import com.xys.libzxing.R; //导入依赖的package包/类
private MediaPlayer buildMediaPlayer(Context activity) {
    MediaPlayer mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mediaPlayer.setOnCompletionListener(this);
    mediaPlayer.setOnErrorListener(this);
    try {
        AssetFileDescriptor file = activity.getResources().openRawResourceFd(R.raw.beep);
        try {
            mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
        } finally {
            file.close();
        }
        mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
        mediaPlayer.prepare();
        return mediaPlayer;
    } catch (IOException ioe) {
        Log.w(TAG, ioe);
        mediaPlayer.release();
        return null;
    }
}
 

import com.xys.libzxing.R; //导入依赖的package包/类
@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);

    Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.activity_capture);

    scanPreview = (SurfaceView) findViewById(R.id.capture_preview);
    scanContainer = (RelativeLayout) findViewById(R.id.capture_container);
    scanCropView = (RelativeLayout) findViewById(R.id.capture_crop_view);
    scanLine = (ImageView) findViewById(R.id.capture_scan_line);

    inactivityTimer = new InactivityTimer(this);
    beepManager = new BeepManager(this);

    TranslateAnimation animation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation
            .RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT,
            0.9f);
    animation.setDuration(4500);
    animation.setRepeatCount(-1);
    animation.setRepeatMode(Animation.RESTART);
    scanLine.startAnimation(animation);
}
 

import com.xys.libzxing.R; //导入依赖的package包/类
@Override
public void handleMessage(Message message) {
    if (message.what == R.id.restart_preview) {
        restartPreviewAndDecode();

    } else if (message.what == R.id.decode_succeeded) {
        state = State.SUCCESS;
        Bundle bundle = message.getData();

        activity.handleDecode((Result) message.obj, bundle);

    } else if (message.what == R.id.decode_failed) {// We're decoding as fast as possible, so when one
        // decode fails,
        // start another.
        state = State.PREVIEW;
        cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);

    } else if (message.what == R.id.return_scan_result) {
        activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
        activity.finish();

    }
}
 

import com.xys.libzxing.R; //导入依赖的package包/类
public void quitSynchronously() {
    state = State.DONE;
    cameraManager.stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    quit.sendToTarget();
    try {
        // Wait at most half a second; should be enough time, and onPause()
        // will timeout quickly
        decodeThread.join(500L);
    } catch (InterruptedException e) {
        // continue
    }

    // Be absolutely sure we don't send any queued up messages
    removeMessages(R.id.decode_succeeded);
    removeMessages(R.id.decode_failed);
}
 

import com.xys.libzxing.R; //导入依赖的package包/类
@Override
public void onCreate(Bundle icicle) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(icicle);

    Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.activity_capture);

    scanPreview = (SurfaceView) findViewById(R.id.capture_preview);
    scanContainer = (RelativeLayout) findViewById(R.id.capture_container);
    scanCropView = (RelativeLayout) findViewById(R.id.capture_crop_view);
    scanLine = (ImageView) findViewById(R.id.capture_scan_line);

    inactivityTimer = new InactivityTimer(this);
    beepManager = new BeepManager(this);

    TranslateAnimation animation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation
            .RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT,
            0.9f);
    animation.setDuration(4500);
    animation.setRepeatCount(-1);
    animation.setRepeatMode(Animation.RESTART);
    scanLine.startAnimation(animation);
}
 

import com.xys.libzxing.R; //导入依赖的package包/类
@Override
public void handleMessage(Message message) {
    if (!running) {
        return;
    }
    if (message.what == R.id.decode) {
        decode((byte[]) message.obj, message.arg1, message.arg2);

    } else if (message.what == R.id.quit) {
        running = false;
        Looper.myLooper().quit();

    }
}
 

import com.xys.libzxing.R; //导入依赖的package包/类
private void restartPreviewAndDecode() {
    if (state == State.SUCCESS) {
        state = State.PREVIEW;
        cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
    }
}
 

import com.xys.libzxing.R; //导入依赖的package包/类
public void restartPreviewAfterDelay(long delayMS) {
    if (handler != null) {
        handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);
    }
}