first

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches/build_file_checksums.ser
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId "com.scy.cameralib"
+        minSdkVersion 19
+        targetSdkVersion 28
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/scy/cameralib/ExampleInstrumentedTest.java

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+package com.scy.cameralib;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.scy.cameralib", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.scy.cameralib">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/scy/cameralib/AutoFocusManager.java

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+/*
+ * Copyright (C) 2012 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.scy.cameralib;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.hardware.Camera;
+import android.os.AsyncTask;
+import android.preference.PreferenceManager;
+import android.util.Log;
+
+import com.google.zxing.client.android.PreferencesActivity;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.concurrent.RejectedExecutionException;
+
+@SuppressWarnings("deprecation") // camera APIs
+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<>(2);
+    FOCUS_MODES_CALLING_AF.add(Camera.Parameters.FOCUS_MODE_AUTO);
+    FOCUS_MODES_CALLING_AF.add(Camera.Parameters.FOCUS_MODE_MACRO);
+  }
+
+  private boolean stopped;
+  private boolean focusing;
+  private final boolean useAutoFocus;
+  private final Camera camera;
+  private AsyncTask<?,?,?> outstandingTask;
+
+  AutoFocusManager(Context context, Camera camera) {
+    this.camera = camera;
+    SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
+    String currentFocusMode = camera.getParameters().getFocusMode();
+    useAutoFocus =
+        sharedPrefs.getBoolean(PreferencesActivity.KEY_AUTO_FOCUS, true) &&
+        FOCUS_MODES_CALLING_AF.contains(currentFocusMode);
+    Log.i(TAG, "Current focus mode '" + currentFocusMode + "'; use auto focus? " + useAutoFocus);
+    start();
+  }
+
+  @Override
+  public synchronized void onAutoFocus(boolean success, Camera theCamera) {
+    focusing = false;
+    autoFocusAgainLater();
+  }
+
+  private synchronized void autoFocusAgainLater() {
+    if (!stopped && outstandingTask == null) {
+      AutoFocusTask newTask = new AutoFocusTask();
+      try {
+        newTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+        outstandingTask = newTask;
+      } catch (RejectedExecutionException ree) {
+        Log.w(TAG, "Could not request auto focus", ree);
+      }
+    }
+  }
+
+  synchronized void start() {
+    if (useAutoFocus) {
+      outstandingTask = null;
+      if (!stopped && !focusing) {
+        try {
+          camera.autoFocus(this);
+          focusing = true;
+        } catch (RuntimeException re) {
+          // Have heard RuntimeException reported in Android 4.0.x+; continue?
+          Log.w(TAG, "Unexpected exception while focusing", re);
+          // Try again later to keep cycle going
+          autoFocusAgainLater();
+        }
+      }
+    }
+  }
+
+  private synchronized void cancelOutstandingTask() {
+    if (outstandingTask != null) {
+      if (outstandingTask.getStatus() != AsyncTask.Status.FINISHED) {
+        outstandingTask.cancel(true);
+      }
+      outstandingTask = null;
+    }
+  }
+
+  synchronized void stop() {
+    stopped = true;
+    if (useAutoFocus) {
+      cancelOutstandingTask();
+      // Doesn't hurt to call this even if not focusing
+      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);
+      }
+    }
+  }
+
+  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
+      }
+      start();
+      return null;
+    }
+  }
+
+}

app/src/main/java/com/scy/cameralib/BeepManager.java

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+/*
+ * Copyright (C) 2010 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.scy.cameralib;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.AssetFileDescriptor;
+import android.media.AudioManager;
+import android.media.MediaPlayer;
+import android.os.Vibrator;
+import android.preference.PreferenceManager;
+import android.util.Log;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+/**
+ * Manages beeps and vibrations for {@link CaptureActivity}.
+ */
+final class BeepManager implements MediaPlayer.OnErrorListener, Closeable {
+
+  private static final String TAG = BeepManager.class.getSimpleName();
+
+  private static final float BEEP_VOLUME = 0.10f;
+  private static final long VIBRATE_DURATION = 200L;
+
+  private final Activity activity;
+  private MediaPlayer mediaPlayer;
+  private boolean playBeep;
+  private boolean vibrate;
+
+  BeepManager(Activity activity) {
+    this.activity = activity;
+    this.mediaPlayer = null;
+    updatePrefs();
+  }
+
+  synchronized void updatePrefs() {
+    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(activity);
+    playBeep = shouldBeep(prefs, activity);
+    vibrate = prefs.getBoolean(PreferencesActivity.KEY_VIBRATE, false);
+    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.
+      activity.setVolumeControlStream(AudioManager.STREAM_MUSIC);
+      mediaPlayer = buildMediaPlayer(activity);
+    }
+  }
+
+  synchronized void playBeepSoundAndVibrate() {
+    if (playBeep && mediaPlayer != null) {
+      mediaPlayer.start();
+    }
+    if (vibrate) {
+      Vibrator vibrator = (Vibrator) activity.getSystemService(Context.VIBRATOR_SERVICE);
+      vibrator.vibrate(VIBRATE_DURATION);
+    }
+  }
+
+  private static boolean shouldBeep(SharedPreferences prefs, Context activity) {
+    boolean shouldPlayBeep = prefs.getBoolean(PreferencesActivity.KEY_PLAY_BEEP, true);
+    if (shouldPlayBeep) {
+      // See if sound settings overrides this
+      AudioManager audioService = (AudioManager) activity.getSystemService(Context.AUDIO_SERVICE);
+      if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
+        shouldPlayBeep = false;
+      }
+    }
+    return shouldPlayBeep;
+  }
+
+  private MediaPlayer buildMediaPlayer(Context activity) {
+    MediaPlayer mediaPlayer = new MediaPlayer();
+    try (AssetFileDescriptor file = activity.getResources().openRawResourceFd(R.raw.beep)) {
+      mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
+      mediaPlayer.setOnErrorListener(this);
+      mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
+      mediaPlayer.setLooping(false);
+      mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
+      mediaPlayer.prepare();
+      return mediaPlayer;
+    } catch (IOException ioe) {
+      Log.w(TAG, ioe);
+      mediaPlayer.release();
+      return null;
+    }
+  }
+
+  @Override
+  public synchronized boolean onError(MediaPlayer mp, int what, int extra) {
+    if (what == MediaPlayer.MEDIA_ERROR_SERVER_DIED) {
+      // we are finished, so put up an appropriate error toast if required and finish
+      activity.finish();
+    } else {
+      // possibly media player error, so release and recreate
+      close();
+      updatePrefs();
+    }
+    return true;
+  }
+
+  @Override
+  public synchronized void close() {
+    if (mediaPlayer != null) {
+      mediaPlayer.release();
+      mediaPlayer = null;
+    }
+  }
+
+}