Android 保存本地图片
1.工具类BitmapUtils
public class BitmapUtils {
public static Bitmap mirror(Bitmap rawBitmap) {
Matrix matrix = new Matrix();
matrix.postScale(-1f, 1f);
return Bitmap.createBitmap(rawBitmap, 0, 0, rawBitmap.getWidth(), rawBitmap.getHeight(), matrix, true);
}
public static Bitmap rotateBitmap(Bitmap bm, int degree) {
Bitmap returnBm = null;
// 根据旋转角度，生成旋转矩阵
Matrix matrix = new Matrix();
matrix.postRotate(degree);
try {
// 将原始图片按照旋转矩阵进行旋转，并得到新的图片
returnBm = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true);
} catch (OutOfMemoryError e) {
}
if (returnBm == null) {
returnBm = bm;
}
if (bm != returnBm) {
bm.recycle();
}
return returnBm;
}
/**
* 将bitmap转换成bytes
*/
public static byte[] bitmapToBytes(Bitmap bitmap, int quality) {
if (bitmap == null) {
return null;
}
int size = bitmap.getWidth() * bitmap.getHeight() * 4;
ByteArrayOutputStream out = new ByteArrayOutputStream(size);
try {
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, out);
out.flush();
out.close();
return out.toByteArray();
} catch (IOException e) {
return null;
}
}
/**
* 将图片保存到磁盘中
*
* @param bitmap
* @param file 图片保存目录——不包含图片名
* @param path 图片保存文件路径——包含图片名
* @return
*/
public static boolean saveBitmap(Bitmap bitmap, File file, File path) {
boolean success = false;
byte[] bytes = bitmapToBytes(bitmap, 100);
OutputStream out = null;
try {
if (!file.exists() && file.isDirectory()) {
file.mkdirs();
}
out = new FileOutputStream(path);
out.write(bytes);
out.flush();
success = true;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return success;
}
/**
* 高级图片质量压缩
*
* @param bitmap 位图
* @param width 压缩后的宽度，单位像素
*/
public static Bitmap imageZoom(Bitmap bitmap, double width) {
// 将bitmap放至数组中，意在获得bitmap的大小（与实际读取的原文件要大）
ByteArrayOutputStream baos = new ByteArrayOutputStream();
// 格式、质量、输出流
bitmap.compress(Bitmap.CompressFormat.JPEG, 80, baos);
byte[] b = baos.toByteArray();
Bitmap newBitmap = BitmapFactory.decodeByteArray(b, 0, b.length);
// 获取bitmap大小 是允许最大大小的多少倍
return scaleWithWH(newBitmap, width,
width * newBitmap.getHeight() / newBitmap.getWidth());
}
/***
* 图片缩放
*@param bitmap 位图
* @param w 新的宽度
* @param h 新的高度
* @return Bitmap
*/
public static Bitmap scaleWithWH(Bitmap bitmap, double w, double h) {
if (w == 0 || h == 0 || bitmap == null) {
return bitmap;
} else {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = (float) (w / width);
float scaleHeight = (float) (h / height);
matrix.postScale(scaleWidth, scaleHeight);
return Bitmap.createBitmap(bitmap, 0, 0, width, height,
matrix, true);
}
}
/**
* bitmap保存到指定路径
*
* @param file 图片的绝对路径
* @param file 位图
* @return bitmap
*/
public static boolean saveFile(String file, Bitmap bmp) {
if (TextUtils.isEmpty(file) || bmp == null) return false;
File f = new File(file);
if (f.exists()) {
f.delete();
} else {
File p = f.getParentFile();
if (!p.exists()) {
p.mkdirs();
}
}
try {
FileOutputStream out = new FileOutputStream(f);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, out);
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
/**
* 保存bitmap到SD卡，请确认应用有存储权限
*
* @param bmp 获取的bitmap数据
* @param picName 自定义的图片名
*/
public static File saveBmp2Gallery(Context context, String fileSavePath, Bitmap bmp, String picName) {
File galleryPath = new File(fileSavePath);
if (!galleryPath.exists()) {
galleryPath.mkdir();
}
// 声明文件对象
File file = null;
// 声明输出流
FileOutputStream outStream = null;
String fileName = null;
try {
// 如果有目标文件，直接获得文件对象，否则创建一个以filename为名称的文件
file = new File(galleryPath, picName + ".jpg");
// if(file.exists()){
// file.delete();
// file = new File(galleryPath, picName + ".jpg");
// }
// file = new File(galleryPath, photoName);
// 获得文件相对路径
fileName = file.toString();
// 获得输出流，如果文件中有内容，追加内容
outStream = new FileOutputStream(fileName);
if (null != outStream) {
bmp.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
