1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
* Copyright (C) 2006 The Android Open Source Project
*
* 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 android.text.method;
import android.view.KeyEvent;
import android.view.View;
import android.text.Editable;
import android.text.InputFilter;
import android.text.Selection;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
/**
* For numeric text entry
* <p></p>
* As for all implementations of {@link KeyListener}, this class is only concerned
* with hardware keyboards. Software input methods have no obligation to trigger
* the methods in this class.
*/
public abstract class NumberKeyListener extends BaseKeyListener
implements InputFilter
{
/**
* You can say which characters you can accept.
*/
protected abstract char[] getAcceptedChars();
protected int lookup(KeyEvent event, Spannable content) {
return event.getMatch(getAcceptedChars(), getMetaState(content, event));
}
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
char[] accept = getAcceptedChars();
boolean filter = false;
int i;
for (i = start; i < end; i++) {
if (!ok(accept, source.charAt(i))) {
break;
}
}
if (i == end) {
// It was all OK.
return null;
}
if (end - start == 1) {
// It was not OK, and there is only one char, so nothing remains.
return "";
}
SpannableStringBuilder filtered =
new SpannableStringBuilder(source, start, end);
i -= start;
end -= start;
int len = end - start;
// Only count down to i because the chars before that were all OK.
for (int j = end - 1; j >= i; j--) {
if (!ok(accept, source.charAt(j))) {
filtered.delete(j, j + 1);
}
}
return filtered;
}
protected static boolean ok(char[] accept, char c) {
for (int i = accept.length - 1; i >= 0; i--) {
if (accept[i] == c) {
return true;
}
}
return false;
}
@Override
public boolean onKeyDown(View view, Editable content,
int keyCode, KeyEvent event) {
int selStart, selEnd;
{
int a = Selection.getSelectionStart(content);
int b = Selection.getSelectionEnd(content);
selStart = Math.min(a, b);
selEnd = Math.max(a, b);
}
if (selStart < 0 || selEnd < 0) {
selStart = selEnd = 0;
Selection.setSelection(content, 0);
}
int i = event != null ? lookup(event, content) : 0;
int repeatCount = event != null ? event.getRepeatCount() : 0;
if (repeatCount == 0) {
if (i != 0) {
if (selStart != selEnd) {
Selection.setSelection(content, selEnd);
}
content.replace(selStart, selEnd, String.valueOf((char) i));
adjustMetaAfterKeypress(content);
return true;
}
} else if (i == '0' && repeatCount == 1) {
// Pretty hackish, it replaces the 0 with the +
if (selStart == selEnd && selEnd > 0 &&
content.charAt(selStart - 1) == '0') {
content.replace(selStart - 1, selEnd, String.valueOf('+'));
adjustMetaAfterKeypress(content);
return true;
}
}
adjustMetaAfterKeypress(content);
return super.onKeyDown(view, content, keyCode, event);
}
}
|