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最近参与了开发一款旅行app，其中包含实时聊天和动态评论功能，终于耗时几个月几个伙伴完成了，今天就小结一下至于实时聊天功能如果用户不多的情况可以scoket实现，如果用户万级就可以采用开源的smack + opnefile实现，也可以用mina开源+xmmp,至于怎么搭建和实现，估计目前github上一搜一大把，至于即时通讯怕误人子弟，暂且不做介绍，现就把实现的一个微信朋友圈的小功能介绍一下。
先上效果图:
一拿到主流的ui需求，大致分析下，需要我listview嵌套gridview，而gridview的行数也和图片总数有关系，因此通过个数我们可以动态设置条目的宽高，而点击图片放大我们可一跳转到另一界面，图片左右滑动可以用viewpager实现，双击图片放大和手指缩放图片也可以用就监听手势进行不断放大，对于安卓事件不熟悉的朋友可以直接使用一个著名的photoview开源项目，支持手势缩放图片和滑动图片实现画廊功能，也很好的解决了内存溢出问题。
一 配置imageloader
本项目中加载网络图片我就直接使用imageloader，但建议还是去看下源码，因为开源项目本身自带缓存机制，有很好的缓存技巧，有很多东西值得我们借鉴。其不仅可以加载本地图片(文件path)，也支持加载网络图片（url），并且自带防止内存溢出功能。
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public class myapplication extends application {
@override
public void oncreate() {
super.oncreate();
displayimageoptions defaultoptions = new displayimageoptions
.builder()
.showimageforemptyuri(r.drawable.empty_photo)
.showimageonfail(r.drawable.empty_photo)
.cacheinmemory(true)
.cacheondisc(true)
.build();
imageloaderconfiguration config = new imageloaderconfiguration
.builder(getapplicationcontext())
.defaultdisplayimageoptions(defaultoptions)
.disccachesize(50 * 1024 * 1024)//
.disccachefilecount(100)//缓存一百张图片
.writedebuglogs()
.build();
imageloader.getinstance().init(config);
}
}
二 准备主界面和需要的基础类
1 listadapter
public class fridlistadapter extends baseadapter{
private arraylist<mybean> mlist;
private layoutinflater minflater;
private context mcontext;
public fridlistadapter(context context,arraylist<mybean> list) {
minflater = layoutinflater.from(context);
mcontext=context;
this.mlist=list;
}
@override
public int getcount() {
return mlist==null?0:mlist.size();
}
@override
public mybean getitem(int position) {
return mlist.get(position);
}
@override
public long getitemid(int position) {
return getitem(position).id;
}
@override
public view getview(int position, view convertview, viewgroup parent) {
viewholder holder;
if (convertview == null) {
holder = new viewholder();
convertview = minflater.inflate(r.layout.list_item, null);
holder.avator=(imageview)convertview.findviewbyid(r.id.avator);
holder.name=(textview)convertview.findviewbyid(r.id.name);
holder.content = (textview) convertview.findviewbyid(r.id.content);
holder.gridview=(noscrollgridview)convertview.findviewbyid(r.id.gridview);
convertview.settag(holder);
} else {
holder = (viewholder) convertview.gettag();
}
final mybean bean = getitem(position);
//加载网络图片
imageloader.getinstance().displayimage(bean.avator, holder.avator);
holder.name.settext(bean.name);
holder.content.settext(bean.content);
if(bean.urls!=null&&bean.urls.length>0){
holder.gridview.setvisibility(view.visible);
holder.gridview.setadapter(new dynamicgridadapter(bean.urls, mcontext));
holder.gridview.setonitemclicklistener(new adapterview.onitemclicklistener() {
@override
public void onitemclick(adapterview<?> parent, view view, int position, long id) {
imagebrower(position,bean.urls);
}
});
}else{
holder.gridview.setvisibility(view.gone);
}
return convertview;
}
private void imagebrower(int position, string[] urls) {
intent intent = new intent(mcontext, imagepageractivity.class);
// 图片url,为了演示这里使用常量，一般从数据库中或网络中获取
intent.putextra(imagepageractivity.extra_image_urls, urls);
intent.putextra(imagepageractivity.extra_image_index, position);
mcontext.startactivity(intent);
