Android Open Source - NXTControl Activity Host

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License

The source code is released under:

GNU General Public License

Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
///*from  ww w.  ja v  a 2s .com*/
// Copyright (c) 2013, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.bandtec.nxtcontrol.activity;

import android.annotation.TargetApi;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import br.com.bandtec.nxtcontrol.ActivityMain;
import br.com.bandtec.nxtcontrol.ui.CustomContextMenu;
import br.com.bandtec.nxtcontrol.ui.UI;
import br.com.bandtec.nxtcontrol.ui.drawable.ColorDrawable;

//
//Handling Runtime Changes
//http://developer.android.com/guide/topics/resources/runtime-changes.html
//
//<activity> (all attributes, including android:configChanges)
//http://developer.android.com/guide/topics/manifest/activity-element.html
//
public final class ActivityHost extends Activity {
  private ClientActivity top;
  private boolean exitOnDestroy;
  
  public ClientActivity getTopActivity() {
    return top;
  }
  
  public void setExitOnDestroy(boolean exitOnDestroy) {
    this.exitOnDestroy = exitOnDestroy;
  }
  
  public void startActivity(ClientActivity activity) {
    if (top != null) {
      top.onPause();
      top.onCleanupLayout();
    }
    activity.finished = false;
    activity.activity = this;
    activity.previousActivity = top;
    top = activity;
    activity.onCreate();
    activity.onCreateLayout(true);
    activity.onResume();
  }
  
  public void finishActivity(ClientActivity activity, int resultCode, Intent data) {
    if (activity.finished)
      return;
    if (activity != top)
      throw new IllegalStateException("Impossible to finish an activity other than the top most one");
    activity.finished = true;
    activity.onPause();
    activity.onCleanupLayout();
    activity.onDestroy();
    top = top.previousActivity;
    activity.activity = null;
    activity.previousActivity = null;
    if (top == null) {
      finish();
    } else {
      top.onCreateLayout(false);
      top.onResume();
      top.activityFinished(activity, activity.requestCode, resultCode, data);
    }
    System.gc();
  }
  
  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (top != null) {
      top.onActivityResult(requestCode, resultCode, data);
    }
  }
  
  @Override
  public void onBackPressed() {
    if (top != null) {
      if (top.onBackPressed())
        return;
      if (top.previousActivity != null) {
        finishActivity(top, 0, null);
        return;
      }
    }
    super.onBackPressed();
  }
  
  @Override
  public boolean onPrepareOptionsMenu(Menu menu) {
    if (top != null) {
      final View v = top.getNullContextMenuView();
      if (v != null)
        CustomContextMenu.openContextMenu(v, top);
    }
    return false;
  }
  
  @TargetApi(Build.VERSION_CODES.HONEYCOMB)
  private void setupActionBar() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      final ActionBar b = getActionBar();
      if (b != null)
        b.setDisplayHomeAsUpEnabled(true);
    }
  }
  
  @Override
  protected final void onCreate(Bundle savedInstanceState) {
    //top is null everytime onCreate is called, which means
    //everytime a new ActivityMain is created
    //if top == any ClientActivity other than ActivityMain when
    //onSaveInstanceState was called, then the android:viewHierarchyState
    //in the savedInstanceState Bundle will not match the actual view
    //structure that belongs to ActivityMain
    //that's why we pass null to super.onCreate!
    super.onCreate(null);
    setupActionBar();
    UI.initialize(this);
    MainHandler.initialize(getApplication());
    getWindow().setBackgroundDrawable(new ColorDrawable(UI.color_window));
    top = new ActivityMain();
    top.finished = false;
    top.activity = this;
    top.previousActivity = null;
    top.onCreate();
    top.onCreateLayout(true);
  }
  
  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.clear(); //see the comments in the method above
  }
  
  @Override
  public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    final boolean i = UI.isLandscape;
    UI.initialize(this);
    if (i != UI.isLandscape) {
      if (top != null) {
        top.onOrientationChanged();
        System.gc();
      }
    }
  }
  
  @Override
  protected void onPause() {
    if (top != null)
      top.onPause();
    super.onPause();
  }
  
  @Override
  protected void onResume() {
    super.onResume();
    if (top != null)
      top.onResume();
  }
  
  @Override
  protected void onDestroy() {
    ClientActivity c = top, p;
    top = null;
    while (c != null) {
      //the activity is already paused, so, just clean it up and destroy
      c.finished = true;
      c.onCleanupLayout();
      c.onDestroy();
      p = c.previousActivity;
      c.activity = null;
      c.previousActivity = null;
      c = p;
    }
    super.onDestroy();
    if (exitOnDestroy)
      System.exit(0);
  }
}

Java Source Code List

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