package com.devspark.robototextview.inflater;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.TypedArray;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.util.ArrayMap;
import android.support.v4.view.ViewCompat;
import android.support.v7.view.ContextThemeWrapper;
import android.support.v7.widget.TintContextWrapper;
import android.util.AttributeSet;
import android.util.Log;
import android.view.InflateException;
import android.view.View;
import com.devspark.robototextview.R;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
@SuppressWarnings("RestrictedApi")
final class RobotoCompatInflater {
private static final Class<?>[] sConstructorSignature = new Class[]{Context.class, AttributeSet.class};
private static final int[] sOnClickAttrs = new int[]{android.R.attr.onClick};
private static final String[] sClassPrefixList = {"android.widget.", "android.view.", "android.webkit."};
private static final String LOG_TAG = "RobotoCompatInflater";
private static final Map<String, Constructor<? extends View>> sConstructorMap = new ArrayMap<>();
private final Object[] mConstructorArgs = new Object[2];
final View createView(View parent, final String name, @NonNull Context context,
@NonNull AttributeSet attrs, boolean inheritContext,
boolean readAppTheme, boolean wrapContext) {
if (inheritContext && parent != null) {
context = parent.getContext();
}
if (readAppTheme) {
context = themifyContext(context, attrs, true);
}
if (wrapContext) {
context = TintContextWrapper.wrap(context);
}
View view = createViewFromTag(context, name, attrs);
if (view != null) {
checkOnClickListener(view, attrs);
}
return view;
}
@SuppressWarnings("ForLoopReplaceableByForEach")
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('.')) {
for (int i = 0; i < sClassPrefixList.length; i++) {
final View view = createView(context, name, sClassPrefixList[i]);
if (view != null) {
return view;
}
}
return null;
} else {
return createView(context, name, null);
}
} catch (Exception e) {
return null;
} finally {
mConstructorArgs[0] = null;
mConstructorArgs[1] = null;
}
}
/**
* android:onClick doesn't handle views with a ContextWrapper context. This method
* backports new framework functionality to traverse the Context wrappers to find a
* suitable target.
*/
private void checkOnClickListener(View view, AttributeSet attrs) {
final Context context = view.getContext();
if (!(context instanceof ContextWrapper) ||
(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1 && !ViewCompat.hasOnClickListeners(view))) {
// Skip our compat functionality if: the Context isn't a ContextWrapper, or
// the view doesn't have an OnClickListener (we can only rely on this on API 15+ so
// always use our compat code on older devices)
return;
}
final TypedArray a = context.obtainStyledAttributes(attrs, sOnClickAttrs);
final String handlerName = a.getString(0);
if (handlerName != null) {
view.setOnClickListener(new DeclaredOnClickListener(view, handlerName));
}
a.recycle();
}
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.
*/
@SuppressLint("PrivateResource")
private static Context themifyContext(Context context, AttributeSet attrs, boolean useAppTheme) {
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.View, 0, 0);
int 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;
}
/**
* An implementation of OnClickListener that attempts to lazily load a
* named click handling method from a parent or ancestor context.
*/
private static class DeclaredOnClickListener implements View.OnClickListener {
private final View mHostView;
private final String mMethodName;
private Method mResolvedMethod;
private Context mResolvedContext;
DeclaredOnClickListener(@NonNull View hostView, @NonNull String methodName) {
mHostView = hostView;
mMethodName = methodName;
}
@Override
public void onClick(@NonNull View v) {
if (mResolvedMethod == null) {
resolveMethod(mHostView.getContext(), mMethodName);
}
try {
mResolvedMethod.invoke(mResolvedContext, v);
} catch (IllegalAccessException e) {
throw new IllegalStateException(
"Could not execute non-public method for android:onClick", e);
} catch (InvocationTargetException e) {
throw new IllegalStateException(
"Could not execute method for android:onClick", e);
}
}
private void resolveMethod(@Nullable Context context, @NonNull String name) {
while (context != null) {
try {
if (!context.isRestricted()) {
final Method method = context.getClass().getMethod(name, View.class);
if (method != null) {
mResolvedMethod = method;
mResolvedContext = context;
return;
}
}
} catch (NoSuchMethodException e) {
// Failed to find method, keep searching up the hierarchy.
}
if (context instanceof ContextWrapper) {
context = ((ContextWrapper) context).getBaseContext();
} else {
// Can't search up the hierarchy, null out and fail.
context = null;
}
}
final int id = mHostView.getId();
final String idText = id == View.NO_ID ? "" : " with id '"
+ mHostView.getContext().getResources().getResourceEntryName(id) + "'";
throw new IllegalStateException("Could not find method " + name
+ "(View) in a parent or ancestor Context for android:onClick "
+ "attribute defined on view " + mHostView.getClass() + idText);
}
}
}
