Android实战简易教程-第三十五枪（将二维码扫描和生成Demo引入项目实例）

网上有很多关于二维码扫码和二维码生成的Demo，你可能不想透彻的了解它是如何实现的，但是你必须要知道如何引入到你的项目之中，我们研究一下如何将这些Demo引入到自己的项目之中。
我也写了一个Demo，看一下它的目录结构。


这些打红色箭头的部分都是必须要复制到你的项目之中的。引入到你的项目之后会有一些报错，你可以根据错误提示进行修改。
strings里面有一个字段要加入到你的项目之中

colors.xml中有一些你也要复制过去，还好他们都会报错提醒你。
下面我们看一下Demo的代码：
1.MainActivity.java:

package com.example.scancodedemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

    public static final int CODE=1;
    private Button mScanCode;
    private Button mCreateCode;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mCreateCode=(Button)findViewById(R.id.btn_create_code);
        mScanCode=(Button)findViewById(R.id.btn_scan_code);
        mCreateCode.setOnClickListener(this);
        mScanCode.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btn_create_code:
            Intent intent1=new Intent(MainActivity.this,CodeShowActivity.class);
            startActivity(intent1);

            break;
         case R.id.btn_scan_code:
             Intent intent=new Intent(MainActivity.this,MipcaActivityCapture.class);
             intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
             startActivityForResult(intent, CODE);

            break;

        default:
            break;
        }

    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
        case CODE:
            if(resultCode == Activity.RESULT_OK){
                Bundle bundle = data.getExtras();
                Toast.makeText(MainActivity.this, bundle.getString("result"), Toast.LENGTH_SHORT).show();
                //result中保留了二维码的内容
            }

            break;

        default:
            break;
        }
    }

}

2.MipcaActivity.java(二维码处理类)：

package com.example.scancodedemo;

import java.io.IOException;
import java.util.Vector;

import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.graphics.Bitmap;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Vibrator;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.mining.app.zxing.camera.CameraManager;
import com.mining.app.zxing.decoding.CaptureActivityHandler;
import com.mining.app.zxing.decoding.InactivityTimer;
import com.mining.app.zxing.view.ViewfinderView;
/**
 * Initial the camera
 * @author Ryan.Tang
 */
public class MipcaActivityCapture extends Activity implements Callback {

    private CaptureActivityHandler handler;
    private ViewfinderView viewfinderView;
    private boolean hasSurface;
    private Vector<BarcodeFormat> decodeFormats;
    private String characterSet;
    private InactivityTimer inactivityTimer;
    private MediaPlayer mediaPlayer;
    private boolean playBeep;
    private static final float BEEP_VOLUME = 0.10f;
    private boolean vibrate;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.scan_code_activity);
        //ViewUtil.addTopView(getApplicationContext(), this, R.string.scan_card);
        CameraManager.init(getApplication());
        viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);

        Button mButtonBack = (Button) findViewById(R.id.button_back);
        mButtonBack.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                MipcaActivityCapture.this.finish();

            }
        });
        hasSurface = false;
        inactivityTimer = new InactivityTimer(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        if (hasSurface) {
            initCamera(surfaceHolder);
        } else {
            surfaceHolder.addCallback(this);
            surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }
        decodeFormats = null;
        characterSet = null;

        playBeep = true;
        AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
        if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
            playBeep = false;
        }
        initBeepSound();
        vibrate = true;

    }

    @Override
    protected void onPause() {
        super.onPause();
        if (handler != null) {
            handler.quitSynchronously();
            handler = null;
        }
        CameraManager.get().closeDriver();
    }

    @Override
    protected void onDestroy() {
        inactivityTimer.shutdown();
        super.onDestroy();
    }

