android - 如何从android打开默认图库并接收图片的选择uri？

Question

是否可以从代码中调用默认图库，以便向用户显示其图库的所有图片以选择一张图片。因此，我需要接收所选图片的路径，以便我可以对其进行处理。

谢谢

Answer 1

使用以下代码创建并触发启动图库的意图

Intent pickPhoto = new Intent(Intent.ACTION_PICK,
                                       android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                            startActivityForResult(pickPhoto , 0);

和下面的onActivityResult(int requestCode, int resultCode, Intent data)方法来获取 URI

Uri dataUri = data.getData(); //Image URI

您很可能需要以下方法将此 Image URI 转换为小尺寸位图。如果在您的显示器中显示图像，如果没有它，可能会导致 OOM 异常

private Bitmap decodeUri(Uri selectedImage) throws FileNotFoundException {

    // Decode image size
    BitmapFactory.Options o = new BitmapFactory.Options();
    o.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o);

    // The new size we want to scale to
    final int REQUIRED_SIZE = 140;

    // Find the correct scale value. It should be the power of 2.
    int width_tmp = o.outWidth, height_tmp = o.outHeight;
    int scale = 1;
    while (true) {
        if (width_tmp / 2 < REQUIRED_SIZE
           || height_tmp / 2 < REQUIRED_SIZE) {
            break;
        }
        width_tmp /= 2;
        height_tmp /= 2;
        scale *= 2;
    }

    // Decode with inSampleSize
    BitmapFactory.Options o2 = new BitmapFactory.Options();
    o2.inSampleSize = scale;
    return BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, o2);

}