ScanActivity.java

package com.wisedu.scc.love.activity;

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.os.Bundle;
import android.os.Handler;
import android.os.Vibrator;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.wisedu.scc.love.R;
import com.wisedu.scc.love.widget.qrcode.camera.CameraManager;
import com.wisedu.scc.love.widget.qrcode.decoding.CaptureActivityHandler;
import com.wisedu.scc.love.widget.qrcode.decoding.InactivityTimer;
import com.wisedu.scc.love.widget.qrcode.view.ViewFinderView;

import org.androidannotations.annotations.AfterViews;
import org.androidannotations.annotations.EActivity;
import org.androidannotations.annotations.ViewById;

import java.io.IOException;
import java.util.Vector;

/**
 * Created by JZ on 2015/3/17.
 */
@EActivity(R.layout.activity_scan)
public class ScanActivity extends Activity {

    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;

    @ViewById(R.id.viewfinder_view)
    protected ViewFinderView viewfinderView;

    @ViewById(R.id.button_back)
    protected Button mButtonBack;

    @AfterViews
    public void doAfterViews() {
        CameraManager.init(getApplication());
        mButtonBack.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ScanActivity.this.finish();
            }
        });
        hasSurface = false;
        inactivityTimer = new InactivityTimer(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        if (hasSurface) {
            initCamera(surfaceHolder);
        } else {
            surfaceHolder.addCallback(new CustomSurfaceCallBack());
            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();
    }

    /**
     * 解码
     * @param result
     * @param barcode
     */
    public void handleDecode(Result result, Bitmap barcode) {
        inactivityTimer.onActivity();
        playBeepSoundAndVibrate();
        String resultString = result.getText();
        if (resultString.equals("")) {
            Toast.makeText(ScanActivity.this, "Scan failed!", Toast.LENGTH_SHORT).show();
        }else {
            Intent intent = new Intent(ScanActivity.this, ScanResultActivity_.class);
            Bundle bundle = new Bundle();
            bundle.putString("result", resultString);
            bundle.putParcelable("bitmap", barcode);
            intent.putExtras(bundle);
            startActivity(intent);
        }
        ScanActivity.this.finish();
    }

    /**
     * 初始化相机
     * @param surfaceHolder
     */
    private void initCamera(SurfaceHolder surfaceHolder) {
        try {
            CameraManager.get().openDriver(surfaceHolder);
        } catch (IOException ioe) {
            return;
        } catch (RuntimeException e) {
            return;
        }
        if (handler == null) {
            handler = new CaptureActivityHandler(ScanActivity.this, decodeFormats,
                    characterSet);
        }
    }

    /**
     * 自定义回调
     */
    private class CustomSurfaceCallBack implements SurfaceHolder.Callback{
        @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();
    }

    /**
     * 初始化扫描成功的声音
     */
    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;

    /**
     * 发出响声
     */
    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);
        }
    };

}