Android二维码扫描

来源：互联网发布：丁香园cto 知乎编辑：程序博客网时间：2024/06/06 09:52

本文详细说明怎么在Android端实现二维码扫描，只是讲述如何利用Google zxing进行二维码扫描，不涉及代码的深入研究，结果文章最后附有demo，demo可直接使用，觉得文章累赘可以直接拷demo中的包和类应用到自己的项目中使用

1.先将zxing.jar拷到libs文件夹并添加依赖到项目

2.将下面几个包跟类拷贝到项目中

3.扫描页逻辑跟界面

public class Sao1SaoActivity extends Activity implements Callback{    private SurfaceView surfaceView;    private ViewfinderView viewfinderView;    private CaptureActivityHandler handler;    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;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_sao1sao);        surfaceView = (SurfaceView) findViewById(R.id.preview_view);        viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);        //ViewUtil.addTopView(getApplicationContext(), this, R.string.scan_card);        CameraManager.init(getApplication());        hasSurface = false;        inactivityTimer = new InactivityTimer(this);    }    @Override    protected void onResume() {        super.onResume();        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();    }    /**     * 处理扫描结果     *     * @param result     * @param barcode     */    public void handleDecode(Result result, Bitmap barcode) {        inactivityTimer.onActivity();        playBeepSoundAndVibrate();        String resultString = result.getText();        if (resultString.equals("")) {            Toast.makeText(Sao1SaoActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();            Sao1SaoActivity.this.finish();        } else {            Intent resultIntent = new Intent();            resultIntent.setClass(Sao1SaoActivity.this, Sao1SaoResultActivity.class);            resultIntent.putExtra("result", resultString);            ByteArrayOutputStream baos = new ByteArrayOutputStream();            barcode.compress(Bitmap.CompressFormat.PNG, 100, baos);            byte[] bitmapByte = baos.toByteArray();            resultIntent.putExtra("bitmap", bitmapByte);            startActivity(resultIntent);            overridePendingTransition(R.anim.activity_in_from_rigth, R.anim.activity_out_to_scale);            Sao1SaoActivity.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();    }    /**     * 初始化声音资源     */    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);//设置音量                mediaPlayer.prepare();            } catch (IOException e) {                mediaPlayer = null;            }        }    }    private static final long VIBRATE_DURATION = 200L;    /**     * 响铃和震动     */    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 MediaPlayer.OnCompletionListener beepListener = new MediaPlayer.OnCompletionListener() {        public void onCompletion(MediaPlayer mediaPlayer) {            mediaPlayer.seekTo(0);        }    };}

其中：

 /**     * 处理扫描结果     *     * @param result     * @param barcode     */    public void handleDecode(Result result, Bitmap barcode) {        inactivityTimer.onActivity();        playBeepSoundAndVibrate();        String resultString = result.getText();        if (resultString.equals("")) {            Toast.makeText(Sao1SaoActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();            Sao1SaoActivity.this.finish();        } else {            Intent resultIntent = new Intent();            resultIntent.setClass(Sao1SaoActivity.this, Sao1SaoResultActivity.class);            resultIntent.putExtra("result", resultString);            ByteArrayOutputStream baos = new ByteArrayOutputStream();            barcode.compress(Bitmap.CompressFormat.PNG, 100, baos);            byte[] bitmapByte = baos.toByteArray();            resultIntent.putExtra("bitmap", bitmapByte);            startActivity(resultIntent);            overridePendingTransition(R.anim.activity_in_from_rigth, R.anim.activity_out_to_scale);            Sao1SaoActivity.this.finish();        }    }

这个方法是处理扫描结果的

 playBeepSoundAndVibrate();//这个方法是为了扫描出结果时震动和响铃

然后下面是执行扫描结果，我这里是把数据携带然后跳转到另一个界面、但是有个注意的是bundle和Intent.putExtra是不能传递大于40kb的图片的，所以解决办法是吧bitmap转换成byte数组然后再把byte数据传递过去。

扫描界面布局为：

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <RelativeLayout        android:layout_width="match_parent"        android:layout_height="match_parent" >        <SurfaceView            android:id="@+id/preview_view"            android:layout_width="fill_parent"            android:layout_height="fill_parent"            android:layout_gravity="center" />        <com.sjr.saomiao.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_sao1sao_title" />    </RelativeLayout></FrameLayout>

扫描结果我将它显示成了一个edittext

public class Sao1SaoResultActivity extends Activity {    private EditText etSao1SaoResult;    private Button btnBack;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_sao1sao_result);        etSao1SaoResult = (EditText) findViewById(R.id.et_sao1sao_result);        btnBack = (Button) findViewById(R.id.btn_back);        String result = getIntent().getStringExtra("result");        etSao1SaoResult.setText(result);        btnBack.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Sao1SaoResultActivity.this.finish();            }        });    }

然后这样就完成了一个扫描的demo，下面是说明一些参数比如扫描匡大小和颜色之类的ui
扫描匡的四个角颜色是在ViewfinderView这个类里面，这个类前面已经拷过项目里面了，
还有一些框下面的文字之类的设置也是在这个类，直接进这个类去改参数就可以了。
扫描匡的大小是在CameraManager这个类里面
private static final int MIN_FRAME_WIDTH = 480;
private static final int MIN_FRAME_HEIGHT = 480;
private static final int MAX_FRAME_WIDTH = 720;
private static final int MAX_FRAME_HEIGHT = 600;
这四个参数就是设置匡的大小
上面这些就已经完成一个二维码扫描的业务逻辑了
结果如下我拿来扫描了一下微信：

完整源码下载地址：

http://download.csdn.net/detail/lxzmmd/9506920

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