Android 图片保存压缩uri，bitmap，file互转（
2022-06-29 本文已影响0人
wenju
import android.content.ContentResolver;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ImageDecoder;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.text.TextUtils;
import android.text.format.DateFormat;
import android.util.Log;
import androidx.annotation.Nullable;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
public class BitmapUtil {
private BitmapUtil() {
throw new UnsupportedOperationException("u can't instantiate me...");
}
static Bitmap getScaledBitmap(Context context, Uri imageUri, float maxWidth, float maxHeight, Bitmap.Config bitmapConfig) {
String filePath = FileUtil.getRealPathFromURI(context, imageUri);
Bitmap scaledBitmap = null;
BitmapFactory.Options options = new BitmapFactory.Options();
//by setting this field as true, the actual bitmap pixels are not loaded in the memory. Just the bounds are loaded. If
//you try the use the bitmap here, you will get null.
options.inJustDecodeBounds = true;
Bitmap bmp = BitmapFactory.decodeFile(filePath, options);
if (bmp == null) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
BitmapFactory.decodeStream(inputStream, null, options);
inputStream.close();
} catch (FileNotFoundException exception) {
exception.printStackTrace();
} catch (IOException exception) {
exception.printStackTrace();
}
}
int actualHeight = options.outHeight;
int actualWidth = options.outWidth;
if (actualHeight == -1 || actualWidth == -1){
try {
ExifInterface exifInterface = new ExifInterface(filePath);
actualHeight = exifInterface.getAttributeInt(ExifInterface.TAG_IMAGE_LENGTH, ExifInterface.ORIENTATION_NORMAL);//获取图片的高度
actualWidth = exifInterface.getAttributeInt(ExifInterface.TAG_IMAGE_WIDTH, ExifInterface.ORIENTATION_NORMAL);//获取图片的宽度
} catch (IOException e) {
e.printStackTrace();
}
}
if (actualWidth <= 0 || actualHeight <= 0) {
Bitmap bitmap2 = BitmapFactory.decodeFile(filePath);
if (bitmap2 != null){
actualWidth = bitmap2.getWidth();
actualHeight = bitmap2.getHeight();
}else{
return null;
}
}
float imgRatio = (float) actualWidth / actualHeight;
float maxRatio = maxWidth / maxHeight;
//width and height values are set maintaining the aspect ratio of the image
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;
}
}
//setting inSampleSize value allows to load a scaled down version of the original image
options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight);
//inJustDecodeBounds set to false to load the actual bitmap
options.inJustDecodeBounds = false;
//this options allow android to claim the bitmap memory if it runs low on memory
options.inPurgeable = true;
options.inInputShareable = true;
options.inTempStorage = new byte[16 * 1024];
try {
// load the bitmap getTempFile its path
bmp = BitmapFactory.decodeFile(filePath, options);
if (bmp == null) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
BitmapFactory.decodeStream(inputStream, null, options);
inputStream.close();
} catch (IOException exception) {
exception.printStackTrace();
}
}
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
if (actualHeight <= 0 || actualWidth <= 0){
return null;
}
try {
scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, bitmapConfig);
} catch (OutOfMemoryError exception) {
exception.printStackTrace();
}
float ratioX = actualWidth / (float) options.outWidth;
float ratioY = actualHeight / (float) options.outHeight;
Matrix scaleMatrix = new Matrix();
scaleMatrix.setScale(ratioX, ratioY, 0, 0);
Canvas canvas = new Canvas(scaledBitmap);
canvas.setMatrix(scaleMatrix);
canvas.drawBitmap(bmp, 0, 0, new Paint(Paint.FILTER_BITMAP_FLAG));
// 采用 ExitInterface 设置图片旋转方向
ExifInterface exif;
try {
exif = new ExifInterface(filePath);
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 0);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
scaledBitmap = Bitmap.createBitmap(scaledBitmap, 0, 0,
scaledBitmap.getWidth(), scaledBitmap.getHeight(),
matrix, true);
} catch (IOException e) {
e.printStackTrace();
}
