我在ViewPager和Fragment实现方面遇到了一些问题。
我在ViewPager中有4个片段{A; B; C：D}，其中一个是配置文件视图（D片段）。当用户登录时，我有一个FragmentTransaction用一个详细的配置文件视图{D --- D1}替换该配置文件视图。在那个详细的配置文件视图视图中，我实现了一个自定义的onBackPressed行为，仅针对像这样的片段
this.rootView.setFocusableInTouchMode(true);
this.rootView.requestFocus();
this.rootView.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() != KeyEvent.ACTION_DOWN) {
final MaterialDialog mMaterialDialog = new
MaterialDialog(getActivity());
mMaterialDialog.setTitle("LOG OUT")
.setMessage("If you log out right now, you will not be able to make a booking")
.setPositiveButton("OK", new View.OnClickListener() {
@Override
public void onClick(View v) {
ParseUser user = ParseUser.getCurrentUser();
user.logOut();
mMaterialDialog.dismiss();
FragmentTransaction trans = getFragmentManager()
.beginTransaction();
trans.replace(R.id.profile_frame, new ProfileFragment());
trans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
trans.commit();
}
})
.setNegativeButton("CANCEL", new View.OnClickListener() {
@Override
public void onClick(View v) {
mMaterialDialog.dismiss();
}
});
mMaterialDialog.show();
return true;
}
switch (keyCode) {
case KeyEvent.KEYCODE_1:
break;
case KeyEvent.KEYCODE_2:
break;
case KeyEvent.KEYCODE_3:
break;
}
return true;
}
});
我的问题是当用户点击片段B中的后退按钮时，它会触发片段D1方法。为什么会这样？这是我的主要活动和完整片段D1代码
主要活动
public class MainActivity extends FragmentActivity {
private TabLayout tabLayout; private LinearLayout settings, booking, about;
private Button contactUs, visitOurSite;
private DrawerLayout drawer; private LinearLayout drawerContent;
private Tracker tracker;
private Fragment musicFrag, profileDetailFrag, filterFrag, mapFrag, profileFrag, favoritesFrag;
private ViewPager viewPager;
private int[] tabIconsUnselected = {
R.drawable.tab_home,
R.drawable.tab_map,
R.drawable.tab_favorites,
R.drawable.tab_profile
};
private int[] tabIconsSelected = {
R.drawable.tab_home_pressed,
R.drawable.tab_map_pressed,
R.drawable.tab_favorites_pressed,
R.drawable.tab_profile_pressed
};
public static FragmentManager fragmentManager;
private Window window;
@Override
protected void onStart() {
super.onStart();
GoogleAnalytics.getInstance(this).reportActivityStart(this);
}
@Override
protected void onStop() {
super.onStop();
GoogleAnalytics.getInstance(this).reportActivityStop(this);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
fragmentManager = getSupportFragmentManager();
Typeface semiBold = Typeface.createFromAsset(getAssets(), "fonts/GillSans-SemiBold.ttf");
Typeface light = Typeface.createFromAsset(getAssets(), "fonts/GillSans-Light.ttf");
Typeface bold = Typeface.createFromAsset(getAssets(), "fonts/GillSans-Bold.ttf");
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
viewPager = (ViewPager) findViewById(R.id.viewpager);
viewPager.setPageTransformer(true, new ParallaxPagerTransformer(R.id.parallax_content));
viewPager.setOffscreenPageLimit(1);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
switch (tab.getPosition()) {
case 0:
tracker.send(new HitBuilders.EventBuilder().setCategory("Tabs").setAction("Click").setLabel("Home tab").build());
viewPager.setCurrentItem(tab.getPosition());
setPressed(tab.getPosition());
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.setStatusBarColor(getResources().getColor(R.color.colorSecondaryDark));
}
break;
case 1:
viewPager.setCurrentItem(tab.getPosition());
setPressed(tab.getPosition());
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.setStatusBarColor(getResources().getColor(R.color.colorSecondaryDark));
}
break;
case 2:
viewPager.setCurrentItem(tab.getPosition());
setPressed(tab.getPosition());
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.setStatusBarColor(getResources().getColor(R.color.colorSecondaryDark));
