SharedPreferences

[figone2000]

ciao raga. nella mia app dovrei utilizzare lo SharedPreferences per rendere delle immagini visibili/invisibili. qualcuno potrebbe aiutarmi?
questo è file xml layout con le ImageView:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"<br /> xmlns:tools="http://schemas.android.com/tools"<br /> android:layout_width="fill_parent"<br /> android:layout_height="fill_parent"<br /> android:background="#0099cc"<br /> tools:context=".Scegli_livello_mitra" ><br /> <br /> <!--<br /> The primary full-screen view. This can be replaced with whatever view<br /> is needed to present your content, e.g. VideoView, SurfaceView,<br /> TextureView, etc.<br /> --><br /> <br /> <!--<br /> This FrameLayout insets its children based on system windows using<br /> android:fitsSystemWindows.<br /> --><br /> <br /> <ImageView<br /> android:id="@+id/livello2"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:layout_gravity="center_horizontal"<br /> android:layout_marginRight="60dp"<br /> android:layout_marginTop="80dp"<br /> android:src="@drawable/livello_scegli" <br /> android:visibility="invisible" /><br /> <br /> <ImageView<br /> android:id="@+id/livello1"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:layout_gravity="center_horizontal"<br /> android:layout_marginRight="120dp"<br /> android:layout_marginTop="80dp"<br /> android:src="@drawable/livello_scegli" /><br /> <br /> <ImageView<br /> android:id="@+id/livello2no"<br /> android:layout_width="wrap_content"<br /> android:layout_height="wrap_content"<br /> android:layout_gravity="center_horizontal"<br /> android:layout_marginRight="60dp"<br /> android:layout_marginTop="80dp"<br /> android:src="@drawable/livello_scegli_no" <br /> android:visibility="visible" /><br /> <br /> </FrameLayout>

questa è l'activity dove, premendo un tasto, l'imageView qui sopra con l'id "livello2no" deve diventare invisibile e l'Imageview con l'id "livello2" deve diventare visibile:
package com.figone2000.sparo;<br /> <br /> import com.example.sparo.R;<br /> import android.app.Activity;<br /> import android.content.Intent;<br /> import android.media.MediaPlayer;<br /> import android.os.Bundle;<br /> import android.util.Log;<br /> import android.view.View;<br /> import android.view.Window;<br /> import android.view.WindowManager;<br /> import android.widget.ImageView;<br /> <br /> public class Livello1_mitra extends Activity {<br /> protected static final String TAG = "Livello1_mitra";<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> // remove title<br /> requestWindowFeature(Window.FEATURE_NO_TITLE);<br /> getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,<br /> WindowManager.LayoutParams.FLAG_FULLSCREEN);<br /> setContentView(R.layout.livello1_mitra);<br /> <br /> final MediaPlayer suono_mitra = MediaPlayer.create(this, R.raw.suono_mitra);<br /> <br /> final ImageButton spara_tasto = (ImageButton)this.findViewById(R.id.spara_tasto);<br /> <br /> final ImageView mirino = (ImageView)this.findViewById(R.id.mirino);<br /> <br /> final ImageView centro = (ImageView)this.findViewById(R.id.centro);<br /> <br /> final ImageView omino = (ImageView)this.findViewById(R.id.omino1);<br /> <br /> final ImageView hai_vinto = (ImageView)this.findViewById(R.id.hai_vinto);<br /> <br /> final ImageView esci_vinto = (ImageView)this.findViewById(R.id.esci_vinto);<br /> <br /> final ImageView riprova_vinto = (ImageView)this.findViewById(R.id.riprova_vinto);<br /> <br /> final ImageView livello_successivo = (ImageView)this.findViewById(R.id.livello_successivo);<br /> <br /> spara_tasto.setOnClickListener(new View.OnClickListener() {<br /> @Override<br /> public void onClick(View v) {<br /> int y1 = 134;<br /> int y2 = 220;<br /> int x1 = 99;<br /> int x2 = 180;<br /> Log.v(TAG, "Playing sound...");<br /> suono_mitra.start();<br /> if (mirino.getBottom() >= y1 && mirino.getTop() <= y2 &&<br /> mirino.getLeft() >=x1 && mirino.getRight() <= x2 &&<br /> centro.getVisibility() == View.VISIBLE){<br /> num_omini.setText("0");<br /> omino.setVisibility(View.INVISIBLE);<br /> centro.setVisibility(View.INVISIBLE);<br /> hai_vinto.setVisibility(View.VISIBLE);<br /> esci_vinto.setVisibility(View.VISIBLE);<br /> riprova_vinto.setVisibility(View.VISIBLE);<br /> livello_successivo.setVisibility(View.VISIBLE);<br /> timer.cancel();<br /> frecce.setEnabled(false);<br /> spara_tasto.setEnabled(false);<br /> esci_vinto.setOnClickListener(new View.OnClickListener() {<br /> @Override<br /> public void onClick(View v) {<br /> Intent i = new Intent(getApplicationContext(), Scegli_livello_mitra.class);<br /> startActivity(i);<br /> }<br /> });<br /> riprova_vinto.setOnClickListener(new View.OnClickListener() {<br /> @Override<br /> public void onClick(View v) {<br /> Intent i = new Intent(getApplicationContext(), Livello1_mitra.class);<br /> startActivity(i);<br /> }<br /> });<br /> livello_successivo.setOnClickListener(new View.OnClickListener() {<br /> @Override<br /> public void onClick(View v) {<br /> Intent i = new Intent(getApplicationContext(), Livello2_mitra.class);<br /> startActivity(i);<br /> }<br /> });<br /> <br /> }<br /> <br /> Log.v(TAG, "Sounds initialized.");}<br /> });<br /> };<br /> }

cosa devo fare? spero che qualcuno possa aiutarmi...