Java tutorial
/* * Copyright (c) 2015-2017 Uli Bubenheimer. * * 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 org.bubenheimer.android.preference; import android.content.Context; import android.content.res.TypedArray; import android.support.v4.util.Pair; import android.support.v7.preference.PreferenceDialogFragmentCompat; import android.util.AttributeSet; import org.bubenheimer.android.util.R; public final class ConstrainedEditTextPreference extends SummaryEditTextPreference { final int minLength; final int maxLength; @SuppressWarnings("WeakerAccess") protected ConstrainedEditTextPreference(final Context context, final AttributeSet attrs, final Pair<Integer, Integer> defaults) { super(context, attrs); final TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ConstrainedEditTextPreference, 0, 0); try { this.minLength = a.getInteger(R.styleable.ConstrainedEditTextPreference_minLen, defaults.first); this.maxLength = a.getInteger(R.styleable.ConstrainedEditTextPreference_maxLen, defaults.second); } finally { a.recycle(); } } @SuppressWarnings("unused") public ConstrainedEditTextPreference(final Context context, final AttributeSet attrs) { this(context, attrs, new Pair<>(0, Integer.MAX_VALUE)); } @Override public PreferenceDialogFragmentCompat newDialog() { return ConstrainedEditTextPreferenceDialogFragment.newInstance(getKey()); } }