title: .setImageResource() is not working
body: <p>I want to change the <code>drawable</code> of <code>ImageView</code> dynamically after clicking it. So I wrote the below code. All other functions are working including <code>setImageResource</code> without having any error, but not showing any changes in the UI. I have also tried to call <code>setImageDrawable</code>, but it is also not working... Please, help me</p>
  
  <pre><code>package com.example.runwaylabz.canvi;
  
  
  import android.content.Intent;
  import android.os.Bundle;
  import android.support.annotation.Nullable;
  import android.support.v4.app.Fragment;
  import android.view.LayoutInflater;
  import android.view.View;
  import android.view.ViewGroup;
  import android.widget.ImageView;
  
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.Socket;
  
  public class BlankFragment extends Fragment implements View.OnClickListener {
  private String title;
  private int page;
  private static ImageView icon1, icon2, icon3, icon4, icon5, icon6, icon7, icon8;
  boolean icon1boolean, icon2boolean, icon3boolean, icon4boolean, icon5boolean, icon6boolean, icon7boolean, icon8boolean;
  private static String ip = "192.168.4.1";
  private static int port = 23;
  private static SocketConnection socketConnection;
  
  
  public static BlankFragment newInstance(int page, String title) {
      BlankFragment blankFragment = new BlankFragment();
      Bundle args = new Bundle();
      args.putInt("ind", page);
      args.putString("tit", title);
      blankFragment.setArguments(args);
      socketConnection = SocketConnection.getInstance(ip, port);
      return blankFragment;
  }
  
  
  @Override
  public void onCreate(@Nullable Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
      page = getArguments().getInt("ind", 0);
      title = getArguments().getString("tit", "Add");
  
  
  }
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
                           Bundle savedInstanceState) {
  
      getActivity().startService(new Intent(getActivity(), socketConnection.getClass()));
  
      View v = inflater.inflate(R.layout.fragment_blank, container, false);
  
      set_icon(v);
  
      return v;
  }
  
  @Override
  public void onDestroyView() {
  
      getActivity().stopService(new Intent(getActivity(), socketConnection.getClass()));
  
      super.onDestroyView();
  }
  
  
  @Override
  public void onClick(View view) {
      if (view.getTag().equals("icon")) {
          icon_click_switch(view);
      }
  
  }
  
  
  private void set_icon(View v) {
  
      icon1 = (ImageView) v.findViewById(R.id.icon1);
      icon2 = (ImageView) v.findViewById(R.id.icon2);
      icon3 = (ImageView) v.findViewById(R.id.icon3);
      icon4 = (ImageView) v.findViewById(R.id.icon4);
      icon5 = (ImageView) v.findViewById(R.id.icon5);
      icon6 = (ImageView) v.findViewById(R.id.icon6);
      icon7 = (ImageView) v.findViewById(R.id.icon7);
      icon8 = (ImageView) v.findViewById(R.id.icon8);
      icon1.setOnClickListener(this);
      icon2.setOnClickListener(this);
      icon3.setOnClickListener(this);
      icon4.setOnClickListener(this);
      icon5.setOnClickListener(this);
      icon6.setOnClickListener(this);
      icon7.setOnClickListener(this);
      icon8.setOnClickListener(this);
      icon1.setTag("icon");
      icon2.setTag("icon");
      icon3.setTag("icon");
      icon4.setTag("icon");
      icon5.setTag("icon");
      icon6.setTag("icon");
      icon7.setTag("icon");
      icon8.setTag("icon");
  
  }
  
  private void icon_click_switch(View view) {
  
      switch (view.getId()) {
  
          case R.id.icon1:
              if (!icon1boolean) {
                  icon1.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon1on));
                  icon1boolean = true;
              } else {
                  icon1.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon1off));
                  icon1boolean = false;
              }
              break;
          case R.id.icon2:
              if (!icon2boolean) {
                  icon2.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon2on));
                  icon2boolean = true;
              } else {
                  icon2.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon2off));
                  icon2boolean = false;
              }
              break;
          case R.id.icon3:
              if (!icon3boolean) {
                  icon3.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon3on));
                  icon3boolean = true;
              } else {
                  icon3.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon3off));
                  icon3boolean = false;
              }
              break;
          case R.id.icon4:
              if (!icon4boolean) {
                  icon4.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon4on));
                  icon4boolean = true;
              } else {
                  icon4.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon4off));
                  icon4boolean = false;
              }
              break;
          case R.id.icon5:
              if (!icon5boolean) {
                  icon5.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon5on));
                  icon5boolean = true;
              } else {
                  icon5.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon5off));
                  icon5boolean = false;
              }
              break;
          case R.id.icon6:
              if (!icon6boolean) {
                  icon6.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon6on));
                  icon6boolean = true;
              } else {
                  icon6.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon6off));
                  icon6boolean = false;
              }
              break;
          case R.id.icon7:
              if (!icon7boolean) {
                  icon7.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon7on));
                  icon7boolean = true;
              } else {
                  icon7.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon7off));
                  icon7boolean = false;
              }
              break;
          case R.id.icon8:
              if (!icon8boolean) {
                  icon8.setImageResource(R.drawable.poweron);
                  socketConnection.writeouputstream(getString(R.string.icon8on));
                  icon8boolean = true;
              } else {
                  icon8.setImageResource(R.drawable.power);
                  socketConnection.writeouputstream(getString(R.string.icon8off));
                  icon8boolean = false;
              }
              break;
      }
    }
  } 
  </code></pre>