Android实现圆角ListView效果

在项目开发中我们可能会碰到圆角ListView效果，因为直角的看起来确实不那么雅观，可能大家会想到用图片实现，试想上中下要分别做三张图片，这样做太繁琐，这时使用shape来实现不失为一种更好的实现方式。

先看一下Android 中Shape的使用方法：

solid：实心，就是填充的意思

android:color指定填充的颜色

gradient：渐变

android:startColor和android:endColor分别为起始和结束颜色，ndroid:angle是渐变角度，必须为45的整数倍。另外渐变默认的模式为android:type='linear'，即线性渐变，可以指定渐变为径向渐变，android:type='radial'，径向渐变需要指定半径android:gradientRadius='50'。

stroke：描边

android: 描边的宽度，android:color 描边的颜色。我们还可以把描边弄成虚线的形式，设置方式为：android:dashWidth='5dp'android:dashGap='3dp'其中android:dashWidth表示’-’这样一个横线的宽度，android:dashGap表示之间隔开的距离。

corners：圆角

android:radius为角的弧度，值越大角越圆。

当然，这里并不是说这种圆角的列表一段是ListView来实现的，可能是由多个LinearLayout/RelativeLayout叠起来的。这个就看你怎么取舍了；如果列表项固定不怎么变化可以采取后者来实现比较好，如果需要动态变化那么使用ListView来实现更优。

下面来定义一下ListView只有一项时的背景(上下两个角都是圆角) app_list_corner_round.xml

<?xml version='1.0' encoding='utf-8'?><shape xmlns:android='http://schemas.android.com/apk/res/android' android:shape='rectangle' > <!-- 渐变 --> <gradient android:angle='270' android:endColor='@color/white' android:startColor='@color/white' /> <!-- 圆角 --> <corners android:bottomLeftRadius='4dip' android:bottomRightRadius='4dip' android:topLeftRadius='4dip' android:topRightRadius='4dip' /> </shape>

ListView第一项的背景(上面是圆角，下面是直角) app_list_corner_round_top.xml

<?xml version='1.0' encoding='utf-8'?><shape xmlns:android='http://schemas.android.com/apk/res/android' android:shape='rectangle' > <gradient android:angle='270' android:endColor='@color/white' android:startColor='@color/white' /> <corners android:topLeftRadius='@dimen/app_list_radius' android:topRightRadius='@dimen/app_list_radius' /> </shape>

ListView最后一项的背景(上面是直角，下面是圆角) app_list_corner_round_bottom.xml

<?xml version='1.0' encoding='utf-8'?><shape xmlns:android='http://schemas.android.com/apk/res/android' android:shape='rectangle' > <gradient android:angle='270' android:endColor='@color/white' android:startColor='@color/white' /> <corners android:bottomLeftRadius='@dimen/app_list_radius' android:bottomRightRadius='@dimen/app_list_radius' /> </shape>

ListView中间项的背景(上下都是直角) app_list_corner_round_center.xml

<?xml version='1.0' encoding='utf-8'?><shape xmlns:android='http://schemas.android.com/apk/res/android' android:shape='rectangle' > <gradient android:angle='270' android:endColor='@color/white' android:startColor='@color/white' /> </shape>

接下来先看看Adapter的实现

package com.example.roundcorner.adapter; import java.util.List; import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView; import com.example.roundcorner.R;import com.example.roundcorner.entity.ListBean; public class ListAdapter extends BaseAdapter { private List<ListBean> mList; private Context mContext; public ListAdapter(Context mContext,List<ListBean> mList) { this.mList = mList; this.mContext = mContext.getApplicationContext(); } @Override public int getCount() { return this.mList.size(); } @Override public Object getItem(int position) { return this.mList.get(position); } @Override public long getItemId(int position) { return position; } @Override public int getItemViewType(int position) { // TODO Auto-generated method stub return super.getItemViewType(position); } @Override public int getViewTypeCount() { // TODO Auto-generated method stub return super.getViewTypeCount(); } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = LayoutInflater.from(this.mContext).inflate( R.layout.listview_item, null, false); holder.textView = (TextView) convertView .findViewById(R.id.listview_item_textview); holder.imageView = (ImageView) convertView .findViewById(R.id.listview_item_imageview); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } if(position==0){ if(position == getCount()-1){ //只有一项 convertView.setBackgroundResource(R.drawable.app_list_corner_round); }else{ //第一项 convertView.setBackgroundResource(R.drawable.app_list_corner_round_top); } }else if(position == getCount()-1){ convertView.setBackgroundResource(R.drawable.app_list_corner_round_bottom); }else{ convertView.setBackgroundResource(R.drawable.app_list_corner_round_center); } ListBean lb = mList.get(position); holder.textView.setText(lb.getKey()); return convertView; } static class ViewHolder { TextView textView; ImageView imageView; }}

listview_item.xml

<?xml version='1.0' encoding='utf-8'?><RelativeLayout xmlns:android='http://schemas.android.com/apk/res/android' android:layout_width='match_parent' android:layout_height='wrap_content'> <TextView android: android:layout_width='wrap_content' android:layout_height='48dp' android:paddingLeft='10dp' android:gravity='center_vertical' android:layout_centerVertical='true' android:text='A-H' android:textColor='@color/black' android:textSize='20sp' /> <ImageView android: android:layout_width='wrap_content' android:layout_height='wrap_content' android:src='https://www.haobala.com/bcjs/@drawable/arrow' android:layout_alignParentRight='true' android:layout_centerVertical='true' /> </RelativeLayout>

最后看看主界面Activity的实现

package com.example.roundcorner; import java.util.ArrayList;import java.util.List; import android.app.Activity;import android.os.Bundle;import android.widget.ListView; import com.example.roundcorner.adapter.ListAdapter;import com.example.roundcorner.entity.ListBean; public class MainActivity extends Activity { private List<ListBean> data; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initData(); findView(); } private void findView() { ListView mListView = (ListView) findViewById(R.id.mListView); ListAdapter mAdapter = new ListAdapter(this,data); mListView.setAdapter(mAdapter); } private void initData() { data = new ArrayList<ListBean>(); for (int i = 0; i < 5; i++) { ListBean lb = new ListBean(); lb.setKey('设置 '+i); data.add(lb); } } }

activity_main.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' android:orientation='vertical' tools:context='.MainActivity' > <TextView android:layout_width='match_parent' android:layout_height='48dp' android:background='@color/white' android:gravity='center' android:text='设置' android:textSize='20sp' /> <RelativeLayout android:layout_width='match_parent' android:layout_height='match_parent' android:padding='10dp' > <ListView android: android:layout_width='match_parent' android:layout_height='wrap_content' android:background='@drawable/app_list_round' android:cacheColorHint='@android:color/transparent' android:divider='@drawable/app_list_divider' android:dividerHeight='2dip' android:padding='2dp' /> </RelativeLayout> </LinearLayout>

最后看看实现的效果

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好吧啦网。