点击后，Android返回到相同的片段上转到第一个片段鉴于寻呼机 [英] Android Return back to same fragment after click on goto first fragment in view pager
问题描述
我使用fragment.In，我移动到一个网页到另一个使用片段class.in第二个片段类我有一个按钮，回到我写编码直接到第一个片段移动开发了一个我用寻呼机查看应用程序1通过fragment.replace但是用第一个片段，我不滚动页面传呼机一到另一种手段后，当我点击后退按钮我移动到第一个片段，但我没能回到那个类againg。所以我不能有想法再绳拉动/滚动页面首先要到第二个片段。请帮我快，先谢谢了。
I developed one apps in that one i used view pager using fragment.In that i move to one page to another using fragment class.in second fragment class i have one button back on that i write coding to move direct to first fragment through fragment.replace but after replacing first fragment i don't scroll pager page to one to another means when i click on back button i move to first fragment but i not able to go back to that class againg. So i can not have idea to hove move/scroll page again to go first to second fragment. please help me quickly,thanks in advance.
我的第一类follewing：
My First class follewing :
enter code here
public class ViewPagerMainActivity extends FragmentActivity implements
OnClickListener, OnPageChangeListener {
// all variable declare here
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN
| WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD,
WindowManager.LayoutParams.FLAG_FULLSCREEN
| WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
);
setTheme(android.R.style.Theme_Light_NoTitleBar);
setContentView(R.layout.view_pager_main);
// other code here
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(
android.support.v4.app.FragmentManager fragmentManager) {
super(fragmentManager);
}
@Override
public Fragment getItem(int pos) {
switch (pos) {
case 0:
return FirstFragment.newInstance("");
case 1:
return SecondFragment.newInstance("");
default:
return SecondFragment.newInstance("Default");
}
}
@Override
public int getCount() {
return 2; // return no of fragment created by us
}
}
@Override
public void onClick(View v) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
}
}
enter code here SECOND FILE
public class FirstFragment extends Fragment implements OnTouchListener {
// all variable decalre here
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().setTheme(android.R.style.Theme_Light_NoTitleBar);
v = inflater.inflate(R.layout.sliding_lock_pager, container, false);
// other code here
return v;
}
public static FirstFragment newInstance(String text) {
FirstFragment f = new FirstFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return false;
}
}
第三档
在此输入code
公共类SecondFragment扩展片段实现OnClickListener {
} third file enter code here public class SecondFragment extends Fragment implements OnClickListener {
// all varible decalare here
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().setTheme(android.R.style.Theme_Light_NoTitleBar);
View v = inflater.inflate(R.layout.password, container, false);
// other code here
// this method move to main pager
txtBack.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final android.support.v4.app.FragmentTransaction ft = getFragmentManager()
.beginTransaction();
ft.replace(R.id.layputMainPager, new FirstFragment(),
"NewFragmentTag");
ft.addToBackStack(null);
ft.commit();
}
});
return v;
}
public static SecondFragment newInstance(String text) {
SecondFragment f = new SecondFragment();
Bundle b = new Bundle();
b.putString("msg", text);
f.setArguments(b);
return f;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
See in secondFragment class when i back through back button then i want to scroll again to that page i not do that. i move again to that page though page scroll. and in ft.replace(R.id.layputMainPager, new FirstFragment()) R.id.layputMainPager is `class ViewPagerMainActivity` class xml files a
主要布局ID。
main layout id.
推荐答案
我已经经历了同样的问题，几天不见回来，我想你是混合2个不同的实现方式：
I have gone through same problem few days back, I think you are mixing 2 different implementations:
-
如果您使用的是碎片与ViewPager。您可以使用ViewPager的setCurrentItem（）方法来移动到下一个或$ P $光伏片段。
If you are using fragments with ViewPager. You can use ViewPager's setCurrentItem() method to move to next or prev fragment.
如果您使用的碎片然后片段之间移动，你可以使用FragmentTransaction类的方法，如替换（），加（）等。
If you use only fragments then to move between fragments you can to use FragmentTransaction class methods like replace(), add() etc.
希望这将清除的东西。请分享code，如果事情还不清楚。
Hope this will clear things. Please share code if something is still unclear.
修改
您可以重载onBack pressed（）方法是这样的：
You can overload onBackPressed() method something like :
@Override
public void onBackPressed() {
// you can also check for current viewpager item by
// mViewpager.getCurrentItem()
mViewPager.setCurrentItem(precFragment, true);
}
如果你在你的片段添加的按钮，你可以这样做：
If you are added Button in your fragment you can do something like :
Button back = (Button) rootView.findViewById(R.id.back_button);
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((YourActivity)getActivity()).mViewPager.setCurrentItem(prevFragment);
}
});
修改：增加了code
public class MainActivity extends Activity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a {@link FragmentPagerAdapter}
* derivative, which will keep every loaded fragment in memory. If this
* becomes too memory intensive, it may be best to switch to a
* {@link android.support.v13.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onBackPressed() {
mViewPager.setCurrentItem(0, true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
default:
break;
}
return null;
}
@Override
public int getCount() {
return 2;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
}
return null;
}
}
}
FirstFragment文件
FirstFragment File
public class FirstFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section number.
*/
public static FirstFragment newInstance(int sectionNumber) {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public FirstFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_first, container,
false);
Button next = (Button) rootView.findViewById(R.id.button1);
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity)getActivity()).mViewPager.setCurrentItem(1);
}
});
return rootView;
}
}
SecondFragment文件
SecondFragment File
public class SecondFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section number.
*/
public static SecondFragment newInstance(int sectionNumber) {
SecondFragment fragment = new SecondFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public SecondFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.second_fragment, container,
false);
Button back = (Button) rootView.findViewById(R.id.button1);
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity)getActivity()).mViewPager.setCurrentItem(0);
}
});
return rootView;
}
}
请参阅SecondFragment文件onBack pressed（）方法和back.setOnClickListener（）。
希望这将有助于
Please see the onBackPressed() Method and back.setOnClickListener() in SecondFragment file. Hope this will help
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