退不回,国产汽车标志大全,从化钟楼古村
本文实例为大家分享了自定义view实现了类似百度手机助手，首页评论滚动效果。
看效果：
gif做的不好，其效果就是：几个viewitem不停的向上滚动，新加入item有个淡入的效果。
说下实现思路：自定义view继承至linearlayout，控制item数量及其动画效果，实现item复用，传入数据即可，使用方便。
代码：
我要评论
/**
* jiantao.yang
*
* @description 仿百度手机助手，评论滚动效果
* @time 2015/1/16 17:37
*/
public class viewflipper extends linearlayout {
private final int max_show_item_size = 5;
private iadapter miadapter;
private int mcount;
//最后一个item动画
private animation mlastoneanimation;
//其它item动画
private animation mcommonanimation;
//数据下标
private int mcurrentindex;
/**
* 这里动画时间是1600毫秒，所以间隔得大于动画时间
*/
private static final int default_interval = 2000;
private int mflipinterval = default_interval;
private boolean mautostart = false;
private boolean mrunning = false;
private boolean mstarted = false;
private boolean mvisible = false;
private boolean muserpresent = true;
public viewflipper(context context) {
super(context);
init(context);
}
public viewflipper(context context, attributeset attrs) {
super(context, attrs);
init(context);
}
public viewflipper(context context, attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
init(context);
}
private final broadcastreceiver mreceiver = new broadcastreceiver() {
@override
public void onreceive(context context, intent intent) {
final string action = intent.getaction();
if (intent.action_screen_off.equals(action)) {
muserpresent = false;
updaterunning();
} else if (intent.action_user_present.equals(action)) {
muserpresent = true;
updaterunning(false);
}
}
};
@override
protected void onattachedtowindow() {
super.onattachedtowindow();
// listen for broadcasts related to user-presence
final intentfilter filter = new intentfilter();
filter.addaction(intent.action_screen_off);
filter.addaction(intent.action_user_present);
// ok, this is gross but needed. this class is supported by the
// remote views machanism and as a part of that the remote views
// can be inflated by a context for another user without the app
// having interact users permission - just for loading resources.
// for exmaple, when adding widgets from a user profile to the
// home screen. therefore, we register the receiver as the current
// user not the one the context is for.
getcontext().registerreceiver(mreceiver, filter);
if (mautostart) {
// automatically start when requested
startflipping();
}
}
@override
protected void ondetachedfromwindow() {
super.ondetachedfromwindow();
mvisible = false;
getcontext().unregisterreceiver(mreceiver);
updaterunning();
}
@override
protected void onwindowvisibilitychanged(int visibility) {
super.onwindowvisibilitychanged(visibility);
mvisible = visibility == visible;
updaterunning(mvisible);
// updaterunning(false);
}
private void init(context context) {
this.setorientation(linearlayout.vertical);
}
public void setiadapter(iadapter iadapter) {
this.miadapter = iadapter;
initshowitems();
}
public void startflipping() {
mstarted = true;
updaterunning();
}
public void stopflipping() {
mstarted = false;
updaterunning();
}
private void updaterunning() {
updaterunning(true);
}
/**
* returns true if the child views are flipping.
*/
public boolean isflipping() {
return mstarted;
}
/**
* set if this view automatically calls {@link #startflipping()} when it
* becomes attached to a window.
*/
public void setautostart(boolean autostart) {
mautostart = autostart;
}
/**
* returns true if this view automatically calls {@link #startflipping()}
* when it becomes attached to a window.
*/
public boolean isautostart() {
return mautostart;
}
@override
public void oninitializeaccessibilityevent(accessibilityevent event) {
super.oninitializeaccessibilityevent(event);
event.setclassname(viewflipper.class.getname());
}
@override
public void oninitializeaccessibilitynodeinfo(accessibilitynodeinfo info) {
super.oninitializeaccessibilitynodeinfo(info);
info.setclassname(viewflipper.class.getname());
}
/**
* 初始化childviews
*/
private void initshowitems() {
if (miadapter != null) {
mcount = miadapter.getcount();
for (int i = 0; i < mcount; i++) {
if (i == max_show_item_size) {
break;
}
view convertview = getchildat(i);
view item = miadapter.getitemview(convertview, i);
addview(item, i);
}
}
}
/**
* internal method to start or stop dispatching flip {@link android.os.message} based
* on {@link #mrunning} and {@link #mvisible} state.
