使用Android压缩像Whatsapp和Facebook这样的图像
我已经试过用这段代码来转换使用Android压缩像Whatsapp和Facebook这样的图像,android,image,facebook,compression,whatsapp,Android,Image,Facebook,Compression,Whatsapp,我已经试过用这段代码来转换图像对于标题位大小来说效果不错,但是我想调整图像动态的大小,比如Whatsapp和Facebook。 在Whatsapp4到5 MB中,图像被压缩到KB中,那么我该怎么做呢 public String compressImage(String imageUri) { String filePath = getRealPathFromURI(imageUri); Bitmap scaledBitmap = null; BitmapFactor
图像
对于标题位大小来说效果不错,但是我想调整图像动态的大小,比如Whatsapp和Facebook。
在Whatsapp
4
到5 MB
中,图像被压缩到KB
中,那么我该怎么做呢
public String compressImage(String imageUri) {
String filePath = getRealPathFromURI(imageUri);
Bitmap scaledBitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
float maxHeight = 816.0f;
float maxWidth = 612.0f;
float imgRatio = actualWidth / actualHeight;
float maxRatio = maxWidth / maxHeight;
if (actualHeight > maxHeight || actualWidth > maxWidth) {
if (imgRatio < maxRatio) { imgRatio = maxHeight / actualHeight; actualWidth = (int) (imgRatio * actualWidth); actualHeight = (int) maxHeight; } else if (imgRatio > maxRatio) {
imgRatio = maxWidth / actualWidth;
actualHeight = (int) (imgRatio * actualHeight);
actualWidth = (int) maxWidth;
} else {
actualHeight = (int) maxHeight;
actualWidth = (int) maxWidth;
}
}
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try {
bmp = BitmapFactory.decodeFile(filePath, options);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight,Bitmap.Config.ARGB_8888);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
float middleX = actualWidth / 2.0f;
float middleY = actualHeight / 2.0f;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, middleX, middleY);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, middleX - bmp.getWidth() / 2, middleY - bmp.getHeight() / 2, new Paint(Paint.FILTER_BITMAP_FLAG));
ExifInterface exif;
try {
exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION, 0);
Log.d("EXIF", "Exif: " + orientation);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 3) {
matrix.postRotate(180);
Log.d("EXIF", "Exif: " + orientation);
} else if (orientation == 8) {
matrix.postRotate(270);
Log.d("EXIF", "Exif: " + orientation);
}
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
scaledBitmap.getWidth(), scaledBitmap.getHeight(), matrix,
true);
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream out = null;
String filename = getFilename();
try {
out = new FileOutputStream(filename);
scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return filename;
}
public String getFilename() {
File file = new File(Environment.getExternalStorageDirectory().getPath(), "MyFolder/Images");
if (!file.exists()) {
file.mkdirs();
}
String uriSting = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".jpg");
return uriSting;
}
private String getRealPathFromURI(String contentURI) {
Uri contentUri = Uri.parse(contentURI);
Cursor cursor = getContentResolver().query(contentUri, null, null, null, null);
if (cursor == null) {
return contentUri.getPath();
} else {
cursor.moveToFirst();
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
return cursor.getString(index);
}
}
public int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int heightRatio = Math.round((float) height/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio; } final float totalPixels = width * height; final float totalReqPixelsCap = reqWidth * reqHeight * 2; while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
inSampleSize++;
}
return inSampleSize;
}
公共字符串压缩图像(字符串图像URI){
字符串filePath=getRealPathFromURI(imageUri);
位图缩放位图=空;
BitmapFactory.Options=new-BitmapFactory.Options();
options.inJustDecodeBounds=true;
位图bmp=BitmapFactory.decodeFile(文件路径,选项);
int实际高度=options.outHeight;
int actualWidth=options.outWidth;
浮动最大高度=816.0f;
浮动最大宽度=612.0f;
浮动高度=实际宽度/实际高度;
浮点最大比值=最大宽度/最大高度;
如果(实际高度>最大高度| |实际宽度>最大宽度){
if(imgRatiomaxRatio){
imgRatio=最大宽度/实际宽度;
实际高度=(int)(imgRatio*实际高度);
实际宽度=(int)最大宽度;
}否则{
实际高度=(int)最大高度;
实际宽度=(int)最大宽度;
}
}
