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 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：
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