zxing快速使用之生成二维码和扫描二维码

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "24.0.0"

    defaultConfig {
        applicationId "com.itant.zxingtest"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.4.0'

    /*自定义*/
    /*compile 'com.google.zxing:core:3.2.1'*/

    /*快速集成*/
    compile 'me.dm7.barcodescanner:zxing:1.9'
}

权限配置：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.itant.zxingtest">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity android:name=".ScanActivity"/>
    </application>

</manifest>

MainActivity.java

package com.itant.zxingtest;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import com.google.zxing.WriterException;

public class MainActivity extends AppCompatActivity {
    private String directoryString;
    private Bitmap bitmap;

    private static String[] REQUIRED_PERMISSIONS = {
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.CAMERA
    };

    /**
     * 初始化权限
     */
    private void initPermission() {
        int permission = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (permission != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(
                    this,
                    REQUIRED_PERMISSIONS,
                    1
            );
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 1) {
            int grantResult = grantResults[0];
            boolean granted = grantResult == PackageManager.PERMISSION_GRANTED;

            if (!granted) {
                Toast.makeText(this, "您拒绝了程序运行所需的最基本权限", Toast.LENGTH_SHORT).show();
                System.exit(0);
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        directoryString = Environment.getExternalStorageDirectory().getPath() + "/erweima/";

        initPermission();
        ImageView imageView = (ImageView) findViewById(R.id.imageView);

        try {
            bitmap = BitmapTool.getQrCodeImage(UITool.dipToPx(this, 125), UITool.dipToPx(this, 125), "www.baidu.com");
            imageView.setImageBitmap(bitmap);
        } catch (WriterException e) {
            e.printStackTrace();
        }

        imageView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                if (bitmap != null) {
                    FileTool.saveBitmap(bitmap, directoryString, "erweima");
                    Toast.makeText(MainActivity.this, "二维码保存成功", Toast.LENGTH_SHORT).show();
                }
                return false;
            }
        });


        Button btn_scan  = (Button) findViewById(R.id.btn_scan);
        btn_scan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, ScanActivity.class);
                MainActivity.this.startActivity(intent);
            }
        });
    }
}

BitmapTool.java

package com.itant.zxingtest;

import android.graphics.Bitmap;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;

/**
 * Created by 詹子聪 on 2016/11/29.
 */
public class BitmapTool {

    // 生成QR图
    public static Bitmap getQrCodeImage(int QR_WIDTH, int QR_HEIGHT, String text) throws WriterException {
        try {
            // 需要引入core包
            QRCodeWriter writer = new QRCodeWriter();

            if (text == null || "".equals(text) || text.length() < 1) {
                return null;
            }

            Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.MARGIN, 0);

            BitMatrix bitMatrix = new QRCodeWriter().encode(text, BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
            int[] pixels = new int[QR_WIDTH * QR_HEIGHT];


            for (int y = 0; y < QR_HEIGHT; y++) {
                for (int x = 0; x < QR_WIDTH; x++) {
                    if (bitMatrix.get(x, y)) {
                        pixels[y * QR_WIDTH + x] = 0xff000000;
                    } else {
                        pixels[y * QR_WIDTH + x] = 0xffffffff;// 解决保存之后一片黑的bug
                    }
                }
            }

            Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
                    Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);

            return bitmap;

        } catch (WriterException e) {
            e.printStackTrace();
            return null;
        }
    }
}

FileTool.java

package com.itant.zxingtest;

import android.graphics.Bitmap;
import android.os.Environment;

import java.io.File;
import java.io.FileOutputStream;

/**
 * Created by 詹子聪 on 2016/11/29.
 */
public class FileTool {

    /**
     * 保存bitmap为文件
     *
     * @param bitmap
     * @param directoryString 目录名称
     * @param fileName 文件名(不包括后缀名)
     * @return
     */
    public static File saveBitmap(Bitmap bitmap, String directoryString, String fileName) {
        File directory = new File(directoryString);
        if (!directory.exists()) {
            boolean createSuc = false;
            createSuc = directory.mkdirs();
            if (!createSuc) {
                return null;
            }
        }

        File file = new File(directoryString + fileName + ".png");
        if (file.exists()) {
            boolean delSuc = file.delete();
            if (!delSuc) {
                return null;
            }
        }

        try {

            file.createNewFile();
            FileOutputStream out = new FileOutputStream(file);
            bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
            out.flush();
            out.close();
        } catch (Exception e) { // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return file;
    }
}

UITool.java

package com.itant.zxingtest;

import android.content.Context;

/**
 * Created by 詹子聪 on 2016/11/29.
 */
public class UITool {
    /**
     * @Description 根据手机的分辨率从 dip 的单位 转成为 px(像素)
     * @param context
     *            环境
     * @param dipValue
     *            需要转化的dip值
     * @return int 转化后的px值
     */
    public static int dipToPx(Context context, float dipValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dipValue * scale + 0.5f);
    }
}

ScanActivity.java

package com.itant.zxingtest;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.util.Log;

import com.google.zxing.Result;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

/**
 * Created by 詹子聪 on 2016/11/30.
 */
public class ScanActivity extends Activity implements ZXingScannerView.ResultHandler{
    private ZXingScannerView mScannerView;

    @Override
    public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
        //setContentView(R.layout.activity_scan);
    }

    @Override
    protected void onResume() {
        super.onResume();
        mScannerView = new ZXingScannerView(ScanActivity.this);   // Programmatically initialize the scanner view
        setContentView(mScannerView);
        mScannerView.setResultHandler(ScanActivity.this); // Register ourselves as a handler for scan results.
        mScannerView.startCamera();         // Start camera
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mScannerView != null && mScannerView.isActivated()) {
            mScannerView.stopCamera();
        }
    }

    @Override
    public void handleResult(Result rawResult) {
        // Do something with the result here
        Log.e("handler", rawResult.getText()); // Prints scan results
        Log.e("handler", rawResult.getBarcodeFormat().toString()); // Prints the scan format (qrcode)

        // show the scanner result into dialog box.
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Scan Result");
        builder.setMessage(rawResult.getText());
        AlertDialog alert1 = builder.create();
        alert1.show();

        // If you would like to resume scanning, call this method below:
        // mScannerView.resumeCameraPreview(this);
    }
}