android实现QQ微信侧滑删除效果

最近由于项目需求，需要做一个listview中的item策划删除的效果，与是查找资料和参考了一些相关的博客，终于完美实现了策划删除的效果。

先看一下效果图（研究了半天竟然没研究出来真机上gif图怎么做，大家将就看一下吧）。

侧滑效果图

点击删除后的截图

点击删除后，listview中的第一个“微信团队”被删除。

接下来看代码部分，很多注释都在代码中，直接上代码。

首先自定义个SlideView继承LinearLayout。

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 继承自LinearLayout
 */
public class SlideView extends LinearLayout {  

  private static final String TAG = "SlideView";  

  private Context mContext;  

  // 用来放置所有view的容器
  private LinearLayout mViewContent;  

  // 用来放置内置view的容器，比如删除 按钮
  private RelativeLayout mHolder;  

  // 弹性滑动对象，提供弹性滑动效果
  private Scroller mScroller;  

  // 滑动回调接口，用来向上层通知滑动事件
  private OnSlideListener mOnSlideListener;  

  // 内置容器的宽度 单位：dp
  private int mHolderWidth = 120;  

  // 分别记录上次滑动的坐标
  private int mLastX = 0;
  private int mLastY = 0;  

  // 用来控制滑动角度，仅当角度a满足如下条件才进行滑动：tan a = deltaX / deltaY > 2
  private static final int TAN = 2;  

  public interface OnSlideListener {
    // SlideView的三种状态：开始滑动，打开，关闭
    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();
    // 初始化弹性滑动对象
    mScroller = new Scroller(mContext);
    // 设置其方向为横向
    setOrientation(LinearLayout.HORIZONTAL);
    // 将slide_view_merge加载进来
    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()));
  }  

  // 设置按钮的内容，也可以设置图标啥的，我没写
  public void setButtonText(CharSequence text) {
    ((TextView) findViewById(R.id.delete)).setText(text);
  }  

  // 将view加入到ViewContent中
  public void setContentView(View view) {
    mViewContent.addView(view);
  }  

  // 设置滑动回调
  public void setOnSlideListener(OnSlideListener onSlideListener) {
    mOnSlideListener = onSlideListener;
  }  

  // 将当前状态置为关闭
  public void shrink() {
    if (getScrollX() != 0) {
      this.smoothScrollTo(0, 0);
    }
  }  

  // 根据MotionEvent来进行滑动，这个方法的作用相当于onTouchEvent
  // 如果你不需要处理滑动冲突，可以直接重命名，照样能正常工作
  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) {
        // 滑动不满足条件，不做横向滑动
        break;
      }  

      // 计算滑动终点是否合法，防止滑动越界
      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;
      // 这里做了下判断，当松开手的时候，会自动向两边滑动，具体向哪边滑，要看当前所处的位置
      if (scrollX - mHolderWidth * 0.75 > 0) {
        newScrollX = mHolderWidth;
      }
      // 慢慢滑向终点
      this.smoothScrollTo(newScrollX, 0);
      // 通知上层滑动事件
      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) {
    // 缓慢滚动到指定位置
    int scrollX = getScrollX();
    int delta = destX - scrollX;
    // 以三倍时长滑向destX，效果就是慢慢滑动
    mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3);
    invalidate();
  }  

  @Override
  public void computeScroll() {
    if (mScroller.computeScrollOffset()) {
      scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
      postInvalidate();
    }
  }  

}

自定义SlideView所关联的xml.(主要就是布局侧滑显出来的删除按钮)

<?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="删除" />
  </RelativeLayout> 

</merge>

自定义ListViewCompat继承Listview。

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();
      //根据坐标获取item所在的行
      int position = pointToPosition(x, y);
      Log.e(TAG, "postion=" + position);
      if (position != INVALID_POSITION) {
        //得到当前点击行的数据从而取出当前行的item。
        //可能有人怀疑，为什么要这么干？为什么不用getChildAt(position)？
        //因为ListView会进行缓存，如果你不这么干，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;
    }  

    //向当前点击的view发送滑动事件请求，其实就是向SlideView发请求
    if (mFocusedItemView != null) {
      mFocusedItemView.onRequireTouchEvent(event);
    }  

    return super.onTouchEvent(event);
  }  

} 

接下来就是主界面的activity了

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;  

// 上次处于打开状态的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 = "腾讯新闻";
    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 = "微信团队";
    item.msg = "欢迎你使用微信";
    item.time = "10月01日";
  }
  mMessageItems.add(item);
}
mSlideAdapter = new SlideAdapter();
mListView.setAdapter(mSlideAdapter);
mListView.setOnItemClickListener(this);
}  

//listview 的适配器
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) {
    // 这里是我们的item
    View itemView = mInflater.inflate(R.layout.list_item, null);  

    slideView = new SlideView(MainActivity.this);
    // 这里把item加入到slideView
    slideView.setContentView(itemView);
    // 下面是做一些数据缓存
    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) {
// 这里处理ListItem的点击事件
Log.e(TAG, "onItemClick position=" + position);
}  

@Override
public void onSlide(View view, int status) {
// 如果当前存在已经打开的SlideView，那么将其关闭
if (mLastSlideViewWithStatusOn != null
    && mLastSlideViewWithStatusOn != view) {
  mLastSlideViewWithStatusOn.shrink();
}
// 记录本次处于打开状态的view
if (status == SLIDE_STATUS_ON) {
  mLastSlideViewWithStatusOn = (SlideView) view;
}
}  

@Override
public void onClick(View v) {
// 这里处理删除按钮的点击事件，可以删除对话
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);
}
} 

主界面中activity用到的xml

<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>

listview适配器的布局。

<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>

附drawable目录下的xml文件
holder_bg.xml

<?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>

list_item_bg.xml.

<?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>

还有一些对color颜色的定义，这里就不贴了，大家可以直接换成颜色的代码就可以。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。