1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.apis.app;
18
19import com.example.android.apis.R;
20
21import android.app.Activity;
22import android.content.ComponentName;
23import android.content.Context;
24import android.content.Intent;
25import android.content.ServiceConnection;
26import android.os.Bundle;
27import android.os.IBinder;
28import android.view.View;
29import android.view.View.OnClickListener;
30import android.widget.Button;
31import android.widget.Toast;
32
33public class LocalServiceActivities {
34    /**
35     * <p>Example of explicitly starting and stopping the local service.
36     * This demonstrates the implementation of a service that runs in the same
37     * process as the rest of the application, which is explicitly started and stopped
38     * as desired.</p>
39     *
40     * <p>Note that this is implemented as an inner class only keep the sample
41     * all together; typically this code would appear in some separate class.
42     */
43    public static class Controller extends Activity {
44        @Override
45        protected void onCreate(Bundle savedInstanceState) {
46            super.onCreate(savedInstanceState);
47
48            setContentView(R.layout.local_service_controller);
49
50            // Watch for button clicks.
51            Button button = (Button)findViewById(R.id.start);
52            button.setOnClickListener(mStartListener);
53            button = (Button)findViewById(R.id.stop);
54            button.setOnClickListener(mStopListener);
55        }
56
57        private OnClickListener mStartListener = new OnClickListener() {
58            public void onClick(View v) {
59                // Make sure the service is started.  It will continue running
60                // until someone calls stopService().  The Intent we use to find
61                // the service explicitly specifies our service component, because
62                // we want it running in our own process and don't want other
63                // applications to replace it.
64                startService(new Intent(Controller.this,
65                        LocalService.class));
66            }
67        };
68
69        private OnClickListener mStopListener = new OnClickListener() {
70            public void onClick(View v) {
71                // Cancel a previous call to startService().  Note that the
72                // service will not actually stop at this point if there are
73                // still bound clients.
74                stopService(new Intent(Controller.this,
75                        LocalService.class));
76            }
77        };
78    }
79
80    // ----------------------------------------------------------------------
81
82    /**
83     * Example of binding and unbinding to the local service.
84     * This demonstrates the implementation of a service which the client will
85     * bind to, receiving an object through which it can communicate with the service.</p>
86     *
87     * <p>Note that this is implemented as an inner class only keep the sample
88     * all together; typically this code would appear in some separate class.
89     */
90    public static class Binding extends Activity {
91        private boolean mIsBound;
92
93// BEGIN_INCLUDE(bind)
94        private LocalService mBoundService;
95
96        private ServiceConnection mConnection = new ServiceConnection() {
97            public void onServiceConnected(ComponentName className, IBinder service) {
98                // This is called when the connection with the service has been
99                // established, giving us the service object we can use to
100                // interact with the service.  Because we have bound to a explicit
101                // service that we know is running in our own process, we can
102                // cast its IBinder to a concrete class and directly access it.
103                mBoundService = ((LocalService.LocalBinder)service).getService();
104
105                // Tell the user about this for our demo.
106                Toast.makeText(Binding.this, R.string.local_service_connected,
107                        Toast.LENGTH_SHORT).show();
108            }
109
110            public void onServiceDisconnected(ComponentName className) {
111                // This is called when the connection with the service has been
112                // unexpectedly disconnected -- that is, its process crashed.
113                // Because it is running in our same process, we should never
114                // see this happen.
115                mBoundService = null;
116                Toast.makeText(Binding.this, R.string.local_service_disconnected,
117                        Toast.LENGTH_SHORT).show();
118            }
119        };
120
121        void doBindService() {
122            // Establish a connection with the service.  We use an explicit
123            // class name because we want a specific service implementation that
124            // we know will be running in our own process (and thus won't be
125            // supporting component replacement by other applications).
126            bindService(new Intent(Binding.this,
127                    LocalService.class), mConnection, Context.BIND_AUTO_CREATE);
128            mIsBound = true;
129        }
130
131        void doUnbindService() {
132            if (mIsBound) {
133                // Detach our existing connection.
134                unbindService(mConnection);
135                mIsBound = false;
136            }
137        }
138
139        @Override
140        protected void onDestroy() {
141            super.onDestroy();
142            doUnbindService();
143        }
144// END_INCLUDE(bind)
145
146        private OnClickListener mBindListener = new OnClickListener() {
147            public void onClick(View v) {
148                doBindService();
149            }
150        };
151
152        private OnClickListener mUnbindListener = new OnClickListener() {
153            public void onClick(View v) {
154                doUnbindService();
155            }
156        };
157
158        @Override
159        protected void onCreate(Bundle savedInstanceState) {
160            super.onCreate(savedInstanceState);
161
162            setContentView(R.layout.local_service_binding);
163
164            // Watch for button clicks.
165            Button button = (Button)findViewById(R.id.bind);
166            button.setOnClickListener(mBindListener);
167            button = (Button)findViewById(R.id.unbind);
168            button.setOnClickListener(mUnbindListener);
169        }
170    }
171}
172