现在很多流行的APP要表达的内容都很多，很多app为了节省布局资源，在listview 的靠右的部分加入了“更多”之类的字样，提醒用户点击这里 可以看到跟多的内容，这样整个listview要表达的内容就少了，看起来就要简洁舒服。接下来我就为大家实现一下这个特效。先来看看效果，源码放在最后供下载参看：
效果看完了，那就来一步一步实现这个效果。
1.布局代码如下：
主布局：
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<ListView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/listView"
android:layout_gravity="center_horizontal" />
</LinearLayout>
单项布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="100dp">
<ImageView
android:id="@+id/touXiang"
android:background="#f00"
android:layout_width="100dp"
android:layout_height="match_parent" />
<TextView
android:id="@+id/tv"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"/>
<Button
android:id="@+id/more"
android:layout_width="60dp"
android:layout_height="match_parent"
android:background="#ccc"
android:text="更多"/>
</LinearLayout>
<LinearLayout
android:id="@+id/moreLayout"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#aaa"
android:gravity="center|center_horizontal">
<ImageButton
android:id="@+id/dianZan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/shoucang"/>
</LinearLayout>
</LinearLayout>
效果如下：
2、主代码如下：
package com.example.my.learnactionbarexample;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ListView lv;
private item item;
private ArrayList<item> items;
private int[] touxiang ={R.drawable.touxiang1,R.drawable.touxiang2,R.drawable.touxiang3,
R.drawable.touxiang4,R.drawable.touxiang5,R.drawable.touxiang6};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listView);
items = new ArrayList<item>();
for (int i = 0; i < 6; i++) {
item = new item();
item.setName("名字:"+i);
item.setImg(touxiang[i]);
item.setIsDianZan(false);
items.add(item);
}
lv.setAdapter(new myAdapter(MainActivity.this,items));
}
}
自定义实体类如下：
package com.example.my.learnactionbarexample;
/**
* Created by Administrator on 2015/11/16.
*/
public class item {
public Integer getImg() {
return img;
}
public void setImg(Integer img) {
this.img = img;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Boolean getIsDianZan() {
return isDianZan;
}
public void setIsDianZan(Boolean isDianZan) {
this.isDianZan = isDianZan;
}
private Integer img;
private String name;
private Boolean isDianZan;
}
实体类主要是封装一些单项列表的数据，这个可以根据具体情况定义，我这拿点赞来做演示。
3、BaseAdapter的实现：
package com.example.my.learnactionbarexample;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by Administrator on 2015/11/16.
*/
public class myAdapter extends BaseAdapter {
private Context context;
private ArrayList<item> items;
private LayoutInflater inflater;
private Boolean[] isOpens = new Boolean[20];
public myAdapter(Context context, ArrayList<item> items) {
this.context = context;
this.items = items;
inflater = LayoutInflater.from(context);
for (int i = 0; i < items.size(); i++) {
isOpens[i] = false;
}
}
@Override
public int getCount() {
return items.size();
}
@Override
public Object getItem(int position) {
return items.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null){
holder = new ViewHolder();
convertView = inflater.inflate(R.layout.list_item,null);
holder.tv = (TextView) convertView.findViewById(R.id.tv);
holder.touXiang = (ImageView) convertView.findViewById(R.id.touXiang);
holder.more = (Button) convertView.findViewById(R.id.more);
holder.ll = (LinearLayout) convertView.findViewById(R.id.moreLayout);
holder.dianZan = (ImageButton) convertView.findViewById(R.id.dianZan);
convertView.setTag(holder);
}else {
holder = (ViewHolder) convertView.getTag();
}
holder.touXiang.setImageResource(items.get(position).getImg());
holder.tv.setText(items.get(position).getName());
if (items.get(position).getIsDianZan()){
holder.dianZan.setImageResource(R.drawable.dianzan1);
}else {
holder.dianZan.setImageResource(R.drawable.dianzan0);
}
holder.more.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (isOpens[position]) {
isOpens[position] = false;
notifyDataSetChanged();
} else {
isOpens[position] = true;
for (int i = 0; i < getCount(); i++) {
if (i == position){
continue;
}
isOpens[i] = false;
}
notifyDataSetChanged();
}
}
});
if (isOpens[position]){
holder.ll.setVisibility(View.VISIBLE);
}else {
holder.ll.setVisibility(View.GONE);
}
holder.dianZan.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (items.get(position).getIsDianZan()){
items.get(position).setIsDianZan(false);
}else {
items.get(position).setIsDianZan(true);
}
notifyDataSetChanged();
}
});
return convertView;
}
public final class ViewHolder{
private TextView tv;
public ImageView touXiang;
public Button more;
public LinearLayout ll;
public ImageButton dianZan;
}
}