我有一个应用程序从XML文件中选择数据，通过ListView显示它们。但是在列表中的一个elemrny和另一个elemrny之间有很多空间。这是我的班级
package com.example.giacomob.myapplication;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Giacomo B on 05/08/2015.
*/
public class Page1 extends Activity {
// private ArrayList<String> data = new ArrayList<String>();
final int n_campi = 8; //definisco la costante del numero di campi per fermata
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_page1);
String dato1 = getIntent().getExtras().getString("NomeDati1"); //preleva la stringa
Toast.makeText(this, dato1, Toast.LENGTH_SHORT).show(); //PROVA: questo mi fa comparire una specie di label notifica trasparente con il valore di "data1"
Log.d("TAG", "data1:" + dato1); //credo sia una specie di debug
// seconda stringa
String destination_nf = getIntent().getExtras().getString("Destinazione_scelta");
String destination_f = destination_nf.trim(); //tolgo gli spazi a inzio e fine
String destination = destination_f.substring(0, 1).toUpperCase() + destination_f.substring(1,destination_f.length()).toLowerCase(); //Faccio in modo che l'utente mi passi una stringa con prima maiuscola e le altre minuscole
Toast.makeText(this, destination, Toast.LENGTH_SHORT).show();
// String salve = getIntent().getExtras().getString("ciao");
int c=0, j=0, n=0;
boolean verify = false;
//FARE CONTROLLO IN CASO IL FILE XML E' VUOTO E QUINDI LA STRINGA E' VUOTA
String[] arr = dato1.split("\\|");
for (int i = 0; i < arr.length; i++) {
System.out.println(i + " => " + arr[i]);
}
final ArrayList<String> listp = new ArrayList<String>();
for (int i=3; i<arr.length-1; i=i+n_campi) {
if(arr[i].equals(destination)) {
System.out.println(i + " des " + arr[i]);
for(; j<n_campi+c; j++)
if(j==0+c) {
n++;
listp.add("Informazioni fermata numero " +n);
listp.add("Coordinata X: " + arr[j]);
}
else if(j==1+c)
listp.add("Coordinata Y: " + arr[j]);
else if (j==2+c)
listp.add("Nazione di destinazione: " + arr[j]);
else if (j==3+c)
listp.add("Paese di destinazione: " + arr[j]);
else if (j==4+c)
listp.add("Via di destinazione: " + arr[j]);
else if (j==5+c)
listp.add("Id Corriera: " + arr[j]);
else if (j==6+c)
listp.add("Paese Fermata: " + arr[j]);
else if (j==7+c) {
listp.add("Via fermata: " + arr[j]);
listp.add(" ");
}
verify = true;
}
else
{
j=j+n_campi;
}
c = j;
}
if(verify == false)
Toast.makeText(this,"Non sono stati trovati mezzi per " + destination, Toast.LENGTH_SHORT).show();
final ListView mylist = (ListView) findViewById(R.id.listView1);
mylist.setAdapter(new MyListAdaper(this, R.layout.activity_page1, listp));
Button b_load = (Button) findViewById(R.id.button_send2);
b_load.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Intent openTrack = new Intent(Page1.this, Track.class);
//String ciao = "ahahah";
//String data1 = ReadXMLFile.readXMLFile(Page1.this);
openTrack.putExtra("Destination", getIntent().getExtras().getString("NomeDati1"));
startActivity(openTrack);
}
});
System.out.println("ciao"+listp.size());
}
private class MyListAdaper extends ArrayAdapter<String> {
private int layout;
public MyListAdaper(Context context, int resource, List<String> objects) {
super(context, resource, objects);
layout = resource;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder mainViewHolder = null;
System.out.println("position " + position); //IS THE REAL POSITION
// if(convertView == null ){
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(layout, parent, false);
ViewHolder viewHolder = new ViewHolder();
// viewHolder.thumbnail = (ImageView) convertView.findViewById(R.id.list_item_thumbnail)
viewHolder.title = (TextView) convertView.findViewById(R.id.textView2);
viewHolder.button = (Button) convertView.findViewById(R.id.button_send2);
if (position != 0 && position % 9 == 0) {
viewHolder.button.setVisibility(View.VISIBLE);
// viewHolder.title.setVisibility(View.VISIBLE);
} else {
viewHolder.button.setVisibility(View.GONE);
//viewHolder.title.setVisibility(View.GONE);
}
System.out.println("positionMiddle " + position); //APPEARS ONLY 2 TIMES WITH 0 AND 1
viewHolder.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("position2 " + position); // IS ONLY 0 OR 1
Toast.makeText(getContext(), "Bottone cliccato" + position, Toast.LENGTH_SHORT).show();
}
});
convertView.setTag(viewHolder);
// }
// else {
mainViewHolder = (ViewHolder) convertView.getTag();
mainViewHolder.title.setText(getItem(position));
//}
// }
return convertView;
}
}
public class ViewHolder {
//ImageView thumbnail; //forse non serve
TextView title;
Button button;
}
}
这是我的活动：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1">
<TextView
android:layout_width="350dp"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/string_destination"
android:id="@+id/textView2"
android:layout_gravity="center_horizontal"
/>
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="359dp"
android:layout_below="@+id/textList"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/string_loadfermata"
android:id="@+id/button_send2"
android:layout_gravity="center_horizontal"
android:onClick="sendMessage"/>
</LinearLayout>
这是我的问题的一个例证： http://i.imgur.com/32sGcxx.jpg
答案 0 :(得分：0)
在您的活动布局文件中，您已设置＆＃39; layout_height＆＃39; ListView的属性为＆＃39; 359dp＆＃39;，这是您在图片1和3中出现问题的原因。要解决此问题，请更改＆＃39; layout_height＆＃39; to＆＃39; wrap_content＆＃39;。
对于图片2，我猜你可能犯了同样的错误。你能展示一下列表项的布局文件吗？
答案 1 :(得分：0)
您应该使用RelativeLayout替换LinearLayout，然后为ListView设置minHeight和maxHeight，以便适合您的屏幕。并使用按钮，添加display_below字段，其id为ListView的id。
答案 2 :(得分：0)
您忘记附加行布局了。你能否附上listview行布局，可能是该文件中的问题。
