Android 图片转化工具类BitmapUtil

/**
* 图片转化工具
* @author chen.lin
*
*/
public class BitmapUtils {

private static Map<String, SoftReference<Bitmap>> imageCache = new HashMap<String, SoftReference<Bitmap>>();

public static void addBitmapToCache(String path) {
// 强引用的Bitmap对象
Bitmap bitmap = BitmapFactory.decodeFile(path);
// 软引用的Bitmap对象
SoftReference<Bitmap> softBitmap = new SoftReference<Bitmap>(bitmap);
// 添加该对象到Map中使其缓存
imageCache.put(path, softBitmap);
}

public static Bitmap getBitmapByPath(String path) {
// 从缓存中取软引用的Bitmap对象
SoftReference<Bitmap> softBitmap = imageCache.get(path);
// 判断是否存在软引用
if (softBitmap == null) {
return null;
}
// 取出Bitmap对象，如果由于内存不足Bitmap被回收，将取得空
Bitmap bitmap = softBitmap.get();
return bitmap;
}

/**
* @param drawable
* @return
*/
public static Bitmap drawableToBitmap(Drawable drawable) {
Bitmap bitmap = Bitmap.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
// canvas.setBitmap(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}

public static String getBase64(byte[] image) {
String string = "";
try {
BASE64Encoder encoder = new BASE64Encoder();
string = encoder.encodeBuffer(image).trim();
} catch (Exception e) {
e.printStackTrace();
}
return string;
}

/**
* @param R_DRAWABLE_ID
* @return
*/

@SuppressWarnings("deprecation")
public static Drawable getDrawable(byte[] imgByte) {
Bitmap bitmap;
if (imgByte != null) {
bitmap = BitmapFactory.decodeByteArray(imgByte, 0, imgByte.length);
Drawable drawable = new BitmapDrawable(bitmap);

return drawable;
}
return null;
}

/**
* 閫氳繃bitmap 鑾峰彇浜岃繘鍒舵暟鎹?
* @param image
* @return
*/
public static byte[] getDefaultIcon(Bitmap image) {
// iconView.get
// BitmapFactory.
byte[] compressData = null;
if (image != null) {
compressData = getByteByBitmap(image);
}
return compressData;
}

private static byte[] getByteByBitmap(Bitmap bmp) {
Bitmap output = Bitmap.createScaledBitmap(bmp, 150, bmp.getHeight()
* 150 / bmp.getWidth(), true);
// 涓?畾瑕佸垽鏂紝濡傛灉鍥剧墖鍘嬬缉鍓嶅悗width,height涓嶅彉锛?
// 寮曠敤鍚屼竴涓璞★紝绯荤粺浼氭姤
// Canvas: trying to use a recycled bitmap android.graphics.Bitmap閿欒
if (bmp != output) {
bmp.recycle();
bmp = null;
}
byte[] compressData = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
try {
output.compress(Bitmap.CompressFormat.PNG, 100, baos);
} catch (Exception e) {
e.printStackTrace();
}
compressData = baos.toByteArray();
baos.close();
} catch (IOException e) {
e.printStackTrace();
}
return compressData;
}

/**
* @param bitmap
* @param _width
* @param _height
* @return
*/
public static Bitmap setBitmapSize(Bitmap bitmap, int _width, int _height) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int newWidth = _width;
int newHeight = _height;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
}

/**
* @param bitmap
* @param _width
* @param _height
* @return
*/
public static Bitmap setBitmapSize(String bitmapPath, int _width,
int _height) {
Bitmap bitmap = BitmapFactory.decodeFile(bitmapPath);
if (bitmap == null) {
Logger.i("bitmap", "bitmap------------>发生未知异常！");
return null;
}
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int newWidth = _width;
int newHeight = _height;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
}

/**
* @param bitmap
* @return
*/
public static Bitmap setBitmapSize(String bitmapPath) {
Bitmap bitmap = BitmapFactory.decodeFile(bitmapPath);
if (bitmap == null) {
Logger.i("bitmap", "bitmap------------>发生未知异常！");
return null;
}
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int newWidth = width;
int newHeight = height;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
return Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
}

}