CaptureActivity.java

/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android;

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

import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
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.Vibrator;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.bitcoinandroid.R;
import com.bitcoinandroid.SendMoney;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.ResultMetadataType;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.android.camera.CameraManager;

/**
 * The barcode reader activity itself. This is loosely based on the
 * CameraPreview example included in the Android SDK.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public final class CaptureActivity extends Activity implements
		SurfaceHolder.Callback {

	private static final String TAG = CaptureActivity.class.getSimpleName();

	private static final float BEEP_VOLUME = 0.10f;
	private static final long VIBRATE_DURATION = 200L;

	private static final String PRODUCT_SEARCH_URL_PREFIX = "http://www.google";
	private static final String PRODUCT_SEARCH_URL_SUFFIX = "/m/products/scan";
	private static final String ZXING_URL = "http://zxing.appspot.com/scan";

	private static final Set<ResultMetadataType> DISPLAYABLE_METADATA_TYPES;
	static {
		DISPLAYABLE_METADATA_TYPES = new HashSet<ResultMetadataType>(5);
		DISPLAYABLE_METADATA_TYPES.add(ResultMetadataType.ISSUE_NUMBER);
		DISPLAYABLE_METADATA_TYPES.add(ResultMetadataType.SUGGESTED_PRICE);
		DISPLAYABLE_METADATA_TYPES
				.add(ResultMetadataType.ERROR_CORRECTION_LEVEL);
		DISPLAYABLE_METADATA_TYPES.add(ResultMetadataType.POSSIBLE_COUNTRY);
	}

	private enum Source {
		NATIVE_APP_INTENT, PRODUCT_SEARCH_LINK, ZXING_LINK, NONE
	}

	private CaptureActivityHandler handler;

	private ViewfinderView viewfinderView;
	private TextView statusView;
	private MediaPlayer mediaPlayer;
	private Result lastResult;
	private boolean hasSurface;
	private boolean playBeep;
	private boolean vibrate;
	private Source source;
	private String sourceUrl;
	private Vector<BarcodeFormat> decodeFormats;
	private String characterSet;
	private InactivityTimer inactivityTimer;

	/**
	 * 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);
		}
	};

	ViewfinderView getViewfinderView() {
		return viewfinderView;
	}

	public Handler getHandler() {
		return handler;
	}

	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);

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

		Animation anim = AnimationUtils.loadAnimation(this, R.anim.rotate);
		anim.setFillAfter(true);
		TextView fl = (TextView) findViewById(R.id.status_view);
		fl.startAnimation(anim);
		Button manualButton = (Button) findViewById(R.id.manual_button);
		manualButton.startAnimation(anim);
		
		manualButton.setOnClickListener(new View.OnClickListener() {
	        public void onClick(View v) {
	        	startActivity(new Intent(CaptureActivity.this, SendMoney.class));
	        }
	    });

		CameraManager.init(getApplication());
		viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
		statusView = (TextView) findViewById(R.id.status_view);
		handler = null;
		lastResult = null;
		hasSurface = false;
		inactivityTimer = new InactivityTimer(this);

		// showHelpOnFirstLaunch();
	}

	@Override
	protected void onResume() {
		super.onResume();
		resetStatusView();

		SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
		SurfaceHolder surfaceHolder = surfaceView.getHolder();
		if (hasSurface) {
			// The activity was paused but not stopped, so the surface still
			// exists. Therefore
			// surfaceCreated() won't be called, so init the camera here.
			initCamera(surfaceHolder);
		} else {
			// Install the callback and wait for surfaceCreated() to init the
			// camera.
			surfaceHolder.addCallback(this);
			surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		}

