我正在开发一个Android应用程序，我正在使用FragmentTabHost，我正在为每个选项卡维护一个容器，但是当我重新点击选项卡时，我遇到了重新加载Tabcontent的问题。
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTabHost;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabHost.TabSpec;
import android.widget.TabWidget;
import android.widget.TextView;
import com.eDeftsoft.FragmentsContainer.AboutContainerFragment;
import com.eDeftsoft.FragmentsContainer.BaseContainerFragment;
import com.eDeftsoft.FragmentsContainer.CityContainerFragment;
import com.eDeftsoft.FragmentsContainer.HomeContainerFragment;
import com.eDeftsoft.FragmentsContainer.PhotosContainerFragment;
import com.eDeftsoft.Utility.CommonDialogues;
public class HomeScreen extends FragmentActivity {
private static final String TAB_1_TAG = "Home";
private static final String TAB_2_TAG = "Photos";
private static final String TAB_3_TAG = "City";
private static final String TAB_4_TAG = "About";
private FragmentTabHost mTabHost;
TabWidget tbwidget;
HomeContainerFragment homeFragment;
PhotosContainerFragment photosFragment;
CityContainerFragment cityFragment;
AboutContainerFragment aboutFragment;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home_screen);
initView();
homeFragment = new HomeContainerFragment();
photosFragment = new PhotosContainerFragment();
cityFragment = new CityContainerFragment();
aboutFragment = new AboutContainerFragment();
}
private void initView() {
mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
mTabHost.addTab(setMyCustomIndicator(this, TAB_1_TAG, "Home"),
HomeContainerFragment.class, null);
mTabHost.addTab(setMyCustomIndicator(this, TAB_2_TAG, "Photos"),
PhotosContainerFragment.class, null);
mTabHost.addTab(setMyCustomIndicator(this, TAB_3_TAG, "City"),
CityContainerFragment.class, null);
mTabHost.addTab(setMyCustomIndicator(this, TAB_4_TAG, "About"),
AboutContainerFragment.class, null);
setTabHostColors();
mTabHost.setCurrentTabByTag("TAB_1_TAG");
mTabHost.setCurrentTab(0);
mTabHost.getTabWidget().setShowDividers(LinearLayout.SHOW_DIVIDER_NONE);
mTabHost.getTabWidget().setStripEnabled(false);
tbwidget = mTabHost.getTabWidget();
/*I had Also used This But getting error when i reclick on sametabs*/
// mTabHost.setOnTabChangedListener(new OnTabChangeListener() {
//
// @Override
// public void onTabChanged(String tabId) {
// // TODO Auto-generated method stub
// if (tabId.equals(TAB_1_TAG)) {
// pushFragments(TAB_1_TAG, homeFragment);
// } else if (tabId.equals(TAB_2_TAG)) {
// pushFragments(TAB_1_TAG, photosFragment);
//
// } else if (tabId.equals(TAB_3_TAG)) {
// pushFragments(TAB_1_TAG, cityFragment);
// } else {
// pushFragments(TAB_1_TAG, aboutFragment);
// }
//
// }
// });
}
/*
* insert the fragment into the FrameLayout
*/
// public void pushFragments(String tag, Fragment class1) {
//
// FragmentManager manager = getSupportFragmentManager();
// FragmentTransaction ft = manager.beginTransaction();
//
// ft.replace(R.id.realtabcontent, class1);
