Android自定义支持多层嵌套RadioButton的RadioGroup

Android原生自带的RadioGroup不支持嵌套RadioButton(从源码可看出仅仅是判断子控件是不是RadioButton),参考RadioGroup自定义一个支持嵌套CompoundButton的控件XRadioGroup。

自定义XRadioGroup

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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
public class XRadioGroup extends LinearLayout {
// holds the checked id; the selection is empty by default
private int mCheckedId = -1;
// tracks children radio buttons checked state
private CompoundButton.OnCheckedChangeListener mChildOnCheckedChangeListener;
// when true, mOnCheckedChangeListener discards events
private boolean mProtectFromCheckedChange = false;
private OnCheckedChangeListener mOnCheckedChangeListener;
private PassThroughHierarchyChangeListener mPassThroughListener;

public XRadioGroup(Context context) {
super(context);
init();
}

public XRadioGroup(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

public XRadioGroup(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public XRadioGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
init();
}

private void init() {
mChildOnCheckedChangeListener = new CheckedStateTracker();
mPassThroughListener = new PassThroughHierarchyChangeListener();
super.setOnHierarchyChangeListener(mPassThroughListener);
}

/**
* {@inheritDoc}
*/
@Override
public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) {
// the user listener is delegated to our pass-through listener
mPassThroughListener.mOnHierarchyChangeListener = listener;
}

/**
* {@inheritDoc}
*/
@Override
protected void onFinishInflate() {
super.onFinishInflate();

// checks the appropriate radio button as requested in the XML file
if (mCheckedId != -1) {
mProtectFromCheckedChange = true;
setCheckedStateForView(mCheckedId, true);
mProtectFromCheckedChange = false;
setCheckedId(mCheckedId);
}
}

private void setViewState(View child) {
if (child instanceof RadioButton) {
final RadioButton button = (RadioButton) child;
if (button.isChecked()) {
mProtectFromCheckedChange = true;
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;
setCheckedId(button.getId());
}
} else if (child instanceof ViewGroup) {
ViewGroup view = (ViewGroup) child;
for (int i = 0; i < view.getChildCount(); i++) {
setViewState(view.getChildAt(i));
}
}
}

@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
setViewState(child);
super.addView(child, index, params);
}

/**
* <p>Sets the selection to the radio button whose identifier is passed in
* parameter. Using -1 as the selection identifier clears the selection;
* such an operation is equivalent to invoking {@link #clearCheck()}.</p>
*
* @param id the unique id of the radio button to select in this group
* @see #getCheckedRadioButtonId()
* @see #clearCheck()
*/
public void check(@IdRes int id) {
// don't even bother
if (id != -1 && (id == mCheckedId)) {
return;
}

if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}

if (id != -1) {
setCheckedStateForView(id, true);
}

setCheckedId(id);
}

private void setCheckedId(@IdRes int id) {
mCheckedId = id;
if (mOnCheckedChangeListener != null) {
mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId);
}
}

private void setCheckedStateForView(int viewId, boolean checked) {
View checkedView = findViewById(viewId);
if (checkedView != null && checkedView instanceof RadioButton) {
((RadioButton) checkedView).setChecked(checked);
}
}

/**
* <p>Returns the identifier of the selected radio button in this group.
* Upon empty selection, the returned value is -1.</p>
*
* @return the unique id of the selected radio button in this group
* @attr ref android.R.styleable#RadioGroup_checkedButton
* @see #check(int)
* @see #clearCheck()
*/
@IdRes
public int getCheckedRadioButtonId() {
return mCheckedId;
}

/**
* <p>Clears the selection. When the selection is cleared, no radio button
* in this group is selected and {@link #getCheckedRadioButtonId()} returns
* null.</p>
*
* @see #check(int)
* @see #getCheckedRadioButtonId()
*/
public void clearCheck() {
check(-1);
}

/**
* <p>Register a callback to be invoked when the checked radio button
* changes in this group.</p>
*
* @param listener the callback to call on checked state change
*/
public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
mOnCheckedChangeListener = listener;
}

/**
* {@inheritDoc}
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}

/**
* {@inheritDoc}
*/
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}

@Override
protected LinearLayout.LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}

@Override
public CharSequence getAccessibilityClassName() {
return XRadioGroup.class.getName();
}

/**
* <p>This set of layout parameters defaults the width and the height of
* the children to {@link #WRAP_CONTENT} when they are not specified in the
* XML file. Otherwise, this class ussed the value read from the XML file.</p>
* <p/>
* <p>See
* {@link LinearLayout Attributes}
* for a list of all child view attributes that this class supports.</p>
*/
public static class LayoutParams extends LinearLayout.LayoutParams {
/**
* {@inheritDoc}
*/
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
}

/**
* {@inheritDoc}
*/
public LayoutParams(int w, int h) {
super(w, h);
}

/**
* {@inheritDoc}
*/
public LayoutParams(int w, int h, float initWeight) {
super(w, h, initWeight);
}

/**
* {@inheritDoc}
*/
public LayoutParams(ViewGroup.LayoutParams p) {
super(p);
}

/**
* {@inheritDoc}
*/
public LayoutParams(MarginLayoutParams source) {
super(source);
}

