Android studio 定製 ListView 介面
這篇文章是配套Android 第一行程式碼 第二版使用
3.5.2 定製listView的介面定製。第一要用到上一節中已經建立好的工程,activity_main.xml 中的內容不改變,至於MainActivity中的變化在稍後會說明。
建立一個實體類,在com.example.list 新建Java Class name填寫Fruit 其他不用理會然後點選OK,在新檔案中填入
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; }
}
注意:這裡面都是public 類
下面新建fruit_item.xml 在layout中新建XML檔案填入
<ImageView android:id="@+id/fruit_image" android:layout_height="wrap_content" android:layout_width="wrap_content"/> <TextView android:id="@+id/fruit_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_marginLeft="10dip"/>
兩個控制元件
然後新建一個是個介面卡,新建介面卡在com.example.list 新建Activity 選擇Empty Activity 並把Generate 不勾選 程式碼書上也有我就複製一下
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;
import java.util.List;
public class FruitAdapter extends ArrayAdapter {
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);
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;
}
}
最後就是改一下主活動了,主活動行程式碼
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private List<Fruit> fruitList = new ArrayList<Fruit>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
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 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() {
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);
}
}
貼上這兩打段程式碼主要是想讓大家參考一下標頭檔案,很多時候的報錯就是因為標頭檔案沒有新增完整。每個函式的功能我就不贅述了,先要《第一程式碼 Android 》第二版 郭霖著 的留下郵箱免費發給你們,就不收什麼積分了。