2021年1月25日 列表与适配器

今天完成了列表与适配器的相关操作：

示意图：

                       

Drink：

package bjfu.it.sun.starbuzz;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

public class TopLevelActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_top_level);

     //实现onItemClickListener,点击时打开二级界面
        AdapterView.OnItemClickListener itemClickListener=
                new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> listView, View itemView, int position, long id) {
                        if (position == 0){
                            Intent intent = new Intent(TopLevelActivity.this, DrinkCategoryActivity.class);
                            startActivity(intent);
                        }
                    }
                };
        //为listView注册单机监听器
        ListView listView=findViewById(R.id.list_options);
        listView.setOnItemClickListener(itemClickListener);
    }

}

 DrinkActivity：

package bjfu.it.sun.starbuzz;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

public class TopLevelActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_top_level);

     //实现onItemClickListener,点击时打开二级界面
        AdapterView.OnItemClickListener itemClickListener=
                new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> listView, View itemView, int position, long id) {
                        if (position == 0){
                            Intent intent = new Intent(TopLevelActivity.this, DrinkCategoryActivity.class);
                            startActivity(intent);
                        }
                    }
                };
        //为listView注册单机监听器
        ListView listView=findViewById(R.id.list_options);
        listView.setOnItemClickListener(itemClickListener);
    }

}

DrinkCategoryActivity：

package bjfu.it.sun.starbuzz;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ComponentActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class DrinkCategoryActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_drink_category);


        ArrayAdapter<Drink>listAdpter=new ArrayAdapter<>(
                this, android.R.layout.simple_list_item_1,Drink.drinks);

        ListView listDrinks =findViewById(R.id.list_drinks );
        listDrinks.setAdapter(listAdpter);

        //创建监听器
        AdapterView.OnItemClickListener itemClickListener =
                new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> listDrinks, View itemView, int position, long id) {
                        //pass the drink the user clicks on to DrinkActivity
                        Intent intent =new Intent(DrinkCategoryActivity .this,DrinkActivity.class);
                        intent.putExtra(DrinkActivity.EXTRA_DRINKID,(int)id);
                        startActivity(intent);
                    }
                };
//Assign the linstener to the list view(将linstener指定给列表视图)
        listDrinks.setOnItemClickListener(itemClickListener ) ;
    }
}

TopLevelActivity：

package bjfu.it.sun.starbuzz;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

public class TopLevelActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_top_level);

     //实现onItemClickListener,点击时打开二级界面
        AdapterView.OnItemClickListener itemClickListener=
                new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> listView, View itemView, int position, long id) {
                        if (position == 0){
                            Intent intent = new Intent(TopLevelActivity.this, DrinkCategoryActivity.class);
                            startActivity(intent);
                        }
                    }
                };
        //为listView注册单机监听器
        ListView listView=findViewById(R.id.list_options);
        listView.setOnItemClickListener(itemClickListener);
    }

}

activity_drink.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".DrinkActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/photo"
            android:layout_width="190dp"
            android:layout_height="190dp"
            app:srcCompat="@drawable/logo" />

        <TextView
            android:id="@+id/name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="TextView" />

        <TextView
            android:id="@+id/description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="TextView" />
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

activity_drink_category.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".DrinkCategoryActivity">

    <ListView
        android:id="@+id/list_drinks"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

 activity_top_level.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".TopLevelActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/imageView"
            android:layout_width="200dp"
            android:layout_height="100dp"
            android:contentDescription="@string/starbuuzz_logo"
            android:src="@drawable/logo"
            app:srcCompat="@drawable/logo" />

        <ListView
            android:id="@+id/list_options"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:entries="@array/options" />

    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

<resources>
    <string name="app_name">Starbuzz</string>
    <string name="starbuuzz_logo">Starbuzz logo</string>

    <string-array name="options">
        <item>Drinks</item>
        <item>Food</item>
        <item>Sores</item>
    </string-array>
</resources>

 遇到的问题：当时正要测试程序，但是又打开了另一个应用，给卡住了，最后又重建了一个虚拟机，这样才算好了，明天继续