我将网上看到的示例应用到我的代码中，以实现一个介绍页面（ViewPager有4页）。 为此，我在创建新活动时使用Android Studio提供的本机代码。
我根据我们所依赖的片段改编了以下编写texte的代码：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView textView = (TextView) rootView.findViewById(R.id.section_label);
textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
return rootView;
}
以下代码，使用开关，根据我们所依赖的片段显示不同的内容（按钮颜色，文本，图标）：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Context context = getContext();
View rootView = inflater.inflate(R.layout.fragment_welcome, container, false);
TextView textViewTitle = (TextView) rootView.findViewById(R.id.txtViewWelcomeTitle);
TextView textViewDesc = (TextView) rootView.findViewById(R.id.txtViewWelcomeDesc);
ImageView imageView = (ImageView) rootView.findViewById(R.id.imageViewWelcome);
switch (getArguments().getInt(ARG_SECTION_NUMBER))
{
case 1:
imageView.setImageResource(R.drawable.ic_menu_camera);
textViewTitle.setText(R.string.fragment_1_title);
textViewDesc.setText(R.string.fragment_1_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen1));
btnNext.setText(R.string.next);
btnSkip.setVisibility(View.VISIBLE);
/*btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// launch next page of the fragment.
}
});*/
break;
case 2:
imageView.setImageResource(R.drawable.ic_menu_gallery);
textViewTitle.setText(R.string.fragment_2_title);
textViewDesc.setText(R.string.fragment_2_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen2));
btnNext.setText(R.string.next);
btnSkip.setVisibility(View.VISIBLE);
break;
case 3:
imageView.setImageResource(R.drawable.ic_menu_manage);
textViewTitle.setText(R.string.fragment_3_title);
textViewDesc.setText(R.string.fragment_3_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen3));
btnNext.setText(R.string.next);
btnSkip.setVisibility(View.VISIBLE);
break;
case 4:
imageView.setImageResource(R.drawable.ic_menu_send);
textViewTitle.setText(R.string.fragment_4_title);
textViewDesc.setText(R.string.fragment_4_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen4));
btnNext.setText(R.string.start);
btnSkip.setVisibility(View.INVISIBLE);
break;
}
return rootView;
}
我要看的是4页，其中3页有两个按钮（跳过和下一个），第4页有“开始”按钮。
我看到的内容：2个首页仅显示2个按钮，＆＃34;开始＆＃34;第3页和第4页上的按钮。
当我调试我的应用程序时，似乎我的代码通过案例1，然后通过案例2，然后我的应用程序显示案例1页面。 这意味着，当我切换时，我的页面似乎是他们应该位置的+1（我的页面1最终是2，2是3，......）。 奇怪的是，我显示的texte和图标是正确的。
以下是完整的WelcomActivity：
public class WelcomeActivity extends AppCompatActivity {
/**
* 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.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
public static final String PREFS_NAME = "StartPref";
private PrefManager prefManager;
private static LinearLayout dotsLayout;
private static TextView[] dots;
private static Button btnSkip, btnNext;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Checking for first time launch - before calling setContentView()
/* prefManager = new PrefManager(this);
if (!prefManager.isFirstTimeLaunch()) {
goToHomePage();
finish();
}
*/
if (Build.VERSION.SDK_INT >= 21) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
setContentView(R.layout.activity_welcome);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
btnSkip = (Button) findViewById(R.id.btn_skip);
btnNext = (Button) findViewById(R.id.btn_next);
// making notification bar transparent
changeStatusBarColor();
btnSkip.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
goToHomePage(v);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_welcome, menu);
return 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
public PlaceholderFragment() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Context context = getContext();
View rootView = inflater.inflate(R.layout.fragment_welcome, container, false);
TextView textViewTitle = (TextView) rootView.findViewById(R.id.txtViewWelcomeTitle);
TextView textViewDesc = (TextView) rootView.findViewById(R.id.txtViewWelcomeDesc);
ImageView imageView = (ImageView) rootView.findViewById(R.id.imageViewWelcome);
switch (getArguments().getInt(ARG_SECTION_NUMBER))
{
case 1:
imageView.setImageResource(R.drawable.ic_menu_camera);
textViewTitle.setText(R.string.fragment_1_title);
textViewDesc.setText(R.string.fragment_1_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen1));
btnNext.setText(R.string.next);
btnSkip.setVisibility(View.VISIBLE);
/*btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// launch next page of the fragment.
