Modal popup window in Android
There is a task to make a pop-up window of a special design. I made a design, created a class for Popup Windows. Now you need this window to be modal, i.e. have a transparent background, behind which the Activity would be visible.
I can't find how to do this.
I tried to create a window with a parent layer, which, being stretched to the full screen, would perform the task of a modal background. the background property is set as a color with transparency. However, as a result, I have the transparent modal window failed. The background color was just lighter and nothing was visible behind it. what should I do?
<GridLayout
android:id="@+id/tracker_control_modal"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/master_blue_dark_transparent"
android:columnCount="1"
android:rowCount="1"
>
<LinearLayout
android:id="@+id/tracker_control_root"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="@color/master_white"
android:layout_column="0"
android:layout_row="0"
android:layout_gravity="center">
<GridLayout
style="@style/Style_TrackerControl_Item"
android:id="@+id/tracker_control_item_preference">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="close"
android:id="@+id/close_button"/>
</GridLayout>
</LinearLayout>
</GridLayout>
2 answers
Use the alpha channel to make the elements transparent:
android:alpha="0.5" // - 50%
android:alpha="1" // - 100% (непрозрачный)
Or programmatically:
textView.getBackground().setAlpha(80);
If you want to change the alpha channel for a particular color, use this hex transparency table:
100% — FF
99% — FC
98% — FA
97% — F7
96% — F5
95% — F2
94% — F0
93% — ED
92% — EB
91% — E8
90% — E6
89% — E3
88% — E0
87% — DE
86% — DB
85% — D9
84% — D6
83% — D4
82% — D1
81% — CF
80% — CC
79% — C9
78% — C7
77% — C4
76% — C2
75% — BF
74% — BD
73% — BA
72% — B8
71% — B5
70% — B3
69% — B0
68% — AD
67% — AB
66% — A8
65% — A6
64% — A3
63% — A1
62% — 9E
61% — 9C
60% — 99
59% — 96
58% — 94
57% — 91
56% — 8F
55% — 8C
54% — 8A
53% — 87
52% — 85
51% — 82
50% — 80
49% — 7D
48% — 7A
47% — 78
46% — 75
45% — 73
44% — 70
43% — 6E
42% — 6B
41% — 69
40% — 66
39% — 63
38% — 61
37% — 5E
36% — 5C
35% — 59
34% — 57
33% — 54
32% — 52
31% — 4F
30% — 4D
29% — 4A
28% — 47
27% — 45
26% — 42
25% — 40
24% — 3D
23% — 3B
22% — 38
21% — 36
20% — 33
19% — 30
18% — 2E
17% — 2B
16% — 29
15% — 26
14% — 24
13% — 21
12% — 1F
11% — 1C
10% — 1A
9% — 17
8% — 14
7% — 12
6% — 0F
5% — 0D
4% — 0A
3% — 08
2% — 05
1% — 03
0% — 00
Example: android:background="#80FFFFFF" / / 50% transparent
Look at the documentation on DialogFragment, this is what you need.
Here is a small tutorial: http://javatechig.com/android/android-dialog-fragment-example