Skip to content

Most visited

Recently visited

navigation
ActivitySceneTransitionBasic / src / com.example.android.activityscenetransitionbasic /

SquareFrameLayout.java

1
/*
2
 * Copyright (C) 2014 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.example.android.activityscenetransitionbasic;
18
 
19
import android.content.Context;
20
import android.util.AttributeSet;
21
import android.widget.FrameLayout;
22
 
23
/**
24
 * {@link android.widget.FrameLayout} which forces itself to be laid out as square.
25
 */
26
public class SquareFrameLayout extends FrameLayout {
27
 
28
    public SquareFrameLayout(Context context) {
29
        super(context);
30
    }
31
 
32
    public SquareFrameLayout(Context context, AttributeSet attrs) {
33
        super(context, attrs);
34
    }
35
 
36
    public SquareFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
37
        super(context, attrs, defStyleAttr);
38
    }
39
 
40
    public SquareFrameLayout(Context context, AttributeSet attrs,
41
            int defStyleAttr, int defStyleRes) {
42
        super(context, attrs, defStyleAttr, defStyleRes);
43
    }
44
 
45
    @Override
46
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
47
        final int widthSize = MeasureSpec.getSize(widthMeasureSpec);
48
        final int heightSize = MeasureSpec.getSize(heightMeasureSpec);
49
 
50
        if (widthSize == 0 && heightSize == 0) {
51
            // If there are no constraints on size, let FrameLayout measure
52
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
53
 
54
            // Now use the smallest of the measured dimensions for both dimensions
55
            final int minSize = Math.min(getMeasuredWidth(), getMeasuredHeight());
56
            setMeasuredDimension(minSize, minSize);
57
            return;
58
        }
59
 
60
        final int size;
61
        if (widthSize == 0 || heightSize == 0) {
62
            // If one of the dimensions has no restriction on size, set both dimensions to be the
63
            // on that does
64
            size = Math.max(widthSize, heightSize);
65
        } else {
66
            // Both dimensions have restrictions on size, set both dimensions to be the
67
            // smallest of the two
68
            size = Math.min(widthSize, heightSize);
69
        }
70
 
71
        final int newMeasureSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.EXACTLY);
72
        super.onMeasure(newMeasureSpec, newMeasureSpec);
73
    }
74
}
This site uses cookies to store your preferences for site-specific language and display options.

Get the latest Android developer news and tips that will help you find success on Google Play.

* Required Fields

Hooray!

Browse this site in ?

You requested a page in , but your language preference for this site is .

Would you like to change your language preference and browse this site in ? If you want to change your language preference later, use the language menu at the bottom of each page.

This class requires API level or higher

This doc is hidden because your selected API level for the documentation is . You can change the documentation API level with the selector above the left navigation.

For more information about specifying the API level your app requires, read Supporting Different Platform Versions.

Take a short survey?
Help us improve the Android developer experience.
(Sep 2017 survey)