    /**
     * ?????????
     * @param result
     * @param barcode
     */
    public void handleDecode(Result result, Bitmap barcode) {
        inactivityTimer.onActivity();
        playBeepSoundAndVibrate();
        String resultString = result.getText();
        if (resultString.equals("")) {
            Toast.makeText(MipcaActivityCapture.this, "Scan failed!", Toast.LENGTH_SHORT).show();
        }else {
            Intent resultIntent = new Intent();
            Bundle bundle = new Bundle();
            bundle.putString("result", resultString);
            bundle.putParcelable("bitmap", barcode);
            resultIntent.putExtras(bundle);
            this.setResult(RESULT_OK, resultIntent);
        }
        MipcaActivityCapture.this.finish();
    }

    private void initCamera(SurfaceHolder surfaceHolder) {
        try {
            CameraManager.get().openDriver(surfaceHolder);
        } catch (IOException ioe) {
            return;
        } catch (RuntimeException e) {
            return;
        }
        if (handler == null) {
            handler = new CaptureActivityHandler(this, decodeFormats,
                    characterSet);
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {

    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        if (!hasSurface) {
            hasSurface = true;
            initCamera(holder);
        }

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        hasSurface = false;

    }

    public ViewfinderView getViewfinderView() {
        return viewfinderView;
    }

    public Handler getHandler() {
        return handler;
    }

    public void drawViewfinder() {
        viewfinderView.drawViewfinder();

    }

    private void initBeepSound() {
        if (playBeep && mediaPlayer == null) {
            // The volume on STREAM_SYSTEM is not adjustable, and users found it
            // too loud,
            // so we now play on the music stream.
            setVolumeControlStream(AudioManager.STREAM_MUSIC);
            mediaPlayer = new MediaPlayer();
            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mediaPlayer.setOnCompletionListener(beepListener);

            AssetFileDescriptor file = getResources().openRawResourceFd(
                    R.raw.beep);
            try {
                mediaPlayer.setDataSource(file.getFileDescriptor(),
                        file.getStartOffset(), file.getLength());
                file.close();
                mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
                mediaPlayer.prepare();
            } catch (IOException e) {
                mediaPlayer = null;
            }
        }
    }

    private static final long VIBRATE_DURATION = 200L;

    private void playBeepSoundAndVibrate() {
        if (playBeep && mediaPlayer != null) {
            mediaPlayer.start();
        }
        if (vibrate) {
            Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
            vibrator.vibrate(VIBRATE_DURATION);
        }
    }

    /**
     * When the beep has finished playing, rewind to queue up another one.
     */
    private final OnCompletionListener beepListener = new OnCompletionListener() {
        public void onCompletion(MediaPlayer mediaPlayer) {
            mediaPlayer.seekTo(0);
        }
    };

}

3.CreateQRImage.java(字符串生成二维码工具类)：

package com.example.scancodedemo;

import java.util.Hashtable;

import android.graphics.Bitmap;
import android.widget.ImageView;

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;

public class CreateQRImage
{
    private Bitmap bitmap;
    private int QR_WIDTH = 200, QR_HEIGHT = 200;


    public Bitmap  createQRImage(String url)
    {
        try
        {
            if (!(url == null || "".equals(url) || url.length() < 1))
            {

            Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            BitMatrix bitMatrix = new QRCodeWriter().encode(url, 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;
                    }
                }
            }
            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 bitmap;
    }

}

4.CodeShowActivity.java(二维码显示页)：

package com.example.scancodedemo;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.Window;
import android.widget.ImageView;

public class CodeShowActivity extends Activity {
    private ImageView mImgCodeShow;
    CreateQRImage createQRImageTest;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.code_show_activity);
        mImgCodeShow=(ImageView)findViewById(R.id.img_code_show);
        createQRImageTest=new CreateQRImage();
        Bitmap bitmap=createQRImageTest.createQRImage("http://www.baidu.com");
        mImgCodeShow.setImageBitmap(bitmap);

    }

}

布局文件
1.scan_code_activity.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <SurfaceView
            android:id="@+id/preview_view"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_gravity="center" />

        <com.mining.app.zxing.view.ViewfinderView
            android:id="@+id/viewfinder_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <include
            android:id="@+id/include1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            layout="@layout/activity_title" />
    </RelativeLayout>

</FrameLayout>

2.activity_main.xml很简单就不写了
3.code_show_activity.xml里面就一个ImageView,用于展示生成的二维码。

下面我们运行一下我们的demo:

扫描出的信息以Toast的形式打印出（baidu）

看的出，我们的demo可以正常运行。
我们关注的不是代码能不能懂，是能不能用，哈。按照我上面的截图复制到你的项目中，应该不会有太大的问题，这些步骤都是我亲自试过的。有问题可以联系我。

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