问题
I am trying to create a list item which consists of two list item on above the other. The code I am using is this:
package com.example.list2;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ListView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView lv1=(ListView)findViewById(R.id.listView1);
Level data[] = new Level[]
{
new Level("Heading 1", "Subheading 1"),
new Level("Heading 2", "Subheading 2"),
new Level("Heading 3", "Subheading 3")
};
LevelAdapter adp=new LevelAdapter(this, R.layout.list_item, data);
lv1.setAdapter(adp);
}
@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;
}
}
the level.java file is this:
package com.example.list2;
public class Level {
//public int icon;
public String title;
public String title2;
public Level()
{
super();
}
public Level(String title,String title2) {
super();
//this.icon = icon;
this.title = title;
this.title2=title2;
}
}
the leveladapter is this
package com.example.list2;
import android.app.Activity;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class LevelAdapter extends ArrayAdapter<Level> {
static Context context;
static int layoutResourceId;
Level data[] = null;
public LevelAdapter(Context context, int layoutResourceId, Level[] data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
WeatherHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
//row.setMinimumHeight(200);
holder = new WeatherHolder();
// holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
holder.txtTitle2 = (TextView)row.findViewById(R.id.txtTitle2);
row.setTag(holder);
}
else
{
holder = (WeatherHolder)row.getTag();
}
Level weather = data[position];
holder.txtTitle.setText(weather.title);
// holder.imgIcon.setImageResource(weather.icon);
return row;
}
static class WeatherHolder
{
// ImageView imgIcon;
TextView txtTitle;
TextView txtTitle2;
// ImageView imgIcon2;
}
}
the list item layout is this
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp">
<TextView android:id="@+id/txtTitle"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical"
android:textStyle="bold"
android:textSize="22sp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:padding="50dip"
android:textColor="#736F6E"
android:layout_alignParentLeft="true"
android:textAppearance="@android:attr/textAppearanceLarge"
/>
<TextView
android:id="@+id/txtTitle2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_vertical"
android:layout_below="@id/txtTitle"
android:textStyle="bold"
android:textSize="12sp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:padding="50dip"
android:textColor="#736F6E"
android:layout_alignParentLeft="true"
android:textAppearance="@android:attr/textAppearanceLarge"
/>
</RelativeLayout>
and finally the layout for the main activity is this
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ListView
android:id="@+id/listView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:dividerHeight="1dp"
/>
</RelativeLayout>
In the output, all i get is a list item which has a very large height, but only the headings get displayed and not the subheadings. Where am i going wrong? Thanks
回答1:
Well, I narrowed the list item XML dimensions to:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="10dp" >
<TextView
android:id="@+id/txtTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginBottom="2dp"
android:layout_marginTop="2dp"
android:gravity="center_vertical"
android:padding="2dip"
android:textAppearance="@android:attr/textAppearanceLarge"
android:textColor="#736F6E"
android:textSize="22sp"
android:textStyle="bold" />
<TextView
android:id="@+id/txtTitle2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/txtTitle"
android:layout_marginBottom="2dp"
android:layout_marginTop="2dp"
android:gravity="center_vertical"
android:padding="2dip"
android:textAppearance="@android:attr/textAppearanceLarge"
android:textColor="#736F6E"
android:textSize="12sp"
android:textStyle="bold" />
</RelativeLayout>
and in LevelAdapter#getView, just before return row I've added: holder.txtTitle2.setText(weather.title2);
The result is below image file:
Is that what you're trying to achieve? I am not mentioning other improvements as removing static fields from LevelAdapter.
来源：https://stackoverflow.com/questions/17788776/android-how-to-create-a-multiline-list-view