AdapterViewFlipper

AdapterViewFlipper è un elemento dell’interfaccia utente utilizzato per passare da una visualizzazione all’altra.
Andiamo a dichiarare un AdatperViewFlipper nel nostro file main xml:

<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout
xmlns:android=”http://schemas.android.com/apk/res/android&#8221;
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:gravity=”center”
android:orientation=”vertical”>
<AdapterViewFlipper
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:id=”@+id/adapterViewFlipper” />
</LinearLayout>

Adesso andiamo a creare il file list_item.xml:

<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android&#8221;
    android:layout_width=”fill_parent”
    android:layout_height=”fill_parent”
    android:orientation=”vertical”>

<TextView
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:id=”@+id/text”
android:textAppearance=”?android:attr/textAppearanceMedium”/>
    <ImageView
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:id=”@+id/image”/>
</LinearLayout>

Sul mainActivity.java utilizziamo BaseAdapter per inserire i dati in AdapterViewFlipper , setFlipInterval per impostare l’intervallo di tempo in millisecondi e setAutoStart che fa iniziare automaticamente l’animazione :

package com.example.adapterViewFlipper.activities;

import android.app.Activity;
import android.os.Bundle;
import com.example.adapterViewFlipper.R;
import android.widget.*;
import android.content.*;
import android.view.*;

public class MainActivity extends Activity {


AdapterViewFlipper adapterViewFlipper;

int[] Images= {
  R.mipmap.ic_dog,
  R.mipmap.ic_cat,
  R.mipmap.ic_lion

   };
  String[] Texts = {
“Dog”,
“Cat”,
“Lion”
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

adapterViewFlipper =findViewById(R.id.adapterViewFlipper);

MyAdapter myAdapter = new MyAdapter
(getApplicationContext(),Texts,Images);

adapterViewFlipper.setAdapter(myAdapter);
    adapterViewFlipper.setFlipInterval(3000);
adapterViewFlipper.setAutoStart(true);
}
}

class MyAdapter extends BaseAdapter {

int[] images;
String[] texts;
LayoutInflater inflater;

   public MyAdapter(Context context, String[] texts, int[] images) {
   this.images= images;
   this.texts= texts;

    this.inflater = LayoutInflater.from(context);

}

   @Override
   public int getCount() {
return texts.length;
}

  @Override
public Object getItem(int position) {
return null;
}

  @Override
public long getItemId(int position) {
return 0;
}

  @Override
public View getView(int position, View view, ViewGroup parent) {
  view = inflater.inflate(R.layout.list_item, null);
TextView name = view.findViewById(R.id.text);
ImageView image = view.findViewById(R.id.image);
  name.setText(texts[position]);
  image.setImageResource(images[position]);
return view;
}

}