}
} catch (Exception e) {
e.getStackTrace();
} finally {
try {
if (outStream != null) {
outStream.flush();
outStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
try {
MediaScannerConnection.scanFile(context, new String[]{fileName}, null, null);
Toast.makeText(context, context.getResources().getString(R.string.pic_save_success), Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, context.getResources().getString(R.string.pic_save_fail), Toast.LENGTH_SHORT).show();
}
return file;
}
public static boolean saveBmp2Gallery2(Context context, String fileSavePath, Bitmap bmp, String picName) {
isFolderExists(fileSavePath);
File galleryPath = new File(fileSavePath);
if (!galleryPath.exists()) {
galleryPath.mkdir();
}
// 声明文件对象
File file = null;
// 声明输出流
FileOutputStream outStream = null;
String fileName = null;
try {
// 如果有目标文件，直接获得文件对象，否则创建一个以filename为名称的文件
file = new File(galleryPath, picName + ".jpg");
// if(file.exists()){
// file.delete();
// file = new File(galleryPath, picName + ".jpg");
// }
// file = new File(galleryPath, photoName);
// 获得文件相对路径
fileName = file.toString();
// 获得输出流，如果文件中有内容，追加内容
outStream = new FileOutputStream(fileName);
if (null != outStream) {
bmp.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
}
} catch (Exception e) {
e.getStackTrace();
} finally {
try {
if (outStream != null) {
outStream.flush();
outStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
try {
MediaScannerConnection.scanFile(context, new String[]{fileName}, null, null);
Toast.makeText(context, context.getResources().getString(R.string.pic_save_success), Toast.LENGTH_SHORT).show();
return true;
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, context.getResources().getString(R.string.pic_save_fail), Toast.LENGTH_SHORT).show();
}
return false;
}
//判断是否存在，不存在创建文件夹
public static boolean isFolderExists(String strFolder) {
File file = new File(strFolder);
if (!file.exists()) {
if (file.mkdirs()) {
return true;
} else {
return false;
}
}
return true;
}
/**
* 把两个位图覆盖合成为一个位图，以底层位图的长宽为基准
*
* @param backBitmap 在底部的位图
* @param frontBitmap 盖在上面的位图
* @return
*/
public static Bitmap mergeBitmap(Bitmap backBitmap, Bitmap frontBitmap, int leftFront, int topFront) {
if (backBitmap == null || backBitmap.isRecycled()
|| frontBitmap == null || frontBitmap.isRecycled()) {
return null;
}
// Bitmap bitmap = backBitmap.copy(Bitmap.Config.ARGB_8888, true);
// Canvas canvas = new Canvas(bitmap);
// canvas.drawBitmap(backBitmap, 0, 0, null);
// canvas.drawBitmap(frontBitmap, leftFront, topFront, null);
Bitmap bitmap = frontBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(bitmap);
float x = (float)(bitmap.getWidth()) / (float)(backBitmap.getWidth());
float y = (float)(bitmap.getHeight()) / (float)(backBitmap.getHeight());
Matrix matrix = new Matrix();
matrix.postScale(x, y); // 缩放比例 大于1为放大
backBitmap = Bitmap.createBitmap(backBitmap, 0, 0, backBitmap.getWidth(), backBitmap.getHeight(), matrix, true);
canvas.drawBitmap(backBitmap, 0, 0, null);
canvas.drawBitmap(frontBitmap, 0, 0, null);
return bitmap;
}
/**
* 把两个位图覆盖合成为一个位图，以底层位图的长宽为基准
*
* @param bytes 在底部的位图
* @param bytes2 盖在上面的位图
*/
public static void savaRawFile(byte[] bytes, byte[] bytes2) {
try {
File path = new File("/sdcard");
if (!path.exists() && path.isDirectory()) {
path.mkdirs();
}
File file = new File("/sdcard/", new SimpleDateFormat("_HHmmss_yyMMdd").
format(new Date(System.currentTimeMillis())) + ".bin");
FileOutputStream fos = new FileOutputStream(file);
fos.write(bytes);
fos.write(bytes2);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 保存红外数据
*
* @param bytes
*/
public static void savaIRFile(byte[] bytes) {
try {
File path = new File("/sdcard");
if (!path.exists() && path.isDirectory()) {
path.mkdirs();
}
File file = new File("/sdcard/", "ir" + new SimpleDateFormat("_HHmmss_yyMMdd").
