转载请注明出处:http://blog.csdn.net/allen315410/article/details/40264551
看博文之前,希望大家先打开自己的微信点到朋友圈中去,仔细观察是不是发现朋友圈里的有个“九宫格”的图片区域,点击图片又会跳到图片的详细查看页面,并且支持图片的滑动和缩放?这个功能是不是很常用呢?!那么我今天正好做了这个Demo,下面为大家讲解一下。首先按照惯例先看一下效果图吧,尤其不会录制gif动画(哎~没办法,模拟器不支持多点触控,刚好我的手机又没有Root,不能录屏,悲催啊,大家见谅,想要看真实效果的话,烦请移到博文最下方,点击下载源码,运行后再看效果哈~~),这里先就拿几张静态的图片顶替一下好了。见谅!
主页ListView的效果: 点击九宫格图片跳转到大图 多点触控,缩放图片
效果嘛,将就着看吧!实在看不明白就想想微信朋友圈,或者拖到下方,点击下载源码!这里,首先分析一下主界面吧,布局都是很简单的,主界面仅仅就是一个ListView的控件,ListView的Item上值得注意的是,Item上包含了一个GridView,这个GridView呗用作实现“九宫格”的效果,主界面布局就是一个ListView,这里不说了,我们先来看看ListView的Item的布局吧,以下是item_list.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="5dp" android:paddingTop="5dp" > <ImageView android:id="@+id/iv_avatar" android:layout_width="50dp" android:layout_height="50dp" android:background="@drawable/ic_launcher" android:scaleType="centerCrop" /> <TextView android:id="@+id/tv_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5dp" android:layout_toRightOf="@id/iv_avatar" android:text="爷,今天心情好!" android:textSize="16sp" /> <TextView android:id="@+id/tv_content" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/tv_title" android:layout_marginLeft="5dp" android:layout_marginTop="3dp" android:layout_toRightOf="@id/iv_avatar" android:text="今天又是雾霾!" android:textSize="16sp" /> <com.example.imagedemo.NoScrollGridView android:id="@+id/gridview" android:layout_width="220dp" android:layout_height="wrap_content" android:layout_below="@id/tv_content" android:layout_marginLeft="5dp" android:layout_marginTop="3dp" android:layout_toRightOf="@id/iv_avatar" android:columnWidth="70dp" android:gravity="center" android:horizontalSpacing="2.5dp" android:numColumns="3" android:stretchMode="columnWidth" android:verticalSpacing="2.5dp" /> </RelativeLayout>
package com.example.imagedemo; import android.content.Context; import android.util.AttributeSet; import android.widget.GridView; /** * 自定义的“九宫格”——用在显示帖子详情的图片集合 解决的问题:GridView显示不全,只显示了一行的图片,比较奇怪,尝试重写GridView来解决 * * @author lichao * @since 2014-10-16 16:41 * */ public class NoScrollGridView extends GridView { public NoScrollGridView(Context context) { super(context); // TODO Auto-generated constructor stub } public NoScrollGridView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub } public NoScrollGridView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, expandSpec); } }
public class ItemEntity { private String avatar; // 用户头像URL private String title; // 标题 private String content; // 内容 private ArrayList<String> imageUrls; // 九宫格图片的URL集合 public ItemEntity(String avatar, String title, String content, ArrayList<String> imageUrls) { super(); this.avatar = avatar; this.title = title; this.content = content; this.imageUrls = imageUrls; } ... }好了,有了ListView,那么不可避免的就是做Item上的数据适配了。继承一个BaseAdapter,代码如下,都比较简单:
/** * 首页ListView的数据适配器 * * @author Administrator * */ public class ListItemAdapter extends BaseAdapter { private Context mContext; private ArrayList<ItemEntity> items; public ListItemAdapter(Context ctx, ArrayList<ItemEntity> items) { this.mContext = ctx; this.items = items; } @Override public int getCount() { return items == null ? 0 : items.size(); } @Override public Object getItem(int position) { return items.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { holder = new ViewHolder(); convertView = View.inflate(mContext, R.layout.item_list, null); holder.iv_avatar = (ImageView) convertView .findViewById(R.id.iv_avatar); holder.tv_title = (TextView) convertView .findViewById(R.id.tv_title); holder.tv_content = (TextView) convertView .findViewById(R.id.tv_content); holder.gridview = (NoScrollGridView) convertView .findViewById(R.id.gridview); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } ItemEntity itemEntity = items.get(position); holder.tv_title.setText(itemEntity.getTitle()); holder.tv_content.setText(itemEntity.getContent()); // 使用ImageLoader加载网络图片 DisplayImageOptions options = new DisplayImageOptions.Builder()// .showImageOnLoading(R.drawable.ic_launcher) // 加载中显示的默认图片 .showImageOnFail(R.drawable.ic_launcher) // 设置加载失败的默认图片 .cacheInMemory(true) // 内存缓存 .cacheOnDisk(true) // sdcard缓存 .bitmapConfig(Config.RGB_565)// 设置最低配置 .build();// ImageLoader.getInstance().displayImage(itemEntity.getAvatar(), holder.iv_avatar, options); final ArrayList<String> imageUrls = itemEntity.getImageUrls(); if (imageUrls == null || imageUrls.size() == 0) { // 没有图片资源就隐藏GridView holder.gridview.setVisibility(View.GONE); } else { holder.gridview.setAdapter(new NoScrollGridAdapter(mContext, imageUrls)); } // 点击回帖九宫格,查看大图 holder.gridview.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub imageBrower(position, imageUrls); } }); return convertView; } /** * 打开图片查看器 * * @param position * @param urls2 */ protected void imageBrower(int position, ArrayList<String> urls2) { 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, urls2); intent.putExtra(ImagePagerActivity.EXTRA_IMAGE_INDEX, position); mContext.startActivity(intent); } /** * listview组件复用,防止“卡顿” * * @author Administrator * */ class ViewHolder { private ImageView iv_avatar; private TextView tv_title; private TextView tv_content; private NoScrollGridView gridview; } }
