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。

     转载请注明出处：http://blog.csdn.net/sk719887916/article/details/40348873 作者skay:

     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：
 

u

   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, 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

    转载请注明出处：http://blog.csdn.net/sk719887916/article/details/40348873 作者skay:
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