return scaledBitmap;
}
static File compressImage(Context context, Uri imageUri, float maxWidth, float maxHeight,
Bitmap.CompressFormat compressFormat, Bitmap.Config bitmapConfig,
int quality, String parentPath, String prefix, String fileName) {
FileOutputStream out = null;
String filename = generateFilePath(context, parentPath, imageUri, compressFormat.name().toLowerCase(), prefix, fileName);
try {
out = new FileOutputStream(filename);
// 通过文件名写入
Bitmap newBmp = BitmapUtil.getScaledBitmap(context, imageUri, maxWidth, maxHeight, bitmapConfig);
if (newBmp != null){
newBmp.compress(compressFormat, quality, out);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException ignored) {
}
}
return new File(filename);
}
private static String generateFilePath(Context context, String parentPath, Uri uri,
String extension, String prefix, String fileName) {
File file = new File(parentPath);
if (!file.exists()) {
file.mkdirs();
}
/** if prefix is null, set prefix "" */
prefix = TextUtils.isEmpty(prefix) ? "" : prefix;
/** reset fileName by prefix and custom file name */
fileName = TextUtils.isEmpty(fileName) ? prefix + FileUtil.splitFileName(FileUtil.getFileName(context, uri))[0] : fileName;
return file.getAbsolutePath() + File.separator + fileName + "." + extension;
}
/**
* 计算inSampleSize
*/
private static 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;
}
public static File getFileSavedBitmap(Bitmap bitmap,Context context){
if (bitmap == null || context == null ) {
return null;
}
File temFileDir = getDiskCacheDir(context);//存储目录 缓存目录
// File directory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File file = new File(temFileDir, getFileName());//将要保存图片的路径
// File file = new File(directory, getFileName());//将要保存图片的路径
try {
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
bos.flush();
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
/**
* 获取缓存目录 一般存放临时缓存数据
* getCacheDir:/data/data/<application package>/cache目录(手机内存中)
* getExternalCacheDir:用于获取SDCard/Android/data/你的应用包名/cache/目录
*/
public static File getDiskCacheDir(Context context) {
File cachePath;
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
|| !Environment.isExternalStorageRemovable()) {
cachePath = context.getExternalCacheDir();
} else {
cachePath = context.getCacheDir();
}
return cachePath;
}
private static String getFileName() {
long currentTimeMillis = System.currentTimeMillis();
CharSequence format = DateFormat.format("yyyyMMdd_hhmmss", currentTimeMillis);
String value = String.valueOf(currentTimeMillis);
String name = format + "_" + value.substring(value.length() - 4, value.length());
return name + ".png";
}
/**
* 从文件读取Bitmap
*
* @param dst 目标路径
* @param processOrientation 是否处理图片旋转角度
* @return
*/
public static Bitmap getBitmapFromFile(File dst, boolean processOrientation) {
if (null != dst && dst.exists()) {
try {
Bitmap bitmap = BitmapFactory.decodeFile(dst.getPath());
if (!processOrientation) {
return bitmap;
}
int orientation = getOrientation(dst.getPath());
if (orientation == 0) {
return bitmap;
} else {
Matrix matrix = new Matrix();
matrix.postRotate(orientation);
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
}
} catch (OutOfMemoryError e) {
e.printStackTrace();
}
}
return null;
}
/**
* 获取图片旋转角度
*
* @param path 根据路径
*/
public static int getOrientation(final String path) {
int rotation = 0;
try {
File file = new File(path);
ExifInterface exif = new ExifInterface(file.getAbsolutePath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
rotation = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotation = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
rotation = 270;
break;
default:
rotation = 0;
break;
}
} catch (Exception e) {
e.printStackTrace();
}
return rotation;
}
/**
* 获取到的是真实的bitmap,如果能旋转就旋转
* @param resolver
* @param uri
* @return 返回旋转后的照片
*/
@Nullable
public static Bitmap decodeImage(ContentResolver resolver, Uri uri) {
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
/**
* 注意！！！
