前面两章已经了解了大部分功能，不过还有一些东西没有讲到，接下来咱们就继续将剩下的部分讲完。
@Override
protected void onDestroy() {
super.onDestroy();
activityInstance = null;
EMGroupManager.getInstance().removeGroupChangeListener(groupListener);
}
/**
* 监测群组解散或者被T事件
*
*/
class GroupListener extends GroupReomveListener {
@Override
public void onUserRemoved(final String groupId, String groupName) {
runOnUiThread(new Runnable() {
String st13 = getResources().getString(R.string.you_are_group);
public void run() {
if (toChatUsername.equals(groupId)) {
Toast.makeText(ChatActivity.this, st13, 1).show();
if (GroupDetailsActivity.instance != null)
GroupDetailsActivity.instance.finish();
finish();
}
}
});
}
@Override
public void onGroupDestroy(final String groupId, String groupName) {
// 群组解散正好在此页面，提示群组被解散，并finish此页面
runOnUiThread(new Runnable() {
String st14 = getResources().getString(R.string.the_current_group);
public void run() {
if (toChatUsername.equals(groupId)) {
Toast.makeText(ChatActivity.this, st14, 1).show();
if (GroupDetailsActivity.instance != null)
GroupDetailsActivity.instance.finish();
finish();
}
}
});
}
}声明一个类，继承GroupReomveListener类。其中有实现两个方法，一个是用户移出，一个是群组销毁。用户移除的时候结束群组界面，当群组解散的时候，如果正处于群组界面，提示一下然后结束群组界面。跳出当前界面。
@Override
protected void onResume() {
Log.i("ChatActivity", "onResume");
super.onResume();
if (group != null)
((TextView) findViewById(R.id.name)).setText(group.getGroupName());
adapter.refresh();
DemoHXSDKHelper sdkHelper = (DemoHXSDKHelper) DemoHXSDKHelper.getInstance();
sdkHelper.pushActivity(this);
// register the event listener when enter the foreground
EMChatManager.getInstance().registerEventListener(this, new EMNotifierEvent.Event[] { EMNotifierEvent.Event.EventNewMessage, EMNotifierEvent.Event.EventDeliveryAck, EMNotifierEvent.Event.EventReadAck });
}
@Override
protected void onStop() {
Log.i("ChatActivity", "onStop");
// unregister this event listener when this activity enters the
// background
EMChatManager.getInstance().unregisterEventListener(this);
DemoHXSDKHelper sdkHelper = (DemoHXSDKHelper) DemoHXSDKHelper.getInstance();
// 把此activity 从foreground activity 列表里移除
sdkHelper.popActivity(this);
super.onStop();
}
@Override
protected void onPause() {
super.onPause();
if (wakeLock.isHeld())
wakeLock.release();
if (VoicePlayClickListener.isPlaying && VoicePlayClickListener.currentPlayListener != null) {
// 停止语音播放
VoicePlayClickListener.currentPlayListener.stopPlayVoice();
}
try {
// 停止录音
if (voiceRecorder.isRecording()) {
voiceRecorder.discardRecording();
recordingContainer.setVisibility(View.INVISIBLE);
}
} catch (Exception e) {
}
}
/**
* 隐藏软键盘
*/
private void hideKeyboard() {
if (getWindow().getAttributes().softInputMode != WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN) {
if (getCurrentFocus() != null)
manager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}
}/**
* 加入到黑名单
*
* @param username
*/
private void addUserToBlacklist(final String username) {
final ProgressDialog pd = new ProgressDialog(this);
pd.setMessage(getString(R.string.Is_moved_into_blacklist));
pd.setCanceledOnTouchOutside(false);
pd.show();
new Thread(new Runnable() {
public void run() {
try {
EMContactManager.getInstance().addUserToBlackList(username, false);
runOnUiThread(new Runnable() {
public void run() {
pd.dismiss();
Toast.makeText(getApplicationContext(), R.string.Move_into_blacklist_success, 0).show();
}
});
} catch (EaseMobException e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
pd.dismiss();
Toast.makeText(getApplicationContext(), R.string.Move_into_blacklist_failure, 0).show();
}
});
}
}
}).start();
}
/**
* 覆盖手机返回键
*/
@Override
public void onBackPressed() {
if (more.getVisibility() == View.VISIBLE) {
more.setVisibility(View.GONE);
iv_emoticons_normal.setVisibility(View.VISIBLE);
iv_emoticons_checked.setVisibility(View.INVISIBLE);
} else {
super.onBackPressed();
}
}
/**
* listview滑动监听listener
*
*/
private class ListScrollListener implements OnScrollListener {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case OnScrollListener.SCROLL_STATE_IDLE:
//当第一项显示在屏幕上，并且没有再继续加载
if (view.getFirstVisiblePosition() == 0 && !isloading && haveMoreData) {
isloading = true;
loadmorePB.setVisibility(View.VISIBLE);
// sdk初始化加载的聊天记录为20条，到顶时去db里获取更多
List<EMMessage> messages;
EMMessage firstMsg = conversation.getAllMessages().get(0);
try {
// 获取更多messges，调用此方法的时候从db获取的messages
// sdk会自动存入到此conversation中
if (chatType == CHATTYPE_SINGLE)
messages = conversation.loadMoreMsgFromDB(firstMsg.getMsgId(), pagesize);
else
messages = conversation.loadMoreGroupMsgFromDB(firstMsg.getMsgId(), pagesize);
} catch (Exception e1) {
loadmorePB.setVisibility(View.GONE);
return;
}
try {
Thread.sleep(300);
} catch (InterruptedException e) {
}
if (messages.size() != 0) {
// 刷新ui
if (messages.size() > 0) {
adapter.refreshSeekTo(messages.size() - 1);
}
if (messages.size() != pagesize)
haveMoreData = false;
} else {
haveMoreData = false;
}
loadmorePB.setVisibility(View.GONE);
isloading = false;
}
break;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
} @Override
protected void onNewIntent(Intent intent) {
// 点击notification bar进入聊天页面，保证只有一个聊天页面
String username = intent.getStringExtra("userId");
if (toChatUsername.equals(username))
super.onNewIntent(intent);
else {
finish();
startActivity(intent);
}
}最后，还有一个聊天界面的UI模式，通过ListView来显示消息，由于内容比较多。所以下一章再将啦。
原文地址：http://blog.csdn.net/caowei0403/article/details/45362915
