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。
Universal-Image-Loader初始化：
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();
}
加载图片：
@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;
}
缓存清理：
@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。
<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
保存图片至手机相册：
/**
* 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：
/**
* 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：
/**
* 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();
}
}
}