调用系统Intent剪裁图片
/**
* 调用系统Intent剪裁图片
* @param context
* @param uri
* @param w
* @param h
*/
public static void startPhotoZoom(Activity context,Uri uri, int w,int h) {Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
// crop为true是设置在开启的intent中设置显示的view可以剪裁
intent.putExtra("crop", "true");// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", w);
intent.putExtra("aspectY", h);// outputX,outputY 是剪裁图片的宽高
intent.putExtra("outputX", w);
intent.putExtra("outputY", h);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(fileName)));
intent.putExtra("return-data", false);//若为false则表示不返回数据
context.startActivityForResult(intent, PHOTO_REQUEST_CUT);
}
裁剪成正方形图片：
/**
* 按正方形裁切图片
*/
public static Bitmap ImageCrop(Bitmap bitmap) {
if(bitmap == null)
return null;
int w = bitmap.getWidth(); // 得到图片的宽，高
int h = bitmap.getHeight();int wh = w > h ? h : w;// 裁切后所取的正方形区域边长
int retX = w > h ? (w - h) / 2 : 0;//基于原图，取正方形左上角x坐标
int retY = w > h ? 0 : (h - w) / 2;//下面这句是关键
Bitmap bit = Bitmap.createBitmap(bitmap, retX, retY, wh, wh, null, false);
return bit;
}
裁剪成圆形图片：
/**
* 转换图片成圆形
*
* @param bitmap
* 传入Bitmap对象
* @return
*/
public static Bitmap toRoundBitmap(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float roundPx;
float left, top, right, bottom, dst_left, dst_top, dst_right, dst_bottom;
if (width <= height) {
roundPx = width / 2;
top = 0;
bottom = width;
left = 0;
right = width;
height = width;
dst_left = 0;
dst_top = 0;
dst_right = width;
dst_bottom = width;
} else {
roundPx = height / 2;
float clip = (width - height) / 2;
left = clip;
right = width - clip;
top = 0;
bottom = height;
width = height;
dst_left = 0;
dst_top = 0;
dst_right = height;
dst_bottom = height;
}Bitmap output = Bitmap.createBitmap(width, height, Config.ARGB_8888);
Canvas canvas = new Canvas(output);final int color = 0xff424242;
final Paint paint = new Paint();
final Rect src = new Rect((int) left, (int) top, (int) right,
(int) bottom);
final Rect dst = new Rect((int) dst_left, (int) dst_top,
(int) dst_right, (int) dst_bottom);
final RectF rectF = new RectF(dst);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, src, dst, paint);
return output;
}