建立自定義Adapter命名為TestAdapter

public class TestAdapter extends BaseAdapter {
    private Context mContent;
    private List<Fruit> mData;

    public TestAdapter(Context context, List<Fruit> data) {
        this.mContent = context;
        this.mData = data;
    }

    @Override
    public int getCount() {
        return mData== null? 0 :mData.size();
    }

    @Override
    public Object getItem(int position) {
        return mData.get(position);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int possition, View view, ViewGroup viewGroup) {
        ViewHolde viewHodle;
        if (view == null) {
            viewHodle = new ViewHolde();
            view = LayoutInflater.from(mContent).inflate(R.layout.item,viewGroup,false);
            viewHodle.imageView = view.findViewById(R.id.image);
            viewHodle.name = view.findViewById(R.id.name);
            viewHodle.size = view.findViewById(R.id.size);
            viewHodle.button = view.findViewById(R.id.button);
            view.setTag(viewHodle);
        }else {
            viewHodle = (ViewHolde) view.getTag();
        }
        final  Fruit fruit = mData.get(possition);
        viewHodle.name.setText(fruit.getName());
        viewHodle.imageView.setImageResource(fruit.getImageId());
        viewHodle.size.setText(fruit.getSize());
        viewHodle.button.setText(fruit.getButtonText());
        viewHodle.button.setTag(possition);
        viewHodle.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //TODO  點選事件
                switch ((Integer) view.getTag()){
                    case 0:
                        Util.showToast(mContent,"1");
                        break;
                    case 1:
                        Util.showToast(mContent,"2");
                        break;
                    case 2:
                        Util.showToast(mContent,"3");
                        break;
                }

            }
        });

        return view;
    }

    class ViewHolde {
        ImageView imageView;
        TextView name;
        TextView size;
        Button button;
    }


}

 

當view為空的時候，建立一個ViewHolder物件，並將控制元件的例項都存放在ViewHolder裡，然後呼叫View的setTag()方法，將ViewHolder物件儲存在View中。當convertView不為空的時候則呼叫View的getTag()方法，把ViewHolder重新取出。這樣所有控制元件的例項都快取在了ViewHolder裡，就沒有必要每次都通過findViewById()方法來獲取控制元件例項了。

MainActivity檔案

public class MainActivity extends AppCompatActivity {
    private List<Fruit> DataList = new ArrayList<Fruit>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_listview);
        initDataList(); // 初始化
        TestAdapter adapter = new TestAdapter(MainActivity .this,DataList);
        ListView listView = (ListView) findViewById(R.id.list_view_2);
        listView.setAdapter(adapter);
    }

    private void initDataList() {
        Fruit a = new Fruit("王者農藥", R.drawable.log,"下載","10m");
        DataList.add(a);
        Fruit b = new Fruit("吃雞戰場",R.drawable.log2,"下載","20m");
        DataList.add(b);
        Fruit c = new Fruit("氪金", R.drawable.log3,"下載","30m");
        DataList.add(c);
    }

}
 

my_listview.xml檔案

<?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">
    <ListView
        android:id="@+id/list_view_2"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>
 

item.xml檔案

<?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="wrap_content"
    android:orientation="horizontal"
    android:descendantFocusability="blocksDescendants">
    <ImageView
        android:id="@+id/image"
        android:src="@drawable/log"
        android:layout_width="70dp"
        android:layout_height="70dp"
        />
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="5dp"
        android:layout_weight="3">
        <TextView
            android:id="@+id/name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_marginTop="2dp"
            android:text="亂鬥堂"
            android:textColor="#130000"
            android:textSize="18dp"/>
        <TextView
            android:id="@+id/size"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="5dp"
            android:textColor="#93851f"
            android:text="65M"
            android:textSize="20dp"/>
    </LinearLayout>
    <Button
        android:layout_weight="1"
        android:id="@+id/button"
        android:layout_marginTop="12dp"
        android:layout_width="40dp"
        android:layout_height="50dp"
        android:text="下載"
        android:textSize="20dp"/>

</LinearLayout>

Android_listview設定每條資訊的間距

設定listView的item間距，可以在xml佈局檔案中的listView下設定xml屬性：
android:divider="#00000000"
android:dividerHeight=“18dp”
解釋：分隔線透明，高度為18dp。