我有一個嵌套片段的項目（https://github.com/checklist/NestedFragmentsRecycler）。 FragmentA位於MainActivity中，幷包含帶有適配器的RecyclerView。適配器中的每個項目都會返回FragmentB。由於我需要提供一個用於將FragmentB加載到位的ID，並且它需要是唯一的，所以我生成了我自己的ID。第一個片段顯示正常，但不幸的是，我開始滾動的那一刻，我得到一個例外，我的唯一的ID不能被發現：使用RecyclerView的Android嵌套片段
W /的ResourceType：資源獲取的名字時，沒有包裝標識 數0x00000004 E/FragmentManager：沒有爲ID 0x4 （未知）的片段FragmentB {30cad9b＃3 id = 0x4}找到視圖E/FragmentManager： 活動狀態：D/FragmentManager：本地FragmentActivity 6d29cb6 狀態：D/FragmentManager：mCreated = truemResumed = true mStopped = false mReallyStopped = false D/FragmentManager：
mLoadersStarted = true D/FragmentManager：a2d5538中的活動片段： d/FragmentManager：＃0：FragmentA {6948911＃0的id = 0x7f0b0056} d/FragmentManager：mFragmentId =＃7f0b0056 mContainerId =＃7f0b0056 MTAG =空d/FragmentManager：mState = 5 MINDEX = 0 mWho =機器人：片段：0 mBackStackNesting = 0 d/FragmentManager：
mAdded =真mRemoving =假mFromLayout =假mInLayout =假 d/FragmentManager：mHidden =假mDetached =假 mMenuVisible =真mHasMenu =假d/FragmentManager：
mRetainInstance =假mRetaining = false mUserVisibleHint = true D/FragmentManager：mFragmentManager = FragmentManager {a2d5538在 HostCallbacks {327ba76}} D/FragmentManager：
mHost = and [email protected] D/FragmentManager：mArguments = Bundle [{}] D/FragmentManager：
mContainer = android.widget.FrameLayout {ffe8877 VE ..... .... ... 128,32-2432,1496＃7f0b0056 app：id/fragmentA} D/FragmentManager：
mView = android.widget.LinearLayout {ffe8ce4 VE ..... ........ 0,0-2304,1464} D/FragmentManager：
mInnerView = android.widget.LinearLayout {ffe8ce4 VE ..... ........ 0,0-2304,1464} D/FragmentManager：子片段管理器{aa7a54d in FragmentA {6948911}}：D/FragmentManager： 中的活動片段aa7a54d：D /片段管理器：＃0：FragmentB {44d0802＃0 id = 0x1} d/FragmentManager：mFragmentId =＃1 mContainerId =＃1 MTAG =空d/FragmentManager：mState = 5 MINDEX = 0 mWho =機器人：片段：0：0 mBackStackNesting = 0 d/FragmentManager：
mAdded =真mRemoving =假mFromLayout =假mInLayout =假 d/FragmentManager：mHidden =假mDetached =假 mMenuVisible =真mHasMenu =假d/FragmentManager：
mRetainInstance =假mRetaining =假mUserVisibleHint =真 d/FragmentManager：
mFragmentManager = FragmentManager {aa7a54d in FragmentA {6948911}} D/FragmentManager：
mHost = android.support.v4.app.FragmentActivity $ HostCallbac KS @ 327ba76 d/FragmentManager：mParentFragment = FragmentA {6948911＃0 ID = 0x7f0b0056} d/FragmentManager：
mArguments =捆綁[{TEXT =這是片段B：0}] d/FragmentManager：
mContainer =機器人.widget.FrameLayout {c93513 VE ..... ........ 0,0-800,1464＃1} D /片段管理器：
mView = android.widget.LinearLayout {3899350 VE ..... ........ 0,0-800,1464} D/FragmentManager：
mInnerView = android.widget.LinearLayout {3899350 VE ..... ........ 0,0-800,1464} D/FragmentManager：Child FragmentManager {c564949 in FragmentB {44d0802 }}：d/FragmentManager：
FragmentManager其它狀態：d/FragmentManager：
[email protected]a76 d/FragmentManager：
mContainer = android.support.v4.app 。片段$ 1 @ 287a24e D/FragmentM anager：mParent = FragmentB {44d0802＃0 ID =爲0x1} d/FragmentManager：mCurState = 5 mStateSaved =假mDestroyed =假d/FragmentManager：＃1： FragmentB {d880f6f＃1的ID = 0×2} d/FragmentManager：
mFragmentId =＃2 mContainerId =＃2 MTAG =空d/FragmentManager：
mState = 5 MINDEX = 1 mWho =機器人：片段：0：1 mBackStackNesting = 0 d/FragmentManager：mAdded =真mRemoving =假 mFromLayout =假mInLayout =假d/FragmentManager：
