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 com.android.settingslib.display.DisplayDensityUtils;
20 
21 import android.content.Context;
22 import android.support.v4.content.res.TypedArrayUtils;
23 import android.support.v7.preference.PreferenceGroup;
24 import android.text.TextUtils;
25 import android.util.AttributeSet;
26 
27 /**
28  * Preference for changing the density of the display on which the preference
29  * is visible.
30  */
31 public class ScreenZoomPreference extends PreferenceGroup {
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.preferenceScreenStyle,
35                 android.R.attr.preferenceScreenStyle));
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     @Override
isOnSameScreenAsChildren()54     protected boolean isOnSameScreenAsChildren() {
55         return false;
56     }
57 }
58