options.inSampleSize=calculateInSampleSize(选项、实际宽度、实际高度);
options.inpurgable=true;
options.inInputShareable=true;
options.inTempStorage=新字节[16*1024];
试一试{
bmp=BitmapFactory.decodeFile(文件路径,选项);
}捕获(OutOfMemoryError异常){
异常。printStackTrace();
}
试一试{
scaledbimat=Bitmap.createBitmap(实际宽度、实际高度、Bitmap.Config.ARGB_8888);
}捕获(OutOfMemoryError异常){
异常。printStackTrace();
}
浮动比率=实际宽度/(浮动)选项。向外宽度;
浮动比率=实际高度/(浮动)选项。超出高度;
浮动中间点x=实际宽度/2.0f;
浮动中间Y=实际高度/2.0f;
矩阵scaleMatrix=新矩阵();
scaleMatrix.setScale(ratioX、ratioY、middleX、middleY);
画布画布=新画布(缩放位图);
canvas.setMatrix(scaleMatrix);
drawBitmap(bmp,middleX-bmp.getWidth()/2,middleY-bmp.getHeight()/2,新绘制(Paint.FILTER_位图_标志));
出口接口;
试一试{
exif=新的ExifInterface(文件路径);
int-orientation=exif.getAttributeInt(
ExiFinInterface.TAG_方向,0);
Log.d(“EXIF”,“EXIF:+方向”);
矩阵=新矩阵();
如果(方向==6){
矩阵旋转后(90);
Log.d(“EXIF”,“EXIF:+方向”);
}否则如果(方向==3){
矩阵旋转后(180);
Log.d(“EXIF”,“EXIF:+方向”);
}否则如果(方向==8){
矩阵旋转后(270);
Log.d(“EXIF”,“EXIF:+方向”);
}
scaledBitmap=Bitmap.createBitmap(scaledBitmap,0,0,
scaledBitmap.getWidth(),scaledBitmap.getHeight(),矩阵,
正确的);
}捕获(IOE异常){
e、 printStackTrace();
}
FileOutputStream out=null;
字符串filename=getFilename();
试一试{
out=新文件输出流(文件名);
scaledBitmap.compress(Bitmap.CompressFormat.JPEG,80,out);
}catch(filenotfounde异常){
e、 printStackTrace();
}
返回文件名;
}
公共字符串getFilename(){
File File=新文件(Environment.getExternalStorageDirectory().getPath(),“MyFolder/Images”);
如果(!file.exists()){
mkdirs()文件;
}
字符串uriSting=(file.getAbsolutePath()+“/”+System.currentTimeMillis()+”.jpg”);
回归分析;
}
私有字符串getRealPathFromURI(字符串contentURI){
uricontenturi=Uri.parse(contentUri);
Cursor Cursor=getContentResolver().query(contentUri,null,null,null);
if(游标==null){
返回contentUri.getPath();
}否则{
cursor.moveToFirst();
int index=cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
返回cursor.getString(索引);
}
}
公共int-calculateInSampleSize(BitmapFactory.Options选项、int-reqWidth、int-reqHeight){
最终内部高度=options.outHeight;
最终整数宽度=options.outWidth;
int inSampleSize=1;
如果(高度>要求高度| |宽度>要求宽度){
最终内部高度比=数学圆((浮动)高度/(浮动)要求高度);
最终整数宽度比=数学圆((浮动)宽度/(浮动)宽度);
inSampleSize=heightRatiototalReqPixelsCap){
inSampleSize++;
}
返回样本大小;
}
此代码用于转换图像,但在我的项目要求中是这样的。- 对于裁剪图像,可以使用以下命令
- 对于压缩图像,您也可以使用此代码
public Bitmap decodeFile(String filePath) { BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeFile(filePath, o); // The new size we want to scale to final int REQUIRED_SIZE = 1024; // Find the correct scale value. It should be the power of 2. int width_tmp = o.outWidth, height_tmp = o.outHeight; int scale = 1; while (true) { if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE) break; width_tmp /= 2; height_tmp /= 2; scale *= 2; } // Decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize = scale; Bitmap image = BitmapFactory.decodeFile(filePath, o2); ExifInterface exif; try { exif = new ExifInterface(filePath); int exifOrientation = exif.getAttributeInt( ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); int rotate = 0; switch (exifOrientation) { case ExifInterface.ORIENTATION_ROTATE_90: rotate = 90; break; case ExifInterface.ORIENTATION_ROTATE_180: rotate = 180; break; case ExifInterface.ORIENTATION_ROTATE_270: rotate = 270; break; } if (rotate != 0) { int w = image.getWidth(); int h = image.getHeight(); // Setting pre rotate Matrix mtx = new Matrix(); mtx.preRotate(rotate); // Rotating Bitmap & convert to ARGB_8888, required by tess image = Bitmap.createBitmap(image, 0, 0, w, h, mtx, false); } } catch (IOException e) { return null; } return image.copy(Bitmap.Config.ARGB_8888, true); }
公共位图解码文件(字符串文件路径){ BitmapFactory.Options o=新的BitmapFactory.Options(); o、 inJustDecodeBounds=true; 解码文件(文件路径,o); //我们要扩展到的新尺寸 所需的最终int_SIZE=1024; //找到正确的刻度值。它应该是2的幂。 内部宽度=o.向外宽度,高度=o.向外高度; int标度=1; while(true){ 如果(宽度\u tmp<要求的\u尺寸和高度\u tmp<要求的\u尺寸) 打破 宽度_tmp/=2; 高度_tmp/=2; 比例*=2; } //用inSampleSize解码 BitmapFactory.Options o2=新的BitmapFactory.Options(); o2.inSampleSize=刻度; 位图图像=BitmapFactory.decod