// ft.commit();
// }
public TabSpec setMyCustomIndicator(Context con, String tag,
String labeltext) {
TabHost.TabSpec spec = mTabHost.newTabSpec(tag);
View tabIndicator = LayoutInflater.from(this).inflate(
R.layout.tab_indicator, null, false);
((TextView) tabIndicator.findViewById(R.id.title)).setText(labeltext);
// ((ImageView) tabIndicator.findViewById(R.id.icon))
// .setImageResource(resid);
return spec.setIndicator(tabIndicator);
}
@Override
public void onBackPressed() {
boolean isPopFragment = false;
String currentTabTag = mTabHost.getCurrentTabTag();
FragmentManager fm = getSupportFragmentManager();
if (currentTabTag.equals(TAB_1_TAG)) {
for (int entry = 0; entry < fm.getBackStackEntryCount(); entry++) {
String ide = fm.getBackStackEntryAt(entry).getName();
Log.i("TAG" + TAB_1_TAG, "Found fragment: " + ide);
}
isPopFragment = ((BaseContainerFragment) getSupportFragmentManager()
.findFragmentByTag(TAB_1_TAG)).popFragment();
}
else if (currentTabTag.equals(TAB_2_TAG)) {
for (int entry = 0; entry < fm.getBackStackEntryCount(); entry++) {
String ide = fm.getBackStackEntryAt(entry).getName();
Log.i("TAG" + TAB_2_TAG, "Found fragment: " + ide);
}
isPopFragment = ((BaseContainerFragment) getSupportFragmentManager()
.findFragmentByTag(TAB_2_TAG)).popFragment();
}
else if (currentTabTag.equals(TAB_3_TAG)) {
for (int entry = 0; entry < fm.getBackStackEntryCount(); entry++) {
String ide = fm.getBackStackEntryAt(entry).getName();
Log.i("TAG" + TAB_3_TAG, "Found fragment: " + ide);
}
isPopFragment = ((BaseContainerFragment) getSupportFragmentManager()
.findFragmentByTag(TAB_3_TAG)).popFragment();
}
else if (currentTabTag.equals(TAB_4_TAG)) {
for (int entry = 0; entry < fm.getBackStackEntryCount(); entry++) {
String ide = fm.getBackStackEntryAt(entry).getName();
Log.i("TAG" + TAB_4_TAG, "Found fragment: " + ide);
}
isPopFragment = ((BaseContainerFragment) getSupportFragmentManager()
.findFragmentByTag(TAB_4_TAG)).popFragment();
}
if (!isPopFragment) {
CommonDialogues.showAlertDialog(HomeScreen.this,
"Application Will Exit", "Do you Want to Exit");
}
}
private void setTabHostColors() {
for (int i = 0; i < mTabHost.getTabWidget().getChildCount(); i++) {
mTabHost.getTabWidget().getChildAt(i)
.setBackgroundColor(Color.TRANSPARENT);
final TextView tv = (TextView) mTabHost.getTabWidget()
.getChildAt(i).findViewById(android.R.id.title);
if (tv == null)
continue;
else
tv.setTextSize(12);
}
}
@Override
public void onDestroy() {
super.onDestroy();
mTabHost = null;
}
}
当我进入tab1的内部片段时，例如来自fragmentA - ＆gt;片段B和来自片段B - ＆gt; fragmentC（最后我在fragmentC），当我再次选择Tab1时，我想重新加载标签，FragmentA应该是Apper。 任何帮助将不胜感激。我已经浏览了一些教程和代码库但是找不到我的问题的解决方案。 如何在再次单击第一个选项卡时重新加载第一个选项卡的内容。
答案 0 :(得分：2)
I had asked a question
When i go in inner fragments of tab1 , like from fragmentA -> Fragment B and From FragmentB -> fragmentC (and finally i am at fragmentC) , When i select Tab1 again i want to reload tabs and FragmentA should Apper.
