Java 更改图像的图片大小/分辨率\u捕获意图

是否可以更改拍照意图的设置以设置结果图像的大小或分辨率

现在我用16MP和4608x2304拍摄了一张照片

我想知道是否有可能得到结果图像，例如： 2MP和460x230

我知道有这样的方法：

intent.putExtra("outputX", 460);
intent.putExtra("outputY", 230);

但我正在寻找一种适用于所有设备的东西（因为它们的图像大小都不一样，如果我用硬编码的值裁剪它们，那就糟了）

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希望你能理解我的问题是什么

您需要拍摄照片而不将其保存在文件中：

static final int REQUEST_IMAGE_CAPTURE = 1;

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

之后，您需要通过保存纵横比来缩放结果位图：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        Bitmap imageBitmap = (Bitmap) extras.get("data");
        Bitmap scaledImage = scaleBitmap(imageBitmap , 460, 230);
        mImageView.setImageBitmap(scaledImage);
    }
}

private Bitmap scaleBitmap(Bitmap bm, int maxWidth, int maxHeight) {
    int width = bm.getWidth();
    int height = bm.getHeight();

    if (width > height) {
        // landscape
        int ratio = width / maxWidth;
        width = maxWidth;
        height = height / ratio;
    } else if (height > width) {
        // portrait
        int ratio = height / maxHeight;
        height = maxHeight;
        width = width / ratio;
    } else {
        // square
        height = maxHeight;
        width = maxWidth;
    }

    bm = Bitmap.createScaledBitmap(bm, width, height, true);
    return bm;
}

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您需要拍摄照片而不将其保存在文件中：

static final int REQUEST_IMAGE_CAPTURE = 1;

private void dispatchTakePictureIntent() {
    Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
    }
}

之后，您需要通过保存纵横比来缩放结果位图：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
        Bundle extras = data.getExtras();
        Bitmap imageBitmap = (Bitmap) extras.get("data");
        Bitmap scaledImage = scaleBitmap(imageBitmap , 460, 230);
        mImageView.setImageBitmap(scaledImage);
    }
}

private Bitmap scaleBitmap(Bitmap bm, int maxWidth, int maxHeight) {
    int width = bm.getWidth();
    int height = bm.getHeight();

    if (width > height) {
        // landscape
        int ratio = width / maxWidth;
        width = maxWidth;
        height = height / ratio;
    } else if (height > width) {
        // portrait
        int ratio = height / maxHeight;
        height = maxHeight;
        width = width / ratio;
    } else {
        // square
        height = maxHeight;
        width = maxWidth;
    }

    bm = Bitmap.createScaledBitmap(bm, width, height, true);
    return bm;
}

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必须使用浮点数获取比率，如果maxWidth或maxHeigh大于高度或宽度，则比率将为0并引发异常。必须使用浮点数获取比率，如果maxWidth或maxHeigh大于高度或宽度，则比率将为0并引发异常。