FutureActivity.java

/*
 * Copyright (C) 2010 Google Inc.
 *
 * 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 com.googlecode.android_scripting.activity;

import android.app.Activity;
import android.app.Service;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;

import com.googlecode.android_scripting.BaseApplication;
import com.googlecode.android_scripting.Constants;
import com.googlecode.android_scripting.FutureActivityTaskExecutor;
import com.googlecode.android_scripting.Log;
import com.googlecode.android_scripting.future.FutureActivityTask;
import com.googlecode.android_scripting.jsonrpc.RpcReceiver;

/**
 * This {@link Activity} is launched by {@link RpcReceiver}s in order to perform
 * operations that a {@link Service} is unable to do. For example: start another
 * activity for result, show dialogs, etc.
 * 
 * @author Damon Kohler (damonkohler@gmail.com)
 */
public class FutureActivity extends Activity {
	private FutureActivityTask<?> mTask;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.v("FutureActivity created.");
		int id = getIntent().getIntExtra(Constants.EXTRA_TASK_ID, 0);
		if (id == 0) {
			throw new RuntimeException(
					"FutureActivityTask ID is not specified.");
		}
		FutureActivityTaskExecutor taskQueue = ((BaseApplication) getApplication())
				.getTaskExecutor();
		mTask = taskQueue.getTask(id);
		if (mTask == null) { // TODO: (Robbie) This is now less of a kludge.
								// Would still like to know
								// what is happening.
			Log.w("FutureActivity has no task!");
			try {
				Intent intent = new Intent(Intent.ACTION_MAIN); // Should
																// default to
																// main of
																// current app.
				intent.addCategory(Intent.CATEGORY_LAUNCHER);
				String packageName = getPackageName();
				for (ResolveInfo resolve : getPackageManager()
						.queryIntentActivities(intent, 0)) {
					if (resolve.activityInfo.packageName.equals(packageName)) {
						intent.setClassName(packageName,
								resolve.activityInfo.name);
						break;
					}
				}
				startActivity(intent);
			} catch (Exception e) {
				Log.e("Can't find main activity.");
			}
		} else {
			mTask.setActivity(this);
			mTask.onCreate();
		}
	}

	@Override
	protected void onStart() {
		super.onStart();
		if (mTask != null) {
			mTask.onStart();
		}
	}

	@Override
	protected void onResume() {
		super.onResume();
		if (mTask != null) {
			mTask.onResume();
		}
	}

	@Override
	protected void onPause() {
		super.onPause();
		if (mTask != null) {
			mTask.onPause();
		}
	}

	@Override
	protected void onStop() {
		super.onStop();
		if (mTask != null) {
			mTask.onStop();
		}
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		if (mTask != null) {
			mTask.onDestroy();
		}
	}

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		if (mTask != null) {
			mTask.onCreateContextMenu(menu, v, menuInfo);
		}
	}

	@Override
	public boolean onPrepareOptionsMenu(Menu menu) {
		super.onPrepareOptionsMenu(menu);
		if (mTask == null) {
			return false;
		} else {
			return mTask.onPrepareOptionsMenu(menu);
		}
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (mTask != null) {
			mTask.onActivityResult(requestCode, resultCode, data);
		}
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (mTask != null) {
			return mTask.onKeyDown(keyCode, event);
		}
		return false;
	}
}