}
// 优化listview
private static class viewholder {
public textview name;
public imageview avator;
textview content;
noscrollgridview gridview;
}
}
2 主界面
实际项目中数据是数据是从服务器获取的，本次就只将图片从网络获取，
public class mainactivity extends listactivity {
public static final string tag = "mainactivity";
private fridlistadapter madapter;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
new loderdatatask().execute();
}
class loderdatatask extends asynctask<void, void, messagemodle> {
@override
protected messagemodle doinbackground(void... params) {
gson gson = new gson();
messagemodle msg = gson.fromjson(getdata(), messagemodle.class);
return msg;
}
@override
protected void onpostexecute(messagemodle result) {
madapter = new fridlistadapter(mainactivity.this, result.list);
setlistadapter(madapter);
}
}
private string getdata() {
// 模拟网络获取数据
string json = "{\"code\":200,\"msg\":\"ok\",list:["
+ "{\"id\":110,\"avator\":\"http://img0.bdstatic.com/img/image/shouye/leimu/mingxing.jpg\",\"name\":\"赵薇\",\"content\":\"今天不开心!\",\"urls\":[]},"
+ "{\"id\":111,\"avator\":\"http://image.cnwest.com/attachement/jpg/site1/20110507/001372d8a36f0f2f4c953a.jpg\",\"name\":\"李晨\",\"content\":\"我们\","
+ " \"urls\":[\"http://guangdong.sinaimg.cn/2015/0530/u11307p693dt20150530094310.jpg\"]},"
+ "{\"id\":114,\"avator\":\"http://img.hexun.com/2009-05-01/117287830.jpg\",\"name\":\"小马哥\",\"content\":\"今天淘宝了吗\",\"urls\":["
+ "\"http://g.hiphotos.bdimg.com/album/s%3d680%3bq%3d90/sign=ccd33b46d53f8794d7ff4b26e2207fc9/0d338744ebf81a4c0f993437d62a6059242da6a1.jpg\","
+ "\"http://f.hiphotos.bdimg.com/album/s%3d680%3bq%3d90/sign=6b62f61bac6eddc422e7b7f309e0c7c0/6159252dd42a2834510deef55ab5c9ea14cebfa1.jpg\","
+ "\"http://g.hiphotos.bdimg.com/album/s%3d680%3bq%3d90/sign=e58fb67bc8ea15ce45eee301863b4bce/a5c27d1ed21b0ef4fd6140a0dcc451da80cb3e47.jpg\","
+ "\"http://c.hiphotos.bdimg.com/album/s%3d680%3bq%3d90/sign=cdab1512d000baa1be2c44b3772bc82f/91529822720e0cf3855c96050b46f21fbf09aaa1.jpg\"]},"
+ "{\"id\":112,\"avator\":\"http://img3.yxlady.com/yl/uploadfiles_5361/20150528/20150528050208705.jpg\",\"name\":\"邓超\",\"content\":\"奔跑吧兄弟！ 欢迎收看！\",\"urls\":[\"http://upload.cbg.cn/2015/0305/1425518659246.jpg\","
+ "\"http://www.people.com.cn/mediafile/pic/20150619/30/4179219540177204330.jpg\"]},"
+ "{\"id\":113,\"avator\":\"http://img4.imgtn.bdimg.com/it/u=945108765,1070109457&fm=21&gp=0.jpg\",\"name\":\"奥巴马\",\"content\":\"holle\",\"urls\":[\"http://f.hiphotos.bdimg.com/album/s%3d680%3bq%3d90/sign=6b62f61bac6eddc422e7b7f309e0c7c0/6159252dd42a2834510deef55ab5c9ea14cebfa1.jpg\",\"http://g.hiphotos.bdimg.com/album/s%3d680%3bq%3d90/sign=e58fb67bc8ea15ce45eee301863b4bce/a5c27d1ed21b0ef4fd6140a0dcc451da80cb3e47.jpg\",\"http://c.hiphotos.bdimg.com/album/s%3d680%3bq%3d90/sign=cdab1512d000baa1be2c44b3772bc82f/91529822720e0cf3855c96050b46f21fbf09aaa1.jpg\"]}]}";
return json;
}
3 gridview的adapter
因为listview的条目中包含gridview,在这里还需要为它创建atapter
由于adapter没太多技术含量，因此重点部分列出，在这里我们需要判断下适配的数据眼总数，微信最大数是9张，显示一张的时候，图片比较大，两张的时候稍微减少，四张的时候两列两行和两张的大小一致，其他张数的时候都是三行三列的九宫格。
@override
public view getview(int position, view convertview, viewgroup parent) {
mygridviewholder viewholder;
if (convertview == null) {
viewholder = new mygridviewholder();
convertview = mlayoutinflater.inflate(r.layout.gridview_item,
parent, false);
viewholder.imageview = (imageview) convertview
