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。
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,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 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,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,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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对编程小技巧网站的支持！
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