mHidden =假mDetached =假mMenuVisible =真mHasMenu =假 d/FragmentManager：mRetainInstance =假mRetaining =假 mUserVisibleHint =真d/FragmentManager：
mFragmentManager = FragmentManager {aa7a54d在FragmentA {6948911}} d/FragmentManager：
[email protected]a76 d/FragmentManager：mParentFragment = FragmentA {6948911＃0 ID = 0x7f0b0056} D/FragmentManager：
mArguments = Bundle [{TEXT = This is Fragment B：1}] D/FragmentManager：
mContainer = android.widget.FrameLayout {67c947c VE ..... ...... .. 0,0-800,1464＃2} D/FragmentManager：
mView = android.widget.LinearLayout {c313105 VE ..... ........ 0,0-800,1464 } D /碎片管理器：
mInnerView = android.widget.LinearLayout {c313105 VE ..... ........ 0,0-800,1464} D/FragmentManager：Child FragmentManager {cbf955a in FragmentB {d880f6f}}：D/FragmentManager：
FragmentManager其它狀態：d/FragmentManager：
[email protected]a76 d/FragmentManager：
mContainer = android.support.v4.app.Fragment $ -1 @ ab0338b d/FragmentManager：mParent = FragmentB {d880f6f＃1 ID = 0×2} d/FragmentManager：mCurState = 5 mStateSaved =假mDestroyed =假d/FragmentManager：＃2： FragmentB {53c7c68＃2的ID = 0x3} d /片段管理器：
mFragmentId =＃3 mContainerId =＃3 MTAG = NULL d/FragmentManager：
mState = 5 MINDEX = 2 mWho =機器人：片段：0：2 mBackStackNesting = 0 d/FragmentManager：mAdded =真mRemoving =假 mFromLayout =假mInLayout =假d/FragmentManager：
mHidden =假mDetached =假mMenuVisible =真mHasMenu =假 d/FragmentManager：mRetainInstance =假mRetaining =假 mUserVisibleHint =真d/FragmentManager：
mFragmentManager = FragmentManager {aa7a54d在FragmentA {6948911}} D/FragmentManager：
mHost = android.support.v4.app。FragmentActivity $ HostCallbacks @ 327ba76 d/FragmentManager：mParentFragment = FragmentA {6948911＃0 ID = 0x7f0b0056} d/FragmentManager：
mArguments =捆綁[{TEXT =這是片段B：2}] d/FragmentManager：
mContainer = android.widget.FrameLayout {918d881 VE ..... ........ 0,0-800,1464＃3} D/FragmentManager：
mView = android.widget.LinearLayout {651ad26 VE。 .... ........ 0,0-800,1464} D/FragmentManager：
mInnerView = android.widget.LinearLayout {651ad26 VE ..... ........ 0,0-800,1464} D /片段管理器：兒童 片段管理器{4ec7d67 in FragmentB {53c7c68}}：D/FragmentManag ER：
FragmentManager其它國家：d/FragmentManager：
[email protected]a76 d/FragmentManager：
[email protected] d/FragmentManager：mParent = FragmentB {53c7c68＃2 ID = 0x3} d/FragmentManager：mCurState = 5 mStateSaved =假mDestroyed =假d/FragmentManager：＃3： FragmentB {30cad9b＃3的ID =爲0x4} d/FragmentManager：
mFragmentId =＃4 mContainerId =＃4 mTag = null D/FragmentManager：
mState = 1 mIndex = 3 mWho = android：fragment：0：3 mBackStackNesting = 0 d/FragmentManager：mAdded =真mRemoving =假 mFromLayout =假mInLayout =假d/FragmentManager：
mHidden =假mDetached =假mMenuVisible =真mHasMenu =假 d/FragmentManager：mRetainInstance =假mRetaining =假 mUserVisibleHint =真d/FragmentManager：
mFragmentManager = FragmentManager {aa7a54d在FragmentA {6948911}} d/FragmentManager：
[email protected]a76 d/FragmentManager：mParentFragment = FragmentA {6948911 ＃0 id = 0x7f0b0056} D/FragmentManager：
mArguments = Bundle [{TEXT = This is Fragm D/FragmentManager：
D/FragmentManager：＃0：FragmentB {44d0802＃0 id = 0x1} D/FragmentManager：＃1：FragmentB {d880f6f＃1 id = 0x2} D/FragmentManager：＃2：FragmentB {53c7c68＃2的ID = 0x3} d/FragmentManager：＃3：FragmentB {30cad9b＃3的ID =爲0x4} d/FragmentManager：FragmentManager其它狀態： d/FragmentManager：
mHost = [email protected] d/FragmentManager：
