DynamicShareActionProvider.java

/**
 * Copyright 2013 Niklas Wenzel
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 com.cusnews.widgets;

import java.util.List;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.support.v4.view.ActionProvider;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.widget.Toast;

import com.cusnews.R;


public class DynamicShareActionProvider extends ActionProvider {

	private PackageManager    pm;
	private List<ResolveInfo> list;
	private Context           context;
	private Intent            shareIntent;

	private Object listener = null;

	public DynamicShareActionProvider( Context context ) {
		super( context );
		this.context = context;
	}


	public void setShareDataType( String type ) {
		if( pm == null ) {
			pm = context.getPackageManager();
		}
		shareIntent = new Intent( Intent.ACTION_SEND );
		shareIntent.setType( type );
		list = pm.queryIntentActivities( shareIntent, 0 );
	}


	public void setOnShareIntentUpdateListener( OnShareIntentUpdateListener listener ) {
		if( listener != null ) {
			this.listener = listener;
		} else {
			throw new NullPointerException( "listener must not be null!" );
		}
	}


	public void setOnShareLaterListener( OnShareLaterListener listener ) {
		if( listener != null ) {
			this.listener = listener;
		} else {
			throw new NullPointerException( "listener must not be null!" );
		}
	}

	@Override
	public View onCreateActionView() {
		return null;
	}

	@Override
	public boolean hasSubMenu() {
		return true;
	}

	@Override
	public void onPrepareSubMenu( SubMenu subMenu ) {
		subMenu.clear();
		if( pm != null && list != null && list.size() > 0 ) {
			for( int i = 0; i < list.size(); i++ ) {
				ResolveInfo                         resolveInfo  = list.get( i );
				OnMenuItemClickUpdateIntentListener itemListener = new OnMenuItemClickUpdateIntentListener();
				itemListener.setPosition( i );
				subMenu.add( resolveInfo.loadLabel( pm ) )
					   .setIcon( resolveInfo.loadIcon( pm ) )
					   .setOnMenuItemClickListener(itemListener );
			}
		} else {
			String msg;
			if( shareIntent == null || shareIntent.getType() == null || shareIntent.getType().equals( "" ) ) {
				msg = context.getString( R.string.no_share_type );
			} else if( list == null || list.size() <= 0 ) {
				String formatMsg = context.getString( R.string.no_app_to_share );
				msg = String.format( formatMsg, shareIntent.getType() );
			} else {
				msg = context.getString( R.string.error_occurred );
			}

			Toast.makeText( context, msg, Toast.LENGTH_LONG ).show();
		}
	}

	public class OnMenuItemClickUpdateIntentListener implements MenuItem.OnMenuItemClickListener {

		private int position;

		@Override
		public boolean onMenuItemClick( MenuItem item ) {
			if( listener == null ) {
				return false;
			} else {
				ActivityInfo activity = list.get( position ).activityInfo;
				ComponentName name = new ComponentName( activity.applicationInfo.packageName, activity.name );
				shareIntent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED );
				shareIntent.setComponent( name );

				if( listener instanceof OnShareIntentUpdateListener ) {
					OnShareIntentUpdateListener onShareIntentUpdateListener = (OnShareIntentUpdateListener) listener;
					shareIntent.putExtras( onShareIntentUpdateListener.onShareIntentExtrasUpdate() );

					context.startActivity( shareIntent );

					return true;
				} else if( listener instanceof OnShareLaterListener ) {
					OnShareLaterListener onShareLaterListener = (OnShareLaterListener) listener;
					onShareLaterListener.onShareClick( shareIntent );

					return true;
				}

				return false;
			}
		}

		protected void setPosition( int position ) {
			this.position = position;
		}

	}

	public interface OnShareIntentUpdateListener {

		/**
		 * This will be called when an app for sharing has been selected. Generate the data here.
		 * @return The data which should be shared as you would pass it to the Intent using {@link Intent#putExtras(Bundle)}.
		 */
		public Bundle onShareIntentExtrasUpdate();

	}

	public interface OnShareLaterListener {

		/**
		 * This will be called when an app for sharing has been selected. Implement your custom sharing implementation here.
		 * @param shareIntent The {@link Intent} containing the necessary information about the receiver and the data type
		 */
		public void onShareClick( Intent shareIntent );

	}

}