Android仿微信实现左滑显示删除按钮功能

发布时间：2020-10-22 17:06:04

来源：脚本之家

阅读：83

作者：冯健-developer

在实际项目中删除列表中的某一项是非常常见的功能，传统的做法可以使用长按监听器等，而现在流行的做法是左滑弹出删除按钮，微信，QQ等都是这么做的，下面做一个示例，代码如下：

主页面MainActivity：代码比较简单常规

package com.home.testslideview;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ListView;

import com.home.textslideview.R;

public class MainActivity extends Activity {

private ListView listView;

private List list = new ArrayList();

// 适配器

private SlideAdapter adapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

initView();

initData();

setAdapter();

}

/**

* 初始化页面控件

*/

private void initView() {

listView = (ListView) findViewById(R.id.main_lv);

}

/**

* 初始化数据

*/

private void initData() {

list.add(new NewInfoBean("这是测试内容1"));

list.add(new NewInfoBean("这是测试内容2"));

list.add(new NewInfoBean("这是测试内容3"));

list.add(new NewInfoBean("这是测试内容4"));

list.add(new NewInfoBean("这是测试内容5"));

list.add(new NewInfoBean("这是测试内容6"));

list.add(new NewInfoBean("这是测试内容7"));

list.add(new NewInfoBean("这是测试内容8"));

list.add(new NewInfoBean("这是测试内容9"));

list.add(new NewInfoBean("这是测试内容10"));

}

/**

* 设置适配器

*/

private void setAdapter() {

if (adapter == null) {

adapter = new SlideAdapter(this, list);

listView.setAdapter(adapter);

} else {

adapter.setList(list);

adapter.notifyDataSetChanged();

}

}

}

实体类NewInfoBean：具体项目中由自己定义：

package com.home.testslideview;

public class NewInfoBean {

public SlideView slideView;

private String content;

public SlideView getSlideView() {

return slideView;

}

public void setSlideView(SlideView slideView) {

this.slideView = slideView;

}

public String getContent() {

return content;

}

public void setContent(String content) {

this.content = content;

}

public NewInfoBean() {

super();

}

public NewInfoBean(String content) {

super();

this.content = content;

}

}

适配器SlideAdapter：也比较简单

package com.home.testslideview;

import java.util.List;

import android.content.Context;

import android.util.SparseArray;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

import com.home.testslideview.SlideView.OnSlideListener;

import com.home.textslideview.R;

public class SlideAdapter extends BaseAdapter implements OnSlideListener,

OnClickListener {

private LayoutInflater inflater;

private List list;

private Context context;

public SlideAdapter(Context context, List list) {

if (inflater == null) {

inflater = LayoutInflater.from(context);

}

this.list = list;

this.context = context;

}

@Override

public int getCount() {

return list.size();

}

@Override

public Object getItem(int position) {

return list.get(position);

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup arg2) {

SlideView slideView = (SlideView) convertView;

NewInfoBean bean = list.get(position);

if (slideView == null) {

slideView = new SlideView(context);

slideView.setOnSlideListener(this);

}

// 设置内容

TextView contentText = getAdapterView(slideView,

R.id.slideview_tv_content, position);

contentText.setText(bean.getContent());

// 删除按钮

TextView delText = getAdapterView(slideView, R.id.slideview_tv_del,

position);

delText.setOnClickListener(this);

bean.slideView = slideView;

bean.slideView.shrink();

return slideView;

}

@SuppressWarnings("unchecked")

public T getAdapterView(View convertView, int id,

Object tag) {

SparseArray viewHolder = null;

try {

if (convertView.getTag(R.id.view_holder) instanceof SparseArray>) {

viewHolder = (SparseArray) convertView

.getTag(R.id.view_holder);

}

} catch (ClassCastException e) {

}

if (viewHolder == null) {

viewHolder = new SparseArray();

convertView.setTag(R.id.view_holder, viewHolder);

convertView.setTag(R.id.order_id, tag);

}

View childView = viewHolder.get(id);

if (childView == null) {

childView = convertView.findViewById(id);

childView.setTag(tag);

viewHolder.put(id, childView);

}

return (T) childView;

}

public List getList() {

return list;

}

public void setList(List list) {

this.list = list;

}

@Override

public void onSlide(View view, int status) {

}

@Override

public void onClick(View v) {

switch (v.getId()) {

case R.id.slideview_tv_del:

int position = (Integer) v.getTag();

list.remove(position);

notifyDataSetChanged();

break;

default:

break;

}

}

}

比较关键的两个类：

自定义的ListView：SlideListView

package com.home.testslideview;

import android.content.Context;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.widget.ListView;

public class SlideListView extends ListView {

private SlideView itemView;

public SlideListView(Context context) {

super(context);

}

public SlideListView(Context context, AttributeSet attrs) {

super(context, attrs);

}

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);

if (position != INVALID_POSITION) {

NewInfoBean data = (NewInfoBean) getItemAtPosition(position);

itemView = data.slideView;

}

}

default:

break;

}

if (itemView != null) {

itemView.onRequireTouchEvent(event);

}

return super.onTouchEvent(event);

}

}

自定义的ListView中的每一行控件：SlideView(借鉴网上的一个示例)：

package com.home.testslideview;

import android.content.Context;

import android.util.AttributeSet;

import android.util.Log;

import android.util.TypedValue;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.widget.LinearLayout;

import android.widget.Scroller;

import com.home.textslideview.R;

public class SlideView extends LinearLayout {

private static final String TAG = SlideView.class.getSimpleName();

private Context mContext;

private Scroller mScroller;

private OnSlideListener mOnSlideListener;

private int mHolderWidth = 80;

private int mLastX = 0;

private int mLastY = 0;

private static final int TAN = 2;

private LayoutInflater inflater;

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();

if (inflater == null) {

inflater = LayoutInflater.from(mContext);

}

mScroller = new Scroller(mContext);

setOrientation(LinearLayout.HORIZONTAL);

View.inflate(mContext, R.layout.slide_view_merge, this);

mHolderWidth = Math.round(TypedValue.applyDimension(

TypedValue.COMPLEX_UNIT_DIP, mHolderWidth, getResources()

.getDisplayMetrics()));

}

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 (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;

}

this.smoothScrollTo(newScrollX, 0);

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;

mScroller.startScroll(scrollX, 0, delta, 0, Math.abs(delta) * 3);

invalidate();

}

@Override

public void computeScroll() {

if (mScroller.computeScrollOffset()) {

scrollTo(mScroller.getCurrX(), mScroller.getCurrY());

postInvalidate();

}

}

}

main.xml：

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

android:id="@+id/main_lv"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:cacheColorHint="#00000000"

android:fadingEdge="none"

android:listSelector="#00000000"

android:scrollbars="none" />

slide_view_merge.xml：

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal" >

android:id="@+id/slideview_layout_content"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_gravity="center_vertical"

android:gravity="center_vertical"

android:orientation="horizontal" >

android:id="@+id/slideview_tv_content"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="内容部分"/>

android:id="@+id/view_layout_del"

android:layout_width="80dp"

android:layout_height="match_parent"

android:layout_gravity="center_vertical"

android:layout_toRightOf="@id/slideview_layout_content"

android:clickable="true"

android:gravity="center_vertical"

android:orientation="horizontal" >

android:id="@+id/slideview_tv_del"

android:layout_width="80dp"

android:layout_height="match_parent"

android:layout_marginBottom="2dp"

android:gravity="center"

android:padding="15dp"

android:text="删除"/>

源码下载：高仿微信左滑删除效果

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亿速云。