Android 自定义ListVIew不显示,显示的是空屏幕
当列表中没有项目时,不会显示空视图。有什么问题 主要活动 包com.example.android.customadapterAndroid 自定义ListVIew不显示,显示的是空屏幕,android,listview,custom-adapter,Android,Listview,Custom Adapter,当列表中没有项目时,不会显示空视图。有什么问题 主要活动 包com.example.android.customadapter public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setConte
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<Players> objects = new ArrayList<>();
objects.add(new Players("Shikhar Dhawan",R.drawable.shikhar));
objects.add(new Players("Virat Kohli",R.drawable.kohli));
}
}
public class Players {
private String mName;
private int image;
Players(String name,int res)
{
mName = name;
image = res;
}
public String getName()
{
return mName;
}
public int getImage()
{
return image;
}
}
自定义适配器类
包com.example.android.customadapter
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<Players> objects = new ArrayList<>();
objects.add(new Players("Shikhar Dhawan",R.drawable.shikhar));
objects.add(new Players("Virat Kohli",R.drawable.kohli));
}
}
public class Players {
private String mName;
private int image;
Players(String name,int res)
{
mName = name;
image = res;
}
public String getName()
{
return mName;
}
public int getImage()
{
return image;
}
}
我的自定义数组列表适配器
public class CustomAdapter extends ArrayAdapter<Players> {
public CustomAdapter(@NonNull Context context, @LayoutRes int resource, @NonNull ArrayList<Players> objects) {
super(context, resource, objects);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View v = convertView;
if(v==null)
{
v = LayoutInflater.from(getContext()).inflate(R.layout.list_item,parent,false);
}
Players p = getItem(position);
TextView t = (TextView)v.findViewById(R.id.miwok_text_view);
t.setText(p.getName());
ImageView i = (ImageView)v.findViewById(R.id.image);
i.setImageResource(p.getImage());
return v;
}
}
公共类CustomAdapter扩展了ArrayAdapter{
公共CustomAdapter(@NonNull上下文上下文、@LayoutRes int-resource、@NonNull ArrayList对象){
超级(上下文、资源、对象);
}
@非空
@凌驾
公共视图getView(int位置,@Nullable视图convertView,@NonNull视图组父级){
视图v=转换视图;
如果(v==null)
{
v=LayoutInflater.from(getContext()).flate(R.layout.list_项,父项,false);
}
玩家p=getItem(位置);
TextView t=(TextView)v.findViewById(R.id.miwok_text_view);
t、 setText(p.getName());
ImageView i=(ImageView)v.findViewById(R.id.image);
i、 setImageResource(p.getImage());
返回v;
}
}
从activity\u main.xml获取列表视图。并为该列表设置适配器。有关更多详细信息:您将收到错误,因为您没有从类中获取值。
这是我使用的代码
@NonNull
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view =convertView;
LayoutInflater layoutInflater = LayoutInflater.from(getContext());
if (convertView==null){
view=layoutInflater.inflate(R.layout.customplaylist,parent,false);
}
Playlistfileinfo playlistfileinfo =(Playlistfileinfo)getItem(position);
TextView textView =(TextView)view.findViewById(R.id.textView7);
textView.setTypeface(typeface);
textView.setText(playlistfileinfo.getName());
return view;
}
您可以看到
playlifileinfo playlifileinfo=(playlifileinfo)getItem(position)代码>希望这对您有所帮助。我已经在主活动的ArrayList末尾解决了它
初始化。在OnCreate方法中创建Listview,并将数组适配器设置为Listview
CustomAdapter=新的CustomAdapter(这个,单词)
您没有在OnCreate中初始化Listview,也没有将adapter设置为itOlena Y感谢您的回复,但我如何才能做到这一点CustomAdapter CustomAdapter=new CustomAdapter(这个,words);ListView lv=(ListView)findViewById(R.id.list);lv.setAdapter(自定义适配器)代码>谢谢大家我理解了这个问题并解决了它我忘了在onCreate方法中初始化listview,也忘了将数组适配器设置为listview