android 图片处理
* 使头像变灰
* @param drawable
*/
public static void porBecomeGrey(ImageView imageView, Drawable drawable) {
drawable.mutate();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);
drawable.setColorFilter(cf);
imageView.setImageDrawable(drawable);
}
Drawable drawable = new FastBitmapDrawable(bitmap);
public byte[] getBitmapByte(Bitmap bitmap){
ByteArrayOutputStream out = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return out.toByteArray();
}
public Bitmap getBitmapFromByte(byte[] temp){
if(temp != null){
Bitmap bitmap = BitmapFactory.decodeByteArray(temp, 0, temp.length);
return bitmap;
}else{
return null;
}
}
/**
* 将Drawable转化为Bitmap
* @param drawable
* @return
*/
1.
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;
}
/**
* 获取图片的倒影
* @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);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
return bitmapWithReflection;
}
/**
* 把图片变成圆角
* @param bitmap 需要修改的图片
* @param pixels 圆角的弧度
* @return 圆角图片
*/
public static Bitmap toRoundCorner(Bitmap bitmap, int pixels) {
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);
final float roundPx = pixels;
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;
}
/**
* 缩放图片
* @param bmp
* @param width
* @param height
* @return
*/
public static Bitmap PicZoom(Bitmap bmp, int width, int height) {
int bmpWidth = bmp.getWidth();
int bmpHeght = bmp.getHeight();
Matrix matrix = new Matrix();
matrix.postScale((float) width / bmpWidth, (float) height / bmpHeght);
return Bitmap.createBitmap(bmp, 0, 0, bmpWidth, bmpHeght, matrix, true);
}
/**
* @param photoPath --原图路经
* @param aFile --保存缩图
* @param newWidth --缩图宽度
* @param newHeight --缩图高度
*/
public static boolean bitmapToFile(String photoPath, File aFile, int newWidth, int newHeight) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
// 获取这个图片的宽和高
Bitmap bitmap = BitmapFactory.decodeFile(photoPath, options);
options.inJustDecodeBounds = false;
//计算缩放比
options.inSampleSize = reckonThumbnail(options.outWidth, options.outHeight, newWidth, newHeight);
bitmap = BitmapFactory.decodeFile(photoPath, options);
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] photoBytes = baos.toByteArray();
if (aFile.exists()) {
aFile.delete();
}
aFile.createNewFile();
FileOutputStream fos = new FileOutputStream(aFile);
fos.write(photoBytes);
fos.flush();
fos.close();
return true;
} catch (Exception e1) {
e1.printStackTrace();
if (aFile.exists()) {
aFile.delete();
}
Log.e("Bitmap To File Fail", e1.toString());
return false;
}
}
/**
* 计算缩放比
* @param oldWidth
* @param oldHeight
* @param newWidth
* @param newHeight
* @return
*/
public static int reckonThumbnail(int oldWidth, int oldHeight, int newWidth, int newHeight) {
if ((oldHeight > newHeight && oldWidth > newWidth)
|| (oldHeight <= newHeight && oldWidth > newWidth)) {
int be = (int) (oldWidth / (float) newWidth);
if (be <= 1)
be = 1;
return be;
} else if (oldHeight > newHeight && oldWidth <= newWidth) {
int be = (int) (oldHeight / (float) newHeight);
if (be <= 1)
be = 1;
return be;
}
return 1;
}
Android边框圆角
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schema...android">
<solid android:color="#000000" />
<corners android:topLeftRadius="10dp"
android:topRightRadius="10dp"
android:bottomRightRadius="10dp"
android:bottomLeftRadius="10dp"/>
</shape>
解释：solid的表示填充颜色,为了简单，这里用的是黑色。
而corners则是表示圆角，注意的是这里bottomRightRadius是左下角而不是右下角，bottomLeftRadius右下角。
当然上面的效果也可以像下面一样设置,如下: <corners android:radius="5dp" />