Android 图片处理工具类封装2
http://www.2cto.com/kf/201312/263638.html
- Android 图片处理工具类封装
- 2013-12-10 0个评论 来源:Wiker Yong 的专栏
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android 图片处理工具类封装,包含保存图片、 写文件到SD卡,文件转Bitmap、缩放,给图片加倒影等强大功能
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import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.DisplayMetrics;
/**
* 图片操作工具包
*
* @author liux (http://my.oschina.net/liux)
* @version 1.0
* @created 2012-3-21
*/
public class ImageUtils {
public final static String SDCARD_MNT = "/mnt/sdcard" ;
public final static String SDCARD = "/sdcard" ;
/** 请求相册 */
public static final int REQUEST_CODE_GETIMAGE_BYSDCARD = 0 ;
/** 请求相机 */
public static final int REQUEST_CODE_GETIMAGE_BYCAMERA = 1 ;
/** 请求裁剪 */
public static final int REQUEST_CODE_GETIMAGE_BYCROP = 2 ;
/**
* 写图片文件 在Android系统中,文件保存在 /data/data/PACKAGE_NAME/files 目录下
*
* @throws IOException
*/
public static void saveImage(Context context, String fileName, Bitmap bitmap)
throws IOException {
saveImage(context, fileName, bitmap, 100 );
}
public static void saveImage(Context context, String fileName,
Bitmap bitmap, int quality) throws IOException {
if (bitmap == null || fileName == null || context == null )
return ;
FileOutputStream fos = context.openFileOutput(fileName,
Context.MODE_PRIVATE);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.JPEG, quality, stream);
byte [] bytes = stream.toByteArray();
fos.write(bytes);
fos.close();
}
/**
* 写图片文件到SD卡
*
* @throws IOException
*/
public static void saveImageToSD(Context ctx, String filePath,
Bitmap bitmap, int quality) throws IOException {
if (bitmap != null ) {
File file = new File(filePath.substring( 0 ,
filePath.lastIndexOf(File.separator)));
if (!file.exists()) {
file.mkdirs();
}
BufferedOutputStream bos = new BufferedOutputStream(
new FileOutputStream(filePath));
bitmap.compress(CompressFormat.JPEG, quality, bos);
bos.flush();
bos.close();
if (ctx!= null ){
scanPhoto(ctx, filePath);
}
}
}
/**
* 让Gallery上能马上看到该图片
*/
private static void scanPhoto(Context ctx, String imgFileName) {
Intent mediaScanIntent = new Intent(
Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File file = new File(imgFileName);
Uri contentUri = Uri.fromFile(file);
mediaScanIntent.setData(contentUri);
ctx.sendBroadcast(mediaScanIntent);
}
/**
* 获取bitmap
*
* @param context
* @param fileName
* @return
*/
public static Bitmap getBitmap(Context context, String fileName) {
FileInputStream fis = null ;
Bitmap bitmap = null ;
try {
fis = context.openFileInput(fileName);
bitmap = BitmapFactory.decodeStream(fis);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (OutOfMemoryError e) {
e.printStackTrace();
} finally {
try {
fis.close();
} catch (Exception e) {
}
}
return bitmap;
}
/**
* 获取bitmap
*
* @param filePath
* @return
*/
public static Bitmap getBitmapByPath(String filePath) {
return getBitmapByPath(filePath, null );
}
public static Bitmap getBitmapByPath(String filePath,
BitmapFactory.Options opts) {
FileInputStream fis = null ;
Bitmap bitmap = null ;
try {
File file = new File(filePath);
fis = new FileInputStream(file);
bitmap = BitmapFactory.decodeStream(fis, null , opts);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (OutOfMemoryError e) {
e.printStackTrace();
} finally {
try {
fis.close();
} catch (Exception e) {
}
}
return bitmap;
}
/**
* 获取bitmap
*
* @param file
* @return
*/
public static Bitmap getBitmapByFile(File file) {
FileInputStream fis = null ;
Bitmap bitmap = null ;
try {
fis = new FileInputStream(file);
bitmap = BitmapFactory.decodeStream(fis);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (OutOfMemoryError e) {
