
        int nowX = (int) ev.getX();
        int nowY = (int) ev.getY();
        if (Math.abs(nowX - mDownX) > Math.abs(nowY - mDownY)) {
            // 如果向左滑动
            if (nowX < mDownX) {
                // 计算要偏移的距离
                int scroll = (nowX - mDownX) / 2;
                // 如果大于了删除按钮的宽度， 则最大为删除按钮的宽度
                if (-scroll >= mDeleteBtnWidth) {
                    scroll = -mDeleteBtnWidth;
                }
                // 重新设置leftMargin
                mLayoutParams.leftMargin = scroll;
//                mLayoutParams.leftMargin = scroll*2;
                mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
            }
//            return true;
        }
        return super.onTouchEvent(ev);
    }

    // 处理action_up事件
    private void performActionUp() {
        // 偏移量大于button的一半，则显示button
        // 否则恢复默认
        if (-mLayoutParams.leftMargin >= mDeleteBtnWidth / 2) {
            mLayoutParams.leftMargin = -mDeleteBtnWidth;
//            mLayoutParams.leftMargin = -mDeleteBtnWidth * 2;
            isDeleteShown = true;
        } else {
            turnToNormal();
        }

        mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
    }

    /**
     * 变为正常状态
     */
    public void turnToNormal() {
        mLayoutParams.leftMargin = 0;
        mPointChild.getChildAt(0).setLayoutParams(mLayoutParams);
        isDeleteShown = false;
    }

    /**
     * 当前是否可点击
     *
     * @return 是否可点击
     */
    public boolean canClick() {
        return !isDeleteShown;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {//与scrollview嵌套需要重新计算高度
        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
                MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, expandSpec);
    }
}


适配器：

public class ListViewSlideAdapter extends BaseAdapter {

    private ArrayList<String> bulbList;
    private Activity context;
    private OnClickListenerEditOrDelete onClickListenerEditOrDelete;

    public ListViewSlideAdapter(Activity context, ArrayList<String> bulbList) {

        this.bulbList = bulbList;
        this.context = context;
    }

    public void setmNews(ArrayList<String> mNews) {
        this.bulbList = mNews;
    }

    @Override
    public int getCount() {
        return bulbList.size();
    }

    @Override
    public Object getItem(int position) {
        return bulbList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final String str = bulbList.get(position);
        ViewHolder viewHolder;
        if (null == convertView) {
            convertView = context.getLayoutInflater().inflate(R.layout.lay_list_collection_item, null);
            viewHolder = new ViewHolder(convertView);
            convertView.setTag(viewHolder);//store up viewHolder
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.tvDelete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (onClickListenerEditOrDelete != null) {
                    onClickListenerEditOrDelete.OnClickListenerDelete(position);
                }
            }
        });
       
       
        if (!TextUtils.isEmpty(str.)) {
            viewHolder.mTv.setText("" + str);
        }
        


        return convertView;
    }

    public void setOnClickListenerEditOrDelete(OnClickListenerEditOrDelete onClickListenerEditOrDelete1) {
        this.onClickListenerEditOrDelete = onClickListenerEditOrDelete1;
    }

    public interface OnClickListenerEditOrDelete {
        void OnClickListenerDelete(int position);
    }

    private class ViewHolder {
       
        TextView mTv;
        
        TextView tvDelete;

        ViewHolder(View view) {
           
            mTv = (TextView) view.findViewById(R.id.tv_title);
          
            tvDelete = (TextView) view.findViewById(R.id.tv_delete);
        }
    }

}


Item布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="horizontal">


    

            
            <TextView
                android:id="@+id/tv_title"
                android:layout_width="match_parent"
                android:layout_height="match_parent"

                android:layout_weight="1"
                android:maxLength="@integer/maxlength"
                
                android:textColor="@color/black"
                android:textSize="@dimen/text_16" />

            

    <TextView
        android:id="@+id/tv_delete"
        android:layout_width="60dp"
        android:layout_height="match_parent"
        android:layout_marginLeft="@dimen/panding_5"
        android:background="@color/color_26"
        android:gravity="center"
        android:text="删除"
        android:textColor="@color/text_f7"
        android:textSize="@dimen/text_16" />


</LinearLayout>



布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:background="@color/color_f4"
    android:orientation="vertical">

    
    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/margin_1"
        android:background="@color/color_line_ae" />

    <...PullToRefreshScrollView
        android:id="@+id/pull_refresh_scrollview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        app:ptrAnimationStyle="flip"
        app:ptrMode="both">


        <...SlideListView
            android:id="@+id/listview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="@dimen/panding_5"
            android:layout_marginRight="@dimen/panding_5"
            android:divider="@null"
            android:dividerHeight="0dp" />

    </...PullToRefreshScrollView>

    <TextView
        android:id="@+id/tv_notic"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center_horizontal"
        android:paddingTop="20dp"
        android:text="暂无收藏"
        android:visibility="gone" />

例子：

 mListCollectionAdapter = new ListViewSlideAdapter(this, mMessageReceive);
        mListView.setAdapter(mListCollectionAdapter);

        mListView.setOnItemClickListener(this);
        mListCollectionAdapter.setOnClickListenerEditOrDelete(new ListViewSlideAdapter.OnClickListenerEditOrDelete() {
            @Override
            public void OnClickListenerDelete(int position) {
               //删除按钮点击事件
            }
        });