扫描二维码 生成二维码

mainactivity.xml布局

<?xml version="1.0" encoding="utf-8"?>

<Button
    android:id="@+id/btnSan"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="扫描二维码" />

<TextView
    android:id="@+id/tv_content"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/btnSan"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="10dp" />

<EditText
    android:id="@+id/et_input"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/tv_content"
    android:layout_marginTop="10dp"
    android:hint="请输入要生成的二维码文字" />

<Button
    android:id="@+id/btn_generate"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/et_input"
    android:layout_marginTop="10dp"
    android:text="生成二维码" />

<ImageView
    android:id="@+id/img"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/btn_generate"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="10dp" />

MainActivity页面

package bw.com.shengcheng;

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

import com.xys.libzxing.zxing.activity.CaptureActivity;
import com.xys.libzxing.zxing.encoding.EncodingUtils;

public class MainActivity extends AppCompatActivity {
private TextView tv_content;
private EditText et_input;
private ImageView img;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv_content=findViewById(R.id.tv_content);
et_input=findViewById(R.id.et_input);
img=findViewById(R.id.img);

    findViewById(R.id.btnSan).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
  startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class),0);
        }
    });

    findViewById(R.id.btn_generate).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String str=et_input.getText().toString();
            if (str.equals("")){
                Toast.makeText(MainActivity.this,"不能为空",Toast.LENGTH_SHORT).show();;

            }else{
                //位图
                Bitmap bitmap= EncodingUtils.createQRCode(str,500,500,null);
                //设置图片
                img.setImageBitmap(bitmap);

            }
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode==RESULT_OK){
        String result=data.getExtras().getString("result");
        Log.d("Main",result);
        tv_content.setText(result);
    }
}

}

导libzxing

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