我要评论android中图片处理
用来对android中的项目图片进行处理
package com.zhanggeng.contact.tools;
import java.io.bytearrayoutputstream;
import java.io.file;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;
import android.graphics.bitmap;
import android.graphics.bitmap.config;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.colormatrix;
import android.graphics.colormatrixcolorfilter;
import android.graphics.paint;
import android.graphics.porterduff.mode;
import android.graphics.porterduffxfermode;
import android.graphics.rect;
import android.graphics.rectf;
import android.graphics.drawable.bitmapdrawable;
import android.view.viewgroup;
import android.view.animation.accelerateinterpolator;
/**
* 处理图片的工具类.
*
*/
public class imagetools {
/** */
/**
* 图片去色,返回灰度图片
*
* @param bmporiginal
* 传入的图片
* @return 去色后的图片
*/
public static bitmap tograyscale(bitmap bmporiginal) {
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 cm = new colormatrix();
cm.setsaturation(0);
colormatrixcolorfilter f = new colormatrixcolorfilter(cm);
paint.setcolorfilter(f);
c.drawbitmap(bmporiginal, 0, 0, paint);
return bmpgrayscale;
}
/** */
/**
* 去色同时加圆角
*
* @param bmporiginal
* 原图
* @param pixels
* 圆角弧度
* @return 修改后的图片
*/
public static bitmap tograyscale(bitmap bmporiginal, int pixels) {
return toroundcorner(tograyscale(bmporiginal), pixels);
}
/** */
/**
* 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;
}
/** */
/**
* 使圆角功能支持bitampdrawable
*
* @param bitmapdrawable
* @param pixels
* @return
*/
public static bitmapdrawable toroundcorner(bitmapdrawable bitmapdrawable,
int pixels) {
bitmap bitmap = bitmapdrawable.getbitmap();
bitmapdrawable = new bitmapdrawable(toroundcorner(bitmap, pixels));
return bitmapdrawable;
}
/**
* 读取路径中的图片，然后将其转化为缩放后的bitmap
*
* @param path
*/
public static void savebefore(string path) {
bitmapfactory.options options = new bitmapfactory.options();
options.injustdecodebounds = true;
// 获取这个图片的宽和高
bitmap bitmap = bitmapfactory.decodefile(path, options); // 此时返回bm为空
options.injustdecodebounds = false;
// 计算缩放比
int be = (int) (options.outheight / (float) 200);
if (be <= 0)
be = 1;
options.insamplesize = 2; // 图片长宽各缩小二分之一
// 重新读入图片，注意这次要把options.injustdecodebounds 设为 false哦
bitmap = bitmapfactory.decodefile(path, options);
int w = bitmap.getwidth();
int h = bitmap.getheight();
system.out.println(w + " " + h);
// savepng_after(bitmap,path);
savejpge_after(bitmap, path);
}
/**
* 保存图片为png
*
* @param bitmap
* @param name
*/
public static void savepng_after(bitmap bitmap, string name) {
file file = new file(name);
try {
fileoutputstream out = new fileoutputstream(file);
if (bitmap.compress(bitmap.compressformat.png, 100, out)) {
out.flush();
out.close();
}
} catch (filenotfoundexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
}
/**
* 保存图片为jpeg
*
* @param bitmap
* @param path
*/
public static void savejpge_after(bitmap bitmap, string path) {
file file = new file(path);
try {
fileoutputstream out = new fileoutputstream(file);
if (bitmap.compress(bitmap.compressformat.jpeg, 100, out)) {
out.flush();
out.close();
}
} catch (filenotfoundexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
}
/**
* 图片合成
*
* @param bitmap
* @return
*/
private bitmap createbitmap(bitmap src, bitmap watermark) {
if (src == null) {
return null;
}
int w = src.getwidth();
int h = src.getheight();
int ww = watermark.getwidth();
int wh = watermark.getheight();
// create the new blank bitmap
bitmap newb = bitmap.createbitmap(w, h, config.argb_8888);// 创建一个新的和src长度宽度一样的位图
canvas cv = new canvas(newb);
// draw src into
cv.drawbitmap(src, 0, 0, null);// 在 0，0坐标开始画入src
// draw watermark into
cv.drawbitmap(watermark, w - ww + 5, h - wh + 5, null);// 在src的右下角画入水印
// save all clip
cv.save(canvas.all_save_flag);// 保存
// store
cv.restore();// 存储
return newb;
}
// 将图片转换成byte[]以便能将其存到数据库
public static byte[] getbytefrombitmap(bitmap bitmap) {
bytearrayoutputstream out = new bytearrayoutputstream();
bitmap.compress(bitmap.compressformat.jpeg, 100, out);
try {
out.flush();
out.close();
} catch (ioexception e) {
e.printstacktrace();
// log.e(tag, "transform byte exception");
}
return out.tobytearray();
}
// 得到存储在数据库中的图片
// eg imageview.setimagebitmap(bitmapobj);
public static bitmap getbitmapfrombyte(byte[] temp) {
if (temp != null) {
bitmap bitmap = bitmapfactory.decodebytearray(temp, 0, temp.length);
return bitmap;
} else {
// bitmap bitmap=bitmapfactory.decoderesource(getresources(),
// r.drawable.contact_add_icon);
return null;
}
}
//将手机中的文件转换为bitmap类型
public static bitmap getbitemapfromfile(file f) {
if (!f.exists())
return null;
try {
return bitmapfactory.decodefile(f.getabsolutepath());
} catch (exception ex) {
return null;
}
}
//将手机中的文件转换为bitmap类型(重载+1)
public static bitmap getbitemapfromfile(string filename) {
try {
return bitmapfactory.decodefile(filename);
} catch (exception ex) {
return null;
}
}
}
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