android 仿QQ微信側滑刪除

原創 mr丶yang 2018-08-22 10:11

                最近由於項目需求，需要做一個listview中的item策劃刪除的效果，與是查找資料和參考了一些相關的博客，終於完美實現了策劃刪除的效果。

          先看一下效果圖（研究了半天竟然沒研究出來真機上gif圖怎麼做，大家將就看一下吧）。

        

            側滑效果圖

         

      點擊刪除後的截圖

   

   點擊刪除後，listview中的第一個“微信團隊”被刪除。

   接下來看代碼部分，很多註釋都在代碼中，直接上代碼。

   首先自定義個SlideView繼承LinearLayout。

<span style="color:#009900;">import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Scroller;
import android.widget.TextView;

/** 
 * SlideView 繼承自LinearLayout 
 */  
public class SlideView extends LinearLayout {  
  
    private static final String TAG = "SlideView";  
  
    private Context mContext;  
  
    // 用來放置所有view的容器  
    private LinearLayout mViewContent;  
  
    // 用來放置內置view的容器，比如刪除 按鈕  
    private RelativeLayout mHolder;  
  
    // 彈性滑動對象，提供彈性滑動效果  
    private Scroller mScroller;  
  
    // 滑動回調接口，用來向上層通知滑動事件  
    private OnSlideListener mOnSlideListener;  
  
    // 內置容器的寬度 單位：dp  
    private int mHolderWidth = 120;  
  
    // 分別記錄上次滑動的座標  
    private int mLastX = 0;  
    private int mLastY = 0;  
  
    // 用來控制滑動角度，僅當角度a滿足如下條件才進行滑動：tan a = deltaX / deltaY > 2  
    private static final int TAN = 2;  
  
    public interface OnSlideListener {  
        // SlideView的三種狀態：開始滑動，打開，關閉  
        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;  
  
        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();  
        // 初始化彈性滑動對象  
        mScroller = new Scroller(mContext);  
        // 設置其方向爲橫向  
        setOrientation(LinearLayout.HORIZONTAL);  
        // 將slide_view_merge加載進來  
        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()));  
    }  
  
    // 設置按鈕的內容，也可以設置圖標啥的，我沒寫  
    public void setButtonText(CharSequence text) {  
        ((TextView) findViewById(R.id.delete)).setText(text);  
    }  
  
    // 將view加入到ViewContent中  
    public void setContentView(View view) {  
        mViewContent.addView(view);  
    }  
  
    // 設置滑動回調  
    public void setOnSlideListener(OnSlideListener onSlideListener) {  
        mOnSlideListener = onSlideListener;  
    }  
  
    // 將當前狀態置爲關閉  
    public void shrink() {  
        if (getScrollX() != 0) {  
            this.smoothScrollTo(0, 0);  
        }  
    }  
  
    // 根據MotionEvent來進行滑動，這個方法的作用相當於onTouchEvent  
    // 如果你不需要處理滑動衝突，可以直接重命名，照樣能正常工作  
    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) {  
                // 滑動不滿足條件，不做橫向滑動  
                break;  
            }  
  
            // 計算滑動終點是否合法，防止滑動越界  
            int newScrollX = scrollX - deltaX;  
            if (deltaX != 0) {  
                if (newScrollX < 0) {  
                    newScrollX = 0;  
                } else if (newScrollX > mHolderWidth) {  
                    newScrollX = mHolderWidth;  
                }  
                this.scrollTo(newScrollX, 0);  
            }  
            break;  
        }  
        case MotionEvent.ACTION_UP: {  
            int newScrollX = 0;  
            // 這裏做了下判斷，當鬆開手的時候，會自動向兩邊滑動，具體向哪邊滑，要看當前所處的位置  
            if (scrollX - mHolderWidth * 0.75 > 0) {  
                newScrollX = mHolderWidth;  
            }  
            // 慢慢滑向終點  
            this.smoothScrollTo(newScrollX, 0);  
            // 通知上層滑動事件  
            if (mOnSlideListener != null) {  
                mOnSlideListener.onSlide(this,  
                        newScrollX == 0 ? OnSlideListener.SLIDE_STATUS_OFF  
                                : OnSlideListener.SLIDE_STATUS_ON);  
            }  
            break;  
        }  
        default:  
            break;  
        }  
  
        mLastX = x;  
        mLastY = y;  
    }  
  
    private void smoothScrollTo(int destX, int destY) {  
        // 緩慢滾動到指定位置  
        int scrollX = getScrollX();  
        int delta = destX - scrollX;  
        // 以三倍時長滑向destX，效果就是慢慢滑動  
        mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3);  
        invalidate();  
    }  
  
