DialogCompat.java
/*
* Copyright (C) 2018 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.core.app;
import android.app.Dialog;
import android.os.Build;
import android.view.View;
import androidx.annotation.NonNull;
/**
* Helper for accessing features in {@link android.app.Dialog} in a backwards compatible
* fashion.
*/
public class DialogCompat {
private DialogCompat() {
}
/**
* Finds the first descendant view with the given ID or throws an IllegalArgumentException if
* the ID is invalid (< 0), there is no matching view in the hierarchy, or the dialog has not
* yet been fully created (for example, via {@link android.app.Dialog#show()} or
* {@link android.app.Dialog#create()}).
* <p>
* <strong>Note:</strong> In most cases -- depending on compiler support --
* the resulting view is automatically cast to the target class type. If
* the target class type is unconstrained, an explicit cast may be
* necessary.
*
* @param dialog the Dialog to search the View in
* @param id the ID to search for
* @return a view with given ID
* @see View#requireViewById(int)
* @see Dialog#requireViewById(int)
* @see Dialog#findViewById(int)
*/
@NonNull
public static View requireViewById(@NonNull Dialog dialog, int id) {
if (Build.VERSION.SDK_INT >= 28) {
return dialog.requireViewById(id);
} else {
View view = dialog.findViewById(id);
if (view == null) {
throw new
IllegalArgumentException("ID does not reference a View inside this Dialog");
}
return view;
}
}
}