Android端“被挤下线”功能的单点登录实现

// 注册连接监听
EMChatManager.getInstance().addConnectionListener(connectionListener);

// create the global connection listener
connectionListener = new EMConnectionListener() {
  @Override
  public void onDisconnected(int error) {
    if (error == EMError.USER_REMOVED) {
      onCurrentAccountRemoved();
    } else if (error == EMError.CONNECTION_CONFLICT) {
      onConnectionConflict();
    }
  }

  @Override
  public void onConnected() {
    // in case group and contact were already synced, we supposed to
    // notify sdk we are ready to receive the events
  }
};

/**
* 账号在别的设备登录
*/
protected void onConnectionConflict() {
  Intent intent = new Intent(appContext, MainActivity.class);
  intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  intent.putExtra(Constant.ACCOUNT_CONFLICT, true);
  appContext.startActivity(intent);
}

@Override
protected void onNewIntent(Intent intent) {
  super.onNewIntent(intent);
  if (intent.getBooleanExtra(Constant.ACCOUNT_CONFLICT, false) && !isConflictDialogShow) {
    showConflictDialog();
  } else if (intent.getBooleanExtra(Constant.ACCOUNT_REMOVED, false)
      && !isAccountRemovedDialogShow) {
    showAccountRemovedDialog();
  }
}