二维码的生成与扫描

package com.example.ggq.gaoguoqing20180811;

import android.content.Intent;
import android.graphics.Bitmap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import com.uuzuche.lib_zxing.activity.CaptureActivity;
import com.uuzuche.lib_zxing.activity.CodeUtils;

public class SaoActivity extends AppCompatActivity {

    private static final int QR_CODE = 99;
    private EditText edit_text;
    private ImageView iv_scan;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sao);
        edit_text = findViewById(R.id.edit_text);
        iv_scan = findViewById(R.id.iv_scan);
    }
    //扫描
    public void scanQRCode(View view) {
        Intent intent = new Intent(this, CaptureActivity.class);
        startActivityForResult(intent, QR_CODE);
    }
    //生成
    public void generateQRCode(View view) {
        String content = edit_text.getText().toString();
        if (TextUtils.isEmpty(content)) {
            Toast.makeText(this, "请输入关键字", Toast.LENGTH_SHORT).show();
            return;
        }
        Bitmap image = CodeUtils.createImage(content, 500, 500, null);
        iv_scan.setImageBitmap(image);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == QR_CODE && resultCode == RESULT_OK) {
            Bundle bundle = data.getExtras();
            if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_SUCCESS) {
                String result = bundle.getString(CodeUtils.RESULT_STRING);
                Toast.makeText(this, "解析结果:" + result, Toast.LENGTH_SHORT).show();
            } else if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_FAILED) {
                Toast.makeText(this, "解析二维码失败", Toast.LENGTH_LONG).show();
            }
        }
    }
}

package com.example.ggq.gaoguoqing20180811.app;

import android.app.Application;
import com.uuzuche.lib_zxing.activity.ZXingLibrary;

public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        ZXingLibrary.initDisplayOpinion(this);
    }
}

//权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA"/>

<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

implementation 'cn.yipianfengye.android:zxing-library:2.2'