e.printStackTrace();
} finally {
try {
fis.close();
} catch (Exception e) {
}
}
return bitmap;
}
/**
* 使用当前时间戳拼接一个唯一的文件名
*
* @param format
* @return
*/
public static String getTempFileName() {
SimpleDateFormat format = new SimpleDateFormat( "yyyy-MM-dd_HH-mm-ss_SS" );
String fileName = format.format( new Timestamp(System
.currentTimeMillis()));
return fileName;
}
/**
* 获取照相机使用的目录
*
* @return
*/
public static String getCamerPath() {
return Environment.getExternalStorageDirectory() + File.separator
+ "FounderNews" + File.separator;
}
/**
* 判断当前Url是否标准的content://样式,如果不是,则返回绝对路径
*
* @param uri
* @return
*/
public static String getAbsolutePathFromNoStandardUri(Uri mUri) {
String filePath = null ;
String mUriString = mUri.toString();
mUriString = Uri.decode(mUriString);
String pre1 = "file://" + SDCARD + File.separator;
String pre2 = "file://" + SDCARD_MNT + File.separator;
if (mUriString.startsWith(pre1)) {
filePath = Environment.getExternalStorageDirectory().getPath()
+ File.separator + mUriString.substring(pre1.length());
} else if (mUriString.startsWith(pre2)) {
filePath = Environment.getExternalStorageDirectory().getPath()
+ File.separator + mUriString.substring(pre2.length());
}
return filePath;
}
/**
* 通过uri获取文件的绝对路径
*
* @param uri
* @return
*/
public static String getAbsoluteImagePath(Activity context, Uri uri) {
String imagePath = "" ;
String[] proj = { MediaStore.Images.Media.DATA };
Cursor cursor = context.managedQuery(uri, proj, // Which columns to
// return
null , // WHERE clause; which rows to return (all rows)
null , // WHERE clause selection arguments (none)
null ); // Order-by clause (ascending by name)
if (cursor != null ) {
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
if (cursor.getCount() > 0 && cursor.moveToFirst()) {
imagePath = cursor.getString(column_index);
}
}
return imagePath;
}
/**
* 获取图片缩略图 只有Android2.1以上版本支持
*
* @param imgName
* @param kind
* MediaStore.Images.Thumbnails.MICRO_KIND
* @return
*/
public static Bitmap loadImgThumbnail(Activity context, String imgName,
int kind) {
Bitmap bitmap = null ;
String[] proj = { MediaStore.Images.Media._ID,
MediaStore.Images.Media.DISPLAY_NAME };
Cursor cursor = context.managedQuery(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,
MediaStore.Images.Media.DISPLAY_NAME + "='" + imgName + "'" ,
null , null );
if (cursor != null && cursor.getCount() > 0 && cursor.moveToFirst()) {
ContentResolver crThumb = context.getContentResolver();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 1 ;
bitmap = MethodsCompat.getThumbnail(crThumb, cursor.getInt( 0 ),
kind, options);
}
return bitmap;
}
public static Bitmap loadImgThumbnail(String filePath, int w, int h) {
Bitmap bitmap = getBitmapByPath(filePath);
return zoomBitmap(bitmap, w, h);
}
/**
* 获取SD卡中最新图片路径
*
* @return
*/
public static String getLatestImage(Activity context) {
String latestImage = null ;
String[] items = { MediaStore.Images.Media._ID,
MediaStore.Images.Media.DATA };
Cursor cursor = context.managedQuery(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, items, null ,
null , MediaStore.Images.Media._ID + " desc" );
if (cursor != null && cursor.getCount() > 0 ) {
cursor.moveToFirst();
for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor
.moveToNext()) {
latestImage = cursor.getString( 1 );
break ;
}
}
return latestImage;
}
/**
* 计算缩放图片的宽高
*
* @param img_size
* @param square_size
* @return
*/
public static int [] scaleImageSize( int [] img_size, int square_size) {
if (img_size[ 0 ] <= square_size && img_size[ 1 ] <= square_size)
return img_size;
