hide and show icon

public void hide(View view){//this is button onClick
    boolean bool;
    try{
        PackageManager p = getPackageManager();
        p.setComponentEnabledSetting(getComponentName(), PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
        bool=true;
    }catch (Exception e) {
        e.printStackTrace();
        bool=false;
    }
    if (bool){
        Toast.makeText(getApplicationContext(),"hide",Toast.LENGTH_LONG).show();
    }else {
        Toast.makeText(getApplicationContext(),"Error!",Toast.LENGTH_LONG).show();
    }
}
public void showw (View view){//this is button onClick

    boolean bool;
    try{
        PackageManager p = getPackageManager();
        p.setComponentEnabledSetting(getComponentName(), PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
        bool=true;
    }catch (Exception e) {
        e.printStackTrace();
        bool=false;
    }
    if (bool){
        Toast.makeText(getApplicationContext(),"showed!",Toast.LENGTH_LONG).show();
    }else {
        Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
    }

}
//if hide icon method embedded in onCreate method, when start app(open app) icon is hide!!!