* 通过此方法得到的bitmap无法使用getPixel()方法
* java.lang.IllegalStateException: unable to getPixel(), pixel access is not supported on Config#HARDWARE bitmaps
* 默认返回的是硬件HARDWARE内存中的bitmap，速度快，高效，但是无法使用getPixel()方法
*/
return ImageDecoder.decodeBitmap(ImageDecoder.createSource(resolver, uri));
} else {
return decodeImageLegacy(resolver, uri);
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 获取真实的bitmap，返回的是处理过rotate的bitmap
* @param resolver
* @param uri
* @return
*/
@Nullable
private static Bitmap decodeImageLegacy(ContentResolver resolver, Uri uri) {
Bitmap bitmap = null;
InputStream inputStream = null;
try {
inputStream = resolver.openInputStream(uri);
bitmap = BitmapFactory.decodeStream(inputStream);
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
if (bitmap == null) {
return null;
}
inputStream = null;
int orientation = androidx.exifinterface.media.ExifInterface.ORIENTATION_NORMAL;
try {
inputStream = resolver.openInputStream(uri);
if (inputStream != null) {
androidx.exifinterface.media.ExifInterface exifInterface = new androidx.exifinterface.media.ExifInterface(inputStream);
orientation = exifInterface.getAttributeInt(androidx.exifinterface.media.ExifInterface.TAG_ORIENTATION, androidx.exifinterface.media.ExifInterface.ORIENTATION_NORMAL);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Log.d("EXIF", "Exif: " + orientation);
if (orientation == androidx.exifinterface.media.ExifInterface.ORIENTATION_NORMAL) {
return bitmap;
} else {
Matrix matrix = new Matrix();
if (orientation == androidx.exifinterface.media.ExifInterface.ORIENTATION_ROTATE_90) {
matrix.postRotate(90);
} else if (orientation == androidx.exifinterface.media.ExifInterface.ORIENTATION_ROTATE_180) {
matrix.postRotate(180);
} else if (orientation == androidx.exifinterface.media.ExifInterface.ORIENTATION_ROTATE_270) {
matrix.postRotate(270);
}
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
}
}
}
import android.annotation.SuppressLint;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.provider.OpenableColumns;
import android.text.TextUtils;
import android.util.Log;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
public class FileUtil {
static final String FILES_PATH = "CompressHelper";
private static final int EOF = -1;
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
private FileUtil() {
throw new UnsupportedOperationException("u can't instantiate me...");
}
/**
* 根据文件路径获取文件
*
* @param filePath 文件路径
* @return 文件
*/
public static File getFileByPath(String filePath) {
return TextUtils.isEmpty(filePath) ? null : new File(filePath);
}
/**
* 判断文件是否存在
*
* @param filePath 文件路径
* @return {@code true}: 存在<br>{@code false}: 不存在
*/
public static boolean isFileExists(String filePath) {
return isFileExists(getFileByPath(filePath));
}
/**
* 判断文件是否存在
*
* @param file 文件
* @return {@code true}: 存在<br>{@code false}: 不存在
*/
public static boolean isFileExists(File file) {
return file != null && file.exists();
}
/**
* 重命名文件
*
* @param filePath 文件路径
* @param newName 新名称
* @return {@code true}: 重命名成功<br>{@code false}: 重命名失败
*/
public static boolean rename(String filePath, String newName) {
return rename(getFileByPath(filePath), newName);
}
/**
* 重命名文件
*
* @param file 文件
* @param newName 新名称
* @return {@code true}: 重命名成功<br>{@code false}: 重命名失败
*/
public static boolean rename(File file, String newName) {
// 文件为空返回false
if (file == null) return false;
// 文件不存在返回false
if (!file.exists()) return false;
// 新的文件名为空返回false
if (TextUtils.isEmpty(newName)) return false;
// 如果文件名没有改变返回true
if (newName.equals(file.getName())) return true;
File newFile = new File(file.getParent() + File.separator + newName);
// 如果重命名的文件已存在返回false
return !newFile.exists()
&& file.renameTo(newFile);
}
/**
* 判断是否是目录
*
* @param dirPath 目录路径
* @return {@code true}: 是<br>{@code false}: 否
*/
public static boolean isDir(String dirPath) {
return isDir(getFileByPath(dirPath));
}
/**
* 判断是否是目录
*
* @param file 文件
* @return {@code true}: 是<br>{@code false}: 否
*/
public static boolean isDir(File file) {
