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

2019-12-12 04:01:07

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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。

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：