ListView的用法

[易百洋]

ListView的用法 我按着书中代码写的，但是在模拟器中打开的时候出错 只要一打开就显示 很抱歉，已停止运行！
代码如下：

<?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" >
    <ListView 
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        ></ListView>
    

</LinearLayout>

<?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" >
    <ImageView 
        android:name="@+id/fruit_image"
        android:layout_width="wrap_content"
   		android:layout_height="wrap_content" />
    
    <TextView 
        android:name="@+id/fruit_name"
        android:layout_width="wrap_content"
   		android:layout_height="wrap_content"
   		android:layout_gravity="center"
   		android:layout_marginLeft="10dip"
        />
    

</LinearLayout>

package com.eby.listviewtest;

public class Fruit {
	private String name;
	private int imageId;
	public Fruit(String name,int imageId)
	{
		this.name=name;
		this.imageId=imageId;
	}
	public String getName()
	{
		return name;
	}
	public int getImageId()
	{
		return imageId;
	}
}

package com.eby.listviewtest;

import java.util.List;
import android.annotation.SuppressLint;
import android.content.Context;
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 FruitAdapter extends ArrayAdapter<Fruit> {
	private int resourceId;
	public FruitAdapter(Context context, int resource, List<Fruit> objects) {
		super(context, resource, objects);
		// TODO 自动生成的构造函数存根
		resourceId=resource;
	}
	@SuppressLint("ViewHolder")
	@Override
	public View getView(int position,View convertView,ViewGroup parent)
	{
		Fruit fruit = getItem(position);
		View view = LayoutInflater.from(getContext()).inflate(resourceId, null);
		ImageView fruitImage = (ImageView)view.findViewById(R.id.fruit_image);
		TextView fruitName = (TextView)view.findViewById(R.id.fruit_name);
		fruitImage.setImageResource(fruit.getImageId());
		fruitName.setText(fruit.getName());
		return view;
	}
}

package com.eby.listviewtest;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.widget.ListView;

public class MainActivity extends Activity {
	private List<Fruit> fruitList = new ArrayList<Fruit>();
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.main_layout);
		initFruits();
		FruitAdapter adapter = new FruitAdapter(MainActivity.this,R.layout.fruit_item,fruitList);
		ListView listView= (ListView) findViewById(R.id.list_view);
		listView.setAdapter(adapter);
	}
	private void initFruits() {
		Fruit apple = new Fruit("Apple",R.drawable.apple);
		fruitList.add(apple);
		Fruit banana = new Fruit("Banana",R.drawable.banana);
		fruitList.add(banana);
		Fruit orange = new Fruit("Orange",R.drawable.orange);
		fruitList.add(orange);
		Fruit watermelon = new Fruit("Watermelon",R.drawable.watermelon);
		fruitList.add(watermelon);
		Fruit pear = new Fruit("Pear",R.drawable.pear);
		fruitList.add(pear);
		Fruit grape = new Fruit("Grape",R.drawable.grape);
		fruitList.add(grape);
		Fruit pineapple = new Fruit("Pineapple",R.drawable.pineapple);
		fruitList.add(pineapple);
		Fruit cherry = new Fruit("Cherry",R.drawable.cherry);
		fruitList.add(cherry);
	}
}

谁能告诉我哪里错了吗，谢谢了啊！

[xing880307]

用reclyclerView吧

[passself]

getContext() 为null , new adapter 的时候需要从外部传进来

[易百洋]

引用 3 楼 qq_34653481 的回复:

View view = LayoutInflater.from(getContext()).inflate(resourceId, null);
改成

convertView = LayoutInflater.from(getContext()).inflate(resourceId, null);


最后return的也是 convertView

还是不行啊、

[易百洋]

logcat显示的这个错误

[可乐加冰才好喝]

View view = LayoutInflater.from(getContext()).inflate(resourceId, null);
改成

convertView = LayoutInflater.from(getContext()).inflate(resourceId, null);


最后return的也是 convertView

[「已注销」]

没有上下文context

[秃头地中海]

private Context mContext;
	public FruitAdapter(Context context, int resource, List<Fruit> objects) {
		super(context, resource, objects);     
		this.resourceId=resource;  
		this.mContext = context;		
	}

还有就是3楼所说的一并改掉

[SDYYY_FAN]

书上原本的代码是酱紫的： public View getView(int position, View convertView, ViewGroup parent) { Fruit fruit = getItem(position); View view; ViewHolder viewHolder; if (convertView == null) { view = LayoutInflater.from(getContext()).inflate(resourceId, null); viewHolder = new ViewHolder(); viewHolder.fruitImage = (ImageView) view.findViewById(R.id.fruit_image); viewHolder.fruitName = (TextView) view.findViewById(R.id.fruit_name); view.setTag(viewHolder); } else { view = convertView; viewHolder = (ViewHolder) view.getTag(); } viewHolder.fruitImage.setImageResource(fruit.getImageId()); viewHolder.fruitName.setText(fruit.getName()); return view; } class ViewHolder { ImageView fruitImage; TextView fruitName; }