java - Android Java 使用cardview来显示gridview的项目
问题描述
大家好,我想展示GridView
一些显示字符串数组内容的项目。这是CardView
我要设置为项目:
所以当我点击一个按钮时,电影类型选择的布局变得可见,我设置了一个适配器:
cTBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
postaCardVIew.setVisibility(View.GONE);
cT.setVisibility(View.VISIBLE);
GridView simpleGridView = findViewById(R.id.simpleGridView);
String genrelist[] = {"Commedia", "Animazione", "Anime", "Avventura", "Azione", "Biografico", "Documentario", "Drammatico", "Fantascienza","Fantasy",
"Guerra", "Horror", "Musical", "Storico", "Thriller", "Western", "Giallo", "Sentimentale",
};
final ArrayAdapter<String> adapter = new ArrayAdapter<String> (posta.this,android.R.layout.simple_list_item_1, genrelist);
simpleGridView.setAdapter(adapter);
}
但这就是我得到的:
我想放大这个布局:
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="150dp"
android:layout_height="150dp"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardCornerRadius="30dp"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Type"
android:layout_centerInParent="true"
android:textSize="20dp"
android:textStyle="bold"
/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
要得到这样的东西:
谁能帮我弄清楚如何膨胀所需的布局?
解决方案
为了使用自定义项布局,您需要创建一个自定义适配器,该适配器从BaseAdapter
orArrayAdapter
然后在方法中膨胀并构建您的项目布局getView()
:
public class CustomAdapter extends BaseAdapter {
String genrelist[] = {"Commedia", "Animazione", "Anime", "Avventura", "Azione", "Biografico", "Documentario", "Drammatico", "Fantascienza", "Fantasy",
"Guerra", "Horror", "Musical", "Storico", "Thriller", "Western", "Giallo", "Sentimentale",
};
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
holder = new ViewHolder();
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.title = convertView.findViewById(R.id.type);
holder.title.setText(genrelist[position]);
return convertView;
}
static class ViewHolder {
TextView title;
}
public int getCount() {
return genrelist.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
}
并将其用作GridView
适配器:
cTBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
postaCardVIew.setVisibility(View.GONE);
cT.setVisibility(View.VISIBLE);
GridView simpleGridView = findViewById(R.id.simpleGridView);
simpleGridView.setAdapter(new CustomAdapter());
}
});
我不得不操纵边距和关心的宽度并CardView
用 a包裹FrameLayout
以强制卡片之间的边距:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginHorizontal="4dp"
android:layout_marginVertical="4dp">
<androidx.cardview.widget.CardView xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="120dp"
android:layout_height="120dp"
app:cardCornerRadius="30dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Type: 1"
android:textSize="18sp"
android:textStyle="bold" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
</FrameLayout>
结果:
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