Android Open Source - GradleAndroid-App Capture Activity Handler

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2008 ZXing authors/*from w w w.  j  a va  2 s .c om*/
 *
 * 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.android.app.function.qrcode.utils;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import com.android.app.function.R;
import com.android.app.function.qrcode.activity.CaptureActivity;
import com.android.app.function.qrcode.camera.CameraManager;
import com.android.app.function.qrcode.decode.DecodeThread;
import com.google.zxing.Result;

/**
 * This class handles all the messaging which comprises the state machine for
 * capture.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public class CaptureActivityHandler extends Handler {

  private final CaptureActivity activity;
  private final DecodeThread decodeThread;
  private final CameraManager cameraManager;
  private State state;

  private enum State {
    PREVIEW, SUCCESS, DONE
  }

  public CaptureActivityHandler(CaptureActivity activity, CameraManager cameraManager, int decodeMode) {
    this.activity = activity;
    decodeThread = new DecodeThread(activity, decodeMode);
    decodeThread.start();
    state = State.SUCCESS;

    // Start ourselves capturing previews and decoding.
    this.cameraManager = cameraManager;
    cameraManager.startPreview();
    restartPreviewAndDecode();
  }

  @Override
  public void handleMessage(Message message) {
        if (message.what == R.id.qr_restart_preview) {
            restartPreviewAndDecode();

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

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

        } else if (message.what == R.id.qr_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.qr_decode);

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

        }
  }

  public void quitSynchronously() {
    state = State.DONE;
    cameraManager.stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.qr_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.qr_decode_succeeded);
    removeMessages(R.id.qr_decode_failed);
  }

  private void restartPreviewAndDecode() {
    if (state == State.SUCCESS) {
      state = State.PREVIEW;
      cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.qr_decode);
    }
  }

}

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