Android Open Source - geoar-app Map Activity Context

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License

The source code is released under:

Apache License

Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 *// ww  w. ja  v a2  s .com
 * 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 org.n52.geoar.map.view;

import java.lang.reflect.Field;

import org.mapsforge.android.maps.MapActivity;
import org.mapsforge.android.maps.MapView;

import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.ApplicationInfo;
import android.content.res.Resources;
import android.content.res.Resources.Theme;

/**
 * Special {@link MapActivity} extension which wraps an existing
 * {@link Activity} and passes all relevant {@link Context} calls to the
 * implementations of that activity. This activity has to make sure that
 * {@link MapActivityContext#destroy()}, {@link MapActivityContext#resume()} and
 * {@link MapActivityContext#pause()} get called.
 * 
 * This allows to safely use a {@link MapView} even if it is not added to a
 * {@link MapActivity}.
 * 
 * @author Holger Hopmann
 * 
 */
public class MapActivityContext extends MapActivity {

  private final Activity activity;

  public MapActivityContext(Activity activity) {
    this.activity = activity;

    try {
      // try to set base context as passed activity for the case of calls
      // to getters which were not overridden explicitly by require mBase field
      attachBaseContext(activity);
    } catch (IllegalStateException e) {

    }

    try {

      // The private _final_ method getApplication has to return the
      // fragment's activity's application, so use reflection to get
      // the mApplication field and change it to that value
      Field applicationField = Activity.class
          .getDeclaredField("mApplication"); // Could change...
      applicationField.setAccessible(true);
      applicationField.set(this, activity.getApplication());

    } catch (NoSuchFieldException e) {
      e.printStackTrace();
    } catch (IllegalArgumentException e) {
      e.printStackTrace();
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    }

  }

  public void destroy() {
    onDestroy();
  }

  public void pause() {
    onPause();
  }

  public void resume() {
    onResume();
  }

  @Override
  public Resources getResources() {
    return activity.getResources();
  }

  @Override
  public ApplicationInfo getApplicationInfo() {
    return activity.getApplicationInfo();
  }

  @Override
  public Theme getTheme() {
    return activity.getTheme();
  }

  @Override
  public Context getBaseContext() {
    return activity.getBaseContext();
  }

  @Override
  public Object getSystemService(String name) {
    return activity.getSystemService(name);
  }

  @Override
  public SharedPreferences getSharedPreferences(String name, int mode) {
    return activity.getSharedPreferences(name, mode);
  }

  @Override
  public ContentResolver getContentResolver() {
    return activity.getContentResolver();
  }
}

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