Android二维码的生成，解析以及扫描功能

<1>

布局只有2个按钮，实现生成二维码和解析二维码

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="create"
        android:text="生成二維碼"
        android:id="@+id/button" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="parse"
        android:text="解析二维码"
        android:id="@+id/button2" />

2.

package myapplication.com.myapplication;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;

import com.google.zxing.RGBLuminanceSource;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import com.google.zxing.qrcode.QRCodeWriter;

import org.json.JSONObject;

import java.io.FileOutputStream;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void  create(View v){
        //构建二维码内容的结构的对象
        QRCodeWriter writer=new QRCodeWriter();
        //构造内存空间
        String url="http://www.baidu.com";

        int width=;
        int height=;
        try {
            JSONObject value=new JSONObject();
            value.put("url","http://www.baidu.com");
            value.put("tel","");
            value.put("account","");
            url=value.toString();
            BitMatrix matrix = writer.encode(url, BarcodeFormat.QR_CODE, width, height);
            //数组
            int ms[]=new int[width*height];
            //给数组元素赋值
            for(int y=;y<height;y++){
                for(int x=;x<width;x++){
                    if (matrix.get(x,y)){
                        ms[y*width+x]=0xff000000;
                    }else{
                        ms[y*width+x]=0xffffffff;
                    }
                }
            }
            //缓冲区
            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(ms,,width,,,width,height);
            FileOutputStream out=new FileOutputStream("/sdcard/abcd.png");
            //压缩并保存
            bitmap.compress(Bitmap.CompressFormat.PNG,,out);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //解析二维码
    public void  parse(View v){
        Bitmap map= BitmapFactory.decodeFile("/sdcard/abcd.png");
        int width = map.getWidth();
        int height = map.getHeight();
        int ps[]=new int[width*height];
        map.getPixels(ps,,width,,,width,height);
        LuminanceSource src=new RGBLuminanceSource(width,height,ps);
        Binarizer rizer=new HybridBinarizer(src);
        BinaryBitmap bbmap=new BinaryBitmap(rizer);
        QRCodeReader read=new QRCodeReader();
        try {
            Result result = read.decode(bbmap);
            //根据获取到的文本内容进行下一步处理,这里是打开网址
            String value=result.getText();
            JSONObject msg=new JSONObject(value);
            System.out.println("--"+msg.getString("account"));
            Intent it=new Intent(Intent.ACTION_VIEW);
            it.setData(Uri.parse(msg.getString("url")));
            startActivity(it);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

3. 加入的jar包和权限

jar包地址：链接：http://pan.baidu.com/s/1crGxL8 密码：f1kp

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

<2> 实现扫描二维码功能

1.加入权限

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

2.ScannerActivity

package myapplication.com.myerweima;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.google.zxing.Result;

import me.dm7.barcodescanner.zxing.ZXingScannerView;

public class ScannerActivity extends AppCompatActivity implements ZXingScannerView.ResultHandler {
    private ZXingScannerView mZXingScannerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mZXingScannerView = new ZXingScannerView(this); // 将ZXingScannerView作为布局
        setContentView(mZXingScannerView);
    }

    @Override
    protected void onResume() {
        super.onResume();
        mZXingScannerView.setResultHandler(this); // 设置处理结果回调
        mZXingScannerView.startCamera(); // 打开摄像头
    }

    @Override
    protected void onPause() {
        super.onPause();
        mZXingScannerView.stopCamera(); // 活动失去焦点的时候关闭摄像头
    }

    @Override
    public void handleResult(Result result) { // 实现回调接口，将数据回传并结束活动
        Intent data = new Intent();
        data.putExtra("text", result.getText());
        setResult(RESULT_OK, data);
        finish();
    }
}

3. 主布局，一个button一个textview点击btn扫描，扫描后显示在textView上

 <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="扫描"
        android:id="@+id/bt"
        android:textColor="#000000"
        />
    <TextView
        android:id="@+id/text"
        android:layout_marginTop="30dp"
        android:layout_below="@+id/bt"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:textColor="#000000"
        android:text="11"/>

4.

package myapplication.com.myerweima;

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.TextView;

public class MainActivity extends AppCompatActivity {
    TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button bt= (Button) findViewById(R.id.bt);
         textView= (TextView) findViewById(R.id.text);
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                scanCode();
            }
        });
    }

    public void scanCode(){
        startActivityForResult(new Intent(this, ScannerActivity.class), 1);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK){
            textView.setText(data.getStringExtra("text")); // 显示识别到的文字

        }
    }
}

5.gradle

  compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.google.zxing:zxing-parent:3.3.0'
    compile 'me.dm7.barcodescanner:zxing:1.9'