[email protected] d/FragmentManager：mParent = FragmentA {6948911＃0 ID = 0x7f0b0056 } D/FragmentManager：mCurS泰特= 5 mStateSaved =假mDestroyed =假d/FragmentManager：添加 片段：d/FragmentManager：＃0：FragmentA {6948911＃0 ID = 0x7f0b0056} d/FragmentManager：FragmentManager其它狀態： d/FragmentManager：
[email protected]a76 D/FragmentManager：
mContainer = android.support.v4.app。FragmentActivity $ HostCallbacks @ 327ba76 D/FragmentManager：mCurState = 5 mStateSaved = false mDestroyed = false I/art：部分代碼緩存收集，代碼= 30KB，數據= 27KB I/art： 代碼緩存收集後，代碼= 29KB ，數據= 27KB I/art：增加 代碼緩存容量爲128KB D/FragmentManager：查看分層結構： D/FragmentManager：com.android.internal.policy.DecorView {99b75b2 VE .... ... 0,0 -2560,1800} D/FragmentManager：
android.widget.LinearLayout {eb98903 VE .... ... 0,0-2560,1704} D/FragmentManager：android.view.ViewStub {8107080 GE ... ... 0,0-0,0＃10203ef android：id/action_mode_bar_stub} D/FragmentManager：
andro id.widget.FrameLayout {44716b9 VE .... ... 0,48-2560,1704} D/FragmentManager：
android.support.v7.widget.ActionBarOverlayLayout {7473afe VE .... ... 0,0-2560,1656＃7f0b0044 app：id/decor_content_parent} D/FragmentManager：
android.support.v7.widget.ContentFrameLayout {bc1b25f VE .... ... 0,128-2560,1656＃1020002 android ：ID /內容} d/FragmentManager：
android.widget.RelativeLayout {a4c14ac VE .... ... 0,0-2560,15287f0b0055應用：ID/activity_main} d/FragmentManager：機器人。 widget.FrameLayout {ffe8877 VE .... ... 128,32-2432,1496
7f0b0056應用：ID/fragmentA} d/FragmentManager：android.widget.LinearLayout {ffe8ce4 VE .... ... 0,0-2304,1464}
d/FragmentManager：
android.support .v7.widget.RecyclerView {9b96575 VFEDH ... F .. 0,0-2304,1464＃7f0b0057 app：id/listView} D/FragmentManager：
android.widget.LinearLayout {e58090a VE ....。 .. -19,0-781,1464} W/ResourceType：獲取資源名稱時沒有包標識符 number 0x00000001 D/FragmentManager：
android.widget.FrameLayout {c93513 VE .... ... 0， 0-800,1464＃1} d/FragmentManager：
android.widget.LinearLayout {3899350 VE .... ... 0,0-800,1464} d/FragmentManager：
android.support.v7.widget.AppCompatTextView {5f9157b V. ED .... 0,0-254,38＃7f0b0070 app：id/textView} D/FragmentManager：
android.widget.LinearLayout {7bbcf98 VE .... ... 781,0-1581 ，1464} W/ResourceType：獲取資源名稱時沒有包標識符 number 0x00000002 D/FragmentManager：
android.widget.FrameLayout {67c947c VE .... ... 0,0-800,1464＃2} D/FragmentManager：
android.widget.LinearLayout {c313105 VE .... ... 0 ，0-800,1464} D/FragmentManager：
android.support.v7.widget.AppCompatTextView {bc7e3f1 V.ED .... ... 0,0-254,38＃7f0b0070 app：id/textView } D/FragmentManager：
android.widget.LinearLayout {8f5abd6 VE .... ... 1581,0-2381,1464} W/ResourceType：獲取資源名稱時沒有包標識符 number 0x00000003 D/FragmentManager：
android.widget.FrameLayout {918d881 VE .... ... 0,0-800,1464＃3} D/FragmentManager：
android.widget.LinearLayout {651ad26 VE .... ... 0 ，0-800,1464} D/FragmentManager：
android。support.v7.widget.AppCompatTextView {8798e57 V.ED .... ... 0,0-254,38＃7f0b0070 app：id/textView} D/FragmentManager：
android.support.v7.widget.ActionBarContainer {36a4d44 V.ED .... ... 0,0-2560,128＃7f0b0045 app：id/action_bar_container} D/FragmentManager： android.support.v7.widget.Toolbar {e65ce2d VE ....。 .. 0,0-2560,1287f0b0046應用程式：ID/action_bar} d/FragmentManager：android.support.v7.widget.AppCompatTextView {9f8af62 V.ED .... ...
