模仿新浪微博随便看看栏目
2015-05-08 15:08
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在UI布局中,关于ListView组件的使用
模拟新浪微博的随便看看栏目
最终的运行效果图为:
Step1:定义一个实体类MyListView,作为ListView 适配器的适配类型
Step2:为ListView 的子项指定一个我们自定义的布局list_layout.xml
Step3:创建一个自定义的适配器ArticleAdapter,这个适配器继承自ArrayAdapter,重写构造方法和getView 方法
public View getView(int position, View convertView, ViewGroup parent) {
ListItem listitem;
if(convertView==null)
{
convertView=(LinearLayout)LayoutInflater.from(context).inflate(R.layout.list_layout, null);
listitem=new ListItem();
listitem.img=(ImageView)convertView.findViewById(R.id.head_img);
listitem.name=(TextView)convertView.findViewById(R.id.name);
listitem.time=(TextView)convertView.findViewById(R.id.time);
listitem.rq=(TextView)convertView.findViewById(R.id.action_settings);
listitem.article=(TextView)convertView.findViewById(R.id.article);
convertView.setTag(listitem);
}else {
listitem=(ListItem)convertView.getTag();
}
listitem.img.setImageDrawable(list_mes.get(position).getImg());
listitem.name.setText(list_mes.get(position).getName());
listitem.time.setText(list_mes.get(position).getTime());
listitem.rq.setText(list_mes.get(position).getRq());
listitem.article.setText(list_mes.get(position).getArticel());
return convertView;
}
下面分别选取几个重要的代码:
1.MainActivity.java
package bzu.edu.cn;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;
import bzu.edu.cn.adapter.ArticleAdapter;
import bzu.edu.cn.adapter.Messages;
import bzu.edu.cn.view.MyListView;
import bzu.edu.hou.R;
import android.R.integer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.res.TypedArray;
import android.view.Menu;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
private MyListView mylistview=null;
private List<Messages> list_msg=null;
private BaseAdapter adapter=null;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
init();
if(list_msg==null){
getData();
}
adapter=new ArticleAdapter(this,list_msg);
mylistview.setOnRershListener(new OnRershListener());
mylistview.setAdapter(adapter);
}
private void getData() {
String names[];
String article[];
TypedArray img;
int i;
names=getResources().getStringArray(R.array.name);
article=getResources().getStringArray(R.array.article);
img=getResources().obtainTypedArray(R.array.head_photo);
list_msg=new ArrayList<Messages>();
for(i=0;i<names.length;i++){
Messages message=new Messages();
message.setImg(img.getDrawable(i));
message.setName(names[i]);
message.setArticel(article[i]);
Date date=new Date();
message.setTime(simple.format(date));
list_msg.add(message);
}
}
private void init() {
// TODO Auto-generated method stub
mylistview=(MyListView)findViewById(R.id.myListView1);
// mylistview=new MyListView(this);
// LinearLayout linear=(LinearLayout)MainActivity.this.findViewById(R.id.liner);
// linear.addView(mylistview);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
Handler handler=new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message arg0) {
// TODO Auto-generated method stub
if(arg0.what==0){
//结束刷新
mylistview.endOnRersh();
}
return false;
}
});
class OnRershListener implements OnRersh{
@Override
public void OnRershListener() {
new Thread(new Run()).start();
}
}
class Run implements Runnable{
public void run() {
try {
Thread.sleep(2000);
} catch (Exception e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0);
}
}
}
2.布局文件 list_layout.xml
运用布局的嵌套
<?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"
android:padding="10dip"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<ImageView
android:id="@+id/head_img"
android:src="@drawable/p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dip"
android:layout_alignParentLeft="true"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/head_img"
android:layout_marginLeft="7dip"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_co
4000
ntent">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:textColor="#FF6666"
android:textSize="16sp"
android:typeface="sans"
android:textStyle="bold"
android:text="潇湘夜雨"/>
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/name"
android:layout_alignBottom="@id/name"
android:layout_marginLeft="5dip"
android:textColor="#696969"
android:textSize="12sp"
android:text="12:11"/>
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dip">
<TextView
android:id="@+id/article"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="50px"
android:textSize="12sp"
android:text="这几天我学会了使用ListView组件。这个组件真的很有用。希望在今后的学习中能大量的用到。好好学习android开发。更多的精彩还在等着我们呢......"/>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
