我的方法:
类来管理从/到服务/活动的发送和接收消息:
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
public class MessageManager {
public interface IOnHandleMessage{
// Messages
int MSG_HANDSHAKE = 0x1;
void onHandleMessage(Message msg);
}
private static final String LOGCAT = MessageManager.class.getSimpleName();
private Messenger mMsgSender;
private Messenger mMsgReceiver;
private List<Message> mMessages;
public MessageManager(IOnHandleMessage callback, IBinder target){
mMsgReceiver = new Messenger(new MessageHandler(callback, MessageHandler.TYPE_ACTIVITY));
mMsgSender = new Messenger(target);
mMessages = new ArrayList<>();
}
public MessageManager(IOnHandleMessage callback){
mMsgReceiver = new Messenger(new MessageHandler(callback, MessageHandler.TYPE_SERVICE));
mMsgSender = null;
mMessages = new ArrayList<>();
}
/* START Getter & Setter Methods */
public Messenger getMsgSender() {
return mMsgSender;
}
public void setMsgSender(Messenger sender) {
this.mMsgSender = sender;
}
public Messenger getMsgReceiver() {
return mMsgReceiver;
}
public void setMsgReceiver(Messenger receiver) {
this.mMsgReceiver = receiver;
}
public List<Message> getLastMessages() {
return mMessages;
}
public void addMessage(Message message) {
this.mMessages.add(message);
}
/* END Getter & Setter Methods */
/* START Public Methods */
public void sendMessage(int what, int arg1, int arg2, Bundle msgData){
if(mMsgSender != null && mMsgReceiver != null) {
try {
Message msg = Message.obtain(null, what, arg1, arg2);
msg.replyTo = mMsgReceiver;
if(msgData != null){
msg.setData(msgData);
}
mMsgSender.send(msg);
} catch (RemoteException rE) {
onException(rE);
}
}
}
public void sendHandshake(){
if(mMsgSender != null && mMsgReceiver != null){
sendMessage(IOnHandleMessage.MSG_HANDSHAKE, 0, 0, null);
}
}
/* END Public Methods */
/* START Private Methods */
private void onException(Exception e){
Log.e(LOGCAT, e.getMessage());
e.printStackTrace();
}
/* END Private Methods */
/** START Private Classes **/
private class MessageHandler extends Handler {
// Types
final static int TYPE_SERVICE = 0x1;
final static int TYPE_ACTIVITY = 0x2;
private IOnHandleMessage mCallback;
private int mType;
public MessageHandler(IOnHandleMessage callback, int type){
mCallback = callback;
mType = type;
}
@Override
public void handleMessage(Message msg){
addMessage(msg);
switch(msg.what){
case IOnHandleMessage.MSG_HANDSHAKE:
switch(mType){
case TYPE_SERVICE:
setMsgSender(msg.replyTo);
sendHandshake();
break;
case TYPE_ACTIVITY:
Log.v(LOGCAT, "HERE");
break;
}
break;
default:
if(mCallback != null){
mCallback.onHandleMessage(msg);
}
break;
}
}
}
/** END Private Classes **/
}
在活动示例中:
public class activity extends AppCompatActivity
implements ServiceConnection,
MessageManager.IOnHandleMessage {
[....]
private MessageManager mMessenger;
private void initMyMessenger(IBinder iBinder){
mMessenger = new MessageManager(this, iBinder);
mMessenger.sendHandshake();
}
private void bindToService(){
Intent intent = new Intent(this, TagScanService.class);
bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);
/* START THE SERVICE IF NEEDED */
}
private void unbindToService(){
/* UNBIND when you want (onDestroy, after operation...)
if(mBound) {
unbindService(mServiceConnection);
mBound = false;
}
}
/* START Override MessageManager.IOnHandleMessage Methods */
@Override
public void onHandleMessage(Message msg) {
switch(msg.what){
case Constants.MSG_SYNC_PROGRESS:
Bundle data = msg.getData();
String text = data.getString(Constants.KEY_MSG_TEXT);
setMessageProgress(text);
break;
case Constants.MSG_START_SYNC:
onStartSync();
break;
case Constants.MSG_END_SYNC:
onEndSync(msg.arg1 == Constants.ARG1_SUCCESS);
mBound = false;
break;
}
}
/* END Override MessageManager.IOnHandleMessage Methods */
/** START Override ServiceConnection Methods **/
private class BLEScanServiceConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
initMyMessenger(iBinder);
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
mMessenger = null;
mBound = false;
}
}
/** END Override ServiceConnection Methods **/
业务举例:
public class Blablabla extends Service
implements MessageManager.IOnHandleMessage {
[...]
private MessageManager mMessenger;
@Nullable
@Override
public IBinder onBind(Intent intent) {
super.onBind(intent);
initMessageManager();
return mMessenger.getMsgReceiver().getBinder();
}
private void initMessageManager(){
mMessenger = new MessageManager(this);
}
/* START Override IOnHandleMessage Methods */
@Override
public void onHandleMessage(Message msg) {
/* Do what you want when u get a message looking the "what" attribute */
}
/* END Override IOnHandleMessage Methods */
从活动/服务发送消息:
mMessenger.sendMessage(what, arg1, arg2, dataBundle);
这是如何工作的:
on the activity you start or bind the service.
The service "OnBind" methods return the Binder to his MessageManager, the in the Activity through the "Service Connection" interface methods implementation "OnServiceConnected" you get this IBinder and init you MessageManager using it.
After the Activity has init his MessageManager the MessageHandler send and Handshake to the service so it can set his "MessageHandler" sender ( the "private Messenger mMsgSender;" in MessageManager ). Doing this the service know to who send his messages.
你也可以在MessageManager中使用信使的列表/队列“发送者”来实现这一点，这样你就可以向不同的活动/服务发送多个消息，或者你可以在MessageManager中使用信使的列表/队列“接收者”，这样你就可以从不同的活动/服务接收多个消息。
在“MessageManager”实例中，您有一个接收到的所有消息的列表。
正如你所看到的，使用这个“MessageManager”实例的“Activity’s Messenger”和“Service Messenger”之间的连接是自动的，它是通过“onserviceconnconnected”方法和“Handshake”的使用完成的。
希望这对你有帮助:)非常感谢!
再见:D
