Issue 376: re-set camera params after first auto-focus callback to make it work on...

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

diff --git a/android/src/com/google/zxing/client/android/camera/AutoFocusCallback.java b/android/src/com/google/zxing/client/android/camera/AutoFocusCallback.java
new file mode 100644 (file)
index 0000000..fb3dd04
--- /dev/null
+++ b/android/src/com/google/zxing/client/android/camera/AutoFocusCallback.java
@@ -0,0 +1,55 @@
+/*
+ * 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.camera;
+
+import android.hardware.Camera;
+import android.os.Handler;
+import android.os.Message;
+
+final class AutoFocusCallback implements Camera.AutoFocusCallback {
+
+  private static final long AUTOFOCUS_INTERVAL_MS = 1500L;
+
+  private final CameraConfigurationManager configManager;
+  private boolean reinitCamera;
+  private Handler autoFocusHandler;
+  private int autoFocusMessage;
+
+  AutoFocusCallback(CameraConfigurationManager configManager) {
+    this.configManager = configManager;
+  }
+
+  void setHandler(Handler autoFocusHandler, int autoFocusMessage) {
+    this.autoFocusHandler = autoFocusHandler;
+    this.autoFocusMessage = autoFocusMessage;
+  }
+
+  public void onAutoFocus(boolean success, Camera camera) {
+    if (autoFocusHandler != null) {
+      Message message = autoFocusHandler.obtainMessage(autoFocusMessage, success);
+      // Simulate continuous autofocus by sending a focus request every
+      // AUTOFOCUS_INTERVAL_MS milliseconds.
+      autoFocusHandler.sendMessageDelayed(message, AUTOFOCUS_INTERVAL_MS);
+      autoFocusHandler = null;
+      if (!reinitCamera) {
+        reinitCamera = true;
+        configManager.setDesiredCameraParameters(camera);
+      }
+    }
+  }
+
+}