Android列表ListView用NotifyDataSetChanged实现动态更新

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本文出自【吴孝城的CSDN博客】

在Android中的ListView列表中添加列时，用NotifyDataSetChanged实现动态更新

需要编辑的内容如下



activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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">

<ListView
android:id="@+id/list_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

<android.support.design.widget.FloatingActionButton
android:id="@+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:src="@android:drawable/ic_input_add" />

</FrameLayout>

item_list.xml

<?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:orientation="horizontal">

<ImageView
android:id="@+id/itemIcon"
android:layout_width="40dp"
android:layout_height="40dp"
android:src="@mipmap/ic_launcher"/>
<TextView
android:id="@+id/itemText"
android:layout_width="match_parent"
android:layout_height="40dp"
android:text="Hello World"
android:textSize="20sp"/>

</LinearLayout>

MainActivity.java

package cn.wuxiaocheng.notifydatasetchanged;

import android.content.Context;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

import java.util.LinkedList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

private ListView listView;
private List<HelloBean> mdata = null;
private HelloAdapter madapter = null;
private Context mcontext = null;
private int i = 1;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mcontext = MainActivity.this;
listView = (ListView) findViewById(R.id.list_item);
mdata = new LinkedList<HelloBean>();
madapter = new HelloAdapter((LinkedList<HelloBean>) mdata, mcontext);
listView.setAdapter(madapter);

final FloatingActionButton button = (FloatingActionButton) findViewById(R.id.add);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
madapter.add(new HelloBean(R.mipmap.ic_launcher, "增加的内容"  +i));
i++;
}
});
}
}

HelloBean.java

package cn.wuxiaocheng.notifydatasetchanged;

public class HelloBean {

private int icon;
private String textView;

public HelloBean(int icon, String textView) {
this.icon = icon;
this.textView = textView;
}

public int getIcon() {
return icon;
}

public void setIcon(int icon) {
this.icon = icon;
}

public String getTextView() {
return textView;
}

public void setTextView(String textView) {
this.textView = textView;
}
}

HelloAdapter.java

package cn.wuxiaocheng.notifydatasetchanged;

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 java.util.LinkedList;

public class HelloAdapter extends BaseAdapter {

private LinkedList<HelloBean> mData;
private Context mContext;

public HelloAdapter(LinkedList<HelloBean> mData, Context mContext){
this.mData = mData;
this.mContext = mContext;
}

@Override
public int getCount() {
return mData.size();
}

@Override
public Object getItem(int position) {
return mData.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder = null;
if (convertView == null){
convertView = LayoutInflater.from(mContext).inflate(R.layout.item_list, parent, false);
viewHolder = new ViewHolder();
viewHolder.imageView = (ImageView) convertView.findViewById(R.id.itemIcon);
viewHolder.textView = (TextView) convertView.findViewById(R.id.itemText);
convertView.setTag(viewHolder);
}else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.imageView.setImageResource(mData.get(position).getIcon());
viewHolder.textView.setText(mData.get(position).getTextView());
return convertView;
}
private class ViewHolder{
ImageView imageView;
TextView textView;
}
public void add(HelloBean data){
if (mData == null) {
mData = new LinkedList<>();
}
mData.add(data);
//删除的话用remove
notifyDataSetChanged();
}
}

运行效果如下



源码下载