Android BitmapUtils工具类使用详解

public final class BitmapUtils {
public static final String TAG = "BitmapUtil";
private static int sShotScreenWidth = 480;
private static int sShotScreenHeight = 720;
private static int sShotScreenSize = sShotScreenWidth * sShotScreenHeight;
@SuppressLint("StaticFieldLeak")
private static Context mContext;
@SuppressLint("StaticFieldLeak")
private static Activity mActivity;
public void init(Context context,Activity ac) {
mContext=context;
mActivity=ac;
DisplayMetrics dm = new DisplayMetrics();
ac.getWindowManager().getDefaultDisplay().getMetrics(dm);
//获取屏幕分辨率
sShotScreenWidth = dm.widthPixels;
sShotScreenHeight = dm.heightPixels;
sShotScreenSize = sShotScreenWidth * sShotScreenHeight;
}
/**
* 图片合成
* 
* @param bitmap 位图1
* @param mark 位图2
* @return Bitmap
*/
public static Bitmap createBitmap(Bitmap bitmap, Bitmap mark) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int mW = mark.getWidth();
int mH = mark.getHeight();
Bitmap newbitmap = Bitmap.createBitmap(w, h, Config.ARGB_8888);// 创建一个长宽一样的位图
Canvas cv = new Canvas(newbitmap);
cv.drawBitmap(bitmap, 0, 0, null);// 在 0，0坐标开始画入bitmap
cv.drawBitmap(mark, w - mW , h - mH , null);// 在右下角画入水印mark
cv.save(Canvas.ALL_SAVE_FLAG);// 保存
cv.restore();// 存储
return newbitmap;
}
/**
* 放大缩小图片
* @param bitmap 位图
* @param w 新的宽度
* @param h 新的高度
* @return Bitmap
*/
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
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);
return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
}
/**
* 旋转图片
* @param bitmap 要旋转的图片
* @param angle 旋转角度
* @return bitmap
*/
public static Bitmap rotate(Bitmap bitmap,int angle) {
Matrix matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
bitmap.getHeight(), matrix, true);
}
/**
* 圆形图片
*@param source 位图
* @param strokeWidth 裁剪范围 0表示最大
* @param bl 是否需要描边
* @param bl 画笔粗细
* @param bl 颜色代码
* @return bitmap
*/
public static Bitmap createCircleBitmap(Bitmap source, int strokeWidth, boolean bl,int edge,int color) {
int diameter = source.getWidth() < source.getHeight() ? source.getWidth() : source.getHeight();
Bitmap target = Bitmap.createBitmap(diameter, diameter, Config.ARGB_8888);
Canvas canvas = new Canvas(target);//创建画布
Paint paint = new Paint();
paint.setAntiAlias(true);
canvas.drawCircle(diameter / 2, diameter / 2, diameter / 2, paint);//绘制圆形
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));//取相交裁剪
canvas.drawBitmap(source, strokeWidth, strokeWidth, paint);
if(bl) {
if (color == 0) color = 0xFFFEA248;//默认橘黄色
paint.setColor(color);
paint.setStyle(Paint.Style.STROKE);//描边
paint.setStrokeWidth(edge);
canvas.drawCircle(diameter / 2, diameter / 2, diameter / 2, paint);
}
return target;
}
/**
* 圆角图片
* @param bitmap 位图
* @param rx x方向上的圆角半径
* @param ry y方向上的圆角半径
* @param bl 是否需要描边
* @param bl 画笔粗细
* @param bl 颜色代码
* @return bitmap
*/
public static Bitmap createCornerBitmap(Bitmap bitmap,int rx,int ry,boolean bl,int edge,int color) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);//创建画布
Paint paint = new Paint();
paint.setAntiAlias(true);
Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
RectF rectF = new RectF(rect);
canvas.drawRoundRect(rectF, rx, ry, paint);//绘制圆角矩形
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));//取相交裁剪
canvas.drawBitmap(bitmap, rect, rect, paint);
if(bl) {
if (color == 0) color = 0xFFFEA248;//默认橘黄色
paint.setColor(color);
paint.setColor(color);
paint.setStyle(Paint.Style.STROKE);//描边
paint.setStrokeWidth(edge);
canvas.drawRoundRect(rectF, rx, ry, paint);
}
return output;
}
/**
* 按比例裁剪图片
* @param bitmap 位图
* @param wScale 裁剪宽 0~100%
* @param hScale 裁剪高 0~100%
