android开源项目之OTTO事件总线（二）官方demo解说

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                /*
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                 * Copyright (C) 2012 Square, Inc.

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                 *

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                 * Licensed under the Apache License, Version 2.0 (the "License");

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                 * you may not use this file except in compliance with the License.

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                 * You may obtain a copy of the License at

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                 *

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                 * 
                http://www.apache.org/licenses/LICENSE-2.0
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                 *

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                 * Unless required by applicable law or agreed to in writing, software

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                 * distributed under the License is distributed on an "AS IS" BASIS,

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                 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

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                 * See the License for the specific language governing permissions and

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                 * limitations under the License.

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                */
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                package com.squareup.otto.sample;

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                import com.squareup.otto.Bus;

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                /*
                *

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                 * Maintains a singleton instance for obtaining the bus. Ideally this would be replaced with a more efficient means

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                 * such as through injection directly into interested classes.

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                */
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                public final class BusProvider {
26privatestatic final Bus BUS = new Bus();
2728publicstatic Bus getInstance() {
29return BUS;
30  }
3132private BusProvider() {
33// No instances.34  }
35 }

  findViewById(R.id.clear_location).setOnClickListener(new OnClickListener() {
      @Override publicvoid onClick(View v) {
        // Tell everyone to clear their location history.
          //清除位置
        BusProvider.getInstance().post(new LocationClearEvent());

        // Post new location event for the default location.
        //重新加载默认的位置
        lastLatitude = DEFAULT_LAT;
        lastLongitude = DEFAULT_LON;
        BusProvider.getInstance().post(produceLocationEvent());
      }
    });

                 1   @Override protectedvoid onResume() {
 2    super.onResume();
 3 4// Register ourselves so that we can provide the initial value. 5     BusProvider.getInstance().register(this);
 6  }
 7 8   @Override protectedvoid onPause() {
 9    super.onPause();
1011// Always unregister when an object no longer should be on the bus.12     BusProvider.getInstance().unregister(this);
13   }

  @Subscribe publicvoid onLocationChanged(LocationChangedEvent event) {
    locationEvents.add(0, event.toString());
    if (adapter != null) {
      adapter.notifyDataSetChanged();
    }
  }

  @Subscribe publicvoid onLocationCleared(LocationClearEvent event) {
    locationEvents.clear();
    if (adapter != null) {
      adapter.notifyDataSetChanged();
    }