return isFileExists(file) && file.isDirectory();
}
/**
* 判断是否是文件
*
* @param filePath 文件路径
* @return {@code true}: 是<br>{@code false}: 否
*/
public static boolean isFile(String filePath) {
return isFile(getFileByPath(filePath));
}
/**
* 判断是否是文件
*
* @param file 文件
* @return {@code true}: 是<br>{@code false}: 否
*/
public static boolean isFile(File file) {
return isFileExists(file) && file.isFile();
}
/**
* 重命名文件
* @param file 文件
* @param newName 新名字
* @return 新文件
*/
public static File renameFile(File file, String newName) {
File newFile = new File(file.getParent(), newName);
if (!newFile.equals(file)) {
if (newFile.exists()) {
if (newFile.delete()) {
Log.d("FileUtil", "Delete old " + newName + " file");
}
}
if (file.renameTo(newFile)) {
Log.d("FileUtil", "Rename file to " + newName);
}
}
return newFile;
}
/**
* 获取临时文件
* @param context 上下文
* @param uri url
* @return 临时文件
* @throws IOException
*/
public static File getTempFile(Context context, Uri uri) throws IOException {
InputStream inputStream = context.getContentResolver().openInputStream(uri);
String fileName = getFileName(context, uri);
String[] splitName = splitFileName(fileName);
File tempFile = File.createTempFile(splitName[0], splitName[1]);
tempFile = renameFile(tempFile, fileName);
tempFile.deleteOnExit();
FileOutputStream out = null;
try {
out = new FileOutputStream(tempFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if (inputStream != null) {
copy(inputStream, out);
inputStream.close();
}
if (out != null) {
out.close();
}
return tempFile;
}
/**
* 截取文件名称
* @param fileName 文件名称
*/
static String[] splitFileName(String fileName) {
String name = fileName;
String extension = "";
int i = fileName.lastIndexOf(".");
if (i != -1) {
name = fileName.substring(0, i);
extension = fileName.substring(i);
}
return new String[]{name, extension};
}
/**
* 获取文件名称
* @param context 上下文
* @param uri uri
* @return 文件名称
*/
@SuppressLint("Range")
static String getFileName(Context context, Uri uri) {
String result = null;
if (uri.getScheme().equals("content")) {
Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
try {
if (cursor != null && cursor.moveToFirst()) {
result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (cursor != null) {
cursor.close();
}
}
}
if (result == null) {
result = uri.getPath();
int cut = result.lastIndexOf(File.separator);
if (cut != -1) {
result = result.substring(cut + 1);
}
}
return result;
}
/**
* 获取真实的路径
* @param context 上下文
* @param uri uri
* @return 文件路径
*/
static String getRealPathFromURI(Context context, Uri uri) {
Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
if (cursor == null) {
return uri.getPath();
} else {
cursor.moveToFirst();
int index = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
String realPath = cursor.getString(index);
cursor.close();
return realPath;
}
}
static int copy(InputStream input, OutputStream output) throws IOException {
long count = copyLarge(input, output);
if (count > Integer.MAX_VALUE) {
return -1;
}
return (int) count;
}
static long copyLarge(InputStream input, OutputStream output)
throws IOException {
return copyLarge(input, output, new byte[DEFAULT_BUFFER_SIZE]);
}
static long copyLarge(InputStream input, OutputStream output, byte[] buffer)
throws IOException {
long count = 0;
int n;
while (EOF != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
public static String getReadableFileSize(long size) {
if (size <= 0) {
return "0";
}
final String[] units = new String[]{"B", "KB", "MB", "GB", "TB"};
int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + " " + units[digitGroups];
}
}
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
public class ImageCompressionUtils {
/**
* 得到byte[]
* LeanCloud上传文件是需要byte[]数组的
* 这里对传入的图片Uri压缩，并转换为byte[]后返回
*
* @param activity 上下文
* @param uri 传入图片的Uri
* @return byte[]
*/
public static byte[] getCompressionImageByte(Activity activity, Uri uri) throws IOException {
//先进行尺寸压缩
// Bitmap bitmap = getCompressionBitmapFormUri(activity, uri);
