如何将方法设置为数组

Question

我正在尝试显示媒体商店的多列，例如艺术家、专辑、标题等。我能够正确获取 arraylist 中的一列并且它正在工作，但是当我添加另一列时，我得到了所有列在同一个数组列表中，所以我创建了一个类并在该类方法中添加了列。但是我无法在客户适配器中声明它 这是我的代码。

活动主要

    private ArrayList < MediaFileInfo > audioList = new ArrayList < > ();

    private void External() {
        try {
            String[] proj = {
                MediaStore.Audio.Media._ID,
                    MediaStore.Audio.Media.TITLE,
                    MediaStore.Audio.Media.ARTIST,
                    MediaStore.Audio.Media.ALBUM
            }; // Can include more data for more details and check it.

            String selection = MediaStore.Audio.Media.DURATION + ">=90000";

            String[] selectionArgs = null;

            String sortOrder = MediaStore.Audio.Media.TITLE + " ASC";

            Cursor audioCursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, proj, selection, selectionArgs, sortOrder);

            if (audioCursor != null) {
                if (audioCursor.moveToFirst()) {
                    do {
                        int audioTitle = audioCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE);
                        int audioartist = audioCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST);
                        int audioalbum = audioCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM);
                        MediaFileInfo info = new MediaFileInfo();
                        info.setTitle(audioCursor.getString(audioTitle));
                        info.setAlbum(audioCursor.getString(audioalbum));
                        info.setArtist(audioCursor.getString(audioartist));
                        audioList.add(info);
                    } while (audioCursor.moveToNext());
                }
            }
            audioCursor.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

方法类

 public class MediaFileInfo {
     private String title, artist, album;

     public String getTitle() {
         return title;
     }

     public void setTitle(String title) {
         this.title = title;
     }

     public String getArtist() {
         return artist;
     }

     public void setArtist(String artist) {
         this.artist = artist;
     }

     public String getAlbum() {
         return album;
     }

     public void setAlbum(String album) {
         this.album = album;
     }
 }

自定义适配器

public class CustomeAdapter extends ArrayAdapter {
    private ArrayList < MediaFileInfo > audioList = new ArrayList < > ();

    public CustomeAdapter(Context context, int resource) {
        super(context, resource);
    }

    public CustomeAdapter(MainActivity context, ArrayList < MediaFileInfo > audioList) {
        super(context, R.layout.custome_list, audioList);
    }

    @
    Override
    public View getView(int position, View convertView, ViewGroup parent) {

        LayoutInflater imthebest = LayoutInflater.from(getContext());@
        SuppressLint("ViewHolder") View custome = imthebest.inflate(R.layout.custome_list, parent, false);
        MediaFileInfo item = audioList.get(0);
        String item1 = (String) getItem(position);
        TextView text1 = (TextView) custome.findViewById(R.id.textView);
        text1.setText(item1);


        return custome;
    }
}

自定义xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Song name"
    android:id="@+id/textView" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="Artist"
    android:id="@+id/textView2" />
</LinearLayout>

如何将方法设置为数组。我如何获取方法任何示例都会有所帮助

Answer 1

如何将标题和艺术家都添加到您的列表中：

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.custome_list, parent, false);
        }
        MediaFileInfo item = (MediaFileInfo) getItem(position);
        TextView text1 = (TextView) convertView.findViewById(R.id.textView);
        text1.setText(item.getTitle());
        TextView text2 = (TextView) convertView.findViewById(R.id.textView2);
        text2.setText(item.getArtist());


        return convertView;
    }

---

如果您从数据库中获取数据并且有一个Cursor，那么您应该创建一个CursorAdapter 子类。您无需根据数据创建自己的列表。

您需要做的就是覆盖bindView()。 bindView() 会给你一个View 来填写列表项，以及一个Cursor，它已经定位在包含该项目数据的记录中。从游标中获取列数据并在列表项视图中设置子视图是一个简单的操作。