确保您的适配器正确实现了所有必需的方法,并且您正确传递了数据到适配器中。以下是一个基本的适配器示例,用于将字符串数组展示在ListView中:
public class MyAdapter extends ArrayAdapter
private Context mContext; private String[] mValues;
public MyAdapter(Context context, String[] values) { super(context, R.layout.row_layout, values); this.mContext = context; this.mValues = values; }
@Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.row_layout, parent, false);
TextView textView = rowView.findViewById(R.id.label);
textView.setText(mValues[position]);
return rowView;
} }
确保你的布局文件正确地定义了你要展示的视图。例如,如果你在适配器中使用了R.layout.row_layout,那么你的row_layout.xml文件应该是这样的:
请确保您正确设置了ListView,例如正确设置了id和适配器。以下是一个设置ListView的示例:
public class MainActivity extends AppCompatActivity {
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
ListView listView = findViewById(R.id.list_view);
String[] values = new String[] {"apple", "banana", "