一直在使用的一个Bitmap工具类
处理Bitmap和ImageView对象,实现了下面功能:
1.saveBitmap: 把Bitmap对象持久存储到SD卡或手机内存.
2.getViewBitmap: 从view得到bitmap对象
3.addWatermark: Bitmap加水印
4.zoomBitmap: 放大缩小图片
5.getLoacalBitmap: 传入路径,从持久存储(SD卡或手机内存)得到Bitmap对象
6.getBitMapByUrl: 通过URL地址获取Bitmap对象
7.toGrayscale: 对Bitmap进行滤镜特效处理.实现了图片变黑白,变亮,变暗,高对照,低对照,高饱和,低饱和
下载地址:http://download.csdn.net/download/landehuxi/6661713
源代码例如以下:
public class ImgService {
//亮
public final float[] LIGHT_ARR = new float[] {
1, 0, 0, 0, 100,
0, 1, 0, 0, 100,
0, 0, 1, 0, 100,
0, 0, 0, 1, 0 };
//暗
public final float[] DARK_ARR = new float[] {
0.2f, 0, 0, 0, 50.8f,
0, 0.2f, 0, 0, 50.8f,
0, 0,0.2f, 0, 50.8f,
0, 0, 0, 1f, 0 };
//高对照
public final float[] GDB_ARR = new float[] {
5, 0, 0, 0, -250,
0, 5, 0, 0, -250,
0, 0, 5, 0, -250,
0, 0, 0, 1, 0 };
//高对照
public final float[] DDB_ARR = new float[] {
0.2f, 0, 0, 0, 50,
0, 0.2f, 0, 0, 50,
0, 0, 0.2f, 0, 50,
0, 0, 0, 1, 0 };
//高饱和
public final float[] GBH_ARR = new float[] {
3f, -1.8f, -0.25f, 0, 50,
-0.9f, 2.1f, -0.25f, 0, 50,
-0.9f, -1.8f, 3.8f, 0, 50,
0, 0, 0, 1, 0 };
//低饱和
public final float[] DBH_ARR = new float[] {
0.3f, 0.6f, 0.08f, 0, 0,
0.3f, 0.6f, 0.08f, 0, 0,
0.3f, 0.6f, 0.08f, 0, 0,
0, 0, 0, 1, 0 };
//COPY
public final float[] COPY_ARR = new float[] {
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0 };
/**
* 为图片加滤镜特效.array參数为ImgService定义的几个滤镜矩阵.如ImgService.LIGHT_ARR
* @param bmpOriginal
* @param array
* @return
*/
public Bitmap toGrayscale(Bitmap bmpOriginal, float[] array) {
int width, height;
height = bmpOriginal.getHeight();
width = bmpOriginal.getWidth();
Bitmap bmpGrayscale = Bitmap.createBitmap(width, height,
Bitmap.Config.RGB_565);
Canvas c = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.set(array);
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
c.drawBitmap(bmpOriginal, 0, 0, paint);
bmpOriginal.recycle();
bmpOriginal=null;
return bmpGrayscale;
}
public boolean saveBitmap(Bitmap bitmap, String fileName, String path) {
File file = new File(path);
FileOutputStream fos=null;
if (!file.exists()) {
file.mkdir();
}
File imageFile = new File(file, fileName);
try {
imageFile.createNewFile();
fos = new FileOutputStream(imageFile);
bitmap.compress(CompressFormat.JPEG, 50, fos);
fos.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if(fos!=null){
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
fos=null;
}
}
return true;
}
// 从view得到bitmap
public Bitmap getViewBitmap(View view) {
Bitmap bitmap = null;
try {
int width = view.getWidth();
int height = view.getHeight();
if (width != 0 && height != 0) {
bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
}
} catch (Exception e) {
bitmap = null;
Debug.out(e);
}
return bitmap;
}
// Bitmap加水印
public Bitmap addWatermark(Bitmap src, Bitmap watermark) {
if (src == null || watermark == null) {
return src;
}
int sWid = src.getWidth();
int sHei = src.getHeight();
int wWid = watermark.getWidth();
int wHei = watermark.getHeight();
if (sWid == 0 || sHei == 0) {
return null;
}
if (sWid < wWid || sHei < wHei) {
return src;
}
Bitmap bitmap = Bitmap.createBitmap(sWid, sHei, Config.ARGB_8888);//Config可改动,改变内存占用
try {
Canvas cv = new Canvas(bitmap);
cv.drawBitmap(src, 0, 0, null);
cv.drawBitmap(watermark, sWid - wWid - 5, sHei - wHei - 5, null);
cv.save(Canvas.ALL_SAVE_FLAG);
cv.restore();
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}finally{
src.recycle();
src=null;
watermark.recycle();
watermark=null;
}
return bitmap;
}
/**
* 放大缩小图片
*
* @Title: zoomBitmap
* @param @param bitmap
* @param @param w
* @param @param h
* @return Bitmap
* @throws
*/
public 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);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
bitmap.recycle();
bitmap=null;
return newbmp;
}
/**
* @Title: getLoacalBitmap
* @Description: 载入本地图片
* @param @param url 本地路径
* @param @return
* @return Bitmap
* @throws
*/
public Bitmap getLoacalBitmap(String url) {
if (url != null) {
FileInputStream fis=null;
try {
fis = new FileInputStream(url);
return BitmapFactory.decodeStream(fis); // /把流转化为Bitmap图片
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
}finally{
StreamService.close(fis);
if(fis!=null){
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
fis=null;
}
}
} else {
return null;
}
}
/**
* 通过URL地址获取Bitmap对象
*
* @Title: getBitMapByUrl
* @param @param url
* @param @return
* @param @throws Exception
* @return Bitmap
* @throws
*/
public Bitmap getBitMapByUrl(final String url) {
URL fileUrl = null;
InputStream is=null;
Bitmap bitmap = null;
try {
fileUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) fileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
if (null!=is) {
is.close();
}
} catch (IOException e) {
e.printStackTrace();
}
is=null;
}
return bitmap;
}
}