Android(安卓)zxing 二维码扫描和生成方法（简单版）

前言

二维码大家都见识过，这里就不废话了，直接来干货。

步骤

导入依赖

    compile 'com.google.zxing:core:3.2.1'      //zxing核心依赖    compile 'com.journeyapps:zxing-android-embedded:3.3.0'  //生成二维码依赖

生成二维码
这里封装一个ZxingUtils,主要功能就是生成二维码的Bitmap对象,调用工具类的方式就不多说了，就是一个点击事件生成就好

package com.example.zxingtest.utils;import android.graphics.Bitmap;import com.google.zxing.BarcodeFormat;import com.google.zxing.MultiFormatWriter;import com.google.zxing.WriterException;import com.google.zxing.common.BitMatrix;import com.journeyapps.barcodescanner.BarcodeEncoder;/** * Created by D'Russel on 2017/7/31. */public class ZxingUtils {   public static Bitmap createBitmap(String str){        Bitmap bitmap = null;        BitMatrix result = null;        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();        try {            result = multiFormatWriter.encode(str, BarcodeFormat.QR_CODE, 400, 400);            BarcodeEncoder barcodeEncoder = new BarcodeEncoder();            bitmap = barcodeEncoder.createBitmap(result);        } catch (WriterException e){            e.printStackTrace();        } catch (IllegalArgumentException iae){ // ?            return null;        }        return bitmap;    }}

实现扫描二维码功能

在布局文件activity_main.xml中添加一个按钮

<?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:orientation="vertical"    tools:context="com.example.zxingtest.activity.MainActivity">    <TextView        android:id="@+id/tv_test"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <ImageView        android:id="@+id/pic_test"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <Button        android:id="@+id/btn_test"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="生成二维码"/>    <Button        android:id="@+id/btn_test2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="扫描二维码"/>LinearLayout>

在MainActivity中

package com.example.zxingtest.activity;import android.content.Intent;import android.graphics.Bitmap;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;import com.example.zxingtest.R;import com.example.zxingtest.utils.ZxingUtils;import com.google.zxing.integration.android.IntentIntegrator;import com.google.zxing.integration.android.IntentResult;import butterknife.BindView;import butterknife.ButterKnife;import butterknife.OnClick;/** * Created by D'Russel on 2017/7/31. */public class MainActivity extends AppCompatActivity{    @BindView(R.id.tv_test)    TextView tv_test;    @BindView(R.id.pic_test)    ImageView img_test;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);    }     //生成二维码    @OnClick(R.id.btn_test)    public void onTest(View view){        Bitmap bitmap = ZxingUtils.createBitmap("hahahaha");        img_test.setImageBitmap(bitmap);    }    //扫描二维码    @OnClick(R.id.btn_test2)    public void onTest2(View view){        new IntentIntegrator(this)                .setOrientationLocked(false)                .setCaptureActivity(ScanActivity.class) // 设置自定义的activity是ScanActivity                .initiateScan(); // 初始化扫描    }    @Override// 通过 onActivityResult的方法获取扫描回来的值    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        IntentResult intentResult = IntentIntegrator.parseActivityResult(requestCode,resultCode,data);        if(intentResult != null) {            if(intentResult.getContents() == null) {                Toast.makeText(this,"内容为空",Toast.LENGTH_LONG).show();            } else {                Toast.makeText(this,"扫描成功",Toast.LENGTH_LONG).show();                // ScanResult 为 获取到的字符串                String ScanResult = intentResult.getContents();                tv_test.setText(ScanResult);            }        } else {            super.onActivityResult(requestCode,resultCode,data);        }    }}

这里有一个作为扫描框的ScanActivity,先看布局文件activity_scan.xml，这里放置一个扫描框，二维码的扫描功能就是这个扫描框提供的

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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"    xmlns:app="http://schemas.android.com/apk/res-auto"    tools:context="com.example.zxingtest.activity.ScanActivity">    <com.journeyapps.barcodescanner.DecoratedBarcodeView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/dbv"        app:zxing_framing_rect_width="200dp"        app:zxing_framing_rect_height="200dp"        app:zxing_preview_scaling_strategy="fitXY"        app:zxing_use_texture_view="true"       >    com.journeyapps.barcodescanner.DecoratedBarcodeView>RelativeLayout>

ScanActivity中

package com.example.zxingtest.activity;import android.content.pm.PackageManager;import android.os.Bundle;import android.os.PersistableBundle;import android.support.v7.app.AppCompatActivity;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.Toast;import com.example.zxingtest.R;import com.journeyapps.barcodescanner.CaptureManager;import com.journeyapps.barcodescanner.DecoratedBarcodeView;import butterknife.BindView;import butterknife.ButterKnife;/** * Created by D'Russel on 2017/7/31. */public class ScanActivity extends AppCompatActivity{    @BindView(R.id.dbv) DecoratedBarcodeView mDBV;    private CaptureManager captureManager;     //捕获管理器    @Override    protected void onPause() {        super.onPause();        captureManager.onPause();    }    @Override    protected void onResume() {        super.onResume();        captureManager.onResume();    }    @Override    protected void onDestroy() {        super.onDestroy();        captureManager.onDestroy();    }    @Override    public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {        super.onSaveInstanceState(outState, outPersistentState);        captureManager.onSaveInstanceState(outState);    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        return mDBV.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event);    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_scan);        ButterKnife.bind(this);        captureManager = new CaptureManager(this,mDBV);        captureManager.initializeFromIntent(getIntent(),savedInstanceState);        captureManager.decode();    }}

这里解释一下 CaptureManager
CaptureManager中文名是捕获管理器，从名字上可以看出，这是扫描框中对捕获内容处理的管理器，那上面的代码就很好理解了，我们让它的生命周期同Activity的生命周期一样。

生成二维码：

扫描二维码：

前言

步骤

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