Android 基于环信即时云的IM开发

假如我们想要快速实现一个即时通讯功能，最快捷的方法就是借助网络上的即时云服务。下面我们讲述一下如何利用环信实现一个IM功能。

首先下载环信的SDK，也就是几个库，把demo里面的HXSDKHelper.java，HXSDKModel.java,DefaultHXSDKModel.java，HXPreferenceUtils.java四个文件复制到新建的工程下。稍作修改。

首先在Application中实现初始化SDK

public static DemoHXSDKHelper hxSDKHelper = new DemoHXSDKHelper();() {super.onCreate();applicationContext = this;instance = this;hxSDKHelper.onInit(applicationContext);}

然后在Activity中登陆

EMChatManager.getInstance().login(“123456”, “123456”, new EMCallBack() {() {runOnUiThread(new Runnable() {() {// TODO Auto-generated method stubToast.makeText(context, “登陆成功！”, Toast.LENGTH_LONG).show();}});};(int progress, String status) {}(final int code, final String message) {runOnUiThread(new Runnable() {() {Toast.makeText(getApplicationContext(), “登陆失败” + message, Toast.LENGTH_SHORT).show();}});}});

调用函数进行信息的发送

String string = editText3.getText().toString();EMMessage message = EMMessage.createSendMessage(EMMessage.Type.TXT);String toNum = editText.getText().toString();if (toNum.equals(“1425193776689”)) {message.setChatType(ChatType.GroupChat);}TextMessageBody txtBody = new TextMessageBody(string);message.addBody(txtBody);message.setReceipt(toNum);try {EMChatManager.getInstance().sendMessage(message);} catch (EaseMobException e) {// TODO Auto-generated catch blocke.printStackTrace();}

在接收信息时，只需要监听广播就可以

// 注册接收消息广播receiver = new NewMessageBroadcastReceiver();IntentFilter intentFilter = new IntentFilter(EMChatManager.getInstance().getNewMessageBroadcastAction());intentFilter.setPriority(5);registerReceiver(receiver, intentFilter); {(Context context, Intent intent) {// 记得把广播给终结掉abortBroadcast();String username = intent.getStringExtra(“from”);String msgId = intent.getStringExtra(“msgid”);// 收到这个广播的时候，message已经在db和内存里了，，可以通过id获取mesage对象final EMMessage message = EMChatManager.getInstance().getMessage(msgId);final TextMessageBody txtBody = (TextMessageBody)message.getBody();Toast.makeText(getApplicationContext(), “text message from:” + message.getFrom() + ” text:” + txtBody.getMessage() + ” \n\r”, Toast.LENGTH_LONG).show();runOnUiThread(new Runnable() {() {editText2.setText(“from:” + message.getFrom() + “\ntext:” + txtBody.getMessage() + ” \n”);}});}}

这样就可以进行收发。 由于环信的库比较大，编译完之后可执行文件有5M那么大。

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