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package com.example.samsa;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.preference.PreferenceActivity.Header;
import android.util.Log;
import android.widget.ListView;
import android.widget.TextView;
public class emaginfo extends Activity {
private DBHelper dbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
ListView listView;
TextView textView;
super.onCreate(savedInstanceState);
setContentView(R.layout.emaginfo);
// 通过Activity.getIntent()获取当前页面接收到的Intent。
dbHelper=new DBHelper(this);
dbHelper.open();
Intent intent = getIntent();
// getXxxExtra方法获取Intent传递过来的数据
String msg = intent.getStringExtra("code");
listView = (ListView) findViewById(R.id.lstemag);
if (!msg.isEmpty()) {
emaginfoAdapter emadapter = new emaginfoAdapter(this,
getEmaginfo(msg));
listView.setAdapter(emadapter);
}
}
private List<Map<String, String>> getEmaginfo(String codeString) {
List<Map<String, String>> list2 = new ArrayList<Map<String, String>>();
List<magvols> list = dbHelper.getEmagInfoByCode(codeString);
for (magvols m : list) {
Map<String, String> map = new HashMap<String, String>();
map.put("magname", m.magname);
map.put("title", m.title);
map.put("coverimg", m.coverimg);
map.put("bannerimg", m.bannerimg);
Log.v("msgname",m.magname);
Log.v("coverimg", m.coverimg);
list2.add(map);
}
return list2;
}
};
package com.example.samsa;
import java.net.URL;
import java.util.List;
import java.util.Map;
import android.content.Context;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class emaginfoAdapter extends BaseAdapter {
private LayoutInflater mInflater = null;
private List<Map<String, String>> data;
emaginfoAdapter(Context context, List<Map<String, String>> data) {
// 加载布局
this.mInflater = LayoutInflater.from(context);
this.data = data;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = null;
// 如果缓存convertView为空,则需要创建View
if (convertView == null) {
holder = new ViewHolder();
// 根据自定义的Item布局加载布局
convertView = mInflater.inflate(R.layout.emaginfo_list, null);
holder.name = (TextView) convertView.findViewById(R.id.magname);
holder.title = (TextView) convertView.findViewById(R.id.emagtitle);
holder.leftImgView=(ImageView)convertView.findViewById(R.id.left_img_emag);
holder.topImgView=(ImageView)convertView.findViewById(R.id.top_img_emag);
// 将设置好的布局保存到缓存中,并将其设置在Tag里,以便后面方便取出Tag
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText((String) data.get(position).get("magname"));
Uri url_left=Uri.parse((String)data.get(position).get("coverimg"));
Uri url_top=Uri.parse((String)data.get(position).get("bannerimg"));
holder.leftImgView.setImageURI(url_left);
holder.topImgView.setImageURI(url_top);
holder.title.setText((String) data.get(position).get("title"));
return convertView;
}
}
<?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" >
<ListView
android:id="@+id/lstemag"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" >
</ListView>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="vertical"
android:padding="5dp" >
<ImageView
android:id="@+id/top_img_emag"
android:layout_width="fill_parent"
android:layout_height="60dp"
android:layout_margin="5px" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:id="@+id/left_img_emag"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_margin="5px" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/magname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFFFFFFF"
android:textSize="13px" />
<TextView
android:id="@+id/emagtitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFFFFFFF"
android:textSize="13px" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
@Override
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
很明显是这几句出问题,你的getCount()返回空,也就是说列表的数量为Null,getItemId返回0,所以ListView就不显示了,你都没有看清楚1L的代码就敢说自己没问题,仔细点,不要老是盯着getView方法,请把它改成如下:
public class emaginfoAdapter extends BaseAdapter {
private LayoutInflater mInflater = null;
private List<Map<String, String>> data;
emaginfoAdapter(Context context, List<Map<String, String>> data) {
// 加载布局
this.mInflater = LayoutInflater.from(context);
this.data = data;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return data.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = null;
// 如果缓存convertView为空,则需要创建View
if (convertView == null) {
holder = new ViewHolder();
// 根据自定义的Item布局加载布局
convertView = mInflater.inflate(R.layout.emaginfo_list, null);
holder.name = (TextView) convertView.findViewById(R.id.magname);
holder.title = (TextView) convertView.findViewById(R.id.emagtitle);
holder.leftImgView=(ImageView)convertView.findViewById(R.id.left_img_emag);
holder.topImgView=(ImageView)convertView.findViewById(R.id.top_img_emag);
// 将设置好的布局保存到缓存中,并将其设置在Tag里,以便后面方便取出Tag
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText((String) data.get(position).get("magname"));
Uri url_left=Uri.parse((String)data.get(position).get("coverimg"));
Uri url_top=Uri.parse((String)data.get(position).get("bannerimg"));
holder.leftImgView.setImageURI(url_left);
holder.topImgView.setImageURI(url_top);
holder.title.setText((String) data.get(position).get("title"));
return convertView;
}
}
package com.example.samsa;
import java.net.URL;
import java.util.List;
import java.util.Map;
import android.content.Context;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class emaginfoAdapter extends BaseAdapter {
private LayoutInflater mInflater = null;
private List<Map<String, String>> data;
emaginfoAdapter(Context context, List<Map<String, String>> data) {
// 加载布局
this.mInflater = LayoutInflater.from(context);
this.data = data;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return data.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return data.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = null;
// 如果缓存convertView为空,则需要创建View
if (convertView == null) {
holder = new ViewHolder();
// 根据自定义的Item布局加载布局
convertView = mInflater.inflate(R.layout.emaginfo_list, null);
holder.name = (TextView) convertView.findViewById(R.id.magname);
holder.title = (TextView) convertView.findViewById(R.id.emagtitle);
holder.leftImgView=(ImageView)convertView.findViewById(R.id.left_img_emag);
holder.topImgView=(ImageView)convertView.findViewById(R.id.top_img_emag);
// 将设置好的布局保存到缓存中,并将其设置在Tag里,以便后面方便取出Tag
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.name.setText((String) data.get(position).get("magname"));
Uri url_left=Uri.parse((String)data.get(position).get("coverimg"));
Uri url_top=Uri.parse((String)data.get(position).get("bannerimg"));
holder.leftImgView.setImageURI(url_left);
holder.topImgView.setImageURI(url_top);
holder.title.setText((String) data.get(position).get("title"));
return convertView;
}
}