最近在学习撸撸的代码,发现他的轮播写法很独特,但是有bug,就重新修改了一下,现在支持左右点击和圆点自定义。
BannerAdapter:(注意适配器自己看ImageView和onclick的自己项目的写法~)
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
|
package
com.example.p029_banner_lunbo.adapter;
import
android.app.Activity;
import
android.view.View;
import
android.view.ViewGroup;
import
android.widget.ImageView;
import
com.example.p029_banner_lunbo.bannerutils.BannerView;
import
com.example.p029_banner_lunbo.domain.Biaoge_listBean;
import
java.util.List;
public
class
BannerAdapter
extends
BannerView.Adapter {
private
List<Biaoge_listBean> mAdList;
private
Object mReceiver;
public
BannerAdapter(Object receiver, List<Biaoge_listBean> items) {
mReceiver = receiver;
mAdList = items;
}
@Override
public
int
getRealCount() {
return
mAdList.size();
}
@Override
public
Object instantiateItem(
final
ViewGroup container,
int
position) {
int
size = mAdList.size();
if
(size ==
0
) {
return
null
;
}
final
int
pos = position % size;
final
Biaoge_listBean item = mAdList.get(pos);
ViewGroup.LayoutParams p =
new
ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
ImageView iv =
new
ImageView(container.getContext());
iv.setScaleType(ImageView.ScaleType.FIT_XY);
iv.setAdjustViewBounds(
true
);
container.addView(iv, p);
iv.setBackgroundResource(item.getImg_url());
// GlideUtil.display(container.getContext(), iv, item.getPic_url(),
// GlideOptionsFactory.get(GlideOptionsFactory.Type.RADIUS));
iv.setOnClickListener(
new
View.OnClickListener() {
@Override
public
void
onClick(View v) {
// MobEventHelper.onEvent(container.getContext(), "UI2_ec_index_banner");
// MobEventHelper.onEvent(container.getContext(), "UI2_ec_index_banner_" + String.valueOf(pos + 1));
if
(container.getContext()
instanceof
Activity) {
Activity act = (Activity) container.getContext();
//跳转bufen
// HiosHelper.resolveAd(act, mReceiver, item.getUrl());
}
}
});
return
iv;
}
@Override
public
void
destroyItem(ViewGroup container,
int
position, Object object) {
container.removeView((View) object);
}
}
|
DotIndicatorView:(圆点的方法大部分都public了,大家可以DotIndicatorView.自定义~)
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
|
package
com.example.p029_banner_lunbo.bannerutils;
import
android.content.Context;
import
android.graphics.Canvas;
import
android.graphics.Color;
import
android.graphics.Paint;
import
android.util.AttributeSet;
import
android.util.DisplayMetrics;
import
android.util.TypedValue;
import
android.view.View;
/**
* 圆点导航
* @author geek
*
*/
public
class
DotIndicatorView
extends
View {
private
Paint mPaint;
private
int
mPadding;
private
int
mCircleRadius;
private
int
mCurrentColor;
private
int
mNormalColor;
private
int
mCount =
3
;
private
int
mCurrent;
public
DotIndicatorView(Context context) {
super
(context);
initView();
}
public
DotIndicatorView(Context context, AttributeSet attrs) {
this
(context, attrs,
0
);
}
public
DotIndicatorView(Context context, AttributeSet attrs,
int
defStyle) {
super
(context, attrs, defStyle);
initView();
}
private
void
initView() {
DisplayMetrics dm = getResources().getDisplayMetrics();
mPadding = (
int
) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
10
, dm);
mCircleRadius = (
int
) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
4
, dm);
mCurrentColor = Color.WHITE;
mNormalColor = Color.argb(
88
,
91
,
91
,
91
);
mPaint =
new
Paint(Paint.ANTI_ALIAS_FLAG);
}
@Override
protected
void
onMeasure(
int
widthMeasureSpec,
int
heightMeasureSpec) {
int
width = mCircleRadius *
2
* mCount + mPadding * (mCount -
1
);
int
height = mCircleRadius *
2
;
setMeasuredDimension(width, height);
}
@Override
protected
void
onDraw(Canvas canvas) {
for
(
int
i =
0
; i < mCount; i++) {
canvas.save();
canvas.translate((mCircleRadius *
2
+ mPadding) * i,
0
);
if
(i == mCurrent) mPaint.setColor(mCurrentColor);
else
mPaint.setColor(mNormalColor);
canvas.drawCircle(mCircleRadius , mCircleRadius, mCircleRadius, mPaint);
canvas.restore();
}
}
/**
* 创建导航
* @param count 个数
*/
public
void
create(
int
count) {
mCount = count;
requestLayout();
invalidate();
}
/**
* 选中当前
* @param position 选中位置
*/
public
void
current(
int
position) {
mCurrent = position;
