Android中URL转换成二维码的实现方法

public static boolean createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) {
  try {
   if (content == null || "".equals(content)) {
    return false;
   }

   //配置参数
   Map hints = new HashMap<>();
   hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
   //容错级别
   hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
   //设置空白边距的宽度
   hints.put(EncodeHintType.MARGIN, 2); //default is 4

   // 图像数据转换，使用了矩阵转换
   BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints);
   int[] pixels = new int[widthPix * heightPix];
   // 下面这里按照二维码的算法，逐个生成二维码的图片，
   // 两个for循环是图片横列扫描的结果
   for (int y = 0; y < heightPix; y++) {
    for (int x = 0; x < widthPix; x++) {
     if (bitMatrix.get(x, y)) {
      pixels[y * widthPix + x] = 0xff000000;
     } else {
      pixels[y * widthPix + x] = 0xffffffff;
     }
    }
   }

   // 生成二维码图片的格式，使用ARGB_8888
   Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);
   bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);

   if (logoBm != null) {
    bitmap = addLogo(bitmap, logoBm);
   }

   //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！
   return bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath));
  } catch (WriterException | IOException e) {
   e.printStackTrace();
  }

  return false;
 }

private static Bitmap addLogo(Bitmap src, Bitmap logo) {
  if (src == null) {
   return null;
  }

  if (logo == null) {
   return src;
  }

  //获取图片的宽高
  int srcWidth = src.getWidth();
  int srcHeight = src.getHeight();
  int logoWidth = logo.getWidth();
  int logoHeight = logo.getHeight();

  if (srcWidth == 0 || srcHeight == 0) {
   return null;
  }

  if (logoWidth == 0 || logoHeight == 0) {
   return src;
  }

  //logo大小为二维码整体大小的1/5
  float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;
  Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
  try {
   Canvas canvas = new Canvas(bitmap);
   canvas.drawBitmap(src, 0, 0, null);
   canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);
   canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);

   canvas.save(Canvas.ALL_SAVE_FLAG);
   canvas.restore();
  } catch (Exception e) {
   bitmap = null;
   e.getStackTrace();
  }

  return bitmap;
 }

private static String getFileRoot(Context context) {
  if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
   File external = context.getExternalFilesDir(null);
   if (external != null) {
    return external.getAbsolutePath();
   }
  }

  return context.getFilesDir().getAbsolutePath();
 }

public class SPUtil {

 private static final String CONFIG = "config";

 /**
  * 获取SharedPreferences实例对象
  *
  * @param fileName
  */
 private static SharedPreferences getSharedPreference(String fileName) {
  return QRCodeApplication.getInstance().getSharedPreferences(fileName, Context.MODE_PRIVATE);
 }

 /**
  * 保存一个String类型的值！
  */
 public static void putString(String key, String value) {
  SharedPreferences.Editor editor = getSharedPreference(CONFIG).edit();
  editor.putString(key, value).apply();
 }

 /**
  * 获取String的value
  */
 public static String getString(String key, String defValue) {
  SharedPreferences sharedPreference = getSharedPreference(CONFIG);
  return sharedPreference.getString(key, defValue);
 }

}

public static void showThreadImage(final Activity mContext, final String text, final ImageView imageView, final int centerPhoto) {
  String preContent = SPUtil.getString("share_code_content", "");
  if (text.equals(preContent)) {
   String preFilePath = SPUtil.getString("share_code_filePath", "");
   imageView.setImageBitmap(BitmapFactory.decodeFile(preFilePath));

  } else {
   SPUtil.putString("share_code_content", text);
   final String filePath = getFileRoot(mContext) + File.separator + "qr_" + System.currentTimeMillis() + ".jpg";
   SPUtil.putString("share_code_filePath", filePath);

   //二维码图片较大时，生成图片、保存文件的时间可能较长，因此放在新线程中
   new Thread(new Runnable() {
    @Override
    public void run() {
     boolean success = QRCodeUtil.createQRImage(text, 800, 800, BitmapFactory.decodeResource(mContext.getResources(), centerPhoto),
       filePath);

     if (success) {
      mContext.runOnUiThread(new Runnable() {
       @Override
       public void run() {
        imageView.setImageBitmap(BitmapFactory.decodeFile(filePath));
       }
      });
     }
    }
   }).start();
  }
 }

public class ContentActivity extends AppCompatActivity implements View.OnClickListener {

 private EditText etUrl;

 private Button btnConvert;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_content);

  initView();
 }

 private void initView() {
  etUrl = (EditText) findViewById(R.id.et_url);
  btnConvert = (Button) findViewById(R.id.btn_convert);

  btnConvert.setOnClickListener(this);

 }

 @Override
 public void onClick(View v) {
  switch (v.getId()) {
   case R.id.btn_convert:
    String str_url = "https://" + etUrl.getText().toString();
    Bundle bundle = new Bundle();
    bundle.putString("url", str_url);
    // 当输入框为空时，提示用户
    if (str_url.equals("https://")) {
     Toast.makeText(getApplicationContext(), "输入框不能为空", Toast.LENGTH_SHORT).show();
    } else {
     Intent intent = new Intent(ContentActivity.this, MainActivity.class);
     intent.putExtras(bundle);
     startActivity(intent);
    }
    break;
   default:
    break;
  }
 }
}

public class MainActivity extends AppCompatActivity {

 private ImageView iv;

// private String url = "http://weibo.com/cnwutianhao";

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  String str_url = getIntent().getExtras().getString("url");

  iv = (ImageView) findViewById(R.id.iv_qrcode);

  QRCodeUtil.showThreadImage(this, str_url, iv, R.mipmap.ic_launcher);
 }
}

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