format(new Date(System.currentTimeMillis())) + ".bin");
FileOutputStream fos = new FileOutputStream(file);
fos.write(bytes);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 保存温度数据
*
* @param bytes
*/
public static void savaTempFile(byte[] bytes) {
try {
File path = new File("/sdcard");
if (!path.exists() && path.isDirectory()) {
path.mkdirs();
}
File file = new File("/sdcard/", "temp" + new SimpleDateFormat("_HHmmss_yyMMdd").
format(new Date(System.currentTimeMillis())) + ".bin");
FileOutputStream fos = new FileOutputStream(file);
fos.write(bytes);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* @param context
* @param file
* @return
*/
public static boolean isFileExists(Context context, final File file) {
if (file == null) return false;
if (file.exists()) {
return true;
}
return isFileExists(context, file.getAbsolutePath());
}
/**
* Return whether the file exists.
*
* @param filePath The path of file.
* @return {@code true}: yes<br>{@code false}: no
*/
public static boolean isFileExists(Context context, final String filePath) {
File file = new File(filePath);
if (file == null) return false;
if (file.exists()) {
return true;
}
return isFileExistsApi29(context, filePath);
}
/**
* @param context
* @param filePath
* @return
*/
private static boolean isFileExistsApi29(Context context, String filePath) {
if (Build.VERSION.SDK_INT >= 29) {
try {
Uri uri = Uri.parse(filePath);
ContentResolver cr = context.getContentResolver();
AssetFileDescriptor afd = cr.openAssetFileDescriptor(uri, "r");
if (afd == null) return false;
try {
afd.close();
} catch (IOException ignore) {
}
} catch (FileNotFoundException e) {
return false;
}
return true;
}
return false;
}
/**
* short数组转byte数组
*
* @param src
* @return
*/
private static byte[] toByteArray(short[] src) {
int count = src.length;
byte[] dest = new byte[count << 1];
for (int i = 0; i < count; i++) {
dest[i * 2] = (byte) ((src[i] >> 8) & 0xFF);
dest[i * 2 + 1] = (byte) (src[i] & 0xFF);
}
return dest;
}
/**
* byte数组转short数组
*
* @param src
* @return
*/
public static short[] toShortArray(byte[] src) {
int count = src.length >> 1;
short[] dest = new short[count];
for (int i = 0; i < count; i++) {
dest[i] = (short) ((src[i * 2] & 0xFF) << 8 | ((src[2 * i + 1] & 0xFF)));
}
return dest;
}
/**
* @param bytes
* @param fileTitle
*/
public static void saveShortFile(String fileDir, short[] bytes, String fileTitle) {
// 创建目录
createOrExistsDir(fileDir);
try {
File file = new File(fileDir, fileTitle + ".bin");
createOrExistsDir(file);
Log.i("TAG", "getAbsolutePath = " + file.getAbsolutePath());
FileOutputStream fos = new FileOutputStream(file);
fos.write(toByteArray(bytes));
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* @param file
*/
private static void createOrExistsDir(File file) {
// 文件不存在则创建文件
if (!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 如果文件夹不存在则创建
*
* @param fileDir
*/
private static void createOrExistsDir(String fileDir) {
File file = new File(fileDir);
//如果文件夹不存在则创建
if (!file.exists() && !file.isDirectory()) {
//不存在
file.mkdir();
} else {
//目录存在
}
}
private static int sBufferSize = 524288;
/**
* @param context
* @param file
* @return
*/
public static byte[] readFile2BytesByStream(Context context, final File file) {
if (!isFileExists(context, file)) return null;
try {
ByteArrayOutputStream os = null;
InputStream is = new BufferedInputStream(new FileInputStream(file), sBufferSize);
try {
os = new ByteArrayOutputStream();
byte[] b = new byte[sBufferSize];
int len;
while ((len = is.read(b, 0, sBufferSize)) != -1) {
os.write(b, 0, len);
}
return os.toByteArray();
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
if (os != null) {
os.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}
}
}2.使用方法
// 保存图片
boolean isSucc = BitmapUtils.saveBmp2Gallery2(this, App.getInstance().INFISENSE_SAVE_DIR + File.separator + DateUtils.getCurrentTime_Today("yyyy-MM-dd"), bitmap, "名称");3.保存地址
/**
*图片保存的文件夹
*/
public String INFISENSE_SAVE_DIR;
@Override
public void onCreate() {
super.onCreate();
INFISENSE_SAVE_DIR = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getAbsolutePath()
+ File.separator + Constant.FOLDER_INFRARED_TEMP;//FOLDER_INFRARED_TEMP文件夹名称
File file = new File(INFISENSE_SAVE_DIR);
if (!file.exists()){
file.mkdirs();
}
}