.findviewbyid(r.id.album_image);
convertview.settag(viewholder);
} else {
viewholder = (mygridviewholder) convertview.gettag();
}
string url = getitem(position);
if (getcount() == 1) {
viewholder.imageview.setlayoutparams(new android.widget.abslistview.layoutparams(300, 250));
}
if (getcount() == 2 ||getcount() == 4) {
viewholder.imageview.setlayoutparams(new android.widget.abslistview.layoutparams(200, 200));
}
imageloader.getinstance().displayimage(url, viewholder.imageview);
return convertview;
}
4 新建用于支持九宫格自定义的gridview
public class noscrollgridview extends gridview {
public noscrollgridview(context context) {
super(context);
}
public noscrollgridview(context context, attributeset attrs) {
super(context, attrs);
}
@override
protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
int expandspec = 0;
int size = getadapter().getcount();
if (size == 1) {
setnumcolumns(1);
}
if ( size==2 || size == 4 ) {
setnumcolumns(2);
}
else {
setnumcolumns(3);
}
expandspec = measurespec.makemeasurespec(integer.max_value >> 2,measurespec.at_most);
super.onmeasure(widthmeasurespec,expandspec );
}
}
三 点击图片后的基础类
1 建立大图查看器viewpaer
public class imagepageractivity extends fragmentactivity {
private static final string state_position = "state_position";
public static final string extra_image_index = "image_index";
public static final string extra_image_urls = "image_urls";
private hackyviewpager mpager;
private int pagerposition;
private textview indicator;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.image_detail_pager);
pagerposition = getintent().getintextra(extra_image_index, 0);
string[] urls = getintent().getstringarrayextra(extra_image_urls);
mpager = (hackyviewpager) findviewbyid(r.id.pager);
imagepageradapter madapter = new imagepageradapter(
getsupportfragmentmanager(), urls);
mpager.setadapter(madapter);
indicator = (textview) findviewbyid(r.id.indicator);
charsequence text = getstring(r.string.viewpager_indicator, 1, mpager
.getadapter().getcount());
indicator.settext(text);
// 更新下标
mpager.setonpagechangelistener(new onpagechangelistener() {
@override
public void onpagescrollstatechanged(int arg0) {
}
@override
public void onpagescrolled(int arg0, float arg1, int arg2) {
}
@override
public void onpageselected(int arg0) {
charsequence text = getstring(r.string.viewpager_indicator,
arg0 + 1, mpager.getadapter().getcount());
indicator.settext(text);
}
});
if (savedinstancestate != null) {
pagerposition = savedinstancestate.getint(state_position);
}
mpager.setcurrentitem(pagerposition);
}
@override
public void onsaveinstancestate(bundle outstate) {
outstate.putint(state_position, mpager.getcurrentitem());
}
private class imagepageradapter extends fragmentstatepageradapter {
public string[] filelist;
public imagepageradapter(fragmentmanager fm, string[] filelist) {
super(fm);
this.filelist = filelist;
}
@override
public int getcount() {
return filelist == null ? 0 : filelist.length;
}
@override
public fragment getitem(int position) {
string url = filelist[position];
return imagedetailfragment.newinstance(url);
}
}
2 查看大图界面
public class imagedetailfragment extends fragment {
private string mimageurl;
private imageview mimageview;
private progressbar progressbar;
private photoviewattacher mattacher;
public static imagedetailfragment newinstance(string imageurl) {
