Android --- 图片处理的方法

package com.img.util;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.LinearGradient;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.PixelFormat;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.Shader.TileMode;import android.graphics.drawable.Drawable;public class ImgUtil {    // 放大缩小图片    public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {        int width = bitmap.getWidth();        int height = bitmap.getHeight();        Matrix matrix = new Matrix();        float scaleWidth = ((float) w / width);        float scaleHeight = ((float) h / height);        matrix.postScale(scaleWidth, scaleHeight);        Bitmap newBmp = Bitmap.createBitmap(bitmap, 0, 0, width, height,                matrix, true);        return newBmp;    }    // 将Drawable转化为Bitmap    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;    }    // 圆角图片    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {        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);        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;    }    // 获得带倒影的图片方法    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);        // Set the Transfer mode to be porter duff and destination in        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));        // Draw a rectangle using the paint with our linear gradient        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()                + reflectionGap, paint);        return bitmapWithReflection;    }}

package com.img.util;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.widget.ImageView;public class MainActivity extends Activity {    private ImageView mImageView01, mImageView02;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        setupViews();    }    private void setupViews() {        mImageView01 = (ImageView) findViewById(R.id.image01);        mImageView02 = (ImageView) findViewById(R.id.image02);        // 获取壁纸返回值是Drawable        Drawable drawable = getWallpaper();        // 将Drawable转化为Bitmap        Bitmap bitmap = ImgUtil.drawableToBitmap(drawable);        // 缩放图片        Bitmap zoomBitmap = ImgUtil.zoomBitmap(bitmap, 100, 100);        // 获取圆角图片        Bitmap roundBitmap = ImgUtil                .getRoundedCornerBitmap(zoomBitmap, 10.0f);        // 获取倒影图片        Bitmap reflectBitmap = ImgUtil                .createReflectionImageWithOrigin(zoomBitmap);        // 这里可以让Bitmap再转化为Drawable        // Drawable roundDrawable = new BitmapDrawable(roundBitmap);        // Drawable reflectDrawable = new BitmapDrawable(reflectBitmap);        // mImageView01.setBackgroundDrawable(roundDrawable);        // mImageView02.setBackgroundDrawable(reflectDrawable);        mImageView01.setImageBitmap(roundBitmap);        mImageView02.setImageBitmap(reflectBitmap);    }}

1.图片加载方法，方便用户加载图片

/***
* 加载本地图片
* @param context：主运行函数实例
* @param bitAdress：图片地址，一般指向R下的drawable目录
* @return
*/

public final Bitmap CreatImage(Context context, int bitAdress) {
Bitmap bitmaptemp = null;
bitmaptemp = BitmapFactory.decodeResource(context.getResources(),
bitAdress);
return bitmaptemp;
}

2.图片平均分割方法，将大图平均分割为N行N列，方便用户使用

/***
* 图片分割
*
* @param g
* ：画布

* @param paint
* ：画笔

* @param imgBit
* ：图片

* @param x
* ：X轴起点坐标

* @param y
* ：Y轴起点坐标

* @param w
* ：单一图片的宽度

* @param h
* ：单一图片的高度

* @param line
* ：第几列

* @param row
* ：第几行

*/

public final void cuteImage(Canvas g, Paint paint, Bitmap imgBit, int x,
int y, int w, int h, int line, int row) {
g.clipRect(x, y, x + w, h + y);
g.drawBitmap(imgBit, x – line * w, y – row * h, paint);
g.restore();
}

3.图片缩放，对当前图片进行缩放处理

/***
* 图片的缩放方法
*

* @param bgimage
* ：源图片资源

* @param newWidth
* ：缩放后宽度
* @param newHeight

* ：缩放后高度
* @return

*/

public Bitmap zoomImage(Bitmap bgimage, int newWidth, int newHeight) {

// 获取这个图片的宽和高

int width = bgimage.getWidth();
int height = bgimage.getHeight();

// 创建操作图片用的matrix对象

Matrix matrix = new Matrix();

// 计算缩放率，新尺寸除原始尺寸

float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;

// 缩放图片动作

matrix.postScale(scaleWidth, scaleHeight);
Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
matrix, true);
return bitmap;

}

4.绘制带有边框的文字，一般在游戏中起文字的美化作用

/***

* 绘制带有边框的文字
*
* @param strMsg
* ：绘制内容
* @param g
* ：画布

* @param paint
* ：画笔

* @param setx
* ：：X轴起始坐标

* @param sety
* ：Y轴的起始坐标

* @param fg
* ：前景色

* @param bg
* ：背景色

*/

public void drawText(String strMsg, Canvas g, Paint paint, int setx,
int sety, int fg, int bg) {
paint.setColor(bg);
g.drawText(strMsg, setx + 1, sety, paint);
g.drawText(strMsg, setx, sety – 1, paint);
g.drawText(strMsg, setx, sety + 1, paint);
g.drawText(strMsg, setx – 1, sety, paint);
paint.setColor(fg);
g.drawText(strMsg, setx, sety, paint);
g.restore();

}

5.Android 图片透明度处理代码

/**
* 图片透明度处理
*
* @param sourceImg
*            原始图片
* @param number
*            透明度
* @return
*/
public static Bitmap setAlpha(Bitmap sourceImg, int number) {
int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()];
sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 获得图片的ARGB值
number = number * 255 / 100;
for (int i = 0; i < argb.length; i++) {
argb = (number << 24) | (argb & 0×00FFFFFF);// 修改最高2位的值
}
sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888);

return sourceImg;
}

6.图片翻转

Resources res = this.getContext().getResources();
img = BitmapFactory.decodeResource(res, R.drawable.slogo);
Matrix matrix = new Matrix();
matrix.postRotate(90);        /*翻转90度*/
int width = img.getWidth();
int height = img.getHeight();
r_img = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);