Android图片处理

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.BitmapFactory; import android.graphics.Canvas; import android.graphics.ColorMatrix;

import android.graphics.ColorMatrixColorFilter; import android.graphics.Paint;

import android.graphics.PorterDuffXfermode; import android.graphics.Rect; import android.graphics.RectF;

import android.graphics.Bitmap.Config; import android.graphics.PorterDuff.Mode;

import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; /**

* 处理图片的工具类. */

public class imageTool {

public static final int LEFT = 0; public static final int RIGHT = 1; public static final int TOP = 3;

public static final int BOTTOM = 4;

/** */ /**

* 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(); } }

/**

* 水印 *

* @param bitmap * @return */

public static Bitmap createBitmapForWatermark(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; }

/**

* 图片合成 *

* @return */

public static Bitmap potoMix(int direction, Bitmap... bitmaps) { if (bitmaps.length <= 0) { return null; }

if (bitmaps.length == 1) {

return bitmaps[0]; }

Bitmap newBitmap = bitmaps[0];

// newBitmap = createBitmapForFotoMix(bitmaps[0],bitmaps[1],direction); for (int i = 1; i < bitmaps.length; i++) {

newBitmap = createBitmapForFotoMix(newBitmap, bitmaps[i], direction); }

return newBitmap; }

private static Bitmap createBitmapForFotoMix(Bitmap first, Bitmap second, int direction) { if (first == null) { return null; }

if (second == null) { return first; }

int fw = first.getWidth(); int fh = first.getHeight(); int sw = second.getWidth(); int sh = second.getHeight(); Bitmap newBitmap = null; if (direction == LEFT) {

newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh, Config.ARGB_8888);

Canvas canvas = new Canvas(newBitmap); canvas.drawBitmap(first, sw, 0, null); canvas.drawBitmap(second, 0, 0, null); } else if (direction == RIGHT) {

newBitmap = Bitmap.createBitmap(fw + sw, fh > sh ? fh : sh, Config.ARGB_8888);

Canvas canvas = new Canvas(newBitmap); canvas.drawBitmap(first, 0, 0, null); canvas.drawBitmap(second, fw, 0, null); } else if (direction == TOP) {

newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh, Config.ARGB_8888);

Canvas canvas = new Canvas(newBitmap); canvas.drawBitmap(first, 0, sh, null); canvas.drawBitmap(second, 0, 0, null); } else if (direction == BOTTOM) {

newBitmap = Bitmap.createBitmap(sw > fw ? sw : fw, fh + sh, Config.ARGB_8888);

Canvas canvas = new Canvas(newBitmap); canvas.drawBitmap(first, 0, 0, null); canvas.drawBitmap(second, 0, fh, null); }

return newBitmap; }

/**

* 将Bitmap转换成指定大小 *

* @param bitmap * @param width * @param height * @return */

public static Bitmap createBitmapBySize(Bitmap bitmap, int width, int height) { return Bitmap.createScaledBitmap(bitmap, width, height, true); }

/**

* Drawable 转 Bitmap *

* @param drawable * @return */

public static Bitmap drawableToBitmapByBD(Drawable drawable) { BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable; return bitmapDrawable.getBitmap(); }

/**

* Bitmap 转 Drawable *

* @param bitmap * @return */

public static Drawable bitmapToDrawableByBD(Bitmap bitmap) { Drawable drawable = new BitmapDrawable(bitmap); return drawable; }

/**

* byte[] 转 bitmap *

* @param b * @return */

public static Bitmap bytesToBimap(byte[] b) { if (b.length != 0) {

return BitmapFactory.decodeByteArray(b, 0, b.length); } else {

return null; } }

/**

* bitmap 转 byte[] *

* @param bm * @return */

public static byte[] bitmapToBytes(Bitmap bm) {

ByteArrayOutputStream baos = new ByteArrayOutputStream(); bm.compress(Bitmap.CompressFormat.PNG, 100, baos); return baos.toByteArray(); } }