android - 另一个类中的错误 getResource()

Question

这段代码不在mainActivity类中

错误:

 cannot find symbol method getResources()

代码:

public void printPhoto(int img) {

        try {
            Bitmap bmp = BitmapFactory.decodeResource(getResources(),
                    img);
            if(bmp!=null){
                byte[] boleh = Utils.decodeBitmap(bmp);
                mmOutputStream.write(PrinterCommands.ESC_ALIGN_CENTER);
                printText(boleh);
            }else{
                Log.e("Print Photo error", "the file isn't exists");
            }

        } catch (Exception e) {
            e.printStackTrace();
            Log.e("PrintTools", "the file isn't exists");
        }

    }

All of my function and method in another class. In my MainActivity just for button and listener. how to solve this. I am beginner in android studio. thanks

Answer 1

你应该通过 Context .

代码

public void printPhoto(Context ctx,int img) {

    try {
        Bitmap bmp = BitmapFactory.decodeResource(ctx.getResources(),
                img);

调用

printPhoto(YourActivityName.this, R.drawable.your_image); // For Activity
printPhoto(getActivity(), R.drawable.your_image); // For Fragment