我创建了自定义列表，但是当我运行它时，应用程序崩溃，其中有什么问题，请告诉我。我想在功能上，当我按下“+”按钮时，它会将 EditText 的计数增加一，当我按下“-”按钮时，它会将 EditText 的计数减少一..任何人都告诉我有什么问题使用这段代码。创建自定义列表..
列出 XML 文件
<RelativeLayout 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"
tools:context=".MainActivity" >
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
</RelativeLayout>
容器 XML 文件，其中包含按钮等
<?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="vertical" >
<TextView
android:id="@+id/tvTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="1kg" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="5" >
<Button
android:id="@+id/btnSubtract "
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="-" />
<EditText
android:id="@+id/etQuantity"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="3"
android:ems="10"
android:inputType="number" >
<requestFocus />
</EditText>
<Button
android:id="@+id/btnAdd"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="+" />
</LinearLayout>
</LinearLayout>
主要的java类
package com.example.custoplist;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends ListActivity {
String[] itemsList= {"1/2 kg","1 kg", "5 kg", "10 kg", "16 kg"};
String[] itemQuantity = new String[5];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setListAdapter(new MyAdapter(this, android.R.layout.simple_list_item_1,android.R.id.text1,itemsList));
}
private class MyAdapter extends ArrayAdapter<String>{
public MyAdapter(Context context, int resource, int textViewResourceId,
String[] objects) {
super(context, resource, textViewResourceId, objects);
// TODO Auto-generated constructor stub
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
//return super.getView(position, convertView, parent);
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.content, parent, false);
TextView tvTitle = (TextView) findViewById(R.id.tvTitle);
EditText etQuantity = (EditText) findViewById(R.id.etQuantity);
Button btnAdd = (Button) findViewById(R.id.btnAdd);
Button btnsSubtract = (Button) findViewById(R.id.btnSubtract);
tvTitle.setText(itemsList[position]);
return row;
}
}
}