高仿微信对话列表滑动删除效果

Posted jzssuanfa

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前言

用过微信的都知道。微信对话列表滑动删除效果是非常不错的,这个效果我们也能够有。

思路事实上非常easy,弄个ListView。然后里面的每一个item做成一个能够滑动的自己定义控件就可以。由于ListView是上下滑动而item是左右滑动,因此会有滑动冲突。或许你须要了解下android中点击事件的派发流程,请參考Android源代码分析-点击事件派发机制。我的解决思路是这种:重写ListView的onInterceptTouchEvent方法,在move的时候做推断,假设是左右滑动就返回false。否则返回true;重写SlideView(即自己定义item控件)的onTouchEvent方法来处理滑动。

整个思路没有问题。滑动冲突也攻克了,但是ListView无法得到焦点了,也就是ListView无法处理点击事件了。让我们回忆下问题出在哪里:我的理解是这种。上述处理滑动本身没有问题,但是有一个副作用。就是会让外层View失去焦点且无法处理点击事件。

常见的滑动冲突场景。比方launcher内部嵌入ListView却是没有问题的,由于这个时候launcher不须要获得焦点,须要获得焦点的是内部的ListView。

因此,上述处理方式对于外部须要获得焦点的情况(比方外部是ListView)就不太适合了。于是我就和ttdevs探讨,发现他採用了第二种思路。我从来没有想过还能够这样玩。以下介绍他的思路。

新的思路

不考虑那么复杂,不採用主流玩法,全部的事件均由外层的ListView做拦截,同一时候把事件传递给SlideView做滑动,这样的实现的确能够达到效果,并且代码非常easy,根本不须要处理什么复杂的滑动冲突。

 

效果

以下分别为微信和高仿效果

技术分享

 

代码分析

先看SlideView是怎样实现的

看layout xml:

<com.macc.firstsecretary_UI.ListViewCompat
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#fff4f7f9"
        android:cacheColorHint="#00000000"
        android:divider="#dddbdb"
        android:dividerHeight="1.0px"
        android:drawSelectorOnTop="false"
        android:listSelector="@android:color/transparent"
        android:scrollbars="none" />


再看com.macc.firstsecretary_UI.ListViewCompat类的代码:

private static final String TAG = "ListViewCompat";

    private SlideView mFocusedItemView;

    public ListViewCompat(Context context) {
        super(context);
    }

    public ListViewCompat(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

    public void shrinkListItem(int position) {
        View item = getChildAt(position);

        if (item != null) {
            try {
                ((SlideView) item).shrink();
            } catch (ClassCastException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            int x = (int) event.getX();
            int y = (int) event.getY();
            int position = pointToPosition(x, y);
            Log.e(TAG, "postion=" + position);
            if (position != INVALID_POSITION) {
                Message data = (Message) getItemAtPosition(position);
                mFocusedItemView = data.getSlideView();
                Log.e(TAG, "FocusedItemView=" + mFocusedItemView);
            }
        }
        default:
            break;
        }

        if (mFocusedItemView != null) {
            mFocusedItemView.onRequireTouchEvent(event);
        }

        return true;
    }


再看SlideView.java:

public class SlideView extends LinearLayout {

    private static final String TAG = "SlideView";

    private Context mContext;
    private LinearLayout mViewContent;
    private RelativeLayout mHolder;
    private Scroller mScroller;
    private OnSlideListener mOnSlideListener;

    private int mHolderWidth = 120;

    private int mLastX = 0;
    private int mLastY = 0;
    private static final int TAN = 2;

    private  boolean isScroller=false;//是否已经滑动
    public interface OnSlideListener {
        public static final int SLIDE_STATUS_OFF = 0;
        public static final int SLIDE_STATUS_START_SCROLL = 1;
        public static final int SLIDE_STATUS_ON = 2;

        /**
         * @param view current SlideView
         * @param status SLIDE_STATUS_ON or SLIDE_STATUS_OFF
         */
        public void onSlide(View view, int status);
    }

    public SlideView(Context context) {
        super(context);
        initView();
    }

    public SlideView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView();
    }

    private void initView() {
        mContext = getContext();
        mScroller = new Scroller(mContext);

        setOrientation(LinearLayout.HORIZONTAL);
        View.inflate(mContext, R.layout.slide_view_merge, this);
        mViewContent = (LinearLayout) findViewById(R.id.view_content);
        mHolderWidth = Math.round(TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, mHolderWidth, getResources()
                        .getDisplayMetrics()));
    }

    public void setButtonText(CharSequence text) {
        ((TextView)findViewById(R.id.delete)).setText(text);
    }

    public void setContentView(View view) {
        mViewContent.addView(view);
    }

    public void setOnSlideListener(OnSlideListener onSlideListener) {
        mOnSlideListener = onSlideListener;
    }

    public void shrink() {
        if (getScrollX() != 0) {
            this.smoothScrollTo(0, 0);
        }
    }

    public void onRequireTouchEvent(MotionEvent event) {
        int x = (int) event.getX();
        int y = (int) event.getY();
        int scrollX = getScrollX();
        Log.d(TAG, "x=" + x + "  y=" + y);

