Android 卡片视图未显示
我正在安卓系统中通过回收器视图实现卡片视图,但我的卡片视图没有显示出来。我使用自定义适配器将数据填充到卡视图。我已经尝试了所有的方法,但是卡片视图没有出现Android 卡片视图未显示,android,material-design,Android,Material Design,我正在安卓系统中通过回收器视图实现卡片视图,但我的卡片视图没有显示出来。我使用自定义适配器将数据填充到卡视图。我已经尝试了所有的方法,但是卡片视图没有出现 MainActivity.java: public class MainActivity extends Activity { private String[] mImage = {"sahil", "kunal", "somy", "manav"}; @Override protected void onCreate(Bundle sav
MainActivity.java:
public class MainActivity extends Activity {
private String[] mImage = {"sahil", "kunal", "somy", "manav"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//setting adapter
RecyclerView recyclerView = (RecyclerView)findViewById(R.id.recycler);
GridLayoutManager manager = new GridLayoutManager(this, 2);
recyclerView.setAdapter(new Adapter(mImage));
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(manager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml:
"
"
"
Adapter.java:
公共类适配器扩展了RecyclerView.Adapter{
私有字符串[]镜像;
公共适配器(字符串[]mImage){
this.mImage=mImage;
}
公共静态类持有者扩展了RecyclerView.ViewHolder{
公共卡视图卡视图;
公共文本视图文本视图;
公共持有人(查看项目视图){
超级(项目视图);
cardView=(cardView)itemView.findViewById(R.id.card);
textView=(textView)itemView.findViewById(R.id.text);
}
}
@凌驾
public Holder onCreateViewHolder(视图组父级,int-viewType){
View=LayoutFlater.from(parent.getContext()).flate(R.layout.grid_项,parent,false);
支架=新支架(视图);
报税表持有人;
}
@凌驾
公共无效onBindViewHolder(Holder Holder,内部位置){
holder.textView.setText(mImage[position]);
}
@凌驾
附加ToRecyclerView(RecyclerView RecyclerView)上的公共无效{
super.onAttachedToRecyclerView(recyclerView);
}
@凌驾
public int getItemCount(){
返回0;
}
}将您的
getItemCount()
方法更改为:
@Override
public int getItemCount() {
return mImage.length;
}
现在你说你的适配器有0个项目,所以它没有画任何东西。@SahilShokeen很高兴听到这个消息!请在回答允许时接受此答案。:)我是新来的,所以我不知道;我没有15个reputations@SahilShokeen接受回答没有声誉限制。如果此答案解决了您的问题,您可以通过单击答案旁边的复选标记来接受它。这将有助于将来偶然发现您的问题的读者。:)@McAdam331你能帮我回答我的新问题吗:
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/text"/>
</LinearLayout>
Adapter.java:
public class Adapter extends RecyclerView.Adapter<Adapter.Holder> {
private String[] mImage;
public Adapter(String[] mImage) {
this.mImage = mImage;
}
public static class Holder extends RecyclerView.ViewHolder{
public CardView cardView;
public TextView textView;
public Holder(View itemView) {
super(itemView);
cardView = (CardView)itemView.findViewById(R.id.card);
textView = (TextView)itemView.findViewById(R.id.text);
}
}
@Override
public Holder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_item, parent, false);
Holder holder = new Holder(view);
return holder;
}
@Override
public void onBindViewHolder(Holder holder, int position) {
holder.textView.setText(mImage[position]);
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
@Override
public int getItemCount() {
return 0;
}
@Override
public int getItemCount() {
return mImage.length;
}