图片效果为:
模拟新浪微博的随便看看栏目
最终的运行效果图为:
Step1:定义一个实体类MyListView,作为ListView 适配器的适配类型
Step2:为ListView 的子项指定一个我们自定义的布局list_layout.xml
Step3:创建一个自定义的适配器ArticleAdapter,这个适配器继承自ArrayAdapter,重写构造方法和getView 方法
public View getView(int position, View convertView, ViewGroup parent) {
ListItem listitem;
if(convertView==null)
{
convertView=(LinearLayout)LayoutInflater.from(context).inflate(R.layout.list_layout, null);
listitem=new ListItem();
listitem.img=(ImageView)convertView.findViewById(R.id.head_img);
listitem.name=(TextView)convertView.findViewById(R.id.name);
listitem.time=(TextView)convertView.findViewById(R.id.time);
listitem.rq=(TextView)convertView.findViewById(R.id.action_settings);
listitem.article=(TextView)convertView.findViewById(R.id.article);
convertView.setTag(listitem);
}else {
listitem=(ListItem)convertView.getTag();
}
listitem.img.setImageDrawable(list_mes.get(position).getImg());
listitem.name.setText(list_mes.get(position).getName());
listitem.time.setText(list_mes.get(position).getTime());
listitem.rq.setText(list_mes.get(position).getRq());
listitem.article.setText(list_mes.get(position).getArticel());
return convertView;
}
下面分别选取几个重要的代码:
1.MainActivity.java
package bzu.edu.cn;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;
import bzu.edu.cn.adapter.ArticleAdapter;
import bzu.edu.cn.adapter.Messages;
import bzu.edu.cn.view.MyListView;
import bzu.edu.hou.R;
import android.R.integer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.res.TypedArray;
import android.view.Menu;
import android.view.Window;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
private MyListView mylistview=null;
private List<Messages> list_msg=null;
private BaseAdapter adapter=null;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
init();
if(list_msg==null){
getData();
}
adapter=new ArticleAdapter(this,list_msg);
mylistview.setOnRershListener(new OnRershListener());
mylistview.setAdapter(adapter);
}
private void getData() {
String names[];
String article[];
TypedArray img;
int i;
names=getResources().getStringArray(R.array.name);
article=getResources().getStringArray(R.array.article);
img=getResources().obtainTypedArray(R.array.head_photo);
list_msg=new ArrayList<Messages>();
for(i=0;i<names.length;i++){
Messages message=new Messages();
message.setImg(img.getDrawable(i));
message.setName(names[i]);
message.setArticel(article[i]);
Date date=new Date();
message.setTime(simple.format(date));
list_msg.add(message);
}
}
private void init() {
// TODO Auto-generated method stub
mylistview=(MyListView)findViewById(R.id.myListView1);
// mylistview=new MyListView(this);
// LinearLayout linear=(LinearLayout)MainActivity.this.findViewById(R.id.liner);
// linear.addView(mylistview);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
Handler handler=new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message arg0) {
// TODO Auto-generated method stub
if(arg0.what==0){
//结束刷新
mylistview.endOnRersh();
}
return false;
}
});
class OnRershListener implements OnRersh{
@Override
public void OnRershListener() {
new Thread(new Run()).start();
}
}
class Run implements Runnable{
public void run() {
try {
Thread.sleep(2000);
} catch (Exception e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0);
}
}
}
2.布局文件 list_layout.xml
运用布局的嵌套
<?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"
android:padding="10dip"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<ImageView
android:id="@+id/head_img"
android:src="@drawable/p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dip"
android:layout_alignParentLeft="true"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/head_img"
android:layout_marginLeft="7dip"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_co
4000
ntent">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:textColor="#FF6666"
android:textSize="16sp"
android:typeface="sans"
android:textStyle="bold"
android:text="潇湘夜雨"/>
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/name"
android:layout_alignBottom="@id/name"
android:layout_marginLeft="5dip"
android:textColor="#696969"
android:textSize="12sp"
android:text="12:11"/>
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dip">
<TextView
android:id="@+id/article"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="50px"
android:textSize="12sp"
android:text="这几天我学会了使用ListView组件。这个组件真的很有用。希望在今后的学习中能大量的用到。好好学习android开发。更多的精彩还在等着我们呢......"/>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
图片效果为: