IPC-进程间通信（一）Messager

直奔主题！

服务端 ：这里用一个service模拟一个进程（用两个apk也行）

创建一个service（服务端） public class WolfService extends Service {} 在service内部创建一个handler private final static Handler handler = new Handler() {} 创建一个Messager，并把handler放入其中 private final static Messenger messenger = new Messenger(handler); 重写onbind方法，返回messager里的binder @Nullable @Override public IBinder onBind(Intent intent) { //返回messager里的bindler return messenger.getBinder(); } 服务端完整代码：WolfService.java public class WolfService extends Service { private static final int MSG_SUM = 0x110; private final static Handler handler = new Handler() { @Override public void handleMessage(Message msgfromClient) { Message msgToClient = Message.obtain(msgfromClient);//返回给客户端的消息 switch (msgfromClient.what) { //msg 客户端传来的消息 case MSG_SUM: msgToClient.what = MSG_SUM; try { //模拟耗时 Thread.sleep(2000); msgToClient.arg2 = msgfromClient.arg1 + msgfromClient.arg2; //replyTo是关键代码（把消息返还给客户端） msgfromClient.replyTo.send(msgToClient); } catch (Exception e) { e.printStackTrace(); } break; } super.handleMessage(msgfromClient); } }; /** * 把handler传入Messager中 */ private final static Messenger messenger = new Messenger(handler); @Nullable @Override public IBinder onBind(Intent intent) { //返回messager里的bindler return messenger.getBinder(); } } 清单文件中配置 <service android:name="wolf.ipc_messager.server.WolfService" android:process=":wolf6666"> <intent-filter> <action android:name="wolf.wolf"></action> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </service>

-运行程序 确认程序是否是两个进程

//清单文件配置的这个属性，就是说明这个service作为一个进程存在 android:process=":wolf6666"

客户端

第一步就是绑定服务 Intent intent= new Intent(MainActivity.this, WolfService.class); intent.setAction("wolf.wolf"); connection = new WolfServiceConnection(); bindService(intent, connection, Context.BIND_AUTO_CREATE);

注意：不要忘了在ondestroy解绑

unbindService(connection); 写一个内部类实现ServiceConnection class WolfServiceConnection implements ServiceConnection { @Override public void onServiceConnected(ComponentName name, IBinder service) { //其实在这里已经可以想服务端发送消息了 } @Override public void onServiceDisconnected(ComponentName name) { }}

到这一步其实已经可以想服务端发送消息实现通信了，但这样只是单向通信，我们需要的是双向通信，所以在客户端也需要一个handler和messager

创建handler和messager，并把handler放入messager private Messenger mMessenger = new Messenger(new Handler() { @Override public void handleMessage(Message msgFromServer) { super.handleMessage(msgFromServer); } }); 客户端完整代码：Mainactivity.java public class MainActivity extends AppCompatActivity { private Button btn1; private WolfServiceConnection connection; private TextView tv; private TextView tv2; private Messenger mService; class WolfServiceConnection implements ServiceConnection { @Override public void onServiceConnected(ComponentName name, IBinder service) { mService = new Messenger(service); tv2.setText("连接成功"); } @Override public void onServiceDisconnected(ComponentName name) { mService = null; tv2.setText("disconnected!"); } } private int i; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //绑定服务 Intent intent = new Intent(MainActivity.this, WolfService.class); intent.setAction("wolf.wolf"); connection = new WolfServiceConnection(); bindService(intent, connection, Context.BIND_AUTO_CREATE); btn1 = (Button) findViewById(R.id.button); tv = (TextView) findViewById(R.id.textView); tv2 = (TextView) findViewById(R.id.textView2); btn1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //这里再点击事件中发送消息 int a = i++; int b = (int) (Math.random() * 100); tv.setText(" messager: "+a + " + " + b + " ="); try { Message msgFromClient = Message.obtain(null, MSG_SUM,a,b); msgFromClient.replyTo = mMessenger; mService.send(msgFromClient); } catch (Exception e) { e.printStackTrace(); } } }); } private static final int MSG_SUM = 0x110; private Messenger mMessenger = new Messenger(new Handler() { @Override public void handleMessage(Message msgFromServer) { switch (msgFromServer.what) { case MSG_SUM: tv.setText(tv.getText() + "=>" + msgFromServer.arg2); break; } super.handleMessage(msgFromServer); } }); @Override protected void onDestroy() { super.onDestroy(); unbindService(connection); } } 效果图

demo：http://download.csdn.net/detail/qq_34501274/9813323