當我使用ArrayList自定義適配器在列表視圖中列出圖像時，代碼沒有顯示任何錯誤。問題是，在使用代碼時，只有我最后輸入的數據在列表視圖中顯示。為什么不能查看之前輸入的數據？我的活動課：public class SocialActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_social);        String json;        ImageView babu = (ImageView) findViewById(R.id.babu);        ListView lvsoc = (ListView) findViewById(R.id.list_social);        LinearLayout l1 = (LinearLayout) findViewById(R.id.layhead);        LayoutInflater inflater = null;        ArrayList<SubjectData> arrayList = new ArrayList<SubjectData>();        ArrayAdapter<SubjectData> a;        /*ArrayList<String> allcategory = new ArrayList<>();        ArrayList<String> allcategory1 = new ArrayList<>();        ArrayList<String> img = new ArrayList<>();        ArrayList<String> img1 = new ArrayList<>();*/        arrayList.add(new SubjectData("JAVA", "https://www.tutorialspoint.com/java/", "https://s18955.pcdn.co/wp-content/uploads/2017/11/Facebook-share-icon.png"));        arrayList.add(new SubjectData("Python", "https://www.tutorialspoint.com/python/", "https://www.tutorialspoint.com/python/images/python-mini.jpg"));        /*arrayList.add(new SubjectData("Javascript", "https://www.tutorialspoint.com/javascript/", "https://www.tutorialspoint.com/javascript/images/javascript-mini-logo.jpg"));        arrayList.add(new SubjectData("Cprogramming", "https://www.tutorialspoint.com/cprogramming/", "https://www.tutorialspoint.com/cprogramming/images/c-mini-logo.jpg"));        arrayList.add(new SubjectData("Cplusplus", "https://www.tutorialspoint.com/cplusplus/", "https://www.tutorialspoint.com/cplusplus/images/cpp-mini-logo.jpg"));