		Intent intent = getIntent();
		String action = intent == null ? null : intent.getAction();
		String dataString = intent == null ? null : intent.getDataString();
		if (intent != null && action != null) {
			if (action.equals(Intents.Scan.ACTION)) {
				// Scan the formats the intent requested, and return the result
				// to the calling activity.
				source = Source.NATIVE_APP_INTENT;
				decodeFormats = DecodeFormatManager.parseDecodeFormats(intent);
			} else if (dataString != null
					&& dataString.contains(PRODUCT_SEARCH_URL_PREFIX)
					&& dataString.contains(PRODUCT_SEARCH_URL_SUFFIX)) {
				// Scan only products and send the result to mobile Product
				// Search.
				source = Source.PRODUCT_SEARCH_LINK;
				sourceUrl = dataString;
				decodeFormats = DecodeFormatManager.PRODUCT_FORMATS;
			} else if (dataString != null && dataString.startsWith(ZXING_URL)) {
				// Scan formats requested in query string (all formats if none
				// specified).
				// If a return URL is specified, send the results there.
				// Otherwise, handle it ourselves.
				source = Source.ZXING_LINK;
				sourceUrl = dataString;
				Uri inputUri = Uri.parse(sourceUrl);
				decodeFormats = DecodeFormatManager
						.parseDecodeFormats(inputUri);
			} else {
				// Scan all formats and handle the results ourselves (launched
				// from Home).
				source = Source.NONE;
				decodeFormats = null;
			}
			characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);
		} else {
			source = Source.NONE;
			decodeFormats = null;
			characterSet = null;
		}

		playBeep = true;
		if (playBeep) {
			// See if sound settings overrides this
			AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
			if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
				playBeep = false;
			}
		}
		vibrate = false;
		initBeepSound();
	}

	@Override
	protected void onPause() {
		super.onPause();
		if (handler != null) {
			handler.quitSynchronously();
			handler = null;
		}
		CameraManager.get().closeDriver();
	}

	@Override
	protected void onDestroy() {
		inactivityTimer.shutdown();
		super.onDestroy();
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			if (source == Source.NATIVE_APP_INTENT) {
				setResult(RESULT_CANCELED);
				finish();
				return true;
			} else if ((source == Source.NONE || source == Source.ZXING_LINK)
					&& lastResult != null) {
				resetStatusView();
				if (handler != null) {
					handler.sendEmptyMessage(R.id.restart_preview);
				}
				return true;
			}
		} else if (keyCode == KeyEvent.KEYCODE_FOCUS
				|| keyCode == KeyEvent.KEYCODE_CAMERA) {
			// Handle these events so they don't launch the Camera app
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}	


	@Override
	public void onConfigurationChanged(Configuration config) {
		// Do nothing, this is to prevent the activity from being restarted when
		// the keyboard opens.
		super.onConfigurationChanged(config);
	}

	public void surfaceCreated(SurfaceHolder holder) {
		if (!hasSurface) {
			hasSurface = true;
			initCamera(holder);
		}
	}

	public void surfaceDestroyed(SurfaceHolder holder) {
		hasSurface = false;
	}

	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {

	}

	/**
	 * A valid barcode has been found, so give an indication of success and show
	 * the results.
	 * 
	 * @param rawResult
	 *            The contents of the barcode.
	 * @param barcode
	 *            A greyscale bitmap of the camera data which was decoded.
	 */
	public void handleDecode(Result rawResult, Bitmap barcode) {
		inactivityTimer.onActivity();
		lastResult = rawResult;
		if (barcode == null) {
			// This is from history -- no saved barcode
			throw new Error("shouldn't get here");
		} else {
			playBeepSoundAndVibrate();
			drawResultPoints(barcode, rawResult);

			try {
				Bundle b = new Bundle();
				String link = rawResult.getText();
				if (!link.startsWith("bitcoin:")) {
					throw new RuntimeException("Trigger reset");
				}

				String[] parts = link.split(":");
				parts = parts[1].split("\\?");
				b.putString("address", parts[0]);
				if (parts.length > 1) {
					parts = parts[1].split("&");
					String[] pair;
					for (int i = 0; i < parts.length; i++) {
						pair = parts[i].split("=");
						b.putString(pair[0], pair[1]);
					}
				}

