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MainActivityのアプリを構築しています（FragmentActivity）.3つのタブを持つActionBarがあります。各タブで、ParentFragmentを添付して、内部ページ間のスワイプを制御する必要があります。結果は、ユーザーがParentFragmentの異なるインスタンスから変更する必要があるタブを押して、スワイプすると、ParentFragmentの中のTextViewFragmentsの間で変更する必要があります。
3つのタブを完全に切り替えることができますが、ParentFragmentが正しく表示されないという問題があります.DoorCatビューにonCreate()、onCreateView()、onViewCreated()の機能が表示されないため作成されていないようです。
私はこの問題がカスタムTabListenerクラスとその関数にあると思いますが、問題の内容を実際に理解することはできません。私は多くのサイトを検索しようとしましたが、多くの例を検討しましたが、いずれも同じ状況に関連していませんでした。
私は何が間違っているのでしょうか、私はここで何が間違っていますか？Android：ActionBar、TabListener、およびsupport.v4.Fragment
これは私のMainActivityです：
import java.util.Random;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.viewpagerindicator.PageIndicator;
public class MainActivity extends FragmentActivity {
MyAdapter mAdapter;
ViewPager mPager;
PageIndicator mIndicator;
private View mCustomView;
private static final Random RANDOM = new Random();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the action bar.
ActionBar.LayoutParams params = new ActionBar.LayoutParams(
ActionBar.LayoutParams.MATCH_PARENT,
ActionBar.LayoutParams.MATCH_PARENT, Gravity.CENTER);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayUseLogoEnabled(false);
actionBar.setDisplayShowHomeEnabled(false);
actionBar.addTab(actionBar
.newTab()
.setIcon(getIcon(0, true))
.setTabListener(
new TabListener<ParentFragment>(this, "home",
ParentFragment.class)));
actionBar.addTab(actionBar
.newTab()
.setIcon(getIcon(1, false))
.setTabListener(
new TabListener<ParentFragment>(this, "apps",
ParentFragment.class)));
actionBar.addTab(actionBar
.newTab()
.setIcon(getIcon(2, false))
.setTabListener(
new TabListener<ParentFragment>(this, "settings",
ParentFragment.class)));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
}
public static class TabListener<T extends Fragment> implements
ActionBar.TabListener {
private Fragment mFragment;
private final FragmentActivity mActivity;
private final String mTag;
private final Class<T> mClass;
private final Bundle mArgs;
private FragmentTransaction fft;
public static final String TAG = TabListener.class.getSimpleName();
public TabListener(FragmentActivity activity, String tag, Class<T> clz) {
this(activity, tag, clz, null);
}
public TabListener(FragmentActivity activity, String tag, Class<T> clz,
Bundle args) {
mActivity = activity;
mTag = tag;
mClass = clz;
mArgs = args;
mFragment = mActivity.getSupportFragmentManager()
.findFragmentByTag(mTag);
if (mFragment != null && !mFragment.isDetached()) {
fft = mActivity.getSupportFragmentManager().beginTransaction();
fft.detach(mFragment);
fft.commit();
}
}
public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) {
System.out.println(TAG + (" - ") + " -> mTag "
+ mTag + " selected!");
fft = mActivity.getSupportFragmentManager().beginTransaction();
if (mFragment == null) {
mFragment = Fragment.instantiate(mActivity, mClass.getName());
fft.add(android.R.id.content, mFragment, mTag);
} else {
System.out.println(TAG + (" - ") + " -> Fragment con mTag = " + mTag
+ " trovato con tag!");
fft.attach(mFragment);
fft.commit();
}
}
@Override
public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) {
}
@Override
public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {
mFragment = mActivity.getSupportFragmentManager()
.findFragmentByTag(mTag);
System.out.println(TAG + (" - ") + " -> mTag "
+ mTag + " unselected!");
if (mFragment != null && !mFragment.isDetached()) {
fft = mActivity.getSupportFragmentManager().beginTransaction();
fft.detach(mFragment);
fft.commit();
}
}
}
public Drawable getIcon(int tabPosition, boolean selected) {
switch (tabPosition) {
case 0:
return getResources().getDrawable(R.drawable.actionbar_home);
case 1:
return getResources().getDrawable(R.drawable.actionbar_apps);