}
break;
case 3:
viewPager.setCurrentItem(tab.getPosition());
setPressed(tab.getPosition());
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
window.setStatusBarColor(getResources().getColor(R.color.colorPrimaryDark));
}
break;
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
contactUs = (Button) findViewById(R.id.contact);
contactUs.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tracker.send(new HitBuilders.EventBuilder().setCategory("Navigation Drawer").setAction("Click").setLabel("Contact Us").build());
startActivity(new Intent(MainActivity.this, ContactUsActivity.class));
}
});
visitOurSite = (Button) findViewById(R.id.web);
visitOurSite.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Uri uri = Uri.parse("http://landing.vamospues.co");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
});
settings = (LinearLayout) findViewById(R.id.settings_button);
TextView settingsLabel = (TextView) settings.getChildAt(1);
settingsLabel.setTypeface(semiBold);
settings.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, SettingsActivity.class));
finish();
}
});
booking = (LinearLayout) findViewById(R.id.booking_button);
booking.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, BookingActivity.class));
}
});
TextView reservationsLabel = (TextView) booking.getChildAt(1);
reservationsLabel.setTypeface(semiBold);
about = (LinearLayout) findViewById(R.id.about_button);
TextView aboutLabel = (TextView) about.getChildAt(1);
aboutLabel.setTypeface(semiBold);
about.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tracker.send(new HitBuilders.EventBuilder().setCategory("Navigation Drawer").setAction("Click").setLabel("About").build());
startActivity(new Intent(MainActivity.this, AboutActivity.class));
}
});
setupTabIcons();
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
drawer.openDrawer(findViewById(R.id.drawer_content));
}
private void setPressed(int i) {
if (i==0){
tabLayout.getTabAt(0).setIcon(tabIconsSelected[0]);
tabLayout.getTabAt(1).setIcon(tabIconsUnselected[1]);
tabLayout.getTabAt(2).setIcon(tabIconsUnselected[2]);
tabLayout.getTabAt(3).setIcon(tabIconsUnselected[3]);
}
if (i==1){
tabLayout.getTabAt(0).setIcon(tabIconsUnselected[0]);
tabLayout.getTabAt(1).setIcon(tabIconsSelected[1]);
tabLayout.getTabAt(2).setIcon(tabIconsUnselected[2]);
tabLayout.getTabAt(3).setIcon(tabIconsUnselected[3]);
}
if (i==2){
tabLayout.getTabAt(0).setIcon(tabIconsUnselected[0]);
tabLayout.getTabAt(1).setIcon(tabIconsUnselected[1]);
tabLayout.getTabAt(2).setIcon(tabIconsSelected[2]);
tabLayout.getTabAt(3).setIcon(tabIconsUnselected[3]);
}
if (i==3){
tabLayout.getTabAt(0).setIcon(tabIconsUnselected[0]);
tabLayout.getTabAt(1).setIcon(tabIconsUnselected[1]);
tabLayout.getTabAt(2).setIcon(tabIconsUnselected[2]);
tabLayout.getTabAt(3).setIcon(tabIconsSelected[3]);
}
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIconsSelected[0]);
tabLayout.getTabAt(1).setIcon(tabIconsUnselected[1]);
tabLayout.getTabAt(2).setIcon(tabIconsUnselected[2]);
tabLayout.getTabAt(3).setIcon(tabIconsUnselected[3]);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new FilterFragment(), "ONE");
adapter.addFrag(new MapFragment(), "TWO");
adapter.addFrag(new FavoritesFragment(), "THREE");
adapter.addFrag(new ProfileFragment(), "FOUR");
viewPager.setAdapter(adapter);
}
}
FRAGMENT D1
public class ProfileDetailFragment extends Fragment {
private View rootView; RotateLoading loader;
private CircleImageView profilePic; ScrollView profileContainer;
private String id, name, mail, birthday, phone, url;
private TextView nameLabel, mailLabel, birthdayLabel, phoneLabel;
private Bitmap picture;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (rootView != null) {