*
* @param flipnow determines whether or not to execute the animation now, in
* addition to queuing future flips. if omitted, defaults to
* true.
*/
private void updaterunning(boolean flipnow) {
boolean running = mvisible && mstarted && muserpresent;
system.out.println(" updaterunning running:" + running + " mvisible " + mvisible + " userpresent " + muserpresent);
if (running != mrunning) {
if (running && (mcount > max_show_item_size)) {
showitems(mcurrentindex++, flipnow);
message msg = mhandler.obtainmessage(flip_msg);
mhandler.sendmessagedelayed(msg, mflipinterval);
} else {
mhandler.removemessages(flip_msg);
}
mrunning = running;
}
}
private void showitems(final int position, boolean animate) {
if (animate && (mlastoneanimation == null || mcommonanimation == null)) {
mlastoneanimation = animationutils.loadanimation(getcontext(), r.anim.lastone_anim);
mcommonanimation = animationutils.loadanimation(getcontext(), r.anim.common_anim);
}
int childcount = getchildcount();
for (int i = 0; i < childcount; i++) {
view child = getchildat(i);
child.clearanimation();
int index = position + i;
child = miadapter.getitemview(child, (index >= miadapter.getcount()) ? (index - miadapter.getcount()) : index);
if (animate) {
if (i == childcount - 1) {
child.setanimation(mlastoneanimation);
} else {
child.setanimation(mcommonanimation);
}
}
child.setvisibility(view.visible);
}
if (animate) {
mcommonanimation.startnow();
mlastoneanimation.startnow();
}
//保证传入的position小于getcount
if (mcurrentindex >= miadapter.getcount()) {
mcurrentindex = 0;
}
}
private final int flip_msg = 1;
private final handler mhandler = new handler() {
@override
public void handlemessage(message msg) {
if (msg.what == flip_msg) {
if (mrunning) {
showitems(mcurrentindex++, true);
msg = obtainmessage(flip_msg);
sendmessagedelayed(msg, mflipinterval);
}
}
}
};
public interface iadapter {
/**
* @param convertview
* @param position
* @return
*/
public view getitemview(view convertview, int position);
/**
* @return 数据count
*/
public int getcount();
}
}
再来看看调用部分：
public class mainactivity extends actionbaractivity implements viewflipper.iadapter {
viewflipper viewflipper;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
viewflipper = (viewflipper) findviewbyid(r.id.view_flipper);
viewflipper.setiadapter(this);
}
@override
protected void onresume() {
super.onresume();
viewflipper.startflipping();
}
@override
public view getitemview(view convertview, int position) {
view item = null;
textview textview;
if (convertview == null) {
item = view.inflate(this, r.layout.item, null);
} else {
item = convertview;
}
textview = (textview) item.findviewbyid(r.id.textview);
textview.settext("测试数据:" + position);
return item;
}
@override
public int getcount() {
return 8;
}
}
可以看出，mainactivity实现了viewflipper.iadapter接口，setadapter后调用startflipper即可。
这里布局文件我就不贴出来了，附上，项目里动画时间有点长，修改下就ok。
限于水平有限，不足之处难免，望各位不舍指正，与君共勉。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。
如对本文有疑问，请在下面进行留言讨论，广大热心网友会与你互动！！ 点击进行留言回复
Android apk 项目一键打包并上传到蒲公英的实现方法
Android 自定义LineLayout实现满屏任意拖动功能的示例代码
android 限制某个操作每天只能操作指定的次数(示例代码详解)
Android 集成 google 登录并获取性别等隐私信息的实现代码
网友评论