case 2:
return getResources().getDrawable(R.drawable.actionbar_settings);
}
return null;
}
}
そして、これは今android.support.v4.app.Fragmentクラスをexteds私ParentFragmentです：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.viewpagerindicator.IconPageIndicator;
import com.viewpagerindicator.PageIndicator;
public class ParentFragment extends Fragment {
public static final String TAG = ParentFragment.class.getSimpleName();
MyAdapter fragmentAdapter;
ViewPager mPager;
PageIndicator mIndicator;
public static ParentFragment newInstance() {
System.out.println(TAG + " - newInstance()");
System.out.println(TAG + " - " + methodName());
ParentFragment fragment = new ParentFragment();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
System.out.println(TAG + " - onCreate()");
System.out.println(TAG + " - " + methodName());
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
System.out.println(TAG + " - onCreateView()");
System.out.println(TAG + " - " + methodName());
fragmentAdapter = new MyAdapter(getFragmentManager());
View view = inflater.inflate(R.layout.simple_icons, container, false);
mPager = (ViewPager) view.findViewById(R.id.pager);
mPager.setAdapter(fragmentAdapter);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
System.out.println(TAG + " - onViewCreated()");
System.out.println(TAG + " - " + methodName());
super.onViewCreated(view, savedInstanceState);
mIndicator = (IconPageIndicator) getActivity().findViewById(R.id.indicator);
mIndicator.setViewPager(mPager);
}
}
これはMyAdapterクラスです：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import com.viewpagerindicator.IconPagerAdapter;
public class MyAdapter extends PagerAdapter {
FragmentManager myFragmentMgr;
private FragmentTransaction mCurTransaction;
protected static final String[] CONTENT = new String[] { "This", "Is", "A", "Test", };
protected static final int[] ICONS = new int[] {
R.drawable.icon_page_indicator,
R.drawable.icon_page_indicator,
R.drawable.icon_page_indicator,
R.drawable.perm_group_calendar,
R.drawable.perm_group_camera,
R.drawable.perm_group_device_alarms,
R.drawable.perm_group_location
};
private int mCount = CONTENT.length;
public MyAdapter(FragmentManager fm) {
super();
myFragmentMgr = fm;
}
@Override
public int getCount() {
return 3;
}
@Override
public Object instantiateItem(ViewGroup viewGroup, int position) {
ParentFragment fragment = ParentFragment.newInstance();
return fragment;
}
@Override
public void destroyItem(ViewGroup viewGroup, int position, Object obj) {
if (mCurTransaction == null) {
mCurTransaction = myFragmentMgr.beginTransaction();
}
mCurTransaction.detach((Fragment)obj);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return false;
}
public Fragment getItem(int position) {
Bundle args = new Bundle();
args.putInt(TextViewFragment.POSITION_KEY, position);
return TextViewFragment.newInstance(args);
}
@Override
public CharSequence getPageTitle(int position) {
return "Fragment # " + position;
}
public int getIconResId(int index) {
return ICONS[index % ICONS.length];
}
public void setCount(int count) {
if (count > 0 && count <= 10) {
mCount = count;
notifyDataSetChanged();
}
}
}
最後にTextViewFragmentクラス：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
public class TextViewFragment extends Fragment {
public static final String POSITION_KEY = "POSITION";
public static final String TITLE_KEY = "TITLE";
public static TextViewFragment newInstance(Bundle args) {
TextViewFragment fragment = new TextViewFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_test, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
TextView textview = (TextView) view.findViewById(R.id.textViewPosition);
final int position;
if (getArguments() != null) {
position = getArguments().getInt(POSITION_KEY);
textview.setText(Integer.toString(position));
