Android实战简易课程-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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