48 ，37-153,91} D/FragmentManager：
android.support.v7.widget.ActionMenuView {c1eb8f3 VE .... ... 2544,0-2544,128} D/FragmentManager：
android.support.v7.widget.ActionBarContextView {460f9b0 GE .... ... 0,0-0,0＃7f0b0047 app：id/action_context_bar} D/FragmentManager：
android.view.View {77e2029 V.ED .... ... 0,1704-2560,1800＃1020030 android：id/navigationBarBackground} D/FragmentManager：
android.view.View {7365fae V.ED .... ... 0,0-2560,48＃102002f android：id/statusBarBackground} D/AndroidRuntime：關閉VM E/AndroidRuntime：致命異常：主要 進程：example.com .demo，PID：8156 java.lang.IllegalArgumentException：未找到針對片段FragmentB {30cad9b的ID爲0x4（未知）的視圖＃3 = ID處android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1107） 爲0x4} 在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1295） 在機器人。 support.v4.app.BackStackRecord.run（BackStackRecord.java:801） at android.support.v4.app.FragmentManagerImpl.execPendingActions（FragmentManager.java:1682） at android.support.v4.app.FragmentManagerImpl $ 1.run （FragmentManager.java:541） at android.os.Handler.handleCallback（Handler.java:751） at android.os.Handler.dispatchMessage（Handler.java:95） at android.os.Looper.loop（Looper .java：154） at android.app.ActivityThread.main（ActivityThread.java:6119） at java.lang.reflect.Method.invoke（Native Method） at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:886） at com.android.internal.os.ZygoteInit.main （ZygoteInit.java:776） 從目標VM，地址斷開連接： '本地主機：8616'，運輸： '插座'
的2個主類是FragmentAAdapter和FragmentB（你可以看到其他類，如果你需要在混帳回購協議）：
public class FragmentAAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
FragmentA fragmentA;
Activity activity;
RecyclerView listView;
public FragmentAAdapter(FragmentA fragmentA, Activity activity, RecyclerView listView) {
this.fragmentA = fragmentA;
this.activity = activity;
this.listView = listView;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_b, parent, false);
RecyclerView.ViewHolder vh = new BoardViewHolder(v, this);
return vh;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof BoardViewHolder){
BoardViewHolder pHolder = (BoardViewHolder)holder;
pHolder.onBindViewHolder(position);
}
}
@Override
public int getItemCount() {
return 10;
}
public class BoardViewHolder extends RecyclerView.ViewHolder {
FragmentAAdapter adapter;
FragmentB fragmentB;
View view;
public BoardViewHolder(View itemView, FragmentAAdapter adapter) {
super(itemView);
this.view = itemView;
this.adapter = adapter;
}
public void onBindViewHolder(int position) {
FragmentManager fm = fragmentA.getChildFragmentManager();
if (fragmentB==null) {
Bundle bundle = new Bundle();
bundle.putString("TEXT", "This is Fragment B:" + position);
fragmentB = FragmentB.getInstance(bundle);
int boardId = generateViewId();
// switch the id of the board to be unique
View board = view.findViewById(R.id.board);
board.setId(boardId);
// now flip fragmentB
FragmentTransaction ft = fm.beginTransaction();
ft.replace(boardId, fragmentB);
ft.commit();
}
}
}
private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
public static int generateViewId() {
for (;;) {
final int result = sNextGeneratedId.get();
// aapt-generated IDs have the high byte nonzero; clamp to the range under that.
int newValue = result + 1;
if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0.
if (sNextGeneratedId.compareAndSet(result, newValue)) {
return result;
}
}
}
}
和FragmentB：
public class FragmentB extends Fragment {
View root;
Activity activity;
String text;
private TextView textView;
public static FragmentB getInstance(Bundle bundle) {
FragmentB instance = new FragmentB();
instance.setArguments(bundle);
return instance;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
activity = (Activity) getActivity();
if (getArguments()!=null) {
text = getArguments().getString("TEXT");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
root = inflater.inflate(R.layout.row, null, false);
textView = (TextView)root.findViewById(R.id.textView);
textView.setText(text);
return root;
}
}
全碼：https://github.com/checklist/NestedFragmentsRecycler
謝謝！
產生內部'onCreateViewHolder'新的ID，而不是'onBindViewHolder'：你只需要儘可能多的ID作爲持有多/你有 – pskink
已經嘗試過，並且在任何滾動之前得到相同的異常 – checklist
，該命令的輸出是什麼：'adb shell dumpsys activity top'？ – pskink