java - ListView CustomAdapter 不显示第一个位置结果

Question

我是 Android Studio 和一般编码的新手，我正在尝试显示带有颜色图像和颜色名称的自定义 ListView。我使用了一个自定义适配器来使用两个包含可绘制图像颜色和名称字符串的数组来扩展 View 。

我遇到的问题 - 自定义适配器仅显示位置 1 及以后的图层。例如，第一层应该是 img_01 和“红色” - 它正在显示 img_02 和“橙色”。

我尝试调试代码，似乎虽然适配器正在设置位置 0 的值，但我找不到它不显示的原因(因为其他适配器显示正常)。

图像和名称只是占位符，因此不包含可绘制对象和名称的替代解决方案是不可行的，

提前谢谢

自定义适配器.java

public class CustomAdapter extends BaseAdapter {

    Context context;
    int[] images;
    String[] colour;
    LayoutInflater mInflater;

    public CustomAdapter(Context c, int[] i, String[] col) {
        this.context = c; //sets the application context that has been passed to the adapter
        this.images = i; //sets the images array that has been passed to the adapter
        this.colour = col; //sets the colour array that has been passed to the adapter
        mInflater = (LayoutInflater.from(context)); //sets the layout inflater from context
    }

    @Override
    public int getCount() { //total number of elements in the array
        return images.length;
    }

    @Override
    public Object getItem(int position) { //gets the item using the position
        return null;
    }

    @Override
    public long getItemId(int position) { //gets the item position
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) { //this is used to update the view

        convertView = mInflater.inflate(R.layout.custom_layout, null);

        ImageView image = convertView.findViewById(R.id.imageView);

        TextView text = convertView.findViewById(R.id.textView);

        text.setText(colour[position]);
        image.setImageResource(images[position]);
        return convertView;

    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

    ListView mListView;

    int[] images = {R.drawable.img01,
    R.drawable.img02,
    R.drawable.img03,
    R.drawable.img04};

    String[] colour = {"Red",
    "Orange",
    "Yellow",
    "Green"};

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

        mListView = findViewById(R.id.listView);

        CustomAdapter customAdapter = new CustomAdapter(getApplicationContext(), images, colour);
        //passes information of images and application context to the item adapter
        mListView.setAdapter(customAdapter);
        //sets the adapter to the listview

    }
}

自定义布局.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent" android:layout_height="match_parent">


    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="7dp"
        android:layout_marginLeft="7dp"
        android:layout_marginTop="9dp"
        app:srcCompat="@drawable/img01" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginStart="99dp"
        android:layout_marginLeft="99dp"
        android:layout_marginTop="36dp"
        android:text="colourName" />

</RelativeLayout>

activity_main.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=".MainActivity">

    <ListView
        android:id="@+id/listView"
        android:layout_width="409dp"
        android:layout_height="729dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

尝试将 ListView 的高度设置为 wrap_content 而不是对其进行硬编码

<ListView
    ...
    android:layout_height="wrap_content"/>