//傳入的參數(shù)為bitmap

private Bitmap compressImage(Bitmap image) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    // 第一次壓縮，質(zhì)量為 100（不壓縮）
    image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    int options = 100;
    // 循環(huán)壓縮直到滿足條件
    while (baos.toByteArray().length / 1024 > 100) {
        baos.reset();
        image.compress(Bitmap.CompressFormat.JPEG, options, baos);
        options -= 10;
    }
    // 生成壓縮后的 Bitmap
    ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
    return BitmapFactory.decodeStream(isBm);
}

//傳入的參數(shù)為圖片的路徑

private Bitmap getimage(String srcPath) {
    BitmapFactory.Options newOpts = new BitmapFactory.Options();
    // 僅讀取圖片的寬高，不加載圖片到內(nèi)存
    newOpts.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(srcPath, newOpts);
    newOpts.inJustDecodeBounds = false;
    // 根據(jù)需求計(jì)算采樣率
    int w = newOpts.outWidth;
    int h = newOpts.outHeight;
    float hh = 1280f; // 目標(biāo)高度
    float ww = 720f; // 目標(biāo)寬度
    int be = 1;
    // 根據(jù)寬度或高度計(jì)算采樣率
    if (w > h && w > ww) {
        be = (int) (w / ww);
    } else if (h > w && h > hh) {
        be = (int) (h / hh);
    }
    newOpts.inSampleSize = be;
    // 重新加載圖片
    return BitmapFactory.decodeFile(srcPath, newOpts);
}

//傳入的參數(shù)為bitmpa，還有需要保存文件的路徑


public static void compressBitmapToFile(Bitmap bmp, File file) {
    int ratio = 2; // 縮放比例
    // 創(chuàng)建縮放后的 Bitmap
    Bitmap result = Bitmap.createBitmap(bmp.getWidth() / ratio, 
                                       bmp.getHeight() / ratio, 
                                       Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(result);
    Rect rect = new Rect(0, 0, bmp.getWidth() / ratio, bmp.getHeight() / ratio);
    canvas.drawBitmap(bmp, null, rect, null);

    // 壓縮并保存到文件
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    result.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    try {
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(baos.toByteArray());
        fos.flush();
        fos.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static Bitmap compressBitmap(Bitmap bmp) {
    int ratio = 2; // 縮放比例
    // 創(chuàng)建縮放后的 Bitmap
    Bitmap result = Bitmap.createBitmap(
        bmp.getWidth() / ratio, 
        bmp.getHeight() / ratio, 
        Bitmap.Config.ARGB_8888
    );
    Canvas canvas = new Canvas(result);
    Rect rect = new Rect(0, 0, bmp.getWidth() / ratio, bmp.getHeight() / ratio);
    canvas.drawBitmap(bmp, null, rect, null);
    return result; // 直接返回縮放后的 Bitmap
}