        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
            if (!mScroller.isFinished()) {
                mScroller.abortAnimation();
            }
            if (mOnSlideListener != null) {
                mOnSlideListener.onSlide(this,
                        OnSlideListener.SLIDE_STATUS_START_SCROLL);
            }
            break;
        }
        case MotionEvent.ACTION_MOVE: {
            int deltaX = x - mLastX;
            int deltaY = y - mLastY;
            if (Math.abs(deltaX) < Math.abs(deltaY) * TAN) {
                break;
            }

            int newScrollX = scrollX - deltaX;
            if (deltaX != 0) {
            	if(isScroller){
                	this.shrink();
            	}else{
	                if (newScrollX < 0) {
	                    newScrollX = 0;
	                } else if (newScrollX > mHolderWidth) {
	                    newScrollX = mHolderWidth;
	                }
	                this.scrollTo(newScrollX, 0);
            	}
            }
            break;
        }
        case MotionEvent.ACTION_UP: {
            int newScrollX = 0;
            if (scrollX - mHolderWidth * 0.75 > 0) {
                newScrollX = mHolderWidth;
            }
            if(isScroller){
            	this.shrink();
            	isScroller=false;
            }else{
	            this.smoothScrollTo(newScrollX, 0);
	            if (mOnSlideListener != null) {
	                mOnSlideListener.onSlide(this,
	                        newScrollX == 0 ?

OnSlideListener.SLIDE_STATUS_OFF : OnSlideListener.SLIDE_STATUS_ON); } isScroller=true; } break; } default: break; } mLastX = x; mLastY = y; } private void smoothScrollTo(int destX, int destY) { // 缓慢滚动到指定位置 int scrollX = getScrollX(); int delta = destX - scrollX; mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3); invalidate(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } }



上述代码做了非常具体的说明,这就是滑动控件的完整代码,大家要明确的是:你所加入的view都是加在SlideView的子View : view_content中的,而不是直接加在SlideView中,仅仅有这样我们才方便做滑动效果。

 

 

最后一步我们来看看适配器里面的代码:

public class Carpa_MySelf_MessageCenterAdapter extends BaseAdapter implements OnSlideListener,OnClickListener{

	private LayoutInflater inflater;
	private List<Message> messages;
	private Context context;
	private SlideView mSlideView;
	private int position;//删除位置数据
	private Handler handler;
	public Carpa_MySelf_MessageCenterAdapter(Context context,ArrayList<Message> messages,Handler handler){
		setData(messages);
		this.context=context;
		inflater=LayoutInflater.from(context);
		this.handler=handler;
	}
	public void setData(ArrayList<Message> messages){
		if(messages==null){
			this.messages=new ArrayList<Message>();
		}else{
			this.messages=messages;
		}
	}
	public void setPosition(int position){
		this.position=position;
	}
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return messages.size();
	}

	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return messages.get(position);
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		 ViewHolder holder;
         SlideView slideView = (SlideView) convertView;
         if (slideView == null) {
             View itemView = inflater.inflate(R.layout.carpa_myself_message_center_item, null);

             slideView = new SlideView(context);
             slideView.setContentView(itemView);

             holder = new ViewHolder(slideView);
             slideView.setOnSlideListener(Carpa_MySelf_MessageCenterAdapter.this);
             slideView.setTag(holder);
         } else {
             holder = (ViewHolder) slideView.getTag();
         }
         Message msgMessage=messages.get(position);
         msgMessage.setSlideView(slideView);
         msgMessage.getSlideView().shrink();
         String sourceString=msgMessage.getSourceStr();
         holder.tvContent.setText("内容:"+msgMessage.getContentStr());
         holder.tvTime.setText(UtilTools.fromatDate(msgMessage.getTimeStr()));
         holder.deleteHolder.setOnClickListener(Carpa_MySelf_MessageCenterAdapter.this);
         if(sourceString.equals("Traffic")){
        	 holder.tvSource.setText("信息来源:66");
        	 holder.iView.setBackgroundResource(R.drawable.carpa_wz);
         }else if(sourceString.equals("DaiJia")){
        	 holder.tvSource.setText("信息来源:99");
        	 holder.iView.setBackgroundResource(R.drawable.car_deldrive);
         }else if(sourceString.equals("Nianjian")){
        	 holder.tvSource.setText("信息来源:33");
        	 holder.iView.setBackgroundResource(R.drawable.car_yearcheck);
         }else if(sourceString.equals("JiaSZ")){
        	 holder.tvSource.setText("信息来源:88");
        	 holder.iView.setBackgroundResource(R.drawable.car_zjbl);
         }else if(sourceString.equals("HKJiaSZ")){
        	 holder.tvSource.setText("信息来源:11");
        	 holder.iView.setBackgroundResource(R.drawable.car_hongkong);
         }
         return slideView;
	}
	class ViewHolder {
		public ImageView iView;
        public TextView tvSource;
        public TextView tvTime;
        public TextView tvContent;
        public ViewGroup deleteHolder;

        ViewHolder(View view) {
        	iView=(ImageView)view.findViewById(R.id.message_center_iv);
        	tvSource = (TextView) view.findViewById(R.id.message_center_source);
        	tvTime = (TextView) view.findViewById(R.id.message_center_time);
        	tvContent = (TextView) view.findViewById(R.id.message_center_content);
            deleteHolder = (ViewGroup)view.findViewById(R.id.holder);
        }
    }
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
        if (v.getId() == R.id.holder) {
            Log.e("info", "onClick v=" + v);
//            messages.remove(position);
//            this.notifyDataSetChanged();
            handler.sendEmptyMessage(Tab_MySelf_MessageCenter.HANDLER_DELETE);
        }
	}
	@Override
	public void onSlide(View view, int status) {
		// TODO Auto-generated method stub
        if (mSlideView != null && mSlideView != view) {
        	mSlideView.shrink();
        }

        if (status == SLIDE_STATUS_ON) {
        	mSlideView = (SlideView) view;
        }
	}


代码已贴完成!

仅供參考,谢谢!

 

 






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