Android如何实现URL转换成二维码

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<EncodeHintType, Object> 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);  }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical"  android:padding="10dp">  <EditText    android:id="@+id/et_url"    android:layout_width="match_parent"    android:layout_height="50dp"    android:layout_marginTop="100dp"    android:hint="请输入网址"    android:inputType="textUri" />  <Button    android:id="@+id/btn_convert"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_alignParentBottom="true"    android:layout_centerHorizontal="true"    android:layout_marginBottom="20dp"    android:text="转换成二维码" /></RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.tnnowu.android.qrcode.MainActivity">  <ImageView    android:id="@+id/iv_qrcode"    android:layout_width="220dp"    android:layout_height="220dp"    android:layout_centerInParent="true"    android:layout_marginTop="40dp"    android:background="#FFFFFF" /></RelativeLayout>