    @Override  
    public void computeScroll() {  
        if (mScroller.computeScrollOffset()) {  
            scrollTo(mScroller.getCurrX(), mScroller.getCurrY());  
            postInvalidate();  
        }  
    }  
  
}  </span>

    自定義SlideView所關聯的xml.(主要就是佈局側滑顯出來的刪除按鈕) 

<span style="color:#009900;"><?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/view_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" >
    </LinearLayout>

    <RelativeLayout
        android:id="@+id/holder"
        android:layout_width="120dp"
        android:layout_height="match_parent"
        android:clickable="true"
        android:background="@drawable/holder_bg">

        <TextView
            android:id="@+id/delete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableLeft="@drawable/del_icon_normal"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:textColor="@color/floralwhite"
            android:text="刪除" />
    </RelativeLayout>

</merge></span>

自定義ListViewCompat繼承Listview。 

<span style="color:#009900;">import com.ryg.slideview.MainActivity.MessageItem;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ListView;

public class ListViewCompat extends ListView {

    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();  
            //根據座標獲取item所在的行 
            int position = pointToPosition(x, y);  
            Log.e(TAG, "postion=" + position);  
            if (position != INVALID_POSITION) {  
                //得到當前點擊行的數據從而取出當前行的item。  
                //可能有人懷疑，爲什麼要這麼幹？爲什麼不用getChildAt(position)？  
                //因爲ListView會進行緩存，如果你不這麼幹，有些行的view你是得不到的。  
                MessageItem data = (MessageItem) getItemAtPosition(position);  
                mFocusedItemView = data.slideView;  
                Log.e(TAG, "FocusedItemView=" + mFocusedItemView);  
            }  
        }  
        default:  
            break;  
        }  
      
        //向當前點擊的view發送滑動事件請求，其實就是向SlideView發請求  
        if (mFocusedItemView != null) {  
            mFocusedItemView.onRequireTouchEvent(event);  
        }  
      
        return super.onTouchEvent(event);  
    }  

}
</span>

接下來就是主界面的activity了 

<span style="color:#009900;">import java.util.ArrayList;
import java.util.List;

import com.ryg.slideview.SlideView.OnSlideListener;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity implements OnItemClickListener,  
OnClickListener, OnSlideListener {  

private static final String TAG = "MainActivity";  

private ListViewCompat mListView;  

private List<MessageItem> mMessageItems = new ArrayList<MainActivity.MessageItem>();  

private SlideAdapter mSlideAdapter;  

// 上次處於打開狀態的SlideView  
private SlideView mLastSlideViewWithStatusOn;  

@Override  
protected void onCreate(Bundle savedInstanceState) {  
super.onCreate(savedInstanceState);  
setContentView(R.layout.activity_main);  
initView();  
}  

private void initView() {  
mListView = (ListViewCompat) findViewById(R.id.list);  

for (int i = 0; i < 20; i++) {  
    MessageItem item = new MessageItem();  
    if (i % 2 == 0) {  
        item.iconRes = R.drawable.default_qq_avatar;  
        item.title = "騰訊新聞";  
        item.msg = "天津大爆炸：河北大爆炸";  
        item.time = "晚上18:00";  
    } else {  
        item.iconRes = R.drawable.wechat_icon;  
        item.title = "微信團隊";  
        item.msg = "歡迎你使用微信";  
        item.time = "10月01日";  
    }  
    mMessageItems.add(item);  
}  
mSlideAdapter = new SlideAdapter();  
mListView.setAdapter(mSlideAdapter);  
mListView.setOnItemClickListener(this);  
}  

//listview 的適配器
private class SlideAdapter extends BaseAdapter {  

private LayoutInflater mInflater;  