invalidate();
}
/**
* 获取当前选中的位置
* @return
*/
public
int
current() {
return
mCurrent;
}
}
|
BannerView:(自定义的View~)
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
|
package
com.example.p029_banner_lunbo.bannerutils;
import
android.content.Context;
import
android.content.res.TypedArray;
import
android.os.Bundle;
import
android.os.Handler;
import
android.os.Message;
import
android.os.Parcelable;
import
android.support.v4.view.PagerAdapter;
import
android.support.v4.view.ViewPager;
import
android.support.v4.view.ViewPager.OnPageChangeListener;
import
android.util.AttributeSet;
import
android.view.Gravity;
import
android.view.MotionEvent;
import
android.view.View;
import
android.widget.FrameLayout;
import
com.example.p029_banner_lunbo.R;
import
java.lang.ref.WeakReference;
public
class
BannerView
extends
FrameLayout {
private
static
final
int
MSG_RUN =
1
;
private
ViewPager mViewPager;
/**
* 导航的小点
*/
private
DotIndicatorView mIndicator;
private
Adapter mAdapter;
/**
* 是否处于滑动的状态
*/
private
boolean
isScrolling;
private
int
mIndicatorPosition;
// center_hori left
/**
* 是否显示indicator
*/
private
boolean
isShowIndicator =
true
;
private
boolean
isTouch;
private
Handler mHandler;
private
BannerViewHelper mHelper;
private
int
mScrollTime;
public
BannerView(Context context, AttributeSet attrs) {
this
(context, attrs,
0
);
}
public
BannerView(Context context, AttributeSet attrs,
int
defStyle) {
super
(context, attrs, defStyle);
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.BannerView,
defStyle,
0
);
mIndicatorPosition = ta.getInt(R.styleable.BannerView_indicator_position,
0
);
isShowIndicator = ta.getBoolean(R.styleable.BannerView_indicator_visible,
true
);
mScrollTime = ta.getInteger(R.styleable.BannerView_scroll_time,
3000
);
isScrolling = ta.getBoolean(R.styleable.BannerView_auto_start,
false
);
ta.recycle();
initView(context);
}
private
void
initView(Context context) {
mViewPager =
new
ViewPager(context);
mViewPager.addOnPageChangeListener(mOnPageChangeListener);
addView(mViewPager);
//, viewPagerParams);
mHandler =
new
H(mViewPager);
mIndicator =
new
DotIndicatorView(context);
LayoutParams indicatorParams =
new
LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
if
(mIndicatorPosition ==
0
) {
indicatorParams.gravity = Gravity.BOTTOM | Gravity.LEFT;
}
else
if
(mIndicatorPosition ==
1
) {
indicatorParams.gravity = Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL;
}
else
if
(mIndicatorPosition ==
2
) {
indicatorParams.gravity = Gravity.BOTTOM | Gravity.RIGHT;
}
indicatorParams.bottomMargin =
20
;
if
(!isShowIndicator) {
return
;
}
addView(mIndicator, indicatorParams);
}
@Override
protected
void
onAttachedToWindow() {
if
(isScrolling) {
startScroll();
}
super
.onAttachedToWindow();
mHelper =
new
BannerViewHelper(
this
);
}
@Override
public
boolean
dispatchTouchEvent(MotionEvent ev) {
if
(mHelper !=
null
) {
mHelper.resolveTouchConflict(ev);
}
return
super
.dispatchTouchEvent(ev);
}
@Override
protected
LayoutParams generateDefaultLayoutParams() {
return
new
LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT);
}
@Override
public
LayoutParams generateLayoutParams(AttributeSet attrs) {
return
new
LayoutParams(getContext(), attrs);
}
@Override
protected
android.view.ViewGroup.LayoutParams generateLayoutParams(
android.view.ViewGroup.LayoutParams p) {
return
new
LayoutParams(p);
}
@Override
protected
boolean
checkLayoutParams(android.view.ViewGroup.LayoutParams p) {
return
p
instanceof
LayoutParams;
}
private
OnPageChangeListener mOnPageChangeListener =
new
OnPageChangeListener() {
@Override
public
void
onPageSelected(
int
position) {
int
relCount = mAdapter.getRealCount();
if
(relCount <=
0
) {
mIndicator.current(
0
);
}
else
{
mIndicator.current(position % relCount);
}
}
@Override
public
void
onPageScrolled(
int
arg0,
float
arg1,
int
arg2) {
}
@Override
public
void
onPageScrollStateChanged(
int
arg0) {
isTouch = arg0 == ViewPager.SCROLL_STATE_DRAGGING;
if
(arg0 == ViewPager.SCROLL_STATE_IDLE && isScrolling) {
mHandler.removeMessages(MSG_RUN);
Message msg = mHandler.obtainMessage(MSG_RUN, isScrolling ?
