Android图片处理工具类(圆角,压缩)

2021-09-24 14:24:03 浏览数 (1)

工作中用到的图片处理工具类,简单写下来,以便备用!

代码语言:javascript复制
public class BitmapUtils {

/**
 * 图像背景圆角处理
 * bitmap要处理的图片 roundPx 图片弯角的圆度一般是5到10之间
 */
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
    // 创建与原图大小一样的bitmap文件,Config.ARGB_8888根据情况可以改用其它的
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
    // 实例画布,绘制的bitmap将保存至output中
    Canvas canvas = new Canvas(output);
    final int color = 0xff424242;//写自己需要的颜色值
    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(android.graphics.PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);
    bitmap.recycle();
    bitmap = null;
    return output;
}

/**
 * bitmap缩放
 * width要缩放的宽度 height要缩放的高度
 */
public static Bitmap getBitmapDeflation(Bitmap bitmap, int width, int height, boolean recycle) {

    if (null == bitmap) {

      return null;

      }
    float scaleWidth = 0f;
    float scaleHeight = 0f;
    // 获取bitmap宽高
    int bitmapWidth = bitmap.getWidth();
    int bitmapHeight = bitmap.getHeight();
    // 计算缩放比,图片的宽高小于指定的宽高则不缩放
    if (width < bitmapWidth) {
        scaleWidth = ((float) width) / bitmapWidth;
    } else {
        scaleWidth = 1.00f;
    }
    if (height < bitmapHeight) {
        scaleHeight = ((float) height) / bitmapHeight;
    } else {
        scaleHeight = 1.00f;
    }
    Matrix matrix = new Matrix();
    matrix.postScale(scaleWidth, scaleHeight);

    Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmapWidth, bitmapHeight, matrix, true);
    if (recycle && !bitmap.isRecycled()) {
        bitmap.recycle();
    }
    bitmap = null;

    return newBitmap;
}

/**
 *
 * 方法概述:进入图片的大小与质量压缩,用于区分大小图片
 */
public static Bitmap getCompressedImage(String srcPath) {
    BitmapFactory.Options newOpts = new BitmapFactory.Options();
    // 开始读入图片,此时把options.inJustDecodeBounds 设回true了
    newOpts.inPreferredConfig = Bitmap.Config.RGB_565;
    newOpts.inPurgeable = true;
    newOpts.inJustDecodeBounds = true;
    FileInputStream is = null;
    try {
        is = new FileInputStream(srcPath);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    Bitmap bitmap = BitmapFactory.decodeStream(is, null, newOpts);// 此时返回bm为空
    newOpts.inJustDecodeBounds = false;
    int w = newOpts.outWidth;
    int h = newOpts.outHeight;
    // 现在主流手机比较多是800*480分辨率,所以高和宽我们设置为
    float hh = 130f;// 这里设置高度为800f
    float ww = 130f;// 这里设置宽度为480f
    // 缩放比。由于是固定比例缩放,只用高或者宽其中一个数据进行计算即可
    int be = 1;// be=1表示不缩放
    if (w > h && w > ww) {// 如果宽度大的话根据宽度固定大小缩放
        be = (int) (newOpts.outWidth / ww);
    } else if (w < h && h > hh) {// 如果高度高的话根据宽度固定大小缩放
        be = (int) (newOpts.outHeight / hh);
    }
    if (be <= 0) {
        be = 1;
    }
    newOpts.inSampleSize = be;// 设置缩放比例
    // 重新读入图片,注意此时已经把options.inJustDecodeBounds 设回false了
    bitmap = BitmapFactory.decodeFile(srcPath, newOpts);
    if (bitmap != null) { return compressImageSize(bitmap, 8);// 压缩好比例大小后再进行质量压缩
    }
    return null;
}

/**
 *
 * 方法概述:图片质量压缩
 */
protected static Bitmap compressImageSize(Bitmap image, int size) {
    if (image == null)
        return image;

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 质量压缩方法,这里10表示不压缩,把压缩后的数据存放到baos中
    int options = 100;
    while (baos.toByteArray().length / 1000 > size && options / 3 > 0) { // 循环判断如果压缩后图片是否大于10kb,大于继续压缩
        baos.reset();// 重置baos即清空baos
        image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 这里压缩options%,把压缩后的数据存放到baos中
        options -= options / 3;// 每次都减少30%
    }

    ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());// 把压缩后的数据baos存放到ByteArrayInputStream中
    Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);// 把ByteArrayInputStream数据生成图片
    return bitmap;
}

/**
 *
 * 方法概述:保存图片
 */
public static String saveBitmapWithName(String path, String bitName, Bitmap mBitmap) {
    File f = new File(path   bitName   ".png");
    String url = path   bitName   ".png";
    try {
        f.createNewFile();
    } catch (IOException e) {
        System.out.println("文件创建出错");
    }
    FileOutputStream fOut = null;
    try {
        fOut = new FileOutputStream(f);
    } catch (FileNotFoundException e) {
        System.out.println(" 创建文件流失败");
        e.printStackTrace();
    }
    mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
    try {
        fOut.flush();
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        fOut.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return url;
}

/**
 *
 * 方法概述:根据传入参数保存图片
 */
public static boolean saveImageTo(Bitmap photo, String spath) {
    try {
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(spath, false));
        photo.compress(Bitmap.CompressFormat.PNG, 100, bos);
        bos.flush();
        bos.close();
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
    return true;
}

 
}
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