double ratio = square_size
/ ( double ) Math.max(img_size[ 0 ], img_size[ 1 ]);
return new int [] { ( int ) (img_size[ 0 ] * ratio),
( int ) (img_size[ 1 ] * ratio) };
}
/**
* 创建缩略图
*
* @param context
* @param largeImagePath
* 原始大图路径
* @param thumbfilePath
* 输出缩略图路径
* @param square_size
* 输出图片宽度
* @param quality
* 输出图片质量
* @throws IOException
*/
public static void createImageThumbnail(Context context,
String largeImagePath, String thumbfilePath, int square_size,
int quality) throws IOException {
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inSampleSize = 1 ;
// 原始图片bitmap
Bitmap cur_bitmap = getBitmapByPath(largeImagePath, opts);
if (cur_bitmap == null )
return ;
// 原始图片的高宽
int [] cur_img_size = new int [] { cur_bitmap.getWidth(),
cur_bitmap.getHeight() };
// 计算原始图片缩放后的宽高
int [] new_img_size = scaleImageSize(cur_img_size, square_size);
// 生成缩放后的bitmap
Bitmap thb_bitmap = zoomBitmap(cur_bitmap, new_img_size[ 0 ],
new_img_size[ 1 ]);
// 生成缩放后的图片文件
saveImageToSD( null ,thumbfilePath, thb_bitmap, quality);
}
/**
* 放大缩小图片
*
* @param bitmap
* @param w
* @param h
* @return
*/
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
Bitmap newbmp = null ;
if (bitmap != null ) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidht = (( float ) w / width);
float scaleHeight = (( float ) h / height);
matrix.postScale(scaleWidht, scaleHeight);
newbmp = Bitmap.createBitmap(bitmap, 0 , 0 , width, height, matrix,
true );
}
return newbmp;
}
public static Bitmap scaleBitmap(Bitmap bitmap) {
// 获取这个图片的宽和高
int width = bitmap.getWidth();
int height = bitmap.getHeight();
// 定义预转换成的图片的宽度和高度
int newWidth = 200 ;
int newHeight = 200 ;
// 计算缩放率,新尺寸除原始尺寸
float scaleWidth = (( float ) newWidth) / width;
float scaleHeight = (( float ) newHeight) / height;
// 创建操作图片用的matrix对象
Matrix matrix = new Matrix();
// 缩放图片动作
matrix.postScale(scaleWidth, scaleHeight);
// 旋转图片 动作
// matrix.postRotate(45);
// 创建新的图片
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0 , 0 , width, height,
matrix, true );
return resizedBitmap;
}
/**
* (缩放)重绘图片
*
* @param context
* Activity
* @param bitmap
* @return
*/
public static Bitmap reDrawBitMap(Activity context, Bitmap bitmap) {
DisplayMetrics dm = new DisplayMetrics();
context.getWindowManager().getDefaultDisplay().getMetrics(dm);
int rHeight = dm.heightPixels;
int rWidth = dm.widthPixels;
// float rHeight=dm.heightPixels/dm.density+0.5f;
// float rWidth=dm.widthPixels/dm.density+0.5f;
// int height=bitmap.getScaledHeight(dm);
// int width = bitmap.getScaledWidth(dm);
int height = bitmap.getHeight();
int width = bitmap.getWidth();
float zoomScale;
/** 方式1 **/
// if(rWidth/rHeight>width/height){//以高为准
// zoomScale=((float) rHeight) / height;
// }else{
// //if(rWidth/rHeight<width height)="" 以宽为准="" zoomscale="((float)" rwidth)="" width;="" }="" **="" 方式2="" if(width*1.5="">= height) {//以宽为准
// if(width >= rWidth)
// zoomScale = ((float) rWidth) / width;
// else
// zoomScale = 1.0f;
// }else {//以高为准
// if(height >= rHeight)
// zoomScale = ((float) rHeight) / height;
// else
// zoomScale = 1.0f;
// }
/** 方式3 **/
if (width >= rWidth)
zoomScale = (( float ) rWidth) / width;
else
zoomScale = 1 .0f;
// 创建操作图片用的matrix对象
Matrix matrix = new Matrix();
// 缩放图片动作
matrix.postScale(zoomScale, zoomScale);
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0 , 0 ,
bitmap.getWidth(), bitmap.getHeight(), matrix, true );
return resizedBitmap;
}
/**
* 将Drawable转化为Bitmap
*
* @param drawable
* @return
*/
public static Bitmap drawableToBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds( 0 , 0 , width, height);
drawable.draw(canvas);
