1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.settings.display; 18 19 import android.content.Context; 20 import android.support.v4.content.res.TypedArrayUtils; 21 import android.support.v7.preference.Preference; 22 import android.text.TextUtils; 23 import android.util.AttributeSet; 24 25 import com.android.settingslib.display.DisplayDensityUtils; 26 27 /** 28 * Preference for changing the density of the display on which the preference 29 * is visible. 30 */ 31 public class ScreenZoomPreference extends Preference { ScreenZoomPreference(Context context, AttributeSet attrs)32 public ScreenZoomPreference(Context context, AttributeSet attrs) { 33 super(context, attrs, TypedArrayUtils.getAttr(context, 34 android.support.v7.preference.R.attr.preferenceStyle, 35 android.R.attr.preferenceStyle)); 36 37 if (TextUtils.isEmpty(getFragment())) { 38 setFragment("com.android.settings.display.ScreenZoomSettings"); 39 } 40 41 final DisplayDensityUtils density = new DisplayDensityUtils(context); 42 final int defaultIndex = density.getCurrentIndex(); 43 if (defaultIndex < 0) { 44 setVisible(false); 45 setEnabled(false); 46 } else if (TextUtils.isEmpty(getSummary())) { 47 final String[] entries = density.getEntries(); 48 final int currentIndex = density.getCurrentIndex(); 49 setSummary(entries[currentIndex]); 50 } 51 } 52 } 53