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android fragment 跳到另一个fragment
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一共有4个fragment，分别是contact（联系人），friends（朋友），search（查找），more（更多）。使用的都是同一个布局，每个fragment中都有四个内部按钮，可以切换到其他的3个fragment中。
现在只考虑在contact中，实现点4个（其实有效的是3个），切换到其他3个fragment中。
现在的情况是，点击contactfragment中的按钮，toast会响应，但是fragment不会跳转。这是怎么回事，下面是两个类的代码。
这是contactfragment。
public class ContactFragment extends Fragment implements OnClickListener {
MainActivity activity = (MainActivity) getActivity();
View view = null;
Button btn_inner_contact;
Button btn_inner_friends;
Button btn_inner_search;
Button btn_inner_more;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.frag_content, container, false);
TextView textview_hint = (TextView) view
.findViewById(R.id.textview_hint);
textview_hint.setText("Contact");
initComponent();
return view;
}
private void initComponent() {
btn_inner_contact = (Button) view
.findViewById(R.id.button_inner_contact);
btn_inner_friends = (Button) view
.findViewById(R.id.button_inner_friends);
btn_inner_search = (Button) view.findViewById(R.id.button_inner_search);
btn_inner_more = (Button) view.findViewById(R.id.button_inner_more);
btn_inner_contact.setOnClickListener(this);
btn_inner_friends.setOnClickListener(this);
btn_inner_search.setOnClickListener(this);
btn_inner_more.setOnClickListener(this);
}
@Override
public void onClick(View v) {
FragmentManager fm = activity.getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
switch (v.getId()) {
case R.id.button_inner_contact:
Toast.makeText(getActivity(), "点击了内部contact按钮", Toast.LENGTH_SHORT)
.show();
if (activity.contactFragment == null) {
activity.contactFragment = new ContactFragment();
}
ft.replace(R.id.framelayout_content, activity.contactFragment);
break;
case R.id.button_inner_friends:
Toast.makeText(getActivity(), "点击了内部friends按钮", Toast.LENGTH_SHORT)
if (activity.friendsFragment == null) {
activity.friendsFragment = new FriendsFragment();
}
ft.replace(R.id.framelayout_content, activity.friendsFragment);
break;
case R.id.button_inner_more:
if (activity.moreFragment == null) {
activity.moreFragment = new MoreFragment();
}
ft.replace(R.id.framelayout_content, activity.moreFragment);
break;
case R.id.button_inner_search:
if (activity.searchFragment == null) {
activity.searchFragment = new SearchFragment();
}
ft.replace(R.id.framelayout_content, activity.searchFragment);
break;
default:
break;
}
ft.commit();
}
}
这是mainactivity类，mainactivity中的那四个按钮及其响应时间是fragment外部的四个按钮，与内部的inner按钮没关系
public class MainActivity extends Activity implements OnClickListener {
public ContactFragment contactFragment;
public FriendsFragment friendsFragment;
public MoreFragment moreFragment;
public SearchFragment searchFragment;
private Button btn_contact;
private Button btn_friends;
private Button btn_search;
private Button btn_more;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initcomponet();
initview();
}
private void initview() {
contactFragment = new ContactFragment();
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.framelayout_content, contactFragment);
ft.commit();
}
private void initcomponet() {
btn_contact = (Button) findViewById(R.id.button_contact);
btn_friends = (Button) findViewById(R.id.button_friends);
btn_more = (Button) findViewById(R.id.button_more);
btn_search = (Button) findViewById(R.id.button_search);
btn_contact.setOnClickListener(this);
btn_friends.setOnClickListener(this);
btn_more.setOnClickListener(this);
btn_search.setOnClickListener(this);
}
@Override
public void onClick(View v) {
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
switch (v.getId()) {
case R.id.button_contact:
if (contactFragment == null) {
contactFragment = new ContactFragment();
}
ft.replace(R.id.framelayout_content, contactFragment);
break;
case R.id.button_friends:
if (friendsFragment == null) {
friendsFragment = new FriendsFragment();
}
ft.replace(R.id.framelayout_content, friendsFragment);
break;
case R.id.button_more:
if (moreFragment == null) {
moreFragment = new MoreFragment();
}
ft.replace(R.id.framelayout_content, moreFragment);
break;
case R.id.button_search:
if (searchFragment == null) {
searchFragment = new SearchFragment();
}
ft.replace(R.id.framelayout_content, searchFragment);
break;
default:
break;
}
ft.commit();
}
}
我试了一下，把MainActivity activity=（MainActivity）getActivity（）；这行代码放到onclick方法了，就可以了！
