为什么关闭wifi时图片还在？怎么修改？

public class MainActivity extends AppCompatActivity {
private ToggleButton TB;
private RadioButton RB1,RB2,RB3;
private RadioGroup RG;
private ImageView imageView1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.work);
        initView();
        setListener();
        }
        public void setListener(){
        RG.setOnCheckedChangeListener(new one());
        TB.setOnClickListener(new two());
        }
class one implements RadioGroup.OnCheckedChangeListener {

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId){
            case R.id.RB1:
                imageView1.setImageResource(R.drawable.office);
                break;
            case R.id.RB2:
                imageView1.setImageResource(R.drawable.meeting);
                break;
            case R.id.RB3:
                imageView1.setImageResource(R.drawable.visitor);
                break;
        }
        imageView1.setVisibility(View.VISIBLE);
    }
}
class two implements View.OnClickListener{

    @Override
    public void onClick(View v) {
        if(TB.isChecked()){
            RG.setVisibility(View.VISIBLE);
        }else {
            RG.setVisibility(View.GONE);
            imageView1.setVisibility(View.GONE);
            RB1.setChecked(false);
            RB2.setChecked(false);
            RB3.setChecked(false);
        }
    }
}
    private void initView() {
        TB=(ToggleButton)findViewById(R.id.TB);
        RB1=(RadioButton)findViewById(R.id.RB1);
        RB2=(RadioButton)findViewById(R.id.RB2);
        RB3=(RadioButton)findViewById(R.id.RB3);
        RG=(RadioGroup)findViewById(R.id.RG);
        imageView1=(ImageView)findViewById(R.id.IV1);

    }

}