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Foreword
Encountered in the project, required users to upload pictures scene. The results uploaded by the user, especially after you take a picture, great resolution, length and width of more than 2000 3000 or even higher, a picture 5MB or more. After the result, load these images from the Internet, slow.
So, after we had to be compressed before uploading, then upload.
FileUtils file write
/**
* desc :
* author : stone
* email : [email protected]
* time : 2019/5/29 9:19
*/
public class FileUtils {
//获取指定文件目录的内部文件(路径)
public static File getAlbumStorageDir(Context context, String directory) {
File file;
//有sdcard
if (TextUtils.equals(Environment.getExternalStorageState(), Environment.MEDIA_MOUNTED)) {
file = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), directory);
} else {
file = new File(context.getCacheDir(), directory);
}
if (!file.mkdirs()) {
LogUtils.e("ExtensionSignActivity", "Directory not created");
}
return file;
}
//保存 jpg/png的 Bitmap
public static String saveBmp2Local(Context context, Bitmap bmp, String picName, boolean isPng) {
// 声明文件对象
File file = null;
// 声明输出流
FileOutputStream outStream = null;
try {
file = new File(getAlbumStorageDir(context, LFConfig.IMG_DIRECTORY_NAME), picName + (isPng ? ".png" : ".jpg"));
// 获得输出流，如果文件中有内容，追加内容
outStream = new FileOutputStream(file);
bmp.compress(isPng ? Bitmap.CompressFormat.PNG : Bitmap.CompressFormat.JPEG, 90, outStream);
} catch (Exception e) {
e.getStackTrace();
} finally {
try {
if (outStream != null) {
outStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
if (file != null) {
return file.getPath();
}
return null;
}
//保存gif。使用nio写入
public static String saveGif2Local(Context context, ByteBuffer byteBuffer, String picName) throws FileNotFoundException {
// 声明文件对象
File file = null;
// 声明输出流
FileOutputStream outStream = null;
FileChannel channel = null;
try {
file = new File(getAlbumStorageDir(context, LFConfig.IMG_DIRECTORY_NAME), picName + ".gif");
// 获得输出流，如果文件中有内容，追加内容
outStream = new FileOutputStream(file);
channel = outStream.getChannel();
//不能确定channel.write()能一次性写入buffer的所有数据
//所以通过判断是否有余留循环写入
while (byteBuffer.hasRemaining()) {
channel.write(byteBuffer);
}
} catch (Exception e) {
e.getStackTrace();
} finally {
try {
if (outStream != null) {
outStream.close();
}
if (channel != null) {
channel.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
if (file != null) {
return file.getPath();
}
return null;
}
public static void deleteTempImages(Context context) {
com.blankj.utilcode.util.FileUtils.deleteDir(getAlbumStorageDir(context, LFConfig.IMG_DIRECTORY_NAME));
}
}
Glide loaded and compression
Combined rxjava # Obserable, in the sub-thread, to make image path map transformation.
Bitmap or GifDrawable transformed into a glide Load picture.
Once subscribed, compressed and stored locally.
About gif compression, yet to consider.
/**
* 存储到本地
* @param item 原始图片路径
*/
private void compressAndSaveItem(final String item) {
String[] strArray = item.split("\\.");
if (strArray.length > 0 && strArray[strArray.length - 1].toLowerCase().equals("gif")) {//判断后缀名是否是gif
Observable.just(item)
.observeOn(Schedulers.io()) //整体运行行在子线程
.compose(RxJavaUtil.rxLife(PublishProductActivity.this)) //结合了rxlifecycle库
.map(s -> GlideApp.with(PublishProductActivity.this)
.asGif()
.load(s)
.fitCenter()
.submit()//原始分辨率
// .submit(720, 1080) //自定义分辨率
.get())
.subscribe(result -> {
int pointIndex = item.lastIndexOf(".");
int nameStartIndex = item.lastIndexOf("/") + 1;
int end;
if (pointIndex < nameStartIndex) {
end = item.length();
} else {
end = pointIndex;
}
String fileName = item.substring(nameStartIndex, end);
String path = FileUtils.saveGif2Local(PublishProductActivity.this,
result.getBuffer(), fileName + "_copy");
/*
* 有了保存的压缩图片路径 path
* do other thing
*/
}, error -> {
error.printStackTrace();
});
} else {
Observable.just(item)
.observeOn(Schedulers.io())//整体运行行在子线程
.compose(RxJavaUtil.rxLife(PublishProductActivity.this)) //结合了rxlifecycle库
.map(s -> GlideApp.with(PublishProductActivity.this)
.asBitmap()
.load(s)
.fitCenter()
.submit()//原始分辨率
// .submit(720, 1080) //自定义分辨率
.get())
.subscribe(result -> {
int pointIndex = item.lastIndexOf(".");
int nameStartIndex = item.lastIndexOf("/") + 1;
int end;
if (pointIndex < nameStartIndex) {
end = item.length();
} else {
end = pointIndex;
}
String fileName = item.substring(nameStartIndex, end);
//缩放bitmap都为原宽高的1/2
Bitmap scaleBitmap = Bitmap.createScaledBitmap(result,
result.getWidth() / 2, result.getHeight() / 2, true);
String path = FileUtils.saveBmp2Local(PublishProductActivity.this, scaleBitmap
, fileName + "_copy",
strArray[strArray.length - 1].toLowerCase().equals("png"));
/*
* 有了保存的压缩图片路径 path
* do other thing
*/
}, error -> {
error.printStackTrace();
});
}
We encountered a problem gif image does not show
Too pit, GifDrawable # getBuffer (), with preservation of nio logic is no problem. The resulting image after saving enough to show, looks like possibly the Glide bug, can only be removed gif related code, do not use glide deal.
