TrackDetailView: show connected bluetooth device.

src/main/java/com/google/android/apps/mytracks/DeleteAsyncTask.java

@@ -0,0 +1,95 @@
+package com.google.android.apps.mytracks;
+
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.
+ */
+
+import android.content.Context;
+import android.os.AsyncTask;
+
+import com.google.android.apps.mytracks.content.MyTracksProviderUtils;
+
+/**
+ * Async Task to delete tracks.
+ * 
+ * @author Jimmy Shih
+ */
+public class DeleteAsyncTask extends AsyncTask<Void, Integer, Boolean> {
+
+  private DeleteActivity deleteActivity;
+  private final long[] trackIds;
+  private final Context context;
+
+  // true if the AsyncTask has completed
+  private boolean completed;
+
+  /**
+   * Creates an AsyncTask.
+   * 
+   * @param deleteActivity the activity currently associated with this task
+   * @param trackIds the track ids to delete. To delete all, set to size 1 with
+   *          trackIds[0] == -1L
+   */
+  public DeleteAsyncTask(DeleteActivity deleteActivity, long[] trackIds) {
+    this.deleteActivity = deleteActivity;
+    this.trackIds = trackIds;
+    context = deleteActivity.getApplicationContext();
+    completed = false;
+  }
+
+  /**
+   * Sets the current activity associated with this AyncTask.
+   * 
+   * @param deleteActivity the current activity, can be null
+   */
+  public void setActivity(DeleteActivity deleteActivity) {
+    this.deleteActivity = deleteActivity;
+    if (completed && deleteActivity != null) {
+      deleteActivity.onAsyncTaskCompleted();
+    }
+  }
+
+  @Override
+  protected void onPreExecute() {
+    if (deleteActivity != null) {
+      deleteActivity.showProgressDialog();
+    }
+  }
+
+  @Override
+  protected Boolean doInBackground(Void... params) {
+    MyTracksProviderUtils myTracksProviderUtils = MyTracksProviderUtils.Factory.get(context);
+
+    if (trackIds.length == 1 && trackIds[0] == -1L) {
+      myTracksProviderUtils.deleteAllTracks(context);
+    } else {
+      for (long id : trackIds) {
+        if (isCancelled()) {
+          return false;
+        }
+        myTracksProviderUtils.deleteTrack(context, id);
+      }
+    }
+    return true;
+  }
+
+  @Override
+  protected void onPostExecute(Boolean result) {
+    completed = true;
+    if (deleteActivity != null) {
+      deleteActivity.onAsyncTaskCompleted();
+    }
+  }
+}