Android二维码扫描

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;@Overrideprotected 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() {@Overridepublic 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