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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.android.tools.sdkcontroller.activities;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.util.Log;
import com.android.tools.sdkcontroller.service.ControllerService;
import com.android.tools.sdkcontroller.service.ControllerService.ControllerBinder;
import com.android.tools.sdkcontroller.service.ControllerService.ControllerListener;
/**
* Base activity class that knows how to bind and unbind from the
* {@link ControllerService}.
*/
public abstract class BaseBindingActivity extends Activity {
public static String TAG = BaseBindingActivity.class.getSimpleName();
private static boolean DEBUG = true;
private ServiceConnection mServiceConnection;
private ControllerBinder mServiceBinder;
/**
* Returns the binder. Activities can use that to query the controller service.
* @return An existing {@link ControllerBinder}.
* The binder is only valid between calls {@link #onServiceConnected()} and
* {@link #onServiceDisconnected()}. Returns null when not valid.
*/
public ControllerBinder getServiceBinder() {
return mServiceBinder;
}
/**
* Called when the activity resumes.
* This automatically binds to the service, starting it as needed.
* <p/>
* Since on resume we automatically bind to the service, the {@link ServiceConnection}
* will is restored and {@link #onServiceConnected()} is called as necessary.
* Derived classes that need to initialize anything that is related to the service
* (e.g. getting their handler) should thus do so in {@link #onServiceConnected()} and
* <em>not</em> in {@link #onResume()} -- since binding to the service is asynchronous
* there is <em>no</em> guarantee that {@link #getServiceBinder()} returns non-null
* when this call finishes.
*/
@Override
protected void onResume() {
super.onResume();
bindToService();
}
/**
* Called when the activity is paused.
* This automatically unbinds from the service but does not stop it.
*/
@Override
protected void onPause() {
super.onPause();
unbindFromService();
}
// ----------
/**
* Called when binding to the service to get the activity's {@link ControllerListener}.
* @return A new non-null {@link ControllerListener}.
*/
protected abstract ControllerListener createControllerListener();
/**
* Called by the service once the activity is connected (bound) to it.
* <p/>
* When this is called, {@link #getServiceBinder()} returns a non-null binder that
* can be used by the activity to control the service.
*/
protected abstract void onServiceConnected();
/**
* Called by the service when it is forcibly disconnected OR when we know
* we're unbinding the service.
* <p/>
* When this is called, {@link #getServiceBinder()} returns a null binder and
* the activity should stop using that binder and remove any reference to it.
*/
protected abstract void onServiceDisconnected();
/**
* Starts the service and binds to it.
*/
protected void bindToService() {
if (mServiceConnection == null) {
final ControllerListener listener = createControllerListener();
mServiceConnection = new ServiceConnection() {
/**
* Called when the service is connected.
* Allows us to retrieve the binder to talk to the service.
*/
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
if (DEBUG) Log.d(TAG, "Activity connected to service");
mServiceBinder = (ControllerBinder) service;
mServiceBinder.addControllerListener(listener);
BaseBindingActivity.this.onServiceConnected();
}
/**
* Called when the service got disconnected, e.g. because it crashed.
* This is <em>not</em> called when we unbind from the service.
*/
@Override
public void onServiceDisconnected(ComponentName name) {
if (DEBUG) Log.d(TAG, "Activity disconnected from service");
mServiceBinder = null;
BaseBindingActivity.this.onServiceDisconnected();
}
};
}
// Start service so that it doesn't stop when we unbind
if (DEBUG) Log.d(TAG, "start requested & bind service");
Intent service = new Intent(this, ControllerService.class);
startService(service);
bindService(service,
mServiceConnection,
Context.BIND_AUTO_CREATE);
}
/**
* Unbinds from the service but does not actually stop the service.
* This lets us have it run in the background even if this isn't the active activity.
*/
protected void unbindFromService() {
if (mServiceConnection != null) {
if (DEBUG) Log.d(TAG, "unbind service");
mServiceConnection.onServiceDisconnected(null /*name*/);
unbindService(mServiceConnection);
mServiceConnection = null;
}
}
}
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