图片异步加载（带进度条）+二级缓存+图片手势缩放+ViewPaper+设置壁纸

功能：实现图片的加载（带进度条）、缓存、手势缩放、ViewPaper展示、设置壁纸等常用功能

 

效果图：

 

 

 

 主要实现：

 

 图片加载框架： Android-Universal-Image-Loader

 

 Android-Universal-Image-Loader是一个开源的UI组件程序，该项目的目的是提供一个可重复使用的仪器为异步图像加载，缓存和显示。

GITHUB上的下载路径为：https://github.com/nostra13/Android-Universal-Image-Loader 

 

 File cacheDir = StorageUtils.getOwnCacheDirectory(getApplicationContext(), "imageloader/Cache"); 
        //初始化Android-Universal-Image-Loader图片加载框架
        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(getApplicationContext())
        .diskCache(new UnlimitedDiscCache(cacheDir)) //自定义缓存路径  
        .denyCacheImageMultipleSizesInMemory()
        .diskCacheFileNameGenerator(new Md5FileNameGenerator())//将保存的时候的URI名称用MD5 加密 
        .tasksProcessingOrder(QueueProcessingType.LIFO)
        .writeDebugLogs() // Remove for release app
        .build();
        ImageLoader.getInstance().init(config);
 
private void initDisplayImageOptions() {
        disOptions = new DisplayImageOptions.Builder().showImageOnLoading(R.drawable.empty_photo) // 设置图片在下载期间显示的图片
                .showImageForEmptyUri(R.drawable.empty_photo)// 设置图片Uri为空或是错误的时候显示的图片
                .showImageOnFail(R.drawable.empty_photo) // 设置图片加载/解码过程中错误时候显示的图片
                .cacheInMemory(true)
                .cacheOnDisk(true)
                .considerExifParams(true)
                .bitmapConfig(Bitmap.Config.RGB_565)
                // .delayBeforeLoading(1000)//设置的下载前的延迟时间
                // .displayer(new RoundedBitmapDisplayer(20))//是否设置为圆角，弧度为多少
                .displayer(new FadeInBitmapDisplayer(100))// 是否图片加载好后渐入的动画时间
                .build();
    }

@Override
        public View getView(int index, View convertView, ViewGroup parent) {
            final GridHolder holder;
            if (convertView == null) {
                LayoutInflater layoutInflator = LayoutInflater.from(parent.getContext());
                convertView = layoutInflator.inflate(R.layout.grid_item, null);
                holder = new GridHolder();
                holder.appImage = (ImageView) convertView.findViewById(R.id.itemImage);
                holder.appName = (TextView) convertView.findViewById(R.id.itemText);
                holder.progressBar = (ProgressBar) convertView.findViewById(R.id.progress);
                convertView.setTag(holder);
            } else {
                holder = (GridHolder) convertView.getTag();
            }
            GridInfo info = list.get(index);
            if (info != null) {
                holder.appName.setText(info.getName());
                // imageLoader.displayImage(info.getPicUrl(),
                // holder.appImage,disOptions);
                imageLoader.displayImage(info.getPicUrl(), holder.appImage, disOptions, new SimpleImageLoadingListener() {
                    @Override
                    public void onLoadingStarted(String imageUri, View view) {
                        holder.progressBar.setProgress(0);
                        holder.progressBar.setVisibility(View.VISIBLE);
                    }
                    @Override
                    public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
                        // TODO Auto-generated method stub
                        holder.progressBar.setVisibility(View.GONE);
                    }
                    @Override
                    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
                        holder.progressBar.setVisibility(View.GONE);
                    }
                }, new ImageLoadingProgressListener() {
                    @Override
                    public void onProgressUpdate(String imageUri, View view, int current, int total) {
                        holder.progressBar.setProgress(Math.round(100.0f * current / total));
                    }
                });
            }
            return convertView;
        }

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.item_clear_memory_cache:
            imageLoader.clearMemoryCache();//清除内存中的缓存
            return true;
        case R.id.item_clear_disc_cache:
            imageLoader.clearDiskCache();//清除SD卡中的缓存
            return true;
        default:
            return false;
    }
}

String imageUri = "http://site.com/image.png"; // from Web
String imageUri = "file:///mnt/sdcard/image.png"; // from SD card
String imageUri = "content://media/external/audio/albumart/13"; // from content provider
String imageUri = "assets://image.png"; // from assets
String imageUri = "drawable://" + R.drawable.image; // from drawables

---

图片手势缩放框架：GestureImageView

单图浏览插件，支持图片多点缩放，支持图片拖动，开放单击和双击事件，点击事件与触摸事件不冲突。

GestureImageView使用和配置是非常简单的。入手非常容易。

GITHUB上的下载路径为：https://github.com/jasonpolites/gesture-imageview

<com.polites.android.GestureImageView
        android:id="@+id/image"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:scaleType="centerCrop"
        gesture-image:max-scale="10.0"
        gesture-image:min-scale="0.7" 
        gesture-image:strict="false" />

gesture-image:min-scale 缩放最小值
gesture-image:max-scale 缩放最大值
gesture-image:strict  是否精确

/**
     * 保存图片
     */
    private void savePic() {
        showShortToast("保存至手机相册");
        MediaStore.Images.Media.insertImage(getContentResolver(), bitmapPic, "", "");
        sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + SD_PATH)));
    }

/**
 * 分享图片
 */
private void sharePic() {
    Intent sintent = new Intent(Intent.ACTION_SEND);
    sintent.setType("image/*");
    File shareFile = new File(SD_PATH, "share.jpg");
    try {
        shareFile.createNewFile();
        saveBitmapFile(bitmapPic, shareFile);
    } catch (IOException e) {
        e.printStackTrace();
    }
    saveBitmapFile(bitmapPic, shareFile);
    Uri u = Uri.fromFile(shareFile);
    sintent.putExtra(Intent.EXTRA_STREAM, u);
    startActivity(Intent.createChooser(sintent, "分享图片"));
     
}

/**
    * 设置壁纸
    */
   private void setWallpaper() {
        wallpaperFile = new File(SD_PATH, "wallpaper.jpg");
        try {
            if (!wallpaperFile.exists()) {
                wallpaperFile.createNewFile();
            }
            saveBitmapFile(bitmapPic, wallpaperFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Intent intent = new Intent("com.android.camera.action.CROP");
        int width =  WallpaperManager.getInstance(this).getDesiredMinimumWidth();
        int height =  WallpaperManager.getInstance(this).getDesiredMinimumHeight();
        intent.setDataAndType(Uri.parse("file://" + wallpaperFile.getPath()), "image/*");
        intent.putExtra("crop", "true");
        intent.putExtra("outputX", width);
        intent.putExtra("outputY", height);
        intent.putExtra("aspectX", width);
        intent.putExtra("aspectY", height);
        intent.putExtra("scale", true);
        intent.putExtra("scaleUpIfNeeded", true);
        intent.putExtra("noFaceDetection", true);
        intent.putExtra("output", Uri.parse("file://" + wallpaperFile.getPath()));
        intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.name());
        startActivityForResult(intent, SET_WALLPAPER);
         
    }
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       if (requestCode == SET_WALLPAPER &&resultCode!=0&& data != null) {
            WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
            try {
                wallpaperManager
                        .setBitmap(BitmapFactory.decodeFile(wallpaperFile.getAbsolutePath()));
                showShortToast("设置壁纸成功");
            } catch (IOException e) {
                showShortToast("设置壁纸失败");
                e.printStackTrace();
            }
        }
    }