I searched a lot and come to the conclusion , We can implement OnTabChangeListner and when any tab is clicked again we can reset it.(I was having need to reload tab when it is clicked 2nd time)
<!--Layout for Tabs -->
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<TabHost
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:baselineAligned="false"
android:orientation="vertical" >
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<!-- android:background="@drawable/footer" -->
<FrameLayout
android:id="@+id/tabframeLayout"
android:layout_width="fill_parent"
android:layout_height="@dimen/tabframe_height"
android:layout_marginTop="1dp"
android:background="#FBFAFA" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="@dimen/tab_height"
android:background="#F2F0F0" >
</TabWidget>
</FrameLayout>
</LinearLayout>
</TabHost>
</RelativeLayout>
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TextView;
import com.abc.Fragments.FragmentA;
import com.abc.Fragments.FragmentA1;
import com.abc.Fragments.FragmentA2;
import com.abc.Fragments.FragmentA3;
import com.abc.Utility.CommonDialogues;
public class MyHomeScreen extends FragmentActivity implements
OnTabChangeListener {
private TabHost tabHost;
private String currentSelectedTab;
private HashMap<String, ArrayList<Fragment>> hMapTabs;
final int TEXT_ID = 100;
final String arrTabLabel[] = { "FragmentA", "FragmentA1", "FragmentA2",
"FragmentA3" };
final static int arrIcons[] = { R.drawable.homee, R.drawable.photoi,
R.drawable.cityi, R.drawable.abouti };
private MyTabView arrTabs[] = new MyTabView[4];
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_home_screen);
hMapTabs = new HashMap<String, ArrayList<Fragment>>();
hMapTabs.put(AppConstant.TAB_1_TAG, new ArrayList<Fragment>());
hMapTabs.put(AppConstant.TAB_2_TAG, new ArrayList<Fragment>());
hMapTabs.put(AppConstant.TAB_3_TAG, new ArrayList<Fragment>());
hMapTabs.put(AppConstant.TAB_4_TAG, new ArrayList<Fragment>());
tabHost = (TabHost) findViewById(android.R.id.tabhost);
tabHost.setOnTabChangedListener(this);
tabHost.setup();
TabHost.TabSpec spec = tabHost.newTabSpec(AppConstant.TAB_1_TAG);
tabHost.setCurrentTab(0);
arrTabs[0] = new MyTabView(this, 0, arrTabLabel[0]);
spec.setContent(new TabHost.TabContentFactory() {
public View createTabContent(String tag) {
return findViewById(android.R.id.tabcontent);
}
});
spec.setIndicator(arrTabs[0]);
tabHost.addTab(spec);
spec = tabHost.newTabSpec(AppConstant.TAB_2_TAG);
arrTabs[1] = new MyTabView(this, 1, arrTabLabel[1]);
spec.setContent(new TabHost.TabContentFactory() {
public View createTabContent(String tag) {
return findViewById(android.R.id.tabcontent);
}
});
spec.setIndicator(arrTabs[1]);
tabHost.addTab(spec);
spec = tabHost.newTabSpec(AppConstant.TAB_3_TAG);
arrTabs[2] = new MyTabView(this, 2, arrTabLabel[2]);
spec.setContent(new TabHost.TabContentFactory() {
public View createTabContent(String tag) {
return findViewById(android.R.id.tabcontent);
}
});
spec.setIndicator(arrTabs[2]);
tabHost.addTab(spec);
spec = tabHost.newTabSpec(AppConstant.TAB_4_TAG);
arrTabs[3] = new MyTabView(this, 3, arrTabLabel[3]);
spec.setContent(new TabHost.TabContentFactory() {
public View createTabContent(String tag) {
return findViewById(android.R.id.tabcontent);
}
});
spec.setIndicator(arrTabs[3]);
tabHost.addTab(spec);
// set background for Selected Tab
TextView tv = (TextView) tabHost.getCurrentTabView().findViewById(
TEXT_ID);
// tv.setTextColor(Color.parseColor("#2882C6"));
View iv = (View) tabHost.getCurrentTabView();
// iv.setBackgroundResource(R.color.green);
// Listner for Tab 1//
tabHost.getTabWidget().getChildAt(0)
.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (hMapTabs.size() > 0) {
if (tabHost.getTabWidget().getChildAt(0)
.isSelected()) {
if (hMapTabs.get(AppConstant.TAB_1_TAG).size() > 1) {
resetFragment();
}
}
tabHost.getTabWidget().setCurrentTab(0);
tabHost.setCurrentTab(0);
}
}
});
/* Listner for Tab 2 */
tabHost.getTabWidget().getChildAt(1)
.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (hMapTabs.size() > 0) {
if (tabHost.getTabWidget().getChildAt(1)
.isSelected()) {
if (hMapTabs.get(AppConstant.TAB_2_TAG).size() > 1) {
resetFragment();
}
}
tabHost.getTabWidget().setCurrentTab(1);
tabHost.setCurrentTab(1);
}
}
});
/* Listner for Tab 3 */
tabHost.getTabWidget().getChildAt(2)
.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (hMapTabs.size() > 0) {
if (tabHost.getTabWidget().getChildAt(2)
.isSelected()) {
if (hMapTabs.get(AppConstant.TAB_3_TAG).size() > 1) {
resetFragment();
}
}
tabHost.getTabWidget().setCurrentTab(2);
tabHost.setCurrentTab(2);
}
}
});
/* Listner for Tab 4 */
tabHost.getTabWidget().getChildAt(3)
.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (hMapTabs.size() > 0) {
if (tabHost.getTabWidget().getChildAt(3)
.isSelected()) {
if (hMapTabs.get(AppConstant.TAB_4_TAG).size() > 1) {
resetFragment();
}
}
tabHost.getTabWidget().setCurrentTab(3);
tabHost.setCurrentTab(3);
}
}
});
}
/* Method for adding fragment */
public void addFragments(String tabName, Fragment fragment,
boolean animate, boolean add) {
if (add) {
hMapTabs.get(tabName).add(fragment);
}
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction ft = manager.beginTransaction();
if (animate) {
ft.setCustomAnimations(R.animator.slide_in_right,
R.animator.slide_out_left);
}
ft.replace(android.R.id.tabcontent, fragment);
ft.commit();
}
/* Method for remove fragment */
public void removeFragment() {
Fragment fragment = hMapTabs.get(currentSelectedTab).get(
hMapTabs.get(currentSelectedTab).size() - 2);
hMapTabs.get(currentSelectedTab).remove(
hMapTabs.get(currentSelectedTab).size() - 1);
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction ft = manager.beginTransaction();
ft.setCustomAnimations(R.animator.slide_in_left,
R.animator.slide_out_right);
ft.replace(android.R.id.tabcontent, fragment);
ft.commit();
}
// reset frgment used when clicked on same tab
private void resetFragment() {
Fragment fragment = hMapTabs.get(currentSelectedTab).get(0);
hMapTabs.get(currentSelectedTab).clear();
hMapTabs.get(currentSelectedTab).add(fragment);
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction ft = manager.beginTransaction();
ft.setCustomAnimations(R.animator.slide_in_left,
R.animator.slide_out_right);
ft.replace(android.R.id.tabcontent, fragment);
ft.commit();
}
@Override
public void onBackPressed() {
if (hMapTabs.get(currentSelectedTab).size() <= 1) {
// super.onBackPressed();
CommonDialogues.showAlertDialog(MyHomeScreen.this,
"Application Will Exit", "Do you Want to Exit");
} else {
removeFragment();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (hMapTabs.get(currentSelectedTab).size() == 0) {
return;
}
hMapTabs.get(currentSelectedTab)
.get(hMapTabs.get(currentSelectedTab).size() - 1)
.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onTabChanged(String tabName) {
// TODO Auto-generated method stub
currentSelectedTab = tabName;
// make iteration for unselected tab and make normal background
for (int i = 0; i < tabHost.getTabWidget().getChildCount(); i++) {
TextView tv = (TextView) tabHost.getTabWidget().getChildAt(i)
.findViewById(TEXT_ID);
tv.setTextColor(Color.parseColor("#BDBDBD"));
View iv = (View) tabHost.getTabWidget().getChildAt(i);
iv.setBackgroundColor(0x00000000);
}
TextView tv = (TextView) tabHost.getCurrentTabView().findViewById(
TEXT_ID); // for Selected Tab
tv.setTextColor(Color.parseColor("#2882C6"));
View iv = (View) tabHost.getCurrentTabView();
