<Button
        android:id="@+id/btn_scan"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="掃描二維碼"
        android:onClick="onClickBtn"
        />
    <Button
        android:id="@+id/btn_produce"
        android:layout_width="match_parent"
 

        android:layout_height="wrap_content"
        android:text="生成二維碼"
        android:onClick="onClickBtn"
        />
    <Button
        android:id="@+id/btn_produce_logo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="生成帶logo的二維碼"
 

        android:onClick="onClickBtn"
        />
    <ImageView
        android:id="@+id/img_icon"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:src="@mipmap/ic_launcher"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
 

        />

3.Mainactivity程式碼

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

import com.zxing.activity.CaptureActivity;
import com.zxing.encoding.EncodingHandler;

public class MainActivity extends AppCompatActivity {

    private ImageView imgIcon;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imgIcon = (ImageView) findViewById(R.id.img_icon);
    }

    public void onClickBtn(View view) {
        switch (view.getId()) {
            case R.id.btn_scan://掃描二維碼
                Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
                startActivityForResult(intent,1609);
                break;
            case R.id.btn_produce: //生成二維碼
              /*  (String content,  需要生成二維碼的字串
                    Context context, 上下文
                    Bitmap logo,  二維碼中間的logo
                int hightAndWidth   圖片的高度
                */
                String testString = "白馬秋風塞上，杏花春雨江南。";
                Bitmap bitmap = EncodingHandler.enCodeStringWithLogo(testString, MainActivity.this, null, 200);
                imgIcon.setImageBitmap(bitmap);
                break;
            case R.id.btn_produce_logo: //生成帶logo的二維碼
                String test2 = "白馬秋風塞上，杏花春雨江南。";
                Bitmap dogBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.dog);
                Bitmap bitmap2 = EncodingHandler.enCodeStringWithLogo(test2, MainActivity.this, dogBitmap, 200);
                imgIcon.setImageBitmap(bitmap2);
                break;
            default:
                break;
        }
    }

    //處理掃描成功的結果，startActivityForResult()

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 1609 && resultCode == RESULT_OK && data != null){ //驗證資料
            String result = data.getStringExtra("result");
            if(!TextUtils.isEmpty(result)){
                Toast.makeText(this, result, Toast.LENGTH_SHORT).show();
                Log.i("AAA", "onActivityResult: --" + result);
            }
        }

    }
}