Android Open Source - GlassCounter Auto Focus Manager






From Project

Back to project page GlassCounter.

License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2012 ZXing authors/*from  w  ww  .  ja v  a2  s.c o m*/
 *
 * 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.camera;

import java.util.ArrayList;
import java.util.Collection;

import android.content.Context;
import android.content.SharedPreferences;
import android.hardware.Camera;
import android.os.AsyncTask;
import android.preference.PreferenceManager;
import android.util.Log;

final class AutoFocusManager implements Camera.AutoFocusCallback {

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

  private static final long AUTO_FOCUS_INTERVAL_MS = 2000L;
  private static final Collection<String> FOCUS_MODES_CALLING_AF;
  static {
    FOCUS_MODES_CALLING_AF = new ArrayList<String>(2);
    FOCUS_MODES_CALLING_AF.add(Camera.Parameters.FOCUS_MODE_AUTO);
    FOCUS_MODES_CALLING_AF.add(Camera.Parameters.FOCUS_MODE_MACRO);
  }

  private boolean active;
  private final boolean useAutoFocus;
  private final Camera camera;
  private AsyncTask<?,?,?> outstandingTask;

  AutoFocusManager(Context context, Camera camera) {
    this.camera = camera;
    @SuppressWarnings("unused")
  SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
    String currentFocusMode = camera.getParameters().getFocusMode();
    useAutoFocus = FOCUS_MODES_CALLING_AF.contains(currentFocusMode);
    Log.i(TAG, "Current focus mode '" + currentFocusMode + "'; use auto focus? " + useAutoFocus);
    start();
  }

  @SuppressWarnings("unchecked")
@Override
  public synchronized void onAutoFocus(boolean success, Camera theCamera) {
    if (active) {
      outstandingTask = new AutoFocusTask();
      outstandingTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
    }
  }

  synchronized void start() {
    if (useAutoFocus) {
      active = true;
      try {
        camera.autoFocus(this);
      } catch (RuntimeException re) {
        // Have heard RuntimeException reported in Android 4.0.x+; continue?
        Log.w(TAG, "Unexpected exception while focusing", re);
      }
    }
  }

  synchronized void stop() {
    if (useAutoFocus) {
      try {
        camera.cancelAutoFocus();
      } catch (RuntimeException re) {
        // Have heard RuntimeException reported in Android 4.0.x+; continue?
        Log.w(TAG, "Unexpected exception while cancelling focusing", re);
      }
    }
    if (outstandingTask != null) {
      outstandingTask.cancel(true);
      outstandingTask = null;
    }
    active = false;
  }

  private final class AutoFocusTask extends AsyncTask<Object,Object,Object> {
    @Override
    protected Object doInBackground(Object... voids) {
      try {
        Thread.sleep(AUTO_FOCUS_INTERVAL_MS);
      } catch (InterruptedException e) {
        // continue
      }
      synchronized (AutoFocusManager.this) {
        if (active) {
          start();
        }
      }
      return null;
    }
  }

}




Java Source Code List

com.github.barcodeeye.BaseGlassActivity.java
com.github.barcodeeye.LaunchActivity.java
com.github.barcodeeye.image.ImageManager.java
com.github.barcodeeye.migrated.AmbientLightManager.java
com.github.barcodeeye.migrated.BeepManager.java
com.github.barcodeeye.migrated.DecodeFormatManager.java
com.github.barcodeeye.migrated.DecodeHintManager.java
com.github.barcodeeye.migrated.FinishListener.java
com.github.barcodeeye.migrated.HttpHelper.java
com.github.barcodeeye.migrated.InactivityTimer.java
com.github.barcodeeye.migrated.Intents.java
com.github.barcodeeye.migrated.LocaleManager.java
com.github.barcodeeye.scan.CaptureActivityHandler.java
com.github.barcodeeye.scan.CaptureActivity.java
com.github.barcodeeye.scan.DecodeHandler.java
com.github.barcodeeye.scan.DecodeThread.java
com.github.barcodeeye.scan.FinalActivity.java
com.github.barcodeeye.scan.FourthActivity.java
com.github.barcodeeye.scan.ResultsActivity.java
com.github.barcodeeye.scan.api.CardPresenter.java
com.github.barcodeeye.scan.result.ResultProcessorFactory.java
com.github.barcodeeye.scan.result.ResultProcessor.java
com.github.barcodeeye.scan.result.internal.IsbnResultProcessor.java
com.github.barcodeeye.scan.result.internal.ProductResultProcessor.java
com.github.barcodeeye.scan.result.internal.TextResultProcessor.java
com.github.barcodeeye.scan.result.internal.UriResultProcessor.java
com.github.barcodeeye.scan.result.supplement.AmazonInfoRetriever.java
com.github.barcodeeye.scan.result.supplement.BookResultInfoRetriever.java
com.github.barcodeeye.scan.result.supplement.ProductResultInfoRetriever.java
com.github.barcodeeye.scan.result.supplement.SupplementalInfoRetriever.java
com.github.barcodeeye.scan.result.supplement.TitleRetriever.java
com.github.barcodeeye.scan.result.supplement.URIResultInfoRetriever.java
com.github.barcodeeye.scan.ui.ViewfinderView.java
com.google.zxing.client.android.camera.AutoFocusManager.java
com.google.zxing.client.android.camera.CameraConfigurationManager.java
com.google.zxing.client.android.camera.CameraManager.java
com.google.zxing.client.android.camera.PreviewCallback.java
com.google.zxing.client.android.camera.open.OpenCameraInterface.java
com.google.zxing.client.android.clipboard.ClipboardInterface.java
com.google.zxing.client.android.encode.ContactEncoder.java
com.google.zxing.client.android.encode.Formatter.java
com.google.zxing.client.android.encode.MECARDContactEncoder.java
com.google.zxing.client.android.encode.VCardContactEncoder.java
com.google.zxing.client.android.history.DBHelper.java
com.google.zxing.client.android.history.HistoryItemAdapter.java
com.google.zxing.client.android.history.HistoryItem.java
com.google.zxing.client.android.share.AppInfo.java
com.google.zxing.client.android.share.AppPickerActivity.java
com.google.zxing.client.android.share.BookmarkAdapter.java
com.google.zxing.client.android.share.BookmarkPickerActivity.java
com.google.zxing.client.android.share.LoadPackagesAsyncTask.java
com.google.zxing.client.android.wifi.NetworkType.java
com.google.zxing.client.android.wifi.WifiConfigManager.java