1
:
0
, isTouch ?
1
:
0
);
mHandler.sendMessageDelayed(msg, mScrollTime);
}
}
};
/**
* 开始自动滚动
*/
public
void
startScroll() {
mHandler.removeMessages(MSG_RUN);
isScrolling =
true
;
Message msg = mHandler.obtainMessage(MSG_RUN,
1
, isTouch ?
1
:
0
);
mHandler.sendMessageDelayed(msg, mScrollTime);
}
/**
* 停止自动滚动
*/
public
void
stopScroll() {
isScrolling =
false
;
if
(mHandler !=
null
) {
mHandler.removeMessages(MSG_RUN);
}
}
@Override
protected
Parcelable onSaveInstanceState() {
Bundle bundle =
new
Bundle();
bundle.putBoolean(
"scroll"
, isScrolling);
bundle.putParcelable(
"state"
,
super
.onSaveInstanceState());
return
bundle;
}
@Override
protected
void
onRestoreInstanceState(Parcelable state) {
Bundle bundle = (Bundle) state;
isScrolling = bundle.getBoolean(
"scroll"
);
state = bundle.getParcelable(
"state"
);
if
(state !=
null
) {
super
.onRestoreInstanceState(state);
}
}
// @Override
// protected void onAttachedToWindow() {
// super.onAttachedToWindow();
// if(isScrolling) mHandler.sendEmptyMessage(MSG_RUN);
// }
@Override
protected
void
onDetachedFromWindow() {
mHandler.removeMessages(MSG_RUN);
super
.onDetachedFromWindow();
}
/**
* 设置banner的数据集合
*/
public
void
setAdapter(Adapter adapter) {
mAdapter = adapter;
mViewPager.setAdapter(adapter);
mIndicator.create(adapter.getRealCount());
}
/**
* 获取adapter
*/
public
Adapter getAdapter() {
return
mAdapter;
}
public
int
getCurrent() {
return
mViewPager.getCurrentItem() +
1
;
}
public
void
setCurrent(
int
current) {
mViewPager.setCurrentItem(current);
}
private
static
class
H
extends
Handler {
private
WeakReference<ViewPager> mViewPager;
public
H(ViewPager pager) {
mViewPager =
new
WeakReference<>(pager);
}
public
void
handleMessage(Message msg) {
if
(mViewPager.get() ==
null
)
return
;
boolean
isScrolling = msg.arg1 ==
1
;
boolean
isTouch = msg.arg2 ==
1
;
if
(msg.what == MSG_RUN && isScrolling) {
if
(!isTouch) {
int
pos = mViewPager.get().getCurrentItem() +
1
;
mViewPager.get().setCurrentItem(pos);
// sendEmptyMessageDelayed(MSG_RUN, 3000);
}
else
{
removeMessages(MSG_RUN);
}
}
}
}
public
static
abstract
class
Adapter
extends
PagerAdapter {
@Override
public
final
int
getCount() {
return
Integer.MAX_VALUE;
}
/**
* 获取真实的数据统计
*
* @return
*/
public
abstract
int
getRealCount();
@Override
public
final
boolean
isViewFromObject(View arg0, Object arg1) {
return
arg0 == arg1;
}
public
Object getItem(
int
position) {
return
position;
}
}
}
|
BannerViewHelper:(用于解决BannerView和SwipeRefreshLayout的冲突)
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
|
package
com.example.p029_banner_lunbo.bannerutils;
import
android.support.v4.widget.SwipeRefreshLayout;
import
android.view.MotionEvent;
import
android.view.VelocityTracker;
import
android.view.ViewGroup;
/**
* 用于解决BannerView和SwipeRefreshLayout的冲突
* @author geek
*
*/
public
class
BannerViewHelper {
private
BannerView mBannerView;
private
SwipeRefreshLayout mSwipeRefreshLayout;
private
VelocityTracker mVelocityTracker;
private
float
mAccuracy =
1
.f;
public
BannerViewHelper(BannerView bannerView) {
mBannerView = bannerView;
mSwipeRefreshLayout = findSwipeRefreshLayout();
}
public
BannerViewHelper(BannerView bannerView,
float
accuracy) {
this
(bannerView);
mAccuracy = accuracy;
}
public
void
resolveTouchConflict(MotionEvent event) {
