Android 扫描二维码

首先布局

xml

   <Button android:id="@+id/btn"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="打开二维码扫描界面"/>

MainActivity

package com.bwie.a20181106_a;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.uuzuche.lib_zxing.activity.CaptureActivity;
import com.uuzuche.lib_zxing.activity.CodeUtils;

public class MainActivity extends AppCompatActivity {

private Button mBtn;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mBtn = findViewById(R.id.btn);
    mBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(MainActivity.this,CaptureActivity.class);
            startActivityForResult(intent,1);
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    /**
     * 处理二维码的扫描结果
     */
    if (requestCode == 1){
        //处理扫描结果(在界面上显示)
        if (data != null){
            Bundle bundle = data.getExtras();
            if (bundle == null){
                return;
            }
            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_LONG).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();
            }
        }
    }
}

}
创建一个类

MyApplication

public void onCreate() {
    super.onCreate();
    ZXingLibrary.initDisplayOpinion(this);
}

在build里边写入下边

 configurations.all {
        resolutionStrategy.eachDependency { DependencyResolveDetails details ->
            def requested = details.requested
            if (requested.group == 'com.android.support') {
                if (!requested.name.startsWith("multidex")) {
                    details.useVersion '27.1.1' //这里改为你项目使用的版本即可
                }
            }
        }
    }

导入依赖

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

写入权限

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.FLASHLIGHT" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    //千万要记得Application 写入这句话  否则 嘿嘿O(∩_∩)   让你找半天Bug
    android:name=".MyApplication"