Farm out beep/vibrate stuff to class to try to reduce CaptureActivity complexity

[zxing.git] / android / src / com / google / zxing / client / android / BeepManager.java

diff --git a/android/src/com/google/zxing/client/android/BeepManager.java b/android/src/com/google/zxing/client/android/BeepManager.java
new file mode 100644 (file)
index 0000000..0e8ee88
--- /dev/null
+++ b/android/src/com/google/zxing/client/android/BeepManager.java
@@ -0,0 +1,109 @@
+/*
+ * 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.google.zxing.client.android;
+
+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.IOException;
+
+/**
+ * Manages beeps and vibrations for {@link CaptureActivity}.
+ */
+public final class BeepManager {
+
+  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();
+  }
+
+  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);
+    }
+  }
+
+  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 static MediaPlayer buildMediaPlayer(Context activity) {
+    MediaPlayer mediaPlayer = new MediaPlayer();
+    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
+    // When the beep has finished playing, rewind to queue up another one.
+    mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
+      public void onCompletion(MediaPlayer player) {
+        player.seekTo(0);
+      }
+    });
+
+    AssetFileDescriptor file = activity.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 ioe) {
+      Log.w(TAG, ioe);
+      mediaPlayer = null;
+    }
+    return mediaPlayer;
+  }
+
+}