我有标签，其中有一些Views类似EditText,CheckBox等RadioButton。使用 ViewPager 我在这些标签之间滑动。
这是我的代码：
activity_main.xml
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<!--
This title strip will display the currently visible page title, as well as the page
titles for adjacent pages.
-->
<android.support.v4.view.PagerTitleStrip
android:id="@+id/pager_title_strip"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="#33b5e5"
android:paddingBottom="4dp"
android:paddingTop="4dp"
android:textColor="#fff" />
</android.support.v4.view.ViewPager>
MainActivity.java
public class MainActivity extends FragmentActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.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.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
private static DBManager dbManager;
private static SharedPreferences myPrefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbManager = new DBManager();
try {
DBManager.init(getApplicationContext());
} catch (SQLException e) {
Log.e("SQLException: ", e.toString());
}
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i2) {
}
@Override
public void onPageSelected(int i) {
Log.i("Page", "" + i);
// Fragment frag = mSectionsPagerAdapter.getPrimaryItem();
// View v = frag.getView();
// if(v != null)
// Log.i("mda", "haaa");
}
@Override
public void onPageScrollStateChanged(int i) {
Log.i("mda", "hu");
}
});
}
@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;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private Fragment currentFragment;
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
public Fragment getPrimaryItem(){
return currentFragment;
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// Show 3 total pages.
return 5;
}
@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);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
case 3:
return getString(R.string.title_section4).toUpperCase(l);
case 4:
return getString(R.string.title_section5).toUpperCase(l);
}
return null;
}
@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
super.setPrimaryItem(container, position, object);
currentFragment = (Fragment)object;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_dummy, container, false);
TextView dummyTextView = (TextView) rootView.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
}
}
fragment_main_dummy.xml 1 个选项卡 xml 的示例
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MainActivity$DummySectionFragment"
android:orientation="vertical">
<TextView
android:id="@+id/section_label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tag="Mda"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/field1"
android:tag="Muda"
android:text="lalalala"/>
<CheckBox
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="New CheckBox"
android:id="@+id/checkBox"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="76dp"
android:text="New Text"
android:id="@+id/textView"
android:layout_gravity="left|center_vertical"
android:layout_marginLeft="158dp"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New RadioButton"
android:id="@+id/radioButton"
android:layout_gravity="left|center_vertical"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New RadioButton"
android:id="@+id/radioButton2"
android:layout_gravity="left|center_vertical"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New RadioButton"
android:id="@+id/radioButton3"
android:layout_gravity="left|center_vertical"/>
</LinearLayout>
问题：
我想要做的是在更改页面后从视图中收集所有输入。当用户更改 ViewPage 并转到第二个选项卡时，我需要获取他在前一个选项卡中写入的所有信息。
我可以在设置primaryItem 的帮助下获得当前页面片段的视图，但我无法获得上一个选项卡的视图。怎么做到呢 ？
提前致谢。