Android 自定义Listview 与嵌套ScrollView
本文讲实现一个自定义列表的Android程序，程序将实现一个使用自定义的适配器（Adapter）绑定数据，通过ontextView.setTag绑定数据有按钮的ListView。
系统显示列表（ListView）时，首先会实例化一个适配器，本文将实例化一个自定义的适配器。实现自定义适配器，必须手动映射数据，这时就需要重写getView()方法，系统在绘制列表的每一行的时候将调用此方法。
ListView在开始绘制的时候，系统自动调用getCount()函数，根据函数返回值得到ListView的长度，然后根据这个长度，调用getView()逐一画出每一行。
具体使用方法可以参考下面代码，只需记住Android自定义ListView三步骤：
第一步：准备主布局文件、组件布局文件等
第二步：获取并整理数据
第三部：绑定数据，这里我们是通过自己编写Adapter类来完成的
核心思路：
ListView 由Adapter填充，由LayoutInflater渲染。
自定义Adapter：
package com.findai.xkk.ai_interviewer.job_fragment;
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.findai.xkk.ai_interviewer.R;
import java.util.List;
import java.util.Map;
public class JobListView_Adapter extends BaseAdapter {
private List<Map<String, Object>> data;
private LayoutInflater layoutInflater;
private Context context;
public JobListView_Adapter(Context context, List<Map<String, Object>> data) {
this.context=context;
this.data=data;
this.layoutInflater=LayoutInflater.from(context);
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int position) {
return data.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public final class Zujian{
public ImageView img_job_img;
public TextView tv_job_name;
public TextView tv_jbdesc;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Zujian zujian = null;
if(convertView==null) {
zujian = new Zujian();
convertView = layoutInflater.inflate(R.layout.job_listview_item, null);
zujian.tv_job_name = convertView.findViewById(R.id.tv_jobname);
zujian.tv_jbdesc = convertView.findViewById(R.id.tv_jbdesc);
zujian.img_job_img = convertView.findViewById(R.id.img_job_img);
convertView.setTag(zujian);
}else {
zujian = (Zujian)convertView.getTag();
}
zujian.tv_jbdesc.setText(data.get(position).get("jobdesc").toString());
zujian.tv_job_name.setText(data.get(position).get("jobname").toString());
return convertView;
}
}
Activity调用：
package com.findai.xkk.ai_interviewer.job_fragment;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import com.findai.xkk.ai_interviewer.Http.Commiuncate_Server;
import com.findai.xkk.ai_interviewer.JobinfoActivity;
import com.findai.xkk.ai_interviewer.R;
import com.findai.xkk.ai_interviewer.WelcomeIndexActivity;
import com.findai.xkk.ai_interviewer.domain.Job;
import com.findai.xkk.ai_interviewer.domain.Question;
import com.oragee.banners.BannerView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@SuppressLint("ValidFragment")
public class Job_Index_maintop_Fragment extends Fragment implements View.OnClickListener{
BannerView bannerView;
@Override
public void onClick(View v) {
Bundle bundle;
Intent intent;
switch (v.getId()){
case R.id.btn_kj_interview:
bundle = new Bundle();
bundle.putInt("iid",1);
intent = new Intent(getContext(),WelcomeIndexActivity.class);
intent.putExtra("iid",bundle);
startActivity(intent);
break;
// case R.id.ll_job:
// bundle = new Bundle();
// bundle.putInt("jid",1);
// intent = new Intent(getContext(),JobinfoActivity.class);
// intent.putExtra("jid",bundle);
// startActivity(intent);
// break;
}
}
callbackQuestion_Choose_Fragment callbackQuestion_choose_fragment = null;
private Button btn_kj;
private LinearLayout ll_job;
private ListView lv;
private List<Map<String, Object>> data;
public Job_Index_maintop_Fragment() {
}
public Job_Index_maintop_Fragment(callbackQuestion_Choose_Fragment callbackQuestionChooseFragment) {
this.callbackQuestion_choose_fragment = callbackQuestionChooseFragment;
}
private int[] imgs = {R.mipmap.ad4,R.mipmap.ad3,R.mipmap.ad6,R.mipmap.ad7,R.mipmap.ad8,R.mipmap.ad1};
private List<View> viewList;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.job_center_maintop_activity, container, false);
lv = view.findViewById(R.id.lv_joblist);
data = getData();
System.out.println(data.size()+"----------------===");
lv.setAdapter(new JobListView_Adapter(getContext(),data));
fixListViewHeight(lv);
viewList = new ArrayList<View>();
for (int i = 0; i < imgs.length; i++) {
ImageView image = new ImageView(getContext());
image.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
//设置显示格式
image.setScaleType(ImageView.ScaleType.CENTER_CROP);
image.setImageResource(imgs[i]);
viewList.add(image);
}
bannerView = (BannerView) view.findViewById(R.id.banner_ad);
bannerView.startLoop(true);
bannerView.setLoopInterval(3000);
bannerView.setViewList(viewList);
btn_kj = view.findViewById(R.id.btn_kj_interview);
btn_kj.setOnClickListener(this);
// ll_job = view.findViewById(R.id.ll_job);
