正文

　　上文，我们讲了 二维码生成 解码

　　这次我们就用 android 来扫一下，实现android 扫二维码。

　　　　下载扫一扫

包结构-介绍

　　#com.zxing.xx 　　这是 zxing 库提供的

　　#BarCodeActivity

实战

　　一个按钮，一个显示结果的界面

package sedion.jeffli.activity;import sedion.jeffli.itp.R;import com.zxing.activity.CaptureActivity;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.TextView;
import android.widget.Toast;public class BarCodeActivity extends Activity
{private TextView resultTextView;            //返回显示结果（以后没有用的）private Button   scanBarCodeButton;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.barcode);resultTextView = (TextView) this.findViewById(R.id.tv_scan_result);scanBarCodeButton = (Button) this.findViewById(R.id.btn_scan_barcode);scanBarCodeButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {//打开扫描界面Intent openCameraIntent = new Intent(BarCodeActivity.this,CaptureActivity.class);startActivityForResult(openCameraIntent, 0);}});}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);//判断处理结果，并显示if (resultCode == RESULT_OK) {Bundle bundle = data.getExtras();String scanResult = bundle.getString("result");//Toast.makeText(this, "result", Toast.LENGTH_LONG).show();resultTextView.setText(scanResult);}}
}

　　#new Intent(BarCodeActivity.this,CaptureActivity.class);

　　 　　打开扫描界面 -> CaptureActivity (这个是进行扫描的activity）

　　 #resultCode == RESULT_OK

　　　　判断是否成功，成功显示结果。

你会看到：

下面是扫描的界面：

　　CaptureActivity（zxing库提供，nice）

package com.zxing.activity;import java.io.IOException;
import java.util.Vector;import sedion.jeffli.itp.R;
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.zxing.camera.CameraManager;
import com.zxing.decoding.CaptureActivityHandler;
import com.zxing.decoding.InactivityTimer;
import com.zxing.view.ViewfinderView;
/*** Initial the camera* @author Ryan.Tang*/
public class CaptureActivity 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;private Button cancelScanButton;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.camera);//ViewUtil.addTopView(getApplicationContext(), this, R.string.scan_card);CameraManager.init(getApplication());viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);cancelScanButton = (Button) this.findViewById(R.id.btn_cancel_scan);hasSurface = false;inactivityTimer = new InactivityTimer(this);}@Overrideprotected 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;//quit the scan viewcancelScanButton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {CaptureActivity.this.finish();}});}@Overrideprotected void onPause() {super.onPause();if (handler != null) {handler.quitSynchronously();handler = null;}CameraManager.get().closeDriver();}@Overrideprotected void onDestroy() {inactivityTimer.shutdown();super.onDestroy();}/*** Handler scan result* @param result* @param barcode*/public void handleDecode(Result result, Bitmap barcode) {inactivityTimer.onActivity();playBeepSoundAndVibrate();String resultString = result.getText();//FIXMEif (resultString.equals("")) {Toast.makeText(CaptureActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();}else {
//            System.out.println("Result:"+resultString);Intent resultIntent = new Intent();Bundle bundle = new Bundle();bundle.putString("result", resultString);resultIntent.putExtras(bundle);this.setResult(RESULT_OK, resultIntent);}CaptureActivity.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);}}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic void surfaceCreated(SurfaceHolder holder) {if (!hasSurface) {hasSurface = true;initCamera(holder);}}@Overridepublic 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);}};}

你会看到：

总结

　　android 二维码扫描