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

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, 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，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我们网站的支持！