//AndroidX 版本
implementation 'com.king.zxing:zxing-lite:1.1.7-androidx'

<activity
 android:name="com.king.zxing.CaptureActivity"
 android:screenOrientation="fullSensor"
 android:theme="@style/CaptureTheme" />

import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.king.zxing.CaptureActivity;
import com.king.zxing.util.CodeUtils;

import org.json.JSONObject;

import static com.king.zxing.CaptureFragment.KEY_RESULT;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

 protected EditText edtResutlt;
 protected Button btnScan;
 protected Button btnCreate;
 protected EditText edtData;
 protected ImageView ivQr;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 super.setContentView(R.layout.activity_main);
 PermissionUtils.applyPermission(this);
 initView();
 }

 @Override
 public void onClick(View view) {
 if (view.getId() == R.id.btn_scan) {
  //跳转到扫描界面
  Intent intent = new Intent(this, CaptureActivity.class);
  startActivityForResult(intent, 1);
 } else if (view.getId() == R.id.btn_create) {
  String data = edtData.getText().toString().trim();
  if (TextUtils.isEmpty(data)) {
  Toast.makeText(this, "请输入文字", Toast.LENGTH_SHORT).show();
  } else {
  //生成二维码
  Bitmap qrCode = CodeUtils.createQRCode(data, 600, null);
  ivQr.setImageBitmap(qrCode);
  }
 }
 }

 /**
 * 在该方法中拿到扫描的数据
 * @param requestCode
 * @param resultCode
 * @param data
 */
 @Override
 protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
 super.onActivityResult(requestCode, resultCode, data);
 if (resultCode == RESULT_OK) {
  if (requestCode == 1) {
  String result = data.getStringExtra(KEY_RESULT);
  Log.e("aaa", "resu-->" + result);
  //展示到页面上
  edtResutlt.setText(result);
  }
 }
 }

 private void initView() {
 edtResutlt = (EditText) findViewById(R.id.edt_resutlt);
 btnScan = (Button) findViewById(R.id.btn_scan);
 btnScan.setOnClickListener(MainActivity.this);
 btnCreate = (Button) findViewById(R.id.btn_create);
 btnCreate.setOnClickListener(MainActivity.this);
 edtData = (EditText) findViewById(R.id.edt_data);
 ivQr = (ImageView) findViewById(R.id.iv_qr);
 }
}