public class MyApplication extends Application { @Override public void onCreate() { super.onCreate(); DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder() // .showImageForEmptyUri(R.drawable.ic_launcher) // .showImageOnFail(R.drawable.ic_launcher) // .cacheInMemory(true) // .cacheOnDisk(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); } }
android:name="com.example.imagedemo.MyApplication"
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
...... @Override public View getView(int position, View convertView, ViewGroup parent) { View view = View.inflate(ctx, R.layout.item_gridview, null); ImageView imageView = (ImageView) view.findViewById(R.id.iv_image); DisplayImageOptions options = new DisplayImageOptions.Builder()// .cacheInMemory(true)// .cacheOnDisk(true)// .bitmapConfig(Config.RGB_565)// .build(); ImageLoader.getInstance().displayImage(imageUrls.get(position), imageView, options); return view; } ......
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <com.example.imagedemo.HackyViewPager android:id="@+id/pager" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/black" /> <TextView android:id="@+id/indicator" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" android:background="@android:color/transparent" android:gravity="center" android:text="@string/viewpager_indicator" android:textColor="@android:color/white" android:textSize="18sp" /> </FrameLayout>
public class HackyViewPager extends ViewPager { private static final String TAG = "HackyViewPager"; public HackyViewPager(Context context) { super(context); } public HackyViewPager(Context context, AttributeSet attrs) { super(context, attrs); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { try { return super.onInterceptTouchEvent(ev); } catch (IllegalArgumentException e) { // 不理会 Log.e(TAG, "hacky viewpager error1"); return false; } catch (ArrayIndexOutOfBoundsException e) { // 不理会 Log.e(TAG, "hacky viewpager error2"); return false; } } }
/** * 图片查看器 */ 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); ArrayList<String> urls = getIntent().getStringArrayListExtra( 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 ArrayList<String> fileList; public ImagePagerAdapter(FragmentManager fm, ArrayList<String> fileList) { super(fm); this.fileList = fileList; } @Override public int getCount() { return fileList == null ? 0 : fileList.size(); } @Override public Fragment getItem(int position) { String url = fileList.get(position); return ImageDetailFragment.newInstance(url); } } }
<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/black" > <ImageView android:id="@+id/image" android:layout_width="match_parent" android:layout_height="match_parent" android:adjustViewBounds="true" android:contentDescription="@string/app_name" android:scaleType="centerCrop" /> <ProgressBar android:id="@+id/loading" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:visibility="gone" /> </FrameLayout>
/** * 单张图片显示Fragment */ 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(); } }); } }
ImageView mImageView; PhotoViewAttacher mAttacher; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Any implementation of ImageView can be used! mImageView = (ImageView) findViewById(R.id.iv_photo); // Set the Drawable displayed Drawable bitmap = getResources().getDrawable(R.drawable.wallpaper); mImageView.setImageDrawable(bitmap); // Attach a PhotoViewAttacher, which takes care of all of the zooming functionality. mAttacher = new PhotoViewAttacher(mImageView); } // If you later call mImageView.setImageDrawable/setImageBitmap/setImageResource/etc then you just need to call attacher.update();
// These are set so we don't keep allocating them on the heap private final Matrix mBaseMatrix = new Matrix(); private final Matrix mDrawMatrix = new Matrix(); private final Matrix mSuppMatrix = new Matrix(); private final RectF mDisplayRect = new RectF(); private final float[] mMatrixValues = new float[9];
/** * Set's the ImageView's ScaleType to Matrix. */ private static void setImageViewScaleTypeMatrix(ImageView imageView) { /** * PhotoView sets it's own ScaleType to Matrix, then diverts all calls * setScaleType to this.setScaleType automatically. */ if (null != imageView && !(imageView instanceof IPhotoView)) { if (!ScaleType.MATRIX.equals(imageView.getScaleType())) { imageView.setScaleType(ScaleType.MATRIX); } } }
源码请在这里下载
http://blog.csdn.net/allen315410/article/details/40264551