a53b3983bf
PiperOrigin-RevId: 210155157 Change-Id: I707512aab6ac57aaebb93275669ae16b92b0e66d
269 lines
10 KiB
Java
269 lines
10 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.setupwizardlib;
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import android.annotation.TargetApi;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.os.Build.VERSION_CODES;
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import androidx.annotation.Keep;
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import androidx.annotation.LayoutRes;
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import androidx.annotation.StyleRes;
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import android.util.AttributeSet;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewTreeObserver;
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import android.widget.FrameLayout;
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import com.android.setupwizardlib.template.Mixin;
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import com.android.setupwizardlib.util.FallbackThemeWrapper;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* A generic template class that inflates a template, provided in the constructor or in {@code
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* android:layout} through XML, and adds its children to a "container" in the template. When
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* inflating this layout from XML, the {@code android:layout} and {@code suwContainer} attributes
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* are required.
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*/
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public class TemplateLayout extends FrameLayout {
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/**
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* The container of the actual content. This will be a view in the template, which child views
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* will be added to when {@link #addView(View)} is called.
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*/
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private ViewGroup container;
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private final Map<Class<? extends Mixin>, Mixin> mixins = new HashMap<>();
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public TemplateLayout(Context context, int template, int containerId) {
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super(context);
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init(template, containerId, null, R.attr.suwLayoutTheme);
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}
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public TemplateLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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init(0, 0, attrs, R.attr.suwLayoutTheme);
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}
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@TargetApi(VERSION_CODES.HONEYCOMB)
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public TemplateLayout(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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init(0, 0, attrs, defStyleAttr);
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}
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// All the constructors delegate to this init method. The 3-argument constructor is not
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// available in LinearLayout before v11, so call super with the exact same arguments.
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private void init(int template, int containerId, AttributeSet attrs, int defStyleAttr) {
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final TypedArray a =
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getContext().obtainStyledAttributes(attrs, R.styleable.SuwTemplateLayout, defStyleAttr, 0);
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if (template == 0) {
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template = a.getResourceId(R.styleable.SuwTemplateLayout_android_layout, 0);
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}
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if (containerId == 0) {
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containerId = a.getResourceId(R.styleable.SuwTemplateLayout_suwContainer, 0);
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}
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inflateTemplate(template, containerId);
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a.recycle();
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}
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/**
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* Registers a mixin with a given class. This method should be called in the constructor.
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*
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* @param cls The class to register the mixin. In most cases, {@code cls} is the same as {@code
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* mixin.getClass()}, but {@code cls} can also be a super class of that. In the latter case
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* the mixin must be retrieved using {@code cls} in {@link #getMixin(Class)}, not the
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* subclass.
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* @param mixin The mixin to be registered.
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* @param <M> The class of the mixin to register. This is the same as {@code cls}
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*/
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protected <M extends Mixin> void registerMixin(Class<M> cls, M mixin) {
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mixins.put(cls, mixin);
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}
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/**
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* Same as {@link android.view.View#findViewById(int)}, but may include views that are managed by
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* this view but not currently added to the view hierarchy. e.g. recycler view or list view
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* headers that are not currently shown.
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*/
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// Returning generic type is the common pattern used for findViewBy* methods
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@SuppressWarnings("TypeParameterUnusedInFormals")
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public <T extends View> T findManagedViewById(int id) {
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return findViewById(id);
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}
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/**
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* Get a {@link Mixin} from this template registered earlier in {@link #registerMixin(Class,
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* Mixin)}.
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*
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* @param cls The class marker of Mixin being requested. The actual Mixin returned may be a
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* subclass of this marker. Note that this must be the same class as registered in {@link
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* #registerMixin(Class, Mixin)}, which is not necessarily the same as the concrete class of
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* the instance returned by this method.
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* @param <M> The type of the class marker.
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* @return The mixin marked by {@code cls}, or null if the template does not have a matching
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* mixin.
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*/
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@SuppressWarnings("unchecked")
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public <M extends Mixin> M getMixin(Class<M> cls) {
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return (M) mixins.get(cls);
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}
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@Override
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public void addView(View child, int index, ViewGroup.LayoutParams params) {
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container.addView(child, index, params);
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}
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private void addViewInternal(View child) {
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super.addView(child, -1, generateDefaultLayoutParams());
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}
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private void inflateTemplate(int templateResource, int containerId) {
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final LayoutInflater inflater = LayoutInflater.from(getContext());
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final View templateRoot = onInflateTemplate(inflater, templateResource);
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addViewInternal(templateRoot);
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container = findContainer(containerId);
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if (container == null) {
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throw new IllegalArgumentException("Container cannot be null in TemplateLayout");
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}
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onTemplateInflated();
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}
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/**
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* Inflate the template using the given inflater and theme. The fallback theme will be applied to
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* the theme without overriding the values already defined in the theme, but simply providing
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* default values for values which have not been defined. This allows templates to add additional
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* required theme attributes without breaking existing clients.
