Android加载二维码

Android加载二维码

效果图

布局文件中添加ImageView组件,用来存放二维码

public class ErWeiMa extends BaseActivity {
    private ImageView imageView4;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initView();
    }

    private void initView() {
        imageView4 = findViewById(R.id.imageView4);
        Bitmap bitmap = setBitMap("I love you", 400, 400);
        imageView4.setImageBitmap(bitmap);
    }

    public Bitmap setBitMap(String string, int width, int height) {
        QRCodeWriter writer = new QRCodeWriter();
        Map<EncodeHintType, String> map = new HashMap<>();
        map.put(EncodeHintType.CHARACTER_SET, "utf-8");
        try {
            BitMatrix encode = writer.encode(string, BarcodeFormat.QR_CODE, width, height, map);
            int[] ints = new int[width * height];
            for (int i = 0; i < width; i++) {
                for (int j = 0; j < height; j++) {
                    if (encode.get(i, j)) {
                        ints[i * width + j] = 0x00000000;

                    } else {
                        ints[i * width + j] = 0xffffffff;
                    }
                }
            }
            return Bitmap.createBitmap(ints, 0, width, width, height, Bitmap.Config.RGB_565);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected int getLayout() {
        return R.layout.activity_erweima;
    }
}