Android动态加载ListView中的Item【安卓进化二十三】

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分类： android开发 2011-09-18 17:07 2167人阅读评论(5) 收藏举报

listviewandroidlayoutimageclassnull

我这周上网看到动态增加listview的每一项item的布局，今天抽空自己写了一个，方便自己日后使用，这个效果还是很不错的，用到了Adapter的notifyDataSetChanged()方法，当点击每一个Item的时候，就通知adapter更新getView，系统得到通知就相应的加载一遍布局，就达到了动态加载item布局的效果。希望给大家带来点启迪，有问题或想要代码的可以留言，欢迎大家留言谈论listview的一些知识，以求共同进步，转载请标明出处：

http://blog.csdn.net/wdaming1986/article/details/6787455

程序开启界面，默认选中贝贝item，点击晶晶后的界面的效果，

点击欢欢后界面的效果：点击迎迎后界面的效果：

点击妮妮后界面的效果：

代码奉上，真理还得看代码：

在ListViewRunDemo工程中，

com.cn.daming包中的MainActivity.java类中的代码：

[java] view plaincopyprint?

package com.cn.daming;
import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends ListActivity {
private ListAddLayoutAdapter mAdapter;
@SuppressWarnings("unused")
private LayoutInflater lInflater;;
int[] image = {
R.drawable.s_beibei,
R.drawable.s_jingjing,
R.drawable.s_huanhuan,
R.drawable.s_yingying,
R.drawable.s_nini
};
String[] show_name = {
"贝贝",
"晶晶",
"欢欢",
"迎迎",
"妮妮"
};
private int id = 0;
@SuppressWarnings("unused")
private int last = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new ListAddLayoutAdapter(this);
this.setListAdapter(mAdapter);
this.getListView().setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
id = position;
mAdapter.notifyDataSetChanged();
last = position;
}
});
}
public class ListAddLayoutAdapter extends BaseAdapter {
private Context context;
private MainActivity activity;
public ListAddLayoutAdapter(Context context) {
this.context = context;
this.activity = (MainActivity)context;
lInflater = activity.getLayoutInflater();
}
public int getCount() {
return image.length;
}
public Object getItem(int arg0) {
return null;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View arg1, ViewGroup arg2) {
LinearLayout layout = new LinearLayout(context);
layout.setOrientation(LinearLayout.VERTICAL);
layout.setPadding(0, 8, 0, 8);
layout.addView(addTitleView(position));
if(id==position){
layout.addView(addCustomView(position));
}
return layout;
}
public View addTitleView(int i){
LinearLayout layout = new LinearLayout(context);
layout.setOrientation(LinearLayout.HORIZONTAL);
ImageView iv = new ImageView(context);
iv.setImageResource(image[i]);
layout.addView(iv,
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
TextView tv = new TextView(context);
tv.setText(show_name[i]);
tv.setTextSize(18f);
layout.addView(tv,
new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
layout.setGravity(Gravity.CENTER);
return layout;
}
public View addCustomView(int i){
View view = new View(context);
switch(i){
case 0:
ImageView iv1 = new ImageView(context);
iv1.setImageResource(R.drawable.beibei);
view = iv1;
break;
case 1:
ImageView iv2 = new ImageView(context);
iv2.setImageResource(R.drawable.jingjing);
view = iv2;
break;
case 2:
ImageView iv3= new ImageView(context);
iv3.setImageResource(R.drawable.huanhuan);
view = iv3;
break;
case 3:
ImageView iv4 = new ImageView(context);
iv4.setImageResource(R.drawable.yingying);
view = iv4;
break;
case 4:
ImageView iv5 = new ImageView(context);
iv5.setImageResource(R.drawable.nini);
view = iv5;
break;
}
return view;
}
}
}

package com.cn.daming;import android.app.ListActivity;import android.content.Context;import android.os.Bundle;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;public class MainActivity extends ListActivity {private ListAddLayoutAdapter mAdapter;@SuppressWarnings("unused")private LayoutInflater lInflater;;int[] image = {R.drawable.s_beibei,R.drawable.s_jingjing,R.drawable.s_huanhuan,R.drawable.s_yingying,R.drawable.s_nini};String[] show_name = {"贝贝","晶晶","欢欢","迎迎","妮妮"};private int id = 0;@SuppressWarnings("unused")private int last = 0; @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mAdapter = new ListAddLayoutAdapter(this);        this.setListAdapter(mAdapter);               this.getListView().setOnItemClickListener(new OnItemClickListener(){public void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) {id = position;mAdapter.notifyDataSetChanged();last = position;}        });    } public class ListAddLayoutAdapter extends BaseAdapter {private Context context;private MainActivity activity; public ListAddLayoutAdapter(Context context) {this.context = context;this.activity = (MainActivity)context;lInflater = activity.getLayoutInflater();} public int getCount() {return image.length;}public Object getItem(int arg0) {return null;}public long getItemId(int position) {return position;}public View getView(int position, View arg1, ViewGroup arg2) {LinearLayout layout = new LinearLayout(context);        layout.setOrientation(LinearLayout.VERTICAL);        layout.setPadding(0, 8, 0, 8);                layout.addView(addTitleView(position));                if(id==position){        layout.addView(addCustomView(position));        }        return layout;}public View addTitleView(int i){LinearLayout layout = new LinearLayout(context);        layout.setOrientation(LinearLayout.HORIZONTAL);                ImageView iv = new ImageView(context);        iv.setImageResource(image[i]);        layout.addView(iv,        new LinearLayout.LayoutParams(        LinearLayout.LayoutParams.WRAP_CONTENT,         LinearLayout.LayoutParams.WRAP_CONTENT));                        TextView tv = new TextView(context);        tv.setText(show_name[i]);        tv.setTextSize(18f);        layout.addView(tv,        new LinearLayout.LayoutParams(        LinearLayout.LayoutParams.WRAP_CONTENT,         LinearLayout.LayoutParams.WRAP_CONTENT));                layout.setGravity(Gravity.CENTER);        return layout;}public View addCustomView(int i){View view = new View(context);switch(i){case 0:ImageView iv1 = new ImageView(context);iv1.setImageResource(R.drawable.beibei);view = iv1;break;case 1:ImageView iv2 = new ImageView(context);iv2.setImageResource(R.drawable.jingjing);view = iv2;break;case 2:ImageView iv3= new ImageView(context);iv3.setImageResource(R.drawable.huanhuan);view = iv3;break;case 3:ImageView iv4 = new ImageView(context);iv4.setImageResource(R.drawable.yingying);view = iv4;break;case 4:ImageView iv5 = new ImageView(context);iv5.setImageResource(R.drawable.nini);view = iv5;break;    }return view; } }}

说明：也可以动态加载布局文件也可以的：

在addCustomView（）方法中这么写也是可以的：

[java] view plaincopyprint?

<span style="font-size: 16px;">case 1:
view = lInflater.inflate(R.layout.main, null);
break;
</span>

case 1:    view = lInflater.inflate(R.layout.main, null);    break;

工程的图片没有上传，希望大家自己找些图片就可以了：