Android總結篇系列：Android Service

阿新 • • 發佈：2018-12-30

1 public class CActivity extends Activity { 2 3 public static final String TAG = "CActivity"; 4 5 private Button bindServiceBtn; 6 private Button unbindServiceBtn; 7 private Button sendMsgToServerBtn; 8 9 private ServiceConnection sc = new MyServiceConnection();

10 private boolean mBound; 11 12 private Messenger mServerMessenger; 13 14 private Handler mClientHandler = new MyClientHandler(); 15 private Messenger mClientMessenger = new Messenger(mClientHandler); 16 17 private class MyClientHandler extends Handler { 18 @Override

19 public void handleMessage(Message msg) { 20 if (msg.what == MyMessengerService.MSG_FROM_SERVER_TO_CLIENT) { 21 Log.w(TAG, "reveive msg from server"); 22 } 23 } 24 } 25 26 private class MyServiceConnection implements ServiceConnection {

27 28 @Override 29 public void onServiceConnected(ComponentName name, IBinder binder) { 30 Log.w(TAG, "in MyServiceConnection onServiceConnected"); 31 mServerMessenger = new Messenger(binder); 32 33 mBound = true; 34 } 35 36 @Override 37 public void onServiceDisconnected(ComponentName name) { 38 // This is called when the connection with the service has been 39 // unexpectedly disconnected -- that is, its process crashed. 40 Log.w(TAG, "in MyServiceConnection onServiceDisconnected"); 41 42 mBound = false; 43 } 44 } 45 46 @Override 47 protected void onCreate(Bundle savedInstanceState) { 48 super.onCreate(savedInstanceState); 49 setContentView(R.layout.c); 50 51 bindServiceBtn = (Button) findViewById(R.id.bind_service); 52 unbindServiceBtn = (Button) findViewById(R.id.unbind_service); 53 sendMsgToServerBtn = (Button) findViewById(R.id.send_msg_to_server); 54 55 bindServiceBtn.setOnClickListener(new View.OnClickListener() { 56 @Override 57 public void onClick(View v) { 58 Intent intent = new Intent(CActivity.this, MyMessengerService.class); 59 bindService(intent, sc, Context.BIND_AUTO_CREATE); 60 } 61 }); 62 63 unbindServiceBtn.setOnClickListener(new View.OnClickListener() { 64 @Override 65 public void onClick(View v) { 66 excuteUnbindService(); 67 } 68 }); 69 70 sendMsgToServerBtn.setOnClickListener(new View.OnClickListener() { 71 @Override 72 public void onClick(View v) { 73 sayHello(); 74 } 75 }); 76 77 new Handler().postDelayed(new Runnable() { 78 @Override 79 public void run() { 80 Intent intent = new Intent(CActivity.this, MyAlarmBroadcastReceiver.class); 81 sendBroadcast(intent); 82 } 83 }, 3 * 1000); 84 85 } 86 87 public void sayHello() { 88 if (!mBound) 89 return; 90 // Create and send a message to the service, using a supported 'what' value 91 Message msg = Message.obtain(null, MyMessengerService.MSG_FROM_CLIENT_TO_SERVER, 0, 0); 92 // 通過replyTo把client端的Messenger(信使)傳遞給service 93 msg.replyTo = mClientMessenger; 94 try { 95 mServerMessenger.send(msg); 96 } catch (RemoteException e) { 97 e.printStackTrace(); 98 } 99 } 100 101 private void excuteUnbindService() { 102 if (mBound) { 103 unbindService(sc); 104 mBound = false; 105 } 106 } 107 108 @Override 109 protected void onDestroy() { 110 super.onDestroy(); 111 Log.w(TAG, "in onDestroy"); 112 excuteUnbindService(); 113 } 114 }

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