content: package com.google.zxing.activity;
  
  import android.app.ProgressDialog;
  import android.content.ContentResolver;
  import android.content.Context;
  import android.content.CursorLoader;
  import android.content.Intent;
  import android.content.res.AssetFileDescriptor;
  import android.database.Cursor;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.media.AudioManager;
  import android.media.MediaPlayer;
  import android.media.MediaPlayer.OnCompletionListener;
  import android.net.Uri;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Message;
  import android.os.Vibrator;
  import android.provider.MediaStore;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.text.TextUtils;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.SurfaceHolder;
  import android.view.SurfaceHolder.Callback;
  import android.view.SurfaceView;
  import android.view.View;
  import android.widget.Button;
  import android.widget.ImageButton;
  import android.widget.ImageView;
  import android.widget.TextView;
  import android.widget.Toast;
  
  import com.dommy.qrcode.R;
  import com.dommy.qrcode.util.BitmapUtil;
  import com.dommy.qrcode.util.Constant;
  import com.dommy.qrcode.util.UriUtil;
  import com.google.zxing.BarcodeFormat;
  import com.google.zxing.BinaryBitmap;
  import com.google.zxing.ChecksumException;
  import com.google.zxing.DecodeHintType;
  import com.google.zxing.FormatException;
  import com.google.zxing.NotFoundException;
  import com.google.zxing.Result;
  import com.google.zxing.camera.CameraManager;
  import com.google.zxing.common.HybridBinarizer;
  import com.google.zxing.decoding.CaptureActivityHandler;
  import com.google.zxing.decoding.InactivityTimer;
  import com.google.zxing.decoding.RGBLuminanceSource;
  import com.google.zxing.qrcode.QRCodeReader;
  import com.google.zxing.view.ViewfinderView;
  
  import java.io.IOException;
  import java.util.Hashtable;
  import java.util.Vector;
  
  
  /**
   * Initial the camera
   *
   * @author Ryan.Tang
   */
  public class CaptureActivity extends AppCompatActivity implements Callback {
  
      private static final int REQUEST_CODE_SCAN_GALLERY = 100;
  
      private CaptureActivityHandler handler;
      private ViewfinderView viewfinderView;
      private ImageButton back;
      private ImageButton btnFlash;
      private Button btnAlbum; // 相册
      private boolean isFlashOn = false;
      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 ProgressDialog mProgress;
      private String photo_path;
      private Bitmap scanBitmap;
      //	private Button cancelScanButton;
      /**
       * Called when the activity is first created.
       */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_scanner);
          //ViewUtil.addTopView(getApplicationContext(), this, R.string.scan_card);
          CameraManager.init(getApplication());
          viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_content);
          back = (ImageButton) findViewById(R.id.btn_back);
          back.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  finish();
              }
          });
  
          btnFlash = (ImageButton) findViewById(R.id.btn_flash);
          btnFlash.setOnClickListener(flashListener);
  
          btnAlbum = (Button) findViewById(R.id.btn_album);
          btnAlbum.setOnClickListener(albumOnClick);
  
  //		cancelScanButton = (Button) this.findViewById(R.id.btn_cancel_scan);
          hasSurface = false;
          inactivityTimer = new InactivityTimer(this);
  
      }
  
      private View.OnClickListener albumOnClick = new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              //打开手机中的相册
              Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT); //"android.intent.action.GET_CONTENT"
              innerIntent.setType("image/*");
              startActivityForResult(innerIntent, REQUEST_CODE_SCAN_GALLERY);
          }
      };
  
  
      @Override
      protected void onActivityResult(final int requestCode, int resultCode, Intent data) {
          if (resultCode==RESULT_OK) {
              switch (requestCode) {
                  case REQUEST_CODE_SCAN_GALLERY:
                      handleAlbumPic(data);
                      break;
              }
          }
          super.onActivityResult(requestCode, resultCode, data);
      }
  
