listview
MainActivity
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ListView; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends Activity { private List<Fruit> fruitList = new ArrayList<Fruit>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initFruits(); // 初始化水果数据 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.ic_launcher_background); fruitList.add(apple); Fruit banana = new Fruit("Banana", R.drawable.ic_launcher_background); fruitList.add(banana); Fruit orange = new Fruit("Orange", R.drawable.ic_launcher_background); fruitList.add(orange); Fruit watermelon = new Fruit("Watermelon", R.drawable.ic_launcher_background); fruitList.add(watermelon); Fruit pear = new Fruit("Pear", R.drawable.ic_launcher_background); fruitList.add(pear); Fruit grape = new Fruit("Grape", R.drawable.ic_launcher_background); fruitList.add(grape); Fruit pineapple = new Fruit("Pineapple", R.drawable.ic_launcher_background); fruitList.add(pineapple); Fruit strawberry = new Fruit("Strawberry", R.drawable.ic_launcher_background); fruitList.add(strawberry); Fruit cherry = new Fruit("Cherry", R.drawable.ic_launcher_background); fruitList.add(cherry); Fruit mango = new Fruit("Mango", R.drawable.ic_launcher_background); fruitList.add(mango); } }
FruitAdapter
package com.example.myapplication; 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 androidx.annotation.NonNull; import androidx.annotation.Nullable; import java.util.List; public class FruitAdapter extends ArrayAdapter { private int resourceId = 0; public FruitAdapter(@NonNull Context context, int resource, @NonNull List<Fruit> objects) { super(context, resource, objects); resourceId = resource; } @NonNull @Override public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { Fruit 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; } }
Fruit
package com.example.myapplication; public class Fruit { private String name; private int imageId; public Fruit(String name, int imageId) { this.name = name; this.imageId = imageId; } public Fruit() { } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getImageId() { return imageId; } public void setImageId(int imageId) { this.imageId = imageId; } @Override public String toString() { return "Fruit{" + "name='" + name + '\'' + ", imageId='" + imageId + '\'' + '}'; } }
fruit_item
<?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"> <ImageView android:id="@+id/fruit_image" android:layout_width="wrap_content" android:layout_height="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" /> </LinearLayout>
activity_main
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.myapplication.MainActivity"> <ListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/list_view" > </ListView> </LinearLayout>