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
短信预约 -IT技能 免费直播动态提醒
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:class="lazy" data-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网网站的支持！
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