StackView è utilizzato per organizzare gli oggetti come carte impilate dove l’elemento in primo piano viene capovolto per visualizzare l’elemento posteriore.
Ecco un esempio:
<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout
xmlns:android=”http://schemas.android.com/apk/res/android“
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:gravity=”center”
android:orientation=”vertical”>
<StackView
android:id=”@+id/stackView”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”/>
</LinearLayout>
Andiamo a creare il file item.xml
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android“
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:orientation=”vertical”>
<ImageView
android:id=”@+id/image”
android:layout_width=”200dp”
android:layout_height=”100dp”
android:src=”@mipmap/ic_launcher”/>
<TextView
android:id=”@+id/text”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_margin=”10dp”
android:textSize=”30sp” />
</LinearLayout>
package com.example.stackView.activities;
import android.app.Activity;
import android.os.Bundle;
import com.example.stackView.R;
import android.widget.*;
import java.util.*;
import android.content.*;
import android.graphics.drawable.*;
public class MainActivity extends Activity {
StackView stackView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
stackView =findViewById(R.id.stackView);
StackViewAdapter stackViewAdapter =
new StackViewAdapter(getView(),R.layout.item,
MainActivity.this);
stackView.setAdapter(stackViewAdapter);
}
private List<String> getView(){
List<String> colors= new ArrayList<>();
colors.add(“Red”);
colors.add(“Yellow”);
colors.add(“Green”);
colors.add(“Pink”);
colors.add(“Black”);
colors.add(“White”);
return colors;
}
}
Adesso andiamo a creare l’adattatore per StackView
package com.example.stackView.activities;
import java.util.*;
import android.content.*;
import android.view.*;
import android.widget.*;
import com.example.stackView.*;
public class StackViewAdapter extends ArrayAdapter
{
TextView textView;
String colors;
private List<String> colorList;
private int item;
public StackViewAdapter(List<String> color, int resource, Context context) {
super(context,resource);
colorList = color;
item = resource;
}
@Override
public int getCount() {
return colorList.size();
}
@Override
public View getView(int position, View view, ViewGroup parent) {
if (view == null) {
view = LayoutInflater.from(parent.getContext())
.inflate(item, parent, false);
}
colors = colorList.get(position);
textView = view.findViewById(R.id.text);
textView.setText(colors);
return view;
}
}
App Tutorial 