ListView

Fruit實體類

FruitAdapter.java

public class FruitAdapter extends ArrayAdapter<Fruit> {    private int resourceId;    public FruitAdapter(Context context, int textViewResourceId,                        List<Fruit> objects) {        super(context, textViewResourceId, objects);        resourceId = textViewResourceId;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        Fruit fruit = getItem(position); // 獲取當前項的Fruit實例        View view;        ViewHolder viewHolder;        if (convertView == null) {            view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false);            viewHolder = new ViewHolder();            viewHolder.fruitImage = (ImageView) view.findViewById (R.id.fruit_image);            viewHolder.fruitName = (TextView) view.findViewById (R.id.fruit_name);            view.setTag(viewHolder); // 將ViewHolder存儲在View中        } else {            view = convertView;            viewHolder = (ViewHolder) view.getTag(); // 重新獲取ViewHolder        }        viewHolder.fruitImage.setImageResource(fruit.getImageId());        viewHolder.fruitName.setText(fruit.getName());        return view;    }    class ViewHolder {        ImageView fruitImage;        TextView fruitName;    }}

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fruit_item.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:andro    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <ImageView        android:        android:layout_width="wrap_content"        android:layout_height="wrap_content">    </ImageView>    <TextView        android:        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:layout_gravity="center_vertical"        android:layout_marginLeft="10dp" /></LinearLayout>

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activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:andro    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ListView        android:        android:layout_width="match_parent"        android:layout_height="match_parent" >    </ListView></LinearLayout>

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MainActivity

public class MainActivity extends AppCompatActivity {private List<Fruit> fruitList=new ArrayList<>();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //初始化水果數據        initfruits();        FruitAdapter adapter=new FruitAdapter(MainActivity.this,R.layout.fruit_item,fruitList);        ListView listView=(ListView) findViewById(R.id.list_view);        listView.setAdapter(adapter);        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                Fruit fruit=fruitList.get(position);                Toast.makeText(MainActivity.this,fruit.getName(),Toast.LENGTH_SHORT).show();            }        });    }    private  void initfruits()    {        for(int i=0;i<2;i++)        {            Fruit apple=new Fruit("Apple",R.drawable.apple_pic);            fruitList.add(apple);            Fruit banana = new Fruit("Banana", R.drawable.banana_pic);            fruitList.add(banana);            Fruit orange = new Fruit("Orange", R.drawable.orange_pic);            fruitList.add(orange);            Fruit watermelon = new Fruit("Watermelon", R.drawable.watermelon_pic);            fruitList.add(watermelon);            Fruit pear = new Fruit("Pear", R.drawable.pear_pic);            fruitList.add(pear);            Fruit grape = new Fruit("Grape", R.drawable.grape_pic);            fruitList.add(grape);            Fruit pineapple = new Fruit("Pineapple", R.drawable.pineapple_pic);            fruitList.add(pineapple);            Fruit strawberry = new Fruit("Strawberry", R.drawable.strawberry_pic);            fruitList.add(strawberry);            Fruit cherry = new Fruit("Cherry", R.drawable.cherry_pic);            fruitList.add(cherry);            Fruit mango = new Fruit("Mango", R.drawable.mango_pic);            fruitList.add(mango);        }    }}

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