if
(mSwipeRefreshLayout ==
null
)
return
;
setupVelocityTracker(event);
switch
(event.getAction()) {
case
MotionEvent.ACTION_MOVE:
if
(!mSwipeRefreshLayout.isEnabled())
return
;
mVelocityTracker.computeCurrentVelocity(
1000
);
if
(Math.abs(mVelocityTracker.getXVelocity()) >
Math.abs(mVelocityTracker.getYVelocity()) * mAccuracy) {
mSwipeRefreshLayout.setEnabled(
false
);
}
break
;
case
MotionEvent.ACTION_UP:
case
MotionEvent.ACTION_CANCEL:
mSwipeRefreshLayout.setEnabled(
true
);
recycleVelocityTracker();
default
:
break
;
}
}
private
void
setupVelocityTracker(MotionEvent event) {
if
(mVelocityTracker ==
null
) mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(event);
}
private
void
recycleVelocityTracker() {
if
(mVelocityTracker !=
null
) {
mVelocityTracker.clear();
mVelocityTracker.recycle();
mVelocityTracker =
null
;
}
}
private
SwipeRefreshLayout findSwipeRefreshLayout() {
ViewGroup parent = (ViewGroup) mBannerView.getParent();
while
(parent !=
null
&& parent.getId() != android.R.id.content) {
if
(parent
instanceof
SwipeRefreshLayout)
return
(SwipeRefreshLayout) parent;
parent = (ViewGroup) parent.getParent();
}
return
null
;
}
}
|
xml布局:
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
|
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<RelativeLayout xmlns:android=
"http://schemas.android.com/apk/res/android"
xmlns:app=
"http://schemas.android.com/apk/res-auto"
android:layout_width=
"match_parent"
android:layout_height=
"match_parent"
android:orientation=
"vertical"
>
<LinearLayout
android:layout_width=
"match_parent"
android:layout_height=
"wrap_content"
android:background=
"#ccc"
android:orientation=
"vertical"
>
<com.example.p029_banner_lunbo.bannerutils.BannerView
android:id=
"@+id/banner"
android:layout_width=
"match_parent"
android:layout_height=
"400dp"
app:indicator_position=
"center"
app:indicator_visible=
"false"
app:scroll_time=
"8000"
/>
</LinearLayout>
<TextView
android:id=
"@+id/tv_left"
android:layout_width=
"wrap_content"
android:layout_height=
"wrap_content"
android:background=
"@drawable/icon_left"
/>
<TextView
android:id=
"@+id/tv_right"
android:layout_width=
"wrap_content"
android:layout_height=
"wrap_content"
android:layout_alignParentRight=
"true"
android:background=
"@drawable/icon_right"
/>
</RelativeLayout>
|
调用方法:
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
|
tv_left = (TextView) findViewById(R.id.tv_left);
tv_left.setOnClickListener(
new
View.OnClickListener() {
@Override
public
void
onClick(View v) {
//左←
ToastUtil.showToastShort(MainActivity.
this
,
"左"
);
mBannerView.setCurrent(mBannerView.getCurrent() -
2
);
}
});
tv_right = (TextView) findViewById(R.id.tv_right);
tv_right.setOnClickListener(
new
View.OnClickListener() {
@Override
public
void
onClick(View v) {
//右→
ToastUtil.showToastShort(MainActivity.
this
,
"右"
);
mBannerView.setCurrent(mBannerView.getCurrent());
}
});
mBannerView = (BannerView) findViewById(R.id.banner);
Data1();
mBannerView.setAdapter(
new
BannerAdapter(
this
, mList1));
mBannerView.stopScroll();
mBannerView.startScroll();
|
代码已经整理好,效果如下图:
图1:
图2:
图2:
地址:https://github.com/geeklx/MyApplication/tree/master/p029_banner_lunbo
附:
本文转自 吴雨声 51CTO博客,原文链接:http://blog.51cto.com/liangxiao/1953066,如需转载请自行联系原作者