      /**
       * 处理选择的图片
       * @param data
       */
      private void handleAlbumPic(Intent data) {
          //获取选中图片的路径
          final Uri uri = data.getData();
  
          mProgress = new ProgressDialog(CaptureActivity.this);
          mProgress.setMessage("正在扫描...");
          mProgress.setCancelable(false);
          mProgress.show();
  
          runOnUiThread(new Runnable() {
              @Override
              public void run() {
                  Result result = scanningImage(uri);
                  mProgress.dismiss();
                  if (result != null) {
                      Intent resultIntent = new Intent();
                      Bundle bundle = new Bundle();
                      bundle.putString(Constant.INTENT_EXTRA_KEY_QR_SCAN ,result.getText());
  
                      resultIntent.putExtras(bundle);
                      CaptureActivity.this.setResult(RESULT_OK, resultIntent);
                      finish();
                  } else {
                      Toast.makeText(CaptureActivity.this, "识别失败", Toast.LENGTH_SHORT).show();
                  }
              }
          });
      }
  
      /**
       * 扫描二维码图片的方法
       * @param uri
       * @return
       */
      public Result scanningImage(Uri uri) {
          if (uri == null) {
              return null;
          }
          Hashtable<DecodeHintType, String> hints = new Hashtable<>();
          hints.put(DecodeHintType.CHARACTER_SET, "UTF8"); //设置二维码内容的编码
  
          scanBitmap = BitmapUtil.decodeUri(this, uri, 500, 500);
          RGBLuminanceSource source = new RGBLuminanceSource(scanBitmap);
          BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source));
          QRCodeReader reader = new QRCodeReader();
          try {
              return reader.decode(bitmap1, hints);
          } catch (NotFoundException e) {
              e.printStackTrace();
          } catch (ChecksumException e) {
              e.printStackTrace();
          } catch (FormatException e) {
              e.printStackTrace();
          }
          return null;
      }
  
      @Override
      protected void onResume() {
          super.onResume();
          SurfaceView surfaceView = (SurfaceView) findViewById(R.id.scanner_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 view
  //		cancelScanButton.setOnClickListener(new OnClickListener() {
  //
  //			@Override
  //			public void onClick(View v) {
  //				CaptureActivity.this.finish();
  //			}
  //		});
      }
  
      @Override
      protected void onPause() {
          super.onPause();
          if (handler != null) {
              handler.quitSynchronously();
              handler = null;
          }
          CameraManager.get().closeDriver();
      }
  
      @Override
      protected 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();
          //FIXME
          if (TextUtils.isEmpty(resultString)) {
              Toast.makeText(CaptureActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();
          } else {
              Intent resultIntent = new Intent();
              Bundle bundle = new Bundle();
              bundle.putString(Constant.INTENT_EXTRA_KEY_QR_SCAN, resultString);
              System.out.println("sssssssssssssssss scan 0 = " + resultString);
              // 不能使用Intent传递大于40kb的bitmap，可以使用一个单例对象存储这个bitmap
  //            bundle.putParcelable("bitmap", barcode);
  //            Logger.d("saomiao",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);
          }
      }
  
      @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();
  
      }
  
      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);
          }
      };
  
      /**
       *  闪光灯开关按钮
       */
      private View.OnClickListener flashListener = new View.OnClickListener() {
          @Override
          public void onClick(View view) {
              try {
                  boolean isSuccess = CameraManager.get().setFlashLight(!isFlashOn);
                  if(!isSuccess){
                      Toast.makeText(CaptureActivity.this, "暂时无法开启闪光灯", Toast.LENGTH_SHORT).show();
                      return;
                  }
                  if (isFlashOn) {
                      // 关闭闪光灯
                      btnFlash.setImageResource(R.drawable.flash_off);
                      isFlashOn = false;
                  } else {
                      // 开启闪光灯
                      btnFlash.setImageResource(R.drawable.flash_on);
                      isFlashOn = true;
                  }
              }catch (Exception e){
                  e.printStackTrace();
              }
          }
      };
  }