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*
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* <p>In general, clients should still set the activity theme to the corresponding theme in setup
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* wizard lib, so that the content area gets the correct styles as well.
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*
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* @param inflater A LayoutInflater to inflate the template.
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* @param fallbackTheme A fallback theme to apply to the template. If the values defined in the
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* fallback theme is already defined in the original theme, the value in the original theme
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* takes precedence.
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* @param template The layout template to be inflated.
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* @return Root of the inflated layout.
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* @see FallbackThemeWrapper
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*/
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protected final View inflateTemplate(
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LayoutInflater inflater, @StyleRes int fallbackTheme, @LayoutRes int template) {
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if (template == 0) {
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throw new IllegalArgumentException("android:layout not specified for TemplateLayout");
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}
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if (fallbackTheme != 0) {
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inflater =
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LayoutInflater.from(new FallbackThemeWrapper(inflater.getContext(), fallbackTheme));
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}
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return inflater.inflate(template, this, false);
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}
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/**
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* This method inflates the template. Subclasses can override this method to customize the
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* template inflation, or change to a different default template. The root of the inflated layout
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* should be returned, and not added to the view hierarchy.
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*
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* @param inflater A LayoutInflater to inflate the template.
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* @param template The resource ID of the template to be inflated, or 0 if no template is
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* specified.
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* @return Root of the inflated layout.
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*/
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protected View onInflateTemplate(LayoutInflater inflater, @LayoutRes int template) {
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return inflateTemplate(inflater, 0, template);
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}
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protected ViewGroup findContainer(int containerId) {
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if (containerId == 0) {
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// Maintain compatibility with the deprecated way of specifying container ID.
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containerId = getContainerId();
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}
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return (ViewGroup) findViewById(containerId);
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}
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/**
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* This is called after the template has been inflated and added to the view hierarchy. Subclasses
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* can implement this method to modify the template as necessary, such as caching views retrieved
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* from findViewById, or other view operations that need to be done in code. You can think of this
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* as {@link View#onFinishInflate()} but for inflation of the template instead of for child views.
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*/
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protected void onTemplateInflated() {}
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/**
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* @return ID of the default container for this layout. This will be used to find the container
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* ViewGroup, which all children views of this layout will be placed in.
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* @deprecated Override {@link #findContainer(int)} instead.
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*/
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@Deprecated
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protected int getContainerId() {
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return 0;
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}
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/* Animator support */
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private float xFraction;
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private ViewTreeObserver.OnPreDrawListener preDrawListener;
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/**
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* Set the X translation as a fraction of the width of this view. Make sure this method is not
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* stripped out by proguard when using this with {@link android.animation.ObjectAnimator}. You may
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* need to add <code>
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* -keep @androidx.annotation.Keep class *
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* </code> to your proguard configuration if you are seeing mysterious {@link NoSuchMethodError}
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* at runtime.
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*/
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@Keep
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@TargetApi(VERSION_CODES.HONEYCOMB)
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public void setXFraction(float fraction) {
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xFraction = fraction;
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final int width = getWidth();
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if (width != 0) {
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setTranslationX(width * fraction);
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} else {
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// If we haven't done a layout pass yet, wait for one and then set the fraction before
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// the draw occurs using an OnPreDrawListener. Don't call translationX until we know
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// getWidth() has a reliable, non-zero value or else we will see the fragment flicker on
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// screen.
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if (preDrawListener == null) {
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preDrawListener =
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new ViewTreeObserver.OnPreDrawListener() {
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@Override
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public boolean onPreDraw() {
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getViewTreeObserver().removeOnPreDrawListener(preDrawListener);
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setXFraction(xFraction);
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return true;
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}
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};
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getViewTreeObserver().addOnPreDrawListener(preDrawListener);
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}
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}
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}
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/**
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* Return the X translation as a fraction of the width, as previously set in {@link
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* #setXFraction(float)}.
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*
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* @see #setXFraction(float)
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*/
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@Keep
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@TargetApi(VERSION_CODES.HONEYCOMB)
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public float getXFraction() {
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return xFraction;
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}
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}
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