				Intent intent = new Intent(CaptureActivity.this,
						SendMoney.class);
				intent.putExtras(b);
				startActivity(intent);
			} catch (Exception e) {
				 Toast.makeText(this,
				 "Not a valid Bitcoin address.  Please try again.",
				 Toast.LENGTH_LONG).show();

				resetStatusView();
				// sleep 3 seconds before restarting scanning
				handler.postDelayed(new Runnable() {
					public void run() {
						if (handler != null) {
							handler.sendEmptyMessage(R.id.restart_preview);
						}
					}
				}, 3000);
			}
		}
	}

	/**
	 * Superimpose a line for 1D or dots for 2D to highlight the key features of
	 * the barcode.
	 * 
	 * @param barcode
	 *            A bitmap of the captured image.
	 * @param rawResult
	 *            The decoded results which contains the points to draw.
	 */
	private void drawResultPoints(Bitmap barcode, Result rawResult) {
		ResultPoint[] points = rawResult.getResultPoints();
		if (points != null && points.length > 0) {
			Canvas canvas = new Canvas(barcode);
			Paint paint = new Paint();
			paint.setColor(getResources().getColor(R.color.result_image_border));
			paint.setStrokeWidth(3.0f);
			paint.setStyle(Paint.Style.STROKE);
			Rect border = new Rect(2, 2, barcode.getWidth() - 2,
					barcode.getHeight() - 2);
			canvas.drawRect(border, paint);

			paint.setColor(getResources().getColor(R.color.result_points));
			if (points.length == 2) {
				paint.setStrokeWidth(4.0f);
				drawLine(canvas, paint, points[0], points[1]);
			} else if (points.length == 4
					&& (rawResult.getBarcodeFormat()
							.equals(BarcodeFormat.UPC_A))
					|| (rawResult.getBarcodeFormat()
							.equals(BarcodeFormat.EAN_13))) {
				// Hacky special case -- draw two lines, for the barcode and
				// metadata
				drawLine(canvas, paint, points[0], points[1]);
				drawLine(canvas, paint, points[2], points[3]);
			} else {
				paint.setStrokeWidth(10.0f);
				for (ResultPoint point : points) {
					canvas.drawPoint(point.getX(), point.getY(), paint);
				}
			}
		}
	}

	private static void drawLine(Canvas canvas, Paint paint, ResultPoint a,
			ResultPoint b) {
		canvas.drawLine(a.getX(), a.getY(), b.getX(), b.getY(), paint);
	}

	/**
	 * Creates the beep MediaPlayer in advance so that the sound can be
	 * triggered with the least latency possible.
	 */
	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 void playBeepSoundAndVibrate() {
		if (playBeep && mediaPlayer != null) {
			mediaPlayer.start();
		}
		if (vibrate) {
			Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
			vibrator.vibrate(VIBRATE_DURATION);
		}
	}

	private void initCamera(SurfaceHolder surfaceHolder) {
		try {
			CameraManager.get().openDriver(surfaceHolder);
		} catch (IOException ioe) {
			Log.w(TAG, ioe);
			return;
		} catch (RuntimeException e) {
			// Barcode Scanner has seen crashes in the wild of this variety:
			// java.?lang.?RuntimeException: Fail to connect to camera service
			Log.w(TAG, "Unexpected error initializating camera", e);
			return;
		}
		if (handler == null) {
			handler = new CaptureActivityHandler(this, decodeFormats,
					characterSet);
		}
	}

	private void resetStatusView() {
		statusView.setText(R.string.msg_default_status);
		statusView.setVisibility(View.VISIBLE);
		viewfinderView.setVisibility(View.VISIBLE);
		lastResult = null;
	}

	public void drawViewfinder() {
		viewfinderView.drawViewfinder();
	}
}