我正在通过android中的回收站视图实现卡片视图,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片视图。我已经尝试了所有的东西,但卡片视图没有显示出来。
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中:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/recycler"
android:scrollbars="vertical"
tools:context=".MainActivity">
&#39;
grid_item.xml:
&#39;
<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>
&#39;
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;
}
}
答案 0 :(得分:5)
将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,因此它没有绘制任何东西。