}
});*/
break;
case 2:
imageView.setImageResource(R.drawable.ic_menu_gallery);
textViewTitle.setText(R.string.fragment_2_title);
textViewDesc.setText(R.string.fragment_2_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen2));
btnNext.setText(R.string.next);
btnSkip.setVisibility(View.VISIBLE);
break;
case 3:
imageView.setImageResource(R.drawable.ic_menu_manage);
textViewTitle.setText(R.string.fragment_3_title);
textViewDesc.setText(R.string.fragment_3_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen3));
btnNext.setText(R.string.next);
btnSkip.setVisibility(View.VISIBLE);
break;
case 4:
imageView.setImageResource(R.drawable.ic_menu_send);
textViewTitle.setText(R.string.fragment_4_title);
textViewDesc.setText(R.string.fragment_4_desc);
rootView.setBackgroundColor(ContextCompat.getColor(context, R.color.bg_screen4));
btnNext.setText(R.string.start);
btnSkip.setVisibility(View.INVISIBLE);
break;
}
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
return PlaceholderFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 4 total pages.
return 4;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "SECTION 1";
case 1:
return "SECTION 2";
case 2:
return "SECTION 3";
case 3:
return "SECTION 4";
}
return null;
}
}
public void goToHomePage(View view) {
prefManager.setFirstTimeLaunch(false);
Intent intent = new Intent(this, HomePageActivity.class);
startActivity(intent);
}
/**
* Making notification bar transparent
*/
private void changeStatusBarColor() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
private void addBottomDots(int currentPage) {
dots = new TextView[mSectionsPagerAdapter.getCount()];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
dotsLayout.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
}
这里是fragment_welcome.xml，然后是activity_welcome.xml
<RelativeLayout 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:background="@color/bg_screen1"
tools:context="com.example.avescera.remindme.WelcomeActivity$PlaceholderFragment" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:orientation="vertical">
<ImageView
android:layout_width="@dimen/img_width_height"
android:layout_height="@dimen/img_width_height"
android:src="@drawable/ic_menu_manage"
android:id="@+id/imageViewWelcome" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/white"
android:textSize="@dimen/slide_title"
android:textStyle="bold"
android:id="@+id/txtViewWelcomeTitle" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:paddingLeft="@dimen/desc_padding"
android:paddingRight="@dimen/desc_padding"
android:textAlignment="center"
android:textColor="@android:color/white"
android:textSize="@dimen/slide_desc"
android:id="@+id/txtViewWelcomeDesc" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.avescera.remindme.WelcomeActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/appbar_padding_top"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<LinearLayout
android:id="@+id/layoutDots"
android:layout_width="match_parent"
android:layout_height="@dimen/dots_height"
android:layout_marginBottom="@dimen/dots_margin_bottom"
android:gravity="center"
android:orientation="horizontal"
android:layout_alignParentBottom="false"
android:layout_below="@+id/viewDots"
android:layout_gravity="bottom|center_horizontal"></LinearLayout>
<View
android:id="@+id/viewDots"
android:layout_width="match_parent"
android:layout_height="1dp"
android:alpha=".5"
android:background="@android:color/white"
android:layout_gravity="bottom|center" />
<Button
android:id="@+id/btn_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="@null"
android:text="@string/next"
android:textColor="@android:color/white"
android:layout_gravity="bottom|left" />
<Button
android:id="@+id/btn_skip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="@null"
android:text="@string/skip"
android:textColor="@android:color/white"
android:layout_gravity="bottom|right" />
</android.support.design.widget.CoordinatorLayout>
如果您需要任何信息，请不要犹豫。
亚历
答案 0 :(得分：1)
最后我找到了如何回答我的问题（对那些有兴趣解决这个问题的人）。
首先，更多细节。我使用了android studio（2.2）提供的内置活动tabbed-activity。这个允许使用片段寻呼机，并且似乎行为（例如显示第一个片段，但在你的代码中，你已经在第二个片段中，没有正确理解它是如何工作的。）
对我来说，我想要4页（我的片段寻呼机有4个部分）和2个按钮在底部（附加到活动xml而不是片段xml）。
解决方案是simlpe：在onCreateView（）部分添加片段文本更新，在OnCreate（）部分添加按钮文本更新（和onClickListener）。
在OnCreate（）部分，要知道使用了哪个页面片段，您必须使用ViewPager，并在其上添加addOnPageChangeListener。然后没关系，你可以在其中添加一个开关来知道哪个页面，检查位置的值（从0到你有的页数-1）。
希望这有帮助。