Move reverse geocoder to AsyncTask and update location information asynchronously.

1 files changed, 75 insertions, 0 deletions

diff --git a/src/com/android/camera/ReverseGeocoderTask.java b/src/com/android/camera/ReverseGeocoderTask.java
new file mode 100644
index 0000000..97f5978
--- /dev/null
+++ b/src/com/android/camera/ReverseGeocoderTask.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * 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.camera;
+
+import android.location.Address;
+import android.location.Geocoder;
+import android.os.AsyncTask;
+import android.util.Log;
+
+import java.io.IOException;
+import java.util.List;
+
+// Reverse geocoding may take a long time to return so we put it in AsyncTask.
+public class ReverseGeocoderTask extends AsyncTask<Void, Void, String> {
+    private static final String TAG = "ReverseGeocoder";
+
+    public static interface Callback {
+        public void onComplete(String location);
+    }
+
+    private Geocoder mGeocoder;
+    private float mLat;
+    private float mLng;
+    private Callback mCallback;
+
+    public ReverseGeocoderTask(Geocoder geocoder, float[] latlng,
+            Callback callback) {
+        mGeocoder = geocoder;
+        mLat = latlng[0];
+        mLng = latlng[1];
+        mCallback = callback;
+    }
+
+    @Override
+    protected String doInBackground(Void... params) {
+        String value = MenuHelper.EMPTY_STRING;
+        try {
+            List<Address> address =
+                    mGeocoder.getFromLocation(mLat, mLng, 1);
+            StringBuilder sb = new StringBuilder();
+            for (Address addr : address) {
+                int index = addr.getMaxAddressLineIndex();
+                sb.append(addr.getAddressLine(index));
+            }
+            value = sb.toString();
+        } catch (IOException ex) {
+            value = MenuHelper.EMPTY_STRING;
+            Log.e(TAG, "Geocoder exception: ", ex);
+        } catch (RuntimeException ex) {
+            value = MenuHelper.EMPTY_STRING;
+            Log.e(TAG, "Geocoder exception: ", ex);
+        }
+        return value;
+    }
+
+    @Override
+    protected void onPostExecute(String location) {
+        mCallback.onComplete(location);
+    }
+}
+