先在androidstudio上匯入libzing的Module，然後再app上把那個libzing新增上去，這樣我們的app就關聯了那個libzing庫了

然後我們就只在app這個工程下寫程式碼就行了。activity_main.xml佈局如下

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation
 
="vertical"
    tools:context="com.example.edu.myqrcode.MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="start scan"
        android:onClick="scan"/>
    <TextView
        android:layout_width="match_parent"
 

        android:layout_height="wrap_content"
        android:text="Ruselt"
        android:textSize="26sp"/>

    <TextView
        android:id="@+id/tv_ruselt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="26sp"/>
    <EditText
        android:id="@+id/et_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="make"
        android:text="make QRCode"/>
    <CheckBox
        android:id="@+id/is_logo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="check"/>
    <ImageView
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"
        android:layout_gravity="center"/>
</LinearLayout>

Mainactivity.java

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import com.xys.libzxing.zxing.activity.CaptureActivity;
import com.xys.libzxing.zxing.encoding.EncodingUtils;

public class MainActivity extends Activity {
    private TextView mTv_Ruslet;
    private EditText mInput;
    private ImageView mImg;
    private CheckBox isLogo;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTv_Ruslet= (TextView) findViewById(R.id.tv_ruselt);
        mInput= (EditText) findViewById(R.id.et_text);
        mImg= (ImageView) findViewById(R.id.img);
        isLogo= (CheckBox) findViewById(R.id.is_logo);
    }

    /**
     *生成二維碼
     */
    public void make(View view){
        String input=mInput.getText().toString().trim();
        //生成二維碼，然後為二維碼增加logo
        Bitmap bitmap=EncodingUtils.createQRCode(input,500,500,
                isLogo.isChecked()? BitmapFactory.decodeResource(getResources(),
                        R.mipmap.ic_launcher):null
                );
        mImg.setImageBitmap(bitmap);
    }

    /**
     *  掃描二維碼
     */
    public void scan(View view){
        startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class),0);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //Log.i("TAG","resultCode: "+resultCode+" result_ok: "+RESULT_OK);
        if (resultCode==RESULT_OK){
            Bundle bundle=data.getExtras();
            String result= bundle.getString("result");
            mTv_Ruslet.setText(result);
        } if(resultCode == RESULT_CANCELED) {
            mTv_Ruslet.setText("掃描出錯");
        }
    }
}

執行結果：掃描跟生成二維碼都是ok的