title: Random image, array and probability android studio
body: <p>I have several questions with random topic . First, I 'm trying to make an app that take a random picture of an array and show it on a image view . What I want to do next, and i cant, is that  set visible a button according to the displayed image appears. How can i do?</p>
  
  <p>My code:</p>
  
  <pre><code>public class MainActivity extends Activity {
  
  Button b1, b2,b3,b4,b5;
  ImageView iv1,iv2;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      iv1=(ImageView)findViewById(R.id.iv1);
      iv2=(ImageView)findViewById(R.id.iv2);
      b1=(Button)findViewById(R.id.b1);
      b2=(Button)findViewById(R.id.b2);
      b3=(Button)findViewById(R.id.b3);
      b4=(Button)findViewById(R.id.b4);
      b5=(Button)findViewById(R.id.b5);
  }
  
  @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);
  }
  
  public void Accion1 (View view){
  
      final TypedArray imgs = getResources().obtainTypedArray(R.array.RandomImages);
      final Random rand = new Random();
      final int rndInt = rand.nextInt(imgs.length());
      final int rID = imgs.getResourceId(rndInt, 0);
      iv2.setImageResource(rID);
  
      b1.setVisibility(View.INVISIBLE);
      b2.setVisibility(View.VISIBLE);
  }
  
  public void Accion2(View view){
      b2.setVisibility(View.INVISIBLE);
      switch (iv2.getId()){
          case 1:
              iv2.setImageResource(R.drawable.imagen1);
              b3.setVisibility(View.VISIBLE);
              break;
          case 2:
              iv2.setImageResource(R.drawable.imagen2);
              b4.setVisibility(View.VISIBLE);
              break;
          case 3:
              iv2.setImageResource(R.drawable.imagen3);
              b5.setVisibility(View.VISIBLE);
              break;
      }
  }
  </code></pre>
  
  <p>}</p>
  
  <p>My other two questions are, it is possible to have 3 array , each with pictures, and do a random? first make a random array with those 3 and then another to take a picture of that array.
  The other question is, it is possible to make an image has more or less probabilities to appear in a random?</p>