ViewGroup parent = (ViewGroup) rootView.getParent();
if (parent != null)
parent.removeView(rootView);
}
try {
rootView = inflater.inflate(R.layout.profile_detail_fragment, container, false);
} catch (InflateException e) {
}
if(ParseUser.getCurrentUser() == null){
FragmentTransaction trans = getChildFragmentManager()
.beginTransaction();
trans.replace(R.id.profile_frame, new ProfileFragment());
trans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
trans.commit();
}
loader = (RotateLoading) rootView.findViewById(R.id.loading);
profileContainer = (ScrollView) rootView.findViewById(R.id.profile_container);
profileContainer.setVisibility(View.GONE);
nameLabel = (TextView) rootView.findViewById(R.id.name_label);
mailLabel = (TextView) rootView.findViewById(R.id.mail_label);
birthdayLabel = (TextView) rootView.findViewById(R.id.birthday_label);
phoneLabel = (TextView) rootView.findViewById(R.id.phone_label);
profilePic = (CircleImageView) rootView.findViewById(R.id.profile_pic);
this.rootView.setFocusableInTouchMode(true);
this.rootView.requestFocus();
this.rootView.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() != KeyEvent.ACTION_DOWN) {
final MaterialDialog mMaterialDialog = new MaterialDialog(getActivity());
mMaterialDialog.setTitle("LOG OUT")
.setMessage("If you log out right now, you will not be able to make a booking")
.setPositiveButton("OK", new View.OnClickListener() {
@Override
public void onClick(View v) {
ParseUser user = ParseUser.getCurrentUser();
user.logOut();
mMaterialDialog.dismiss();
FragmentTransaction trans = getFragmentManager()
.beginTransaction();
trans.replace(R.id.profile_frame, new ProfileFragment());
trans.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
trans.commit();
}
})
.setNegativeButton("CANCEL", new View.OnClickListener() {
@Override
public void onClick(View v) {
mMaterialDialog.dismiss();
}
});
mMaterialDialog.show();
return true;
}
switch (keyCode) {
case KeyEvent.KEYCODE_1:
break;
case KeyEvent.KEYCODE_2:
break;
case KeyEvent.KEYCODE_3:
break;
}
return true;
}
});
return rootView;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
new RemoteDataTask().execute();
super.onViewCreated(view, savedInstanceState);
}
public class RemoteDataTask extends AsyncTask<Void,Void,Void>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
loader.start();
}
@Override
protected Void doInBackground(Void... params) {
ParseUser user = ParseUser.getCurrentUser();
id = user.get("id").toString();
name = user.get("name").toString();
mail = user.getEmail();
birthday = user.get("birthday").toString();
phone = user.get("phone").toString();
url = user.get("pic_url").toString();
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
loader.stop();
profileContainer.setVisibility(View.VISIBLE);
Picasso.with(getActivity()).load(url).into(profilePic);
birthdayLabel.setText(birthday);
mailLabel.setText(mail);
nameLabel.setText(name);
phoneLabel.setText(phone);
}
}
}
感谢您的帮助：）
答案 0 :(得分：0)
这是您正在创建的一个非常奇怪的架构项目。在任何情况下，您都没有真正处理后退事件，您在D1中处理任何类型的按键。这是一个问题，但另一个问题是所有碎片同时存在，即使你只能看到它。您需要做的是正确处理onBackPressed()（该方法存在于活动上，而不是片段上）
要处理它，您需要跟踪当前显示的片段，并检查是否将事件传递给片段。因为onBackPressed没有遵循通常的事件签名，所以我们不能简单地返回false来说不要让事件传播，所以你需要从你的D片段中移除听众（我会去现在假设是ProfileFragment），并将代码放入您自己的方法中（让我们假设你也称之为onBackPressed）
关于活动：
@Override
public void onBackPressed() {
//NOTE: I havent checked if getSelectedPosition exists, so track it however you want
if ( viewPager.getSelectedPosition() == 3 ) {
((ProfileFragment) profileFragment).onBackPressed();
} else {
super.onBackPressed();
}
}
然后在ProfileFragment / D
public void onBackPressed() {
final MaterialDialog mMaterialDialog = new MaterialDialog(getActivity());
...
mMaterialDialog.show();
}