Android扫描二维码及生成二维码Demo

制作二维码扫描及生成Demo首先要导入Google Zxing包code.jar。

Zxing源码及jar包下载地址：http://code.google.com/p/zxing/

Demo下载地址：http://download.csdn.net/detail/ericfantastic/9070921

二维码扫描及生成二维码Demo效果图：

1、导入相关的Zxing类及关键code.jar包：

2、MainActivity的布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

3、主界面MainActivity.java

package com.eric.activity;import java.util.Hashtable;import com.eric.qrcode.R;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.WriterException;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.QRCodeWriter;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.ImageButton;import android.widget.ImageView;import android.widget.TextView;public class MainActivity extends Activity {private TextView text_id,text_loginpro,text_more;private Button btn_scan,btn_change;private ImageButton btn_reset;private EditText edit_password;private ImageView img;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);img = (ImageView) findViewById(R.id.img_touxiang);text_id = (TextView) findViewById(R.id.text_id);text_loginpro =(TextView) findViewById(R.id.text_loginpro);btn_change = (Button) findViewById(R.id.btn_change);btn_scan = (Button) findViewById(R.id.btn_scan);btn_reset = (ImageButton) findViewById(R.id.btn_reset);edit_password = (EditText) findViewById(R.id.edit_password);btn_scan.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();intent.setClass(MainActivity.this, CaptureActivity.class);startActivity(intent);}}) ;btn_change.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {try {String code = edit_password.getText().toString();Bitmap codeBitmap = EncodingHandler.createQRCode(code,220);img.setImageBitmap(codeBitmap);} catch (WriterException e) {e.printStackTrace();}}});}//生成二维码public final static class EncodingHandler {       private static final int BLACK = 0xff000000;              public static Bitmap createQRCode(String str,int widthAndHeight) throws WriterException {           Hashtable hints = new Hashtable();             hints.put(EncodeHintType.CHARACTER_SET, "utf-8");            BitMatrix matrix = new MultiFormatWriter().encode(str,                   BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);           int width = matrix.getWidth();           int height = matrix.getHeight();           int[] pixels = new int[width * height];                       for (int y = 0; y < height; y++) {               for (int x = 0; x < width; x++) {                   if (matrix.get(x, y)) {                       pixels[y * width + x] = BLACK;                   }               }           }           Bitmap bitmap = Bitmap.createBitmap(width, height,                   Bitmap.Config.ARGB_8888);           bitmap.setPixels(pixels, 0, width, 0, 0, width, height);           return bitmap;       }   }   }

4、CaptureActivity的布局文件capture.xml

<?xml version="1.0" encoding="utf-8"?>

5、扫描二维码CaptureActivity.java

package com.eric.activity;import java.io.IOException;import java.util.Vector;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;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.eric.qrcode.R;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;public class CaptureActivity extends Activity implements Callback {private CaptureActivityHandler handler;private ViewfinderView viewfinderView;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;private Button cancelScanButton;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.capture);//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);*/AlertDialog resutlDialog = new AlertDialog.Builder(CaptureActivity.this).create();            resutlDialog.setTitle("扫描结果");            resutlDialog.setMessage(resultString);            resutlDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener()             {                @Override                public void onClick(DialogInterface dialog, int which)                 {                    dialog.dismiss();                }            });                resutlDialog.show();}//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);}};}

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