許多應(yīng)用程序允許共享從圖庫中挑選的圖像。他們上傳原始圖片文件嗎？這是1-3 MB？或者他們處理？在任何情況下，我如何從文件路徑中獲取圖像，通過降低分辨率來減小其大小，并將其保存在其他地方并嘗試上傳？我試過了：Bitmap photo = decodeSampledBitmapFromFile(filePath, DESIRED_WIDTH, DESIRED_HEIGHT);FileOutputStream out = new FileOutputStream(filePath);photo.compress(Bitmap.CompressFormat.JPEG, 100, out);public static Bitmap decodeSampledBitmapFromFile(String path, int reqWidth, int reqHeight) { final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(path, options); final int height = options.outHeight; final int width = options.outWidth; options.inPreferredConfig = Bitmap.Config.ARGB_8888; int inSampleSize = 1; if (height > reqHeight) { inSampleSize = Math.round((float) height / (float) reqHeight); } int expectedWidth = width / inSampleSize; if (expectedWidth > reqWidth) { inSampleSize = Math.round((float) width / (float) reqWidth); } options.inSampleSize = inSampleSize; options.inJustDecodeBounds = false; return BitmapFactory.decodeFile(path, options);}但這是他們正確的方法嗎？因為我在這里看到了答案compression operation takes rather big amount of time
3 回答
鳳凰求蠱
TA貢獻1825條經(jīng)驗 獲得超4個贊
我使用此功能在上傳之前減小圖像的大小，它將圖像大小減小到接近200 KB并保持質(zhì)量相對較好，您可以通過更改REQUIRED_SIZE和inSampleSize來修改它以實現(xiàn)您的目的：
public File saveBitmapToFile(File file){
try {
// BitmapFactory options to downsize the image
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
o.inSampleSize = 6;
// factor of downsizing the image
FileInputStream inputStream = new FileInputStream(file);
//Bitmap selectedBitmap = null;
BitmapFactory.decodeStream(inputStream, null, o);
inputStream.close();
// The new size we want to scale to
final int REQUIRED_SIZE=75;
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while(o.outWidth / scale / 2 >= REQUIRED_SIZE &&
o.outHeight / scale / 2 >= REQUIRED_SIZE) {
scale *= 2;
}
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
inputStream = new FileInputStream(file);
Bitmap selectedBitmap = BitmapFactory.decodeStream(inputStream, null, o2);
inputStream.close();
// here i override the original image file
file.createNewFile();
FileOutputStream outputStream = new FileOutputStream(file);
selectedBitmap.compress(Bitmap.CompressFormat.JPEG, 100 , outputStream);
return file;
} catch (Exception e) {
return null;
}
}
注意：我在此函數(shù)中調(diào)整大小并覆蓋原始文件圖像，您也可以將其寫入另一個文件。
我希望它可以幫助你。
GCT1015
TA貢獻1827條經(jīng)驗 獲得超4個贊
這是我的解決方案
/*
* This procedure will replace the original image
* So you need to do a tmp copy to send before reduce
*/
public static boolean reduceImage(String path, long maxSize) {
File img = new File(path);
boolean result = false;
BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap bitmap = null;
options.inSampleSize=1;
while (img.length()>maxSize) {
options.inSampleSize = options.inSampleSize+1;
bitmap = BitmapFactory.decodeFile(path, options);
img.delete();
try
{
FileOutputStream fos = new FileOutputStream(path);
img.compress(path.toLowerCase().endsWith("png")?
Bitmap.CompressFormat.PNG:
Bitmap.CompressFormat.JPEG, 100, fos);
fos.close();
result = true;
}catch (Exception errVar) {
errVar.printStackTrace();
}
};
return result;
}
編輯刪除了其他程序調(diào)用
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