Bitmap bitmap = BitmapFactory.decodeStream(activity.getContentResolver().openInputStream(uri));
//再进行质量压缩
ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);//100表示不压缩，直接放到out里面
int options = 90;//压缩比例
while (out.toByteArray().length / 1024 > 800) { // 循环判断如果压缩后图片是否大于800kb,大于继续压缩
out.reset(); // 重置baos即清空baos
bitmap.compress(Bitmap.CompressFormat.JPEG, options, out);// 这里压缩options%，把压缩后的数据存放到baos中
options -= 10;// 每次都减少10
}
Log.e("压缩-提交", out.toByteArray().length + "");
byte[] bs = out.toByteArray();//转换为byte提交
return bs;
}
public static byte[] getCompressionImageByte(Bitmap bitmap) throws IOException {
//再进行质量压缩
ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);//100表示不压缩，直接放到out里面
int options = 90;//压缩比例
while (out.toByteArray().length / 1024 > 100) { // 循环判断如果压缩后图片是否大于100kb,大于继续压缩
out.reset(); // 重置baos即清空baos
bitmap.compress(Bitmap.CompressFormat.JPEG, options, out);// 这里压缩options%，把压缩后的数据存放到baos中
options -= 10;// 每次都减少10
}
Log.e("压缩-提交", out.toByteArray().length + "");
byte[] bs = out.toByteArray();//转换为byte提交
return bs;
}
/**
* 得到bitmap
* @param activity 上下文
* @param uri 传入图片的Uri
* @return byte[]
*/
public static Bitmap getCompressionImageBitmap(Activity activity, Uri uri) throws IOException {
return byteToBitmap(getCompressionImageByte(activity,uri));
}
public static Bitmap getCompressionImageBitmap(Bitmap bitmap) throws IOException {
return byteToBitmap(getCompressionImageByte(bitmap));
}
/**
* 得到压缩后的图片uri
* @param activity 上下文
* @param uri 传入图片的Uri,或者bitmap
* @return byte[]
*/
public static Uri getCompressionImageUri(Activity activity, Uri uri) throws IOException {
return bitmapToUri(activity,byteToBitmap(getCompressionImageByte(activity,uri)));
}
public static Uri getCompressionImageUri(Activity activity, Bitmap bitmap) throws IOException {
return bitmapToUri(activity,byteToBitmap(getCompressionImageByte(bitmap)));
}
/**
* 图片尺寸压缩
*
* 宽度高度不一样：依靠规定的高或宽其一最大值来做界限
* 高度宽度一样：依照规定的宽度压缩
*
* @param uri
*/
public static Bitmap getCompressionBitmapFormUri(Activity ac, Uri uri) throws FileNotFoundException, IOException {
InputStream input = ac.getContentResolver().openInputStream(uri);
BitmapFactory.Options onlyBoundsOptions = new BitmapFactory.Options();
onlyBoundsOptions.inJustDecodeBounds = true;
onlyBoundsOptions.inDither = true;//optional
onlyBoundsOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;//optional
BitmapFactory.decodeStream(input, null, onlyBoundsOptions);
input.close();
int originalWidth = onlyBoundsOptions.outWidth;
int originalHeight = onlyBoundsOptions.outHeight;
if ((originalWidth == -1) || (originalHeight == -1))
return null;
//图片分辨率以750x450为标准
float hh = 750f;//这里设置高度为750f
float ww = 450f;//这里设置宽度为450f
float sq = 300f;//这里设置正方形为300f
//缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
Log.e("缩放", originalWidth + "..." + originalHeight);
int be = 1;//be=1表示不缩放
if (originalWidth > originalHeight && originalWidth > ww) {//如果宽度大，根据宽度固定大小缩放
be = (int) (originalWidth / ww);
} else if (originalWidth < originalHeight && originalHeight > hh) {//如果高度高，根据宽度固定大小缩放
be = (int) (originalHeight / hh);
} else if (originalWidth == originalHeight && originalWidth > sq) {//如果高度和宽度一样，根据任意一边大小缩放
//be = (int) (originalHeight / sq);
be = (int) (originalWidth / sq);
}
if (be <= 0) {//如果缩放比比1小，那么保持原图不缩放
be = 1;
}
Log.e("缩放", be + "");
//比例压缩
BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
bitmapOptions.inSampleSize = be;//设置缩放比例
bitmapOptions.inDither = true;//optional
bitmapOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;//optional
input = ac.getContentResolver().openInputStream(uri);
Bitmap bitmap = BitmapFactory.decodeStream(input, null, bitmapOptions);
input.close();
return bitmap;//再进行质量压缩
}
public static Bitmap byteToBitmap(byte[] bs){
return BitmapFactory.decodeByteArray(bs, 0, bs.length);
}
public static Uri bitmapToUri(Context context, Bitmap bitmap){
return Uri.parse(MediaStore.Images.Media.insertImage(context.getContentResolver(), bitmap, "ok",null));
}
}
