/*
* Copyright (C) 2014 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 android.support.v7.internal.app;
import android.content.Context;
import android.content.res.TypedArray;
import android.support.annotation.NonNull;
import android.support.v4.util.ArrayMap;
import android.support.v7.appcompat.R;
import android.support.v7.internal.view.ContextThemeWrapper;
import android.support.v7.widget.AppCompatAutoCompleteTextView;
import android.support.v7.widget.AppCompatButton;
import android.support.v7.widget.AppCompatCheckBox;
import android.support.v7.widget.AppCompatCheckedTextView;
import android.support.v7.widget.AppCompatEditText;
import android.support.v7.widget.AppCompatMultiAutoCompleteTextView;
import android.support.v7.widget.AppCompatRadioButton;
import android.support.v7.widget.AppCompatRatingBar;
import android.support.v7.widget.AppCompatSpinner;
import android.support.v7.internal.widget.ViewUtils;
import android.support.v7.widget.AppCompatTextView;
import android.util.AttributeSet;
import android.util.Log;
import android.view.InflateException;
import android.view.View;
import java.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.Map;
/**
* This class is responsible for manually inflating our tinted widgets which are used on devices
* running {@link android.os.Build.VERSION_CODES#KITKAT KITKAT} or below. As such, this class
* should only be used when running on those devices.
* <p>This class two main responsibilities: the first is to 'inject' our tinted views in place of
* the framework versions in layout inflation; the second is backport the {@code android:theme}
* functionality for any inflated widgets. This include theme inheritance from it's parent.
*
* @hide
*/
public class AppCompatViewInflater {
static final Class<?>[] sConstructorSignature = new Class[]{
Context.class, AttributeSet.class};
private static final String LOG_TAG = "AppCompatViewInflater";
private static final Map<String, Constructor<? extends View>> sConstructorMap
= new ArrayMap<>();
private final Object[] mConstructorArgs = new Object[2];
public final View createView(View parent, final String name, @NonNull Context context,
@NonNull AttributeSet attrs, boolean inheritContext,
boolean readAndroidTheme, boolean readAppTheme) {
final Context originalContext = context;
// We can emulate Lollipop's android:theme attribute propagating down the view hierarchy
// by using the parent's context
if (inheritContext && parent != null) {
context = parent.getContext();
}
if (readAndroidTheme || readAppTheme) {
// We then apply the theme on the context, if specified
context = themifyContext(context, attrs, readAndroidTheme, readAppTheme);
}
// We need to 'inject' our tint aware Views in place of the standard framework versions
switch (name) {
case "EditText":
return new AppCompatEditText(context, attrs);
case "Spinner":
return new AppCompatSpinner(context, attrs);
case "CheckBox":
return new AppCompatCheckBox(context, attrs);
case "RadioButton":
return new AppCompatRadioButton(context, attrs);
case "CheckedTextView":
return new AppCompatCheckedTextView(context, attrs);
case "AutoCompleteTextView":
return new AppCompatAutoCompleteTextView(context, attrs);
case "MultiAutoCompleteTextView":
return new AppCompatMultiAutoCompleteTextView(context, attrs);
case "RatingBar":
return new AppCompatRatingBar(context, attrs);
case "Button":
return new AppCompatButton(context, attrs);
case "TextView":
return new AppCompatTextView(context, attrs);
}
if (originalContext != context) {
// If the original context does not equal our themed context, then we need to manually
// inflate it using the name so that android:theme takes effect.
return createViewFromTag(context, name, attrs);
}
return null;
}
private View createViewFromTag(Context context, String name, AttributeSet attrs) {
if (name.equals("view")) {
name = attrs.getAttributeValue(null, "class");
}
try {
mConstructorArgs[0] = context;
mConstructorArgs[1] = attrs;
if (-1 == name.indexOf('.')) {
// try the android.widget prefix first...
return createView(context, name, "android.widget.");
} else {
return createView(context, name, null);
}
} catch (Exception e) {
// We do not want to catch these, lets return null and let the actual LayoutInflater
// try
return null;
} finally {
// Don't retain references on context.
mConstructorArgs[0] = null;
mConstructorArgs[1] = null;
}
}
private View createView(Context context, String name, String prefix)
throws ClassNotFoundException, InflateException {
Constructor<? extends View> constructor = sConstructorMap.get(name);
try {
if (constructor == null) {
// Class not found in the cache, see if it's real, and try to add it
Class<? extends View> clazz = context.getClassLoader().loadClass(
prefix != null ? (prefix + name) : name).asSubclass(View.class);
constructor = clazz.getConstructor(sConstructorSignature);
sConstructorMap.put(name, constructor);
}
constructor.setAccessible(true);
return constructor.newInstance(mConstructorArgs);
} catch (Exception e) {
// We do not want to catch these, lets return null and let the actual LayoutInflater
// try
return null;
}
}
/**
* Allows us to emulate the {@code android:theme} attribute for devices before L.
*/
private static Context themifyContext(Context context, AttributeSet attrs,
boolean useAndroidTheme, boolean useAppTheme) {
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.View, 0, 0);
int themeId = 0;
if (useAndroidTheme) {
// First try reading android:theme if enabled
themeId = a.getResourceId(R.styleable.View_android_theme, 0);
}
if (useAppTheme && themeId == 0) {
// ...if that didn't work, try reading app:theme (for legacy reasons) if enabled
themeId = a.getResourceId(R.styleable.View_theme, 0);
if (themeId != 0) {
Log.i(LOG_TAG, "app:theme is now deprecated. "
+ "Please move to using android:theme instead.");
}
}
a.recycle();
if (themeId != 0 && (!(context instanceof ContextThemeWrapper)
|| ((ContextThemeWrapper) context).getThemeResId() != themeId)) {
// If the context isn't a ContextThemeWrapper, or it is but does not have
// the same theme as we need, wrap it in a new wrapper
context = new ContextThemeWrapper(context, themeId);
}
return context;
}
}