| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package androidx.fragment.app; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| import androidx.fragment.R; |
| |
| class FragmentLayoutInflaterFactory implements LayoutInflater.Factory2 { |
| private static final String TAG = FragmentManager.TAG; |
| |
| private final FragmentManager mFragmentManager; |
| |
| FragmentLayoutInflaterFactory(FragmentManager fragmentManager) { |
| mFragmentManager = fragmentManager; |
| } |
| |
| @Nullable |
| @Override |
| public View onCreateView(@NonNull String name, @NonNull Context context, |
| @NonNull AttributeSet attrs) { |
| return onCreateView(null, name, context, attrs); |
| } |
| |
| @Nullable |
| @Override |
| public View onCreateView(@Nullable View parent, @NonNull String name, @NonNull Context context, |
| @NonNull AttributeSet attrs) { |
| if (!"fragment".equals(name)) { |
| return null; |
| } |
| |
| String fname = attrs.getAttributeValue(null, "class"); |
| TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Fragment); |
| if (fname == null) { |
| fname = a.getString(R.styleable.Fragment_android_name); |
| } |
| int id = a.getResourceId(R.styleable.Fragment_android_id, View.NO_ID); |
| String tag = a.getString(R.styleable.Fragment_android_tag); |
| a.recycle(); |
| |
| if (fname == null || !FragmentFactory.isFragmentClass(context.getClassLoader(), fname)) { |
| // Invalid support lib fragment; let the device's framework handle it. |
| // This will allow android.app.Fragments to do the right thing. |
| return null; |
| } |
| |
| int containerId = parent != null ? parent.getId() : 0; |
| if (containerId == View.NO_ID && id == View.NO_ID && tag == null) { |
| throw new IllegalArgumentException(attrs.getPositionDescription() |
| + ": Must specify unique android:id, android:tag, or " |
| + "have a parent with an id for " + fname); |
| } |
| |
| // If we restored from a previous state, we may already have |
| // instantiated this fragment from the state and should use |
| // that instance instead of making a new one. |
| Fragment fragment = id != View.NO_ID ? mFragmentManager.findFragmentById(id) : null; |
| if (fragment == null && tag != null) { |
| fragment = mFragmentManager.findFragmentByTag(tag); |
| } |
| if (fragment == null && containerId != View.NO_ID) { |
| fragment = mFragmentManager.findFragmentById(containerId); |
| } |
| |
| if (FragmentManager.DEBUG) { |
| Log.v(TAG, "onCreateView: id=0x" |
| + Integer.toHexString(id) + " fname=" + fname |
| + " existing=" + fragment); |
| } |
| if (fragment == null) { |
| fragment = mFragmentManager.getFragmentFactory().instantiate( |
| context.getClassLoader(), fname); |
| fragment.mFromLayout = true; |
| fragment.mFragmentId = id != 0 ? id : containerId; |
| fragment.mContainerId = containerId; |
| fragment.mTag = tag; |
| fragment.mInLayout = true; |
| fragment.mFragmentManager = mFragmentManager; |
| fragment.mHost = mFragmentManager.mHost; |
| fragment.onInflate(mFragmentManager.mHost.getContext(), attrs, |
| fragment.mSavedFragmentState); |
| mFragmentManager.addFragment(fragment); |
| mFragmentManager.moveToState(fragment); |
| |
| } else if (fragment.mInLayout) { |
| // A fragment already exists and it is not one we restored from |
| // previous state. |
| throw new IllegalArgumentException(attrs.getPositionDescription() |
| + ": Duplicate id 0x" + Integer.toHexString(id) |
| + ", tag " + tag + ", or parent id 0x" + Integer.toHexString(containerId) |
| + " with another fragment for " + fname); |
| } else { |
| // This fragment was retained from a previous instance; get it |
| // going now. |
| fragment.mInLayout = true; |
| fragment.mHost = mFragmentManager.mHost; |
| // Give the Fragment the attributes to initialize itself. |
| fragment.onInflate(mFragmentManager.mHost.getContext(), attrs, |
| fragment.mSavedFragmentState); |
| } |
| |
| // If we haven't finished entering the CREATED state ourselves yet, |
| // push the inflated child fragment along. This will ensureInflatedFragmentView |
| // at the right phase of the lifecycle so that we will have mView populated |
| // for compliant fragments below. |
| if (mFragmentManager.mCurState < Fragment.CREATED && fragment.mFromLayout) { |
| mFragmentManager.moveToState(fragment, Fragment.CREATED); |
| } else { |
| mFragmentManager.moveToState(fragment); |
| } |
| |
| if (fragment.mView == null) { |
| throw new IllegalStateException("Fragment " + fname |
| + " did not create a view."); |
| } |
| if (id != 0) { |
| fragment.mView.setId(id); |
| } |
| if (fragment.mView.getTag() == null) { |
| fragment.mView.setTag(tag); |
| } |
| return fragment.mView; |
| } |
| } |