* @return bitmap
*/
public static Bitmap cropBitmap(Bitmap bitmap, float wScale, float hScale) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
int wh = (int) (w * wScale);
int hw = (int) (h * hScale);
int retX = (int) (w * (1 - wScale) / 2);
int retY = (int) (h * (1 - hScale) / 2);
return Bitmap.createBitmap(bitmap, retX, retY, wh, hw, null, false);
}
/**
* 获得带倒影的图片方法
* @param bitmap 位图
* @param region 倒影区域 0.1~1
* @return bitmap
*/
public static Bitmap createReflectionBitmap(Bitmap bitmap,float region) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);//镜像缩放
Bitmap reflectionBitmap = Bitmap.createBitmap(
bitmap,0
, (int)(height*(1-region))//从哪个点开始绘制
, width
,(int) (height*region)//绘制多高
, matrix, false);
Bitmap reflectionWithBitmap = Bitmap.createBitmap(width,height+ (int) (height*region),
Config.ARGB_8888);
Canvas canvas = new Canvas(reflectionWithBitmap);
canvas.drawBitmap(bitmap, 0, 0, null);
canvas.drawBitmap(reflectionBitmap, 0, height , null);
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
reflectionWithBitmap.getHeight()
, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
Paint paint = new Paint();
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));//取两层绘制交集。显示下层。
canvas.drawRect(0, height, width, reflectionWithBitmap.getHeight() , paint);
return reflectionWithBitmap;
}
/**
* 图片质量压缩
* @param bitmap
* @param many 百分比
* @return
*/
public static Bitmap compressBitmap(Bitmap bitmap, float many){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, (int)many*100, baos);
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
return BitmapFactory.decodeStream(isBm, null, null);
}
/**
* 高级图片质量压缩
*@param bitmap 位图
* @param maxSize 压缩后的大小，单位kb
*/
public static Bitmap imageZoom(Bitmap bitmap, double maxSize) {
// 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.PNG, 70, baos);
byte[] b = baos.toByteArray();
// 将字节换成KB
double mid = b.length / 1024;
// 获取bitmap大小 是允许最大大小的多少倍
double i = mid / maxSize;
// 判断bitmap占用空间是否大于允许最大空间 如果大于则压缩 小于则不压缩
doRecycledIfNot(bitmap);
if (i   1) {
// 缩放图片 此处用到平方根 将宽带和高度压缩掉对应的平方根倍
// （保持宽高不变，缩放后也达到了最大占用空间的大小）
return scaleWithWH(bitmap,bitmap.getWidth() / Math.sqrt(i),
bitmap.getHeight() / Math.sqrt(i));
}
return null;
}
/***
* 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);
}
}
/**
* YUV视频流格式转bitmap
* @param data YUV视频流格式
* @return width 设置宽度
* @return width 设置高度
*/
public static Bitmap getBitmap(byte[] data, int width, int height) {
Bitmap bitmap;
YuvImage yuvimage = new YuvImage(data, ImageFormat.NV21, width, height, null);
//data是onPreviewFrame参数提供
ByteArrayOutputStream baos = new ByteArrayOutputStream();
yuvimage.compressToJpeg(new Rect(0, 0, yuvimage.getWidth(), yuvimage.getHeight()), 100, baos);//
// 80--JPG图片的质量[0-100],100最高
byte[] rawImage = baos.toByteArray();
BitmapFactory.Options options = new BitmapFactory.Options();
SoftReference<Bitmap  softRef = new SoftReference<Bitmap (BitmapFactory.decodeByteArray(rawImage, 0, rawImage
.length, options));
bitmap = softRef.get();
return bitmap;
}
/**
* 图片路径转bitmap
* @param file 图片的绝对路径
* @return bitmap
*/
public static Bitmap getAssetImage(String file) {
Bitmap bitmap = null;
AssetManager am = mActivity.getAssets();
try {
InputStream is = am.open(file);
bitmap = BitmapFactory.decodeStream(is);
is.close();
} catch (IOException e) {
e.printStackTrace();
}
return bitmap;
}
/**
* 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) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
return true;
}
/**
* 回收一个未被回收的Bitmap
*@param bitmap
*/
public static void doRecycledIfNot(Bitmap bitmap) {
if (!bitmap.isRecycled()) {
bitmap.recycle();
}
}
}