ARactivity.java

package org.mixare;

import java.util.List;

import org.mixare.plugin.PluginType;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.widget.CheckBox;

/**
 * This is the main activity of mixare, that will be opened if mixare is
 * launched through the android.intent.action.MAIN the main tasks of this
 * activity is showing a prompt dialog where the user can decide to launch the
 * plugins, or not to launch the plugins. This class is also able to remember
 * those decisions, so that it can forward directly to the next activity.
 * 
 * @author A.Egal
 */
public class ARactivity extends Activity {

	private Context ctx;
	private final String usePluginsPrefs = "mixareUsePluginsPrefs";
	private final String usePluginsKey = "usePlugins";
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		ctx = this;
		if(arePluginsAvailable() && isDecisionRemembered()){
			showDialog();
		}else{
			if(getRememberedDecision()){ 		//yes button
				startActivity(new Intent(ctx, PluginLoaderActivity.class));
				finish();
			} else{								//no button
				startActivity(new Intent(ctx, MixView.class));
				finish();
			}
		}
	}	

	/**
	 * Shows a dialog
	 */
	public void showDialog() {
		final AlertDialog.Builder dialog = new AlertDialog.Builder(this);

		dialog.setTitle(R.string.launch_plugins);
		dialog.setMessage(R.string.plugin_message);

		final CheckBox checkBox = new CheckBox(ctx);
		checkBox.setText(R.string.remember_this_decision);
		dialog.setView(checkBox);		
		
		dialog.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
			public void onClick(DialogInterface d, int whichButton) {
				processCheckbox(true, checkBox);
				startActivity(new Intent(ctx, PluginLoaderActivity.class));
				finish();
			}
		});

		dialog.setNegativeButton(R.string.no,new DialogInterface.OnClickListener() {
			public void onClick(DialogInterface d, int whichButton) {
				processCheckbox(true, checkBox);
				startActivity(new Intent(ctx, MixView.class));
				finish();
			}
		});

		dialog.show();
	}
	
	private boolean isDecisionRemembered(){
		SharedPreferences sharedPreferences = getSharedPreferences(usePluginsPrefs, MODE_PRIVATE);
		return ! sharedPreferences.contains(usePluginsKey);
	}
	
	private boolean arePluginsAvailable(){
		PluginType[] allPluginTypes = PluginType.values();
		for(PluginType pluginType : allPluginTypes){
			PackageManager packageManager = getPackageManager();
			Intent baseIntent = new Intent(pluginType.getActionName());
			List<ResolveInfo> list = packageManager.queryIntentServices(baseIntent,
					PackageManager.GET_RESOLVED_FILTER);
			
			if(list.size() > 0){
				return true;
			}
		}
		return false;
	}
	
	private void processCheckbox(boolean loadplugin, CheckBox checkBox){
		if(checkBox.isChecked()){
			SharedPreferences sharedPreferences = getSharedPreferences(usePluginsPrefs, MODE_PRIVATE);
			Editor editor = sharedPreferences.edit();
			editor.putBoolean(usePluginsKey, loadplugin);
			editor.commit();
		}
	}
	
	private boolean getRememberedDecision(){
		SharedPreferences sharedPreferences = getSharedPreferences(usePluginsPrefs, MODE_PRIVATE);
		return sharedPreferences.getBoolean(usePluginsKey, false);
	}

}