} else {
position = 0;
textview.setText("Child Fragment");
}
textview.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "Clicked Position: " + position,
Toast.LENGTH_LONG).show();
}
});
}
}
----- EDIT：SOLUTION -----
私は「低評判」による自分の質問に答えることはできませんが、私はとにかく誰かを助けるために解決策を共有そうでなければ、いくつかの票を回収してほしい。
私は最終的に私のために働く方法を見つけました。これは、同じ問題を経験している誰にとっても役立つことを願っています。 私は疑問に、この問題はTabListenerにありました。基本的な違いは、次の行の各commit()後に加えた
public static class TabListener<T extends Fragment> implements
ActionBar.TabListener {
private Fragment mFragment;
private final FragmentActivity mActivity;
private final String mTag;
private final Class<T> mClass;
private final Bundle mArgs;
private FragmentTransaction fft;
public TabListener(FragmentActivity activity, String tag, Class<T> clz) {
this(activity, tag, clz, null);
}
public TabListener(FragmentActivity activity, String tag, Class<T> clz,
Bundle args) {
mActivity = activity;
mTag = tag;
mClass = clz;
mArgs = args;
System.out.println(TAG + " - " + methodName() + " - Constructor of TabListener -> mTag = "
+ mTag);
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
mFragment = mActivity.getSupportFragmentManager()
.findFragmentByTag(mTag);
if (mFragment != null && !mFragment.isDetached()) {
fft = mActivity.getSupportFragmentManager().beginTransaction();
fft.detach(mFragment);
fft.commit();
mActivity.getSupportFragmentManager()
.executePendingTransactions();
}
}
public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) {
Fragment tmp = mActivity.getSupportFragmentManager()
.findFragmentByTag(mTag);
fft = mActivity.getSupportFragmentManager().beginTransaction();
if (mFragment == null) {
System.out.println(TAG + " - " + methodName() + " - add mFragment " + mTag);
// If not, instantiate and add it to the activity
mFragment = Fragment.instantiate(mActivity, mClass.getName());
fft.add(android.R.id.content, mFragment, mTag);
fft.commit();
mActivity.getSupportFragmentManager()
.executePendingTransactions();
} else {
System.out.println(TAG + " - " + methodName() + " - attach mFragment " + mTag);
// If it exists, simply attach it in order to show it
fft.attach(mFragment);
fft.commit();
mActivity.getSupportFragmentManager()
.executePendingTransactions();
}
}
@Override
public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) {
System.out.println(TAG + " - " + methodName() + " - mFragment " + mTag);
}
@Override
public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) {
mFragment = mActivity.getSupportFragmentManager()
.findFragmentByTag(mTag);
if (mFragment != null && !mFragment.isDetached()) {
System.out.println(TAG + " - " + methodName() + " - detach mFragment " + mTag);
fft = mActivity.getSupportFragmentManager().beginTransaction();
fft.detach(mFragment);
fft.commit();
mActivity.getSupportFragmentManager()
.executePendingTransactions();
}
}
public static final String TAG = TabListener.class.getSimpleName();
private static final int CLIENT_CODE_STACK_INDEX;
static {
// Finds out the index of "this code" in the returned stack trace -
// funny but it differs in JDK 1.5 and 1.6
int i = 0;
for (StackTraceElement ste : Thread.currentThread().getStackTrace()) {
i++;
if (ste.getClassName().equals(TabListener.class.getName())) {
break;
}
}
CLIENT_CODE_STACK_INDEX = i;
}
public static String methodName() {
if (Thread.currentThread().getStackTrace().length < CLIENT_CODE_STACK_INDEX)
return Thread.currentThread().getStackTrace()[CLIENT_CODE_STACK_INDEX]
.getMethodName() + "()";
else
return new String(
"methodName() - stackTrace index is out of bound");
}
}
mActivity.getSupportFragmentManager().executePendingTransactions();
この問題は本当に悪い文書化されたが、おそらく唯一で起こる私の問題は、このコードでその部分を変更すること解決しました私はこの解決策が同じ問題を抱えている誰かに時間を節約することを願っています！
：私は少しそれをクリーンアップして、溶液中の未使用の変数がいくつかありました。とにかく、私はその呼び出しなしであなたのコードを使用し、それは働いた。 – Axxiss