// ll_job.setOnClickListener(this);
return view;
}
private List<Job> joblist = new ArrayList<>();
public List<Map<String, Object>> getData(){
final Commiuncate_Server cs = new Commiuncate_Server();
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try{
joblist = cs.get_joblist(10);
// System.out.println(joblist.size()+"e21321=3=21=321=3");
}catch (Exception ex){
ex.printStackTrace();
}
}
});
thread.start();
while(joblist.size()==0){
}
List<Map<String, Object>> list=new ArrayList<Map<String,Object>>();
for (Job job : joblist) {
Map<String, Object> map=new HashMap<String, Object>();
// map.put("image", R.drawable.ic_launcher);
map.put("jobname", job.getJobName());
map.put("jobdesc", job.getDegree()+"|"+job.getWorkPlace());
list.add(map);
}
System.out.println(list.size());
return list;
}
public interface callbackQuestion_Choose_Fragment {
public int get_question_answer(int answer);
}
public void fixListViewHeight(ListView listView) {
// 如果没有设置数据适配器，则ListView没有子项，返回。
JobListView_Adapter listAdapter = (JobListView_Adapter) listView.getAdapter();
int totalHeight = 0;
if (listAdapter == null) {
return;
}
for (int index = 0, len = listAdapter.getCount(); index < len; index++) {
View listViewItem = listAdapter.getView(index , null, listView);
// 计算子项View 的宽高
listViewItem.measure(0, 0);
// 计算所有子项的高度和
totalHeight += listViewItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
// listView.getDividerHeight()获取子项间分隔符的高度
// params.height设置ListView完全显示需要的高度
params.height = totalHeight+ (listView.getDividerHeight() * (listAdapter.getCount() - 1));
listView.setLayoutParams(params);
}
}
Item布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent">
<!--一个工作banner-->
<LinearLayout
android:id="@+id/ll_job"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:weightSum="12"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="8">
<ImageView
android:id="@+id/img_job_img"
android:layout_width="80dp"
android:layout_height="80dp"
android:src="@mipmap/company_icon1"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_weight="4"
android:orientation="vertical">
<TextView
android:id="@+id/tv_jobname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#888888"
android:text="自媒体商务（实习生）"
android:textSize="15dp"/>
<TextView
android:id="@+id/tv_jbdesc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#888888"
android:layout_marginTop="5dp"
android:textSize="12dp"
android:text="本科 | 福建福州| 截止时间：02-03"/>
</LinearLayout>
</LinearLayout>
<!--一个工作banner end-->
</LinearLayout>Activity布局：
<?xml version="1.0" encoding="utf-8"?>
<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="wrap_content"
android:orientation="horizontal"
android:background="#ececec"
android:weightSum="12">
<!--<ScrollView-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="match_parent">-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.oragee.banners.BannerView
android:id="@+id/banner_ad"
android:layout_width="match_parent"
android:layout_height="212dp">
</com.oragee.banners.BannerView>
<!--<ImageView-->
<!--android:id="@+id/img_ad1"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="212dp"-->
<!--android:src="@mipmap/ad1" />-->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btn_kj_interview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="4"
android:text="会计面试"
style="@style/job_tiku_btn_css"
/>
<Button
android:id="@+id/btn_jsj_interview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="4"
android:text="医疗面试"
style="@style/job_tiku_btn_css"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="4"
android:text="软件面试"
style="@style/job_tiku_btn_css"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="4"
android:text="互联网面试"
style="@style/job_tiku_btn_css"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="4"
android:text="土木面试"
style="@style/job_tiku_btn_css"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="4"
android:text="人力资源面试"
style="@style/job_tiku_btn_css"
/>
</LinearLayout>
<ImageView
android:layout_width="match_parent"
android:layout_height="142dp"
android:src="@mipmap/ad2" />
<LinearLayout
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#ffffff"
android:orientation="vertical">
<ListView
android:id="@+id/lv_joblist"
android:layout_width="match_parent"
android:layout_height="300dp">
</ListView>
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="100dp"
android:layout_marginTop="20dp"
android:text="到底啦~"
android:gravity="center"/>
</LinearLayout>
<!--</ScrollView>-->
</LinearLayout>