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最近由于項目需求，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，終于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圖怎么做，大家將就看一下吧）。
側滑效果圖
點擊刪除后的截圖
點擊刪除后，listview中的第一個“微信團隊”被刪除。
接下來看代碼部分，很多注釋都在代碼中，直接上代碼。
首先自定義個SlideView繼承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 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坐標
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);
// 設置其方向為橫向
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;
}
// 將當前狀態置為關閉
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于onTouchEvent
// 如果你不需要處理滑動沖突，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;
// 這里做了下判斷，當松開手的時候，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();
}
}
}
自定義SlideView所關聯的xml.(主要就是布局側滑顯出來的刪除按鈕)
<?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>
自定義ListViewCompat繼承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();
//根據坐標獲取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，為什么要這么干？為什么不用getChildAt(position)？
//因為ListView會進行緩存，如果你不這么干，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);
}
}
接下來就是主界面的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;
// 上次處于打開狀態的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) {
// 這里是我們的item
View itemView = mInflater.inflate(R.layout.list_item, null);
slideView = new SlideView(MainActivity.this);
// 這里把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) {
// 這里處理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，那么將其關閉
if (mLastSlideViewWithStatusOn != null
&& mLastSlideViewWithStatusOn != view) {
mLastSlideViewWithStatusOn.shrink();
}
// 記錄本次處于打開狀態的view
if (status == SLIDE_STATUS_ON) {
mLastSlideViewWithStatusOn = (SlideView) view;
}
}
@Override
public void onClick(View v) {
// 這里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);
}
}
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適配器的布局。
<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目錄下的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>
還有一些對color顏色的定義，這里就不貼了，大家可以直接換成顏色的代碼就可以。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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