Android 中的 PNG 图片和 InputStream

Question

I need to decode an .png image to use it as a base to create some Rects and to use the image itself as a background for my application, but the try-catch keeps throwing me a Null Pointer Exception, this is the code:

    try {

        InputStream is = ParamsSingleton.assetManager.open("background.png");
        figure = BitmapFactory.decodeStream(is);

        height = figure.getHeight();
        width = figure.getWidth();

        src = new Rect(0, 0, width, height);
        first = new Rect();

    } catch (IOException e) {
        Log.d(TAG, "Image decode fail!");

    }

I've tried some logs and the try-catch break right on the InputStream line and prints the 'Log.d' in catch block, I checked the file name and it is alright.

Answer 1

您可以直接在decodeStream使用getAssets.open方法。

figure = BitmapFactory.decodeStream(getAssets.open("background.png"));