SlideAdapter() {  
    super();  
    mInflater = getLayoutInflater();  
}  

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

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

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

@Override  
public View getView(int position, View convertView, ViewGroup parent) {  
    ViewHolder holder;  
    SlideView slideView = (SlideView) convertView;  
    if (slideView == null) {  
        // 這裏是我們的item  
        View itemView = mInflater.inflate(R.layout.list_item, null);  

        slideView = new SlideView(MainActivity.this);  
        // 這裏把item加入到slideView  
        slideView.setContentView(itemView);  
        // 下面是做一些數據緩存  
        holder = new ViewHolder(slideView);  
        slideView.setOnSlideListener(MainActivity.this);  
        slideView.setTag(holder);  
    } else {  
        holder = (ViewHolder) slideView.getTag();  
    }  
    MessageItem item = mMessageItems.get(position);  
    item.slideView = slideView;  
    item.slideView.shrink();  

    holder.icon.setImageResource(item.iconRes);  
    holder.title.setText(item.title);  
    holder.msg.setText(item.msg);  
    holder.time.setText(item.time);  
    holder.deleteHolder.setOnClickListener(MainActivity.this);  

    return slideView;  
}  

}  

public class MessageItem {  
public int iconRes;  
public String title;  
public String msg;  
public String time;  
public SlideView slideView;  
}  

private static class ViewHolder {  
public ImageView icon;  
public TextView title;  
public TextView msg;  
public TextView time;  
public ViewGroup deleteHolder;  

ViewHolder(View view) {  
    icon = (ImageView) view.findViewById(R.id.icon);  
    title = (TextView) view.findViewById(R.id.title);  
    msg = (TextView) view.findViewById(R.id.msg);  
    time = (TextView) view.findViewById(R.id.time);  
    deleteHolder = (ViewGroup) view.findViewById(R.id.holder);  
}  
}  

@Override  
public void onItemClick(AdapterView<?> parent, View view, int position,  
    long id) {  
// 這裏處理ListItem的點擊事件  
Log.e(TAG, "onItemClick position=" + position);  
}  

@Override  
public void onSlide(View view, int status) {  
// 如果當前存在已經打開的SlideView，那麼將其關閉  
if (mLastSlideViewWithStatusOn != null  
        && mLastSlideViewWithStatusOn != view) {  
    mLastSlideViewWithStatusOn.shrink();  
}  
// 記錄本次處於打開狀態的view  
if (status == SLIDE_STATUS_ON) {  
    mLastSlideViewWithStatusOn = (SlideView) view;  
}  
}  

@Override  
public void onClick(View v) {  
// 這裏處理刪除按鈕的點擊事件，可以刪除對話  
if (v.getId() == R.id.holder) {  
    int position = mListView.getPositionForView(v);  
    if (position != ListView.INVALID_POSITION) {  
        mMessageItems.remove(position);  
        mSlideAdapter.notifyDataSetChanged();  
    }  
    Log.e(TAG, "onClick v=" + v);  
}  
}  </span>
主界面中activity用到的xml 

<span style="color:#009900;"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.ryg.slideview.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" />

</LinearLayout></span>
listview適配器的佈局。 

<span style="color:#009900;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="58dp"
    android:background="@drawable/list_item_bg"
    android:descendantFocusability="blocksDescendants"
    android:gravity="center_vertical"
    android:paddingBottom="5dp"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    android:paddingTop="5dp" >

    <ImageView
        android:id="@+id/icon"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginRight="5dp"
        android:src="@drawable/wechat_icon" />

    <TextView
        android:id="@+id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@id/icon"
        android:textColor="@color/black"
        android:textSize="15sp" />

    <TextView
        android:id="@+id/msg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@id/icon"
        android:layout_alignLeft="@id/title"
        android:textColor="@color/grey" />

    <TextView
        android:id="@+id/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignTop="@id/title"
        android:textColor="@color/grey" />

</RelativeLayout></span>

附drawable目錄下的xml文件

holder_bg.xml

<span style="color:#009900;"><?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@color/dimgrey" android:state_pressed="true"></item>
    <item android:drawable="@color/dimgrey" android:state_focused="true"></item>
    <item android:drawable="@color/dimgrey" android:state_selected="true"></item>
    <item android:drawable="@color/gray" android:state_enabled="true"></item>
    <item android:drawable="@color/gray" android:state_enabled="false"></item>

</selector></span>
list_item_bg.xml. 

<span style="font-size:18px;color:#009900;"><?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/item_point_bg" android:state_pressed="true"></item>
    <item android:drawable="@drawable/item_point_bg" android:state_focused="true"></item>
    <item android:drawable="@drawable/item_point_bg" android:state_selected="true"></item>
    <item android:drawable="@android:color/transparent" android:state_enabled="true"></item>
    <item android:drawable="@android:color/transparent" android:state_enabled="false"></item>

</selector></span>
<span style="font-size:18px;color:#009900;">
</span>
<span style="font-size:18px;color:#333333;">還有一些對color顏色的定義，這裏就不貼了，大家可以直接換成顏色的代碼就可以。</span>



 

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