activity->fragment

在onCreate(){

select(0);

}

public void select(int i) {

FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
hideFragment(ft);
switch(i){
case 0:
if(gzFragment==null){
gzFragment = new GongZuoWangFragment();
ft.add(R.id.fl_main,gzFragment);
}else{
ft.show(gzFragment);
}
break;

case 1:
if(fwFragment==null){
fwFragment = new FuWuWangFragment();
ft.add(R.id.fl_main,fwFragment);
}else{
ft.show(fwFragment);
}
break;

case 2:
if(lxFragment==null){
lxFragment = new LianXiWangFragment();
ft.add(R.id.fl_main,lxFragment);
}else{
ft.show(lxFragment);
}
break;

case 3:
if(zyFragment==null){
zyFragment = new ZhiYuanZheFragment();
ft.add(R.id.fl_main,zyFragment);
}else{
ft.show(zyFragment);
}
break;

case 4:
if(!spIsLogin.getBoolean("IsLogin",false)){
if(grFragment2==null){
grFragment2 = new GeRenFragment2();
ft.add(R.id.fl_main,grFragment2);
}else{
ft.show(grFragment2);
}
}else{
if(grFragment==null){
grFragment = new GeRenFragment();
ft.add(R.id.fl_main,grFragment);
}else{
ft.show(grFragment);
}
}
break;

}
ft.commit();



}
private void hideFragment(FragmentTransaction ft) {
if(gzFragment!=null){
ft.hide(gzFragment);
}
if(fwFragment!=null){
ft.hide(fwFragment);
}
if(lxFragment!=null){
ft.hide(lxFragment);
}
if(zyFragment!=null){
ft.hide(zyFragment);
}
if(grFragment!=null){
ft.hide(grFragment);
}
if(grFragment2!=null){
ft.hide(grFragment2);
}

}