if (hMapTabs.get(tabName).size() == 0) {
if (tabName.equals(AppConstant.TAB_1_TAG)) {
addFragments(tabName, new FragmentA(), false, true);
} else if (tabName.equals(AppConstant.TAB_2_TAG)) {
addFragments(tabName, new FragmentA1(), false, true);
} else if (tabName.equals(AppConstant.TAB_3_TAG)) {
addFragments(tabName, new FragmentA2(), false, true);
} else if (tabName.equals(AppConstant.TAB_4_TAG)) {
addFragments(tabName, new FragmentA3(), false, true);
}
} else {
addFragments(
tabName,
hMapTabs.get(tabName).get(hMapTabs.get(tabName).size() - 1),
false, false);
}
switch (tabHost.getCurrentTab()) {
case 0:
// we can also set background color of tabview
// iv.setBackgroundResource(R.color.green);
break;
case 1:
// iv.setBackgroundResource(R.color.red);
break;
case 2:
// iv.setBackgroundResource(R.color.yellow);
break;
case 3:
// iv.setBackgroundResource(R.color.twitter);
break;
}
}
private class MyTabView extends LinearLayout {
int nIdx = -1;
TextView tv;
public MyTabView(Context c, int drawableIdx, String label) {
super(c);
ImageView iv = new ImageView(c);
nIdx = drawableIdx;
// used for forground icons//
iv.setImageResource(arrIcons[nIdx]);
tv = new TextView(c);
tv.setText(label);
tv.setGravity(Gravity.BOTTOM);
tv.setTextSize(14.0f);
tv.setTypeface(null, Typeface.BOLD);
tv.setId(TEXT_ID);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT, 0.9f);
LinearLayout.LayoutParams layout = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT, 0.3f);
layout.setMargins(0, 3, 0, 0);
iv.setLayoutParams(layout);
layout.setMargins(0, 3, 0, 2);
tv.setLayoutParams(param);
tv.setTextColor(Color.parseColor("#BDBDBD"));
setOrientation(LinearLayout.VERTICAL);
setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
addView(iv);
addView(tv);
}
}
}
<!--Layout for FragmenA -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00ff00"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="TAB 1 FIRST SCREEN"
android:textColor="@color/dark_blue"
android:textSize="30sp"
android:textStyle="bold" />
<Button
android:id="@+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dip"
android:text="Go to Next Screen" />
<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" >
</EditText>
</LinearLayout>
code for fragment A ...it is extend By Basefragment
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
public class FirstScreen extends BaseFragment implements OnClickListener {
private Button btnNext;
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
Toast.makeText(getActivity(), "I am in onCreate", Toast.LENGTH_LONG).show();
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab1_firstscreen,
container, false);
btnNext = (Button) view.findViewById(R.id.btnNext);
btnNext.setOnClickListener(this);
System.out.println("replace");
return view;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
fragmentTabActivity.addFragments(Const.TAB_FIRST,
new SecondScreen(), true, true);
}
}
Code for BaseFragment is
extend this class with all sub fragment which you are going to add on (While adding fragment use myhomescreenActivity(This object) and call add Function in MyHomeScreen ):
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
public class BaseFragment extends Fragment {
protected MyHomeScreen myhomescreenActivity;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myhomescreenActivity = (MyHomeScreen) this.getActivity();
}
public boolean onBackPressed() {
return false;
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
}
}
This is the link of repository on Github for further understanding.......
https://github.com/thankimanish/TabUsingFragment
答案 1 :(得分：0)
1.您可以尝试将onCreate方法中的代码移动到onResume方法，以便每次片段到达前面时onResume中的代码都会被执行并重新加载该片段。
2.您也可以尝试重写片段的onHiddenChanged方法，并在片段变为可见时重新加载片段