final imagedetailfragment f = new imagedetailfragment();
final bundle args = new bundle();
args.putstring("url", imageurl);
f.setarguments(args);
return f;
}
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
mimageurl = getarguments() != null ? getarguments().getstring("url") : null;
}
@override
public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {
final view v = inflater.inflate(r.layout.image_detail_fragment, container, false);
mimageview = (imageview) v.findviewbyid(r.id.image);
mattacher = new photoviewattacher(mimageview);
mattacher.setonphototaplistener(new onphototaplistener() {
@override
public void onphototap(view arg0, float arg1, float arg2) {
getactivity().finish();
}
});
progressbar = (progressbar) v.findviewbyid(r.id.loading);
return v;
}
@override
public void onactivitycreated(bundle savedinstancestate) {
super.onactivitycreated(savedinstancestate);
imageloader.getinstance().displayimage(mimageurl, mimageview, new simpleimageloadinglistener() {
@override
public void onloadingstarted(string imageuri, view view) {
progressbar.setvisibility(view.visible);
}
@override
public void onloadingfailed(string imageuri, view view, failreason failreason) {
string message = null;
switch (failreason.gettype()) {
case io_error:
message = "下载错误";
break;
case decoding_error:
message = "图片无法显示";
break;
case network_denied:
message = "网络有问题，无法下载";
break;
case out_of_memory:
message = "图片太大无法显示";
break;
case unknown:
message = "未知的错误";
break;
}
toast.maketext(getactivity(), message, toast.length_short).show();
progressbar.setvisibility(view.gone);
}
@override
public void onloadingcomplete(string imageuri, view view, bitmap loadedimage) {
progressbar.setvisibility(view.gone);
mattacher.update();
}
});
}
四 界面的头像圆形
圆形头像用主流的circleimageview.jar的框架，但是有兴趣的朋友也可以自定义imagview采用重写ondrawi()画圆形的方式将bitmap画上去，由于此demo整体功能较复杂，因此使用第三方的东西，listview条目布局如下：
<relativelayout 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:padding="6dp" >
<de.hdodenhof.circleimageview.circleimageview
android:id="@+id/avator"
android:layout_width="48dp"
android:layout_height="48dp"
android:src="@drawable/empty_photo" />
<textview
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginleft="10dp"
android:layout_torightof="@id/avator"
android:textcolor="#576b95"
android:textsize="16sp"
android:text="name" />
<textview
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/name"
android:layout_marginleft="10dp"
android:textsize="12sp"
android:layout_torightof="@id/avator"
android:text="content" />
<com.loveplusplus.demo.image.noscrollgridview
android:id="@+id/gridview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingtop="5dp"
android:layout_below="@id/content"
android:layout_marginleft="10dp"
android:layout_torightof="@id/avator"
android:horizontalspacing="1dp"
android:numcolumns="3"
android:visibility="gone"
android:verticalspacing="1dp" />
</relativelayout>
接下来我们还需要将主流的photoview.jar加入到工程中，
总结一下实现以上功能我们使用了第三的imagloader，支持手势缩放的photoview,圆形图像的circleimageview，熟悉安卓view绘制机制加载过程，事件传递和分发的朋友是不需要第三方开源项目的支持的，但是对于入门不久的同学，学会怎样使用开源框架就可以，但是想要提高开源项目的的核心还是需要了解的，欢迎阅读
运行效果图：
有兴趣的朋友建议阅读下：
安卓事件机制（一）和上篇关于view的博文。谢谢交流和分享。
demo源码下载地址：https://github.com/tamicer/chatmomentdemo
以上所述是小编给大家介绍的android 高仿微信朋友圈动态支持双击手势放大并滑动查看图片效果，希望对大家有所帮助
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