return bitmap;
}
/**
* 获得圆角图片的方法
*
* @param bitmap
* @param roundPx
* 一般设成14
* @return
*/
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242 ;
final Paint paint = new Paint();
final Rect rect = new Rect( 0 , 0 , bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
paint.setAntiAlias( true );
canvas.drawARGB( 0 , 0 , 0 , 0 );
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode( new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
/**
* 获得带倒影的图片方法
*
* @param bitmap
* @return
*/
public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
final int reflectionGap = 4 ;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.preScale( 1 , - 1 );
Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0 , height / 2 ,
width, height / 2 , matrix, false );
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height / 2 ), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(bitmap, 0 , 0 , null );
Paint deafalutPaint = new Paint();
canvas.drawRect( 0 , height, width, height + reflectionGap, deafalutPaint);
canvas.drawBitmap(reflectionImage, 0 , height + reflectionGap, null );
Paint paint = new Paint();
LinearGradient shader = new LinearGradient( 0 , bitmap.getHeight(), 0 ,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff ,
0x00ffffff , TileMode.CLAMP);
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in
paint.setXfermode( new PorterDuffXfermode(Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect( 0 , height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
return bitmapWithReflection;
}
/**
* 将bitmap转化为drawable
*
* @param bitmap
* @return
*/
public static Drawable bitmapToDrawable(Bitmap bitmap) {
Drawable drawable = new BitmapDrawable(bitmap);
return drawable;
}
/**
* 获取图片类型
*
* @param file
* @return
*/
public static String getImageType(File file) {
if (file == null || !file.exists()) {
return null ;
}
InputStream in = null ;
try {
in = new FileInputStream(file);
String type = getImageType(in);
return type;
} catch (IOException e) {
return null ;
} finally {
try {
if (in != null ) {
in.close();
}
} catch (IOException e) {
}
}
}
/**
* 获取图片的类型信息
*
* @param in
* @return
* @see #getImageType(byte[])
*/
public static String getImageType(InputStream in) {
if (in == null ) {
return null ;
}
try {
byte [] bytes = new byte [ 8 ];
in.read(bytes);
return getImageType(bytes);
} catch (IOException e) {
return null ;
}
}
/**
* 获取图片的类型信息
*
* @param bytes
* 2~8 byte at beginning of the image file
* @return image mimetype or null if the file is not image
*/
public static String getImageType( byte [] bytes) {
if (isJPEG(bytes)) {
return "image/jpeg" ;
}
if (isGIF(bytes)) {
return "image/gif" ;
}
if (isPNG(bytes)) {
return "image/png" ;
}
if (isBMP(bytes)) {
return "application/x-bmp" ;
}
return null ;
}
private static boolean isJPEG( byte [] b) {
if (b.length < 2 ) {
return false ;
}
return (b[ 0 ] == ( byte ) 0xFF ) && (b[ 1 ] == ( byte ) 0xD8 );
}
private static boolean isGIF( byte [] b) {
if (b.length < 6 ) {
return false ;
}
return b[ 0 ] == 'G' && b[ 1 ] == 'I' && b[ 2 ] == 'F' && b[ 3 ] == '8'
&& (b[ 4 ] == '7' || b[ 4 ] == '9' ) && b[ 5 ] == 'a' ;
}
private static boolean isPNG( byte [] b) {
if (b.length < 8 ) {
return false ;
}
return (b[ 0 ] == ( byte ) 137 && b[ 1 ] == ( byte ) 80 && b[ 2 ] == ( byte ) 78
&& b[ 3 ] == ( byte ) 71 && b[ 4 ] == ( byte ) 13 && b[ 5 ] == ( byte ) 10
&& b[ 6 ] == ( byte ) 26 && b[ 7 ] == ( byte ) 10 );
}
private static boolean isBMP( byte [] b) {
if (b.length < 2 ) {
return false ;
}
return (b[ 0 ] == 0x42 ) && (b[ 1 ] == 0x4d );
}
}
|
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