/**
* <p>Fixes the child's width to
* {@link ViewGroup.LayoutParams#WRAP_CONTENT} and the child's
* height to {@link ViewGroup.LayoutParams#WRAP_CONTENT}
* when not specified in the XML file.</p>
*
* @param a the styled attributes set
* @param widthAttr the width attribute to fetch
* @param heightAttr the height attribute to fetch
*/
@Override
protected void setBaseAttributes(TypedArray a,
int widthAttr, int heightAttr) {

if (a.hasValue(widthAttr)) {
width = a.getLayoutDimension(widthAttr, "layout_width");
} else {
width = WRAP_CONTENT;
}

if (a.hasValue(heightAttr)) {
height = a.getLayoutDimension(heightAttr, "layout_height");
} else {
height = WRAP_CONTENT;
}
}
}

/**
* <p>Interface definition for a callback to be invoked when the checked
* radio button changed in this group.</p>
*/
public interface OnCheckedChangeListener {
/**
* <p>Called when the checked radio button has changed. When the
* selection is cleared, checkedId is -1.</p>
*
* @param group the group in which the checked radio button has changed
* @param checkedId the unique identifier of the newly checked radio button
*/
public void onCheckedChanged(XRadioGroup group, @IdRes int checkedId);
}

private class CheckedStateTracker implements CompoundButton.OnCheckedChangeListener {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// prevents from infinite recursion
if (mProtectFromCheckedChange) {
return;
}

mProtectFromCheckedChange = true;
if (mCheckedId != -1) {
setCheckedStateForView(mCheckedId, false);
}
mProtectFromCheckedChange = false;

int id = buttonView.getId();
setCheckedId(id);
}
}

/**
* <p>A pass-through listener acts upon the events and dispatches them
* to another listener. This allows the table layout to set its own internal
* hierarchy change listener without preventing the user to setup his.</p>
*/
private class PassThroughHierarchyChangeListener implements
OnHierarchyChangeListener {
private OnHierarchyChangeListener mOnHierarchyChangeListener;

/**
* {@inheritDoc}
*/
public void onChildViewAdded(View parent, View child) {
setListener(child);

if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewAdded(parent, child);
}
}

/**
* {@inheritDoc}
*/
public void onChildViewRemoved(View parent, View child) {
removeListener(child);

if (mOnHierarchyChangeListener != null) {
mOnHierarchyChangeListener.onChildViewRemoved(parent, child);
}
}
}

/**
* 设置监听
*
* @param child
*/
private void setListener(View child) {
if (child instanceof RadioButton) {
int id = child.getId();
// generates an id if it's missing
if (id == View.NO_ID) {
id = child.hashCode();
child.setId(id);
}
((RadioButton) child).setOnCheckedChangeListener(
mChildOnCheckedChangeListener);
} else if (child instanceof ViewGroup) {
ViewGroup view = (ViewGroup) child;
for (int i = 0; i < view.getChildCount(); i++) {
setListener(view.getChildAt(i));
}
}
}

/**
* 移除监听
*
* @param child
*/
private void removeListener(View child) {
if (child instanceof RadioButton) {
((RadioButton) child).setOnCheckedChangeListener(null);
} else if (child instanceof ViewGroup) {
ViewGroup view = (ViewGroup) child;
for (int i = 0; i < view.getChildCount(); i++) {
removeListener(view.getChildAt(i));
}
}
}
}

引用XRadioGroup

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
xRadioGroup.setOnCheckedChangeListener(new XRadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(XRadioGroup group, int checkedId) {
switch (checkedId) {
case R.id.rb_no_check:

break;
case R.id.rb_pass:

break;
case R.id.rb_no_pass:

break;
}
}
});
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
<me.yezhou.lib.ui_widget.layout.XRadioGroup
android:id="@+id/x_radio_group"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="@id/iv_photo"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:orientation="horizontal"
>
<android.support.constraint.ConstraintLayout
android:id="@+id/layout_no_check"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
>
<RadioButton
android:id="@+id/rb_no_check"
android:layout_width="25dp"
android:layout_height="25dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="20dp"
android:button="@null"
android:background="@drawable/bg_checkbox"
android:checked="true"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintLeft_toRightOf="@id/rb_no_check"
app:layout_constraintTop_toTopOf="@id/rb_no_check"
app:layout_constraintBottom_toBottomOf="@id/rb_no_check"
android:layout_marginLeft="5dp"
android:text="未选择"
/>
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/layout_pass"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
>
<RadioButton
android:id="@+id/rb_pass"
android:layout_width="25dp"
android:layout_height="25dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="20dp"
android:button="@null"
android:background="@drawable/bg_checkbox"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintLeft_toRightOf="@id/rb_pass"
app:layout_constraintTop_toTopOf="@id/rb_pass"
app:layout_constraintBottom_toBottomOf="@id/rb_pass"
android:layout_marginLeft="5dp"
android:text="通过"
/>
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/layout_no_pass"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
>
<RadioButton
android:id="@+id/rb_no_pass"
android:layout_width="25dp"
android:layout_height="25dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="20dp"
android:button="@null"
android:background="@drawable/bg_checkbox"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintLeft_toRightOf="@id/rb_no_pass"
app:layout_constraintTop_toTopOf="@id/rb_no_pass"
app:layout_constraintBottom_toBottomOf="@id/rb_no_pass"
android:layout_marginLeft="5dp"
android:text="未选择"
/>
</android.support.constraint.ConstraintLayout>
</me.yezhou.lib.ui_widget.layout.XRadioGroup>

Powered by AppBlog.CN     浙ICP备14037229号

Copyright © 2012 - 2020 APP开发技术博客 All Rights Reserved.

访客数 : | 访问量 :