Android 将相机预览帧数据转化成bitmap保存成图片

首先格式化成YUV格式

 try {
            //格式成YUV格式
            YuvImage yuvimage = new YuvImage(data, ImageFormat.NV21, camera.getParameters().getPreviewSize().width,
                    camera.getParameters().getPreviewSize().height, null);
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            yuvimage.compressToJpeg(new Rect(0, 0, camera.getParameters().getPreviewSize().width,
                    camera.getParameters().getPreviewSize().height), 100, baos);
            Bitmap bitmap = bytes2Bimap(baos.toByteArray());
            Log.i(TAG, "onNext: " + bitmap);
            saveImage(bitmap);
        } catch (Exception e) {
            e.printStackTrace();
        }

转换成Bitmap

public Bitmap bytes2Bimap(byte[] b) {
    if (b.length != 0) {
        return BitmapFactory.decodeByteArray(b, 0, b.length);
    } else {
        return null;
    }
}

保存在pic目录下

public void saveImage(Bitmap bmp) {
    File appDir = new File(Environment.getExternalStorageDirectory(), "pic");
    if (!appDir.exists()) {
        appDir.mkdir();
    }
    String fileName = System.currentTimeMillis() + ".jpg";
    File file = new File(appDir, fileName);
    try {
        FileOutputStream fos = new FileOutputStream(file);
        bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);
        fos.flush();
        fos.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

附带图片压缩方法

private Bitmap getBitmap(String path){
   try {
       FileInputStream is = new FileInputStream(path);
       BitmapFactory.Options options = new BitmapFactory.Options();
       options.inTempStorage = new byte[100 * 1024];
       options.inPreferredConfig = Bitmap.Config.RGB_565;
       options.inPurgeable = true;
       options.inSampleSize = 4;
       options.inInputShareable = true;
       return BitmapFactory.decodeStream(is, null, options);
   } catch (FileNotFoundException e) {
       e.printStackTrace();
   }
   return null;
}

图片镜像旋转方法

public static Bitmap convert(Bitmap bitmap, boolean mIsFrontalCamera) {
    int w = bitmap.getWidth();
    int h = bitmap.getHeight();
    Bitmap newbBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);// 创建一个新的和SRC长度宽度一样的位图
    Canvas cv = new Canvas(newbBitmap);
    android.graphics.Matrix m = new android.graphics.Matrix();
     m.postScale(1, -1); //镜像垂直翻转
    if (mIsFrontalCamera) {
        m.postScale(-1, 1); // 镜像水平翻转
    }
    // m.postRotate(-90); //旋转-90度
    Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, w, h, m, true);
    cv.drawBitmap(bitmap2,
            new Rect(0, 0, bitmap2.getWidth(), bitmap2.getHeight()),
            new Rect(0, 0, w, h), null);
    return newbBitmap;
}