我正在制作一个聊天应用程序，我希望私有(private)聊天能够快速，因为我正在使用自动刷新和异步任务。但是当我第一次去聊天类(class)但当我返回时它刷新得很快它再次变慢并且需要时间刷新...并且向数据库发送消息很慢。
如果我使用sqlite定期将数据保存在mysql数据库中。它会使其保存速度更快吗，因为我将从 sqlite 数据库中读取......并且仅将新数据从 mysql 加载到 sqlite
这是代码。
package com.mall.our;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.mall.first.JSONParser;
import com.mall.first.MessageCategoryList;
import com.mall.first.R;
import com.mall.our.Chat.LoadComments;
import android.app.ListActivity;
import android.app.ListFragment;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class Chatting extends ListActivity {
// fr the sending of message
private static final String TAG_POSTS = "posts";
public static final String TAG_ID = "id";
public static final String TAG_time = "time";
public static final String TAG_state = "state";
public static final String TAG_MESSAGE = "categories_message";
public static final String TAG_CATEGORIES_LOGO = "categories_logo";
public static final String TAG_from = "from ";
//end
JSONParser jsonParser = new JSONParser();
private ProgressDialog pDialog;
private static final String URL_CATEGORY = "http://www.thethinker.com.ng/ochat/selectmess.php";
private static final String url = "http://www.thethinker.com.ng/ochat/sendmessage.php";
private static final String ur = "http://www.thethinker.com.ng/ochat/seen.php";
private BaseAdapter mAdapter;
EditText mess;
private ListView lv;
ImageButton send;
private static final String TAG_SUCCESS = "success";
Intent b = getIntent();
String state;
int flag = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.yon);
mess = (EditText) findViewById(R.id.mess);
send = (ImageButton) findViewById(R.id.send);
lv = getListView();
lv.setDivider(null);
ScheduledExecutorService scheduleTaskExecutor = Executors.newScheduledThreadPool(5);
/*This schedules a runnable task every second*/
scheduleTaskExecutor.scheduleAtFixedRate(new Runnable() {
public void run()
{
runOnUiThread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
new LoadComments().execute();
}
});
}
}, 0, 5, TimeUnit.SECONDS);
ff();
sending();
}
private void sending() {
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if (!isOnline(Chatting.this)) {
Toast.makeText(Chatting.this, "No network connection",
Toast.LENGTH_LONG).show();
return;
}
new sendtext().execute();
}
private boolean isOnline(Context mContext) {
ConnectivityManager cm = (ConnectivityManager) mContext
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
});
}
public void ff(){
Bundle go = getIntent().getExtras();
String friendname = go.getString("po");
TextView name = (TextView) findViewById(R.id.user);
name.setText(friendname);
}
class LoadComments extends
AsyncTask<Void, Void, ArrayList<HashMap<String, String>>> {
private ProgressDialog pDialog;
int priorPosition= getListView().getFirstVisiblePosition();
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Chatting.this);
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
}
@Override
protected ArrayList<HashMap<String, String>> doInBackground(
Void... arg0) {
int successr;
ArrayList<HashMap<String, String>> categoryList = new ArrayList<HashMap<String, String>>();
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(Chatting.this);
Bundle go = getIntent().getExtras();
String friend = go.getString("po");
String username = sp.getString("username", "anon");
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("friend", friend));
JSONObject json = jsonParser.makeHttpRequest(URL_CATEGORY, "POST",
params);
try {
List<NameValuePair> seen = new ArrayList<NameValuePair>();
seen.add(new BasicNameValuePair("username", username));
seen.add(new BasicNameValuePair("friend", friend));
successr = json.getInt(TAG_SUCCESS);
JSONArray categories = json.getJSONArray(TAG_POSTS);
for (int i = 0; i < categories.length(); i++) {
String id = categories.getJSONObject(i).getString("TAG_ID");
String time = categories.getJSONObject(i).getString(
"TAG_time");
String songs_count = categories.getJSONObject(i).getString(
"TAG_CATEGORIES_COUNT");
String from = categories.getJSONObject(i).getString(
"TAG_from");
state = categories.getJSONObject(i).getString(
"TAG_state");
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_ID, id);
map.put(TAG_time, time);
map.put(TAG_MESSAGE, songs_count);
map.put(TAG_from, from);
map.put(TAG_state, state);
categoryList.add(map);
}
} catch (Throwable e) {
e.printStackTrace();
}
return categoryList;
}
@Override
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
super.onPostExecute(result);
mAdapter = new MessageCategoryList(Chatting.this,result);
lv.setAdapter(mAdapter);
getListView().setSelection(priorPosition);
if(mAdapter == null)
{
lv.setAdapter(mAdapter);
}
else
{
mAdapter.notifyDataSetChanged();
}
}
}
class sendtext extends AsyncTask<String, String, String> {
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Chatting.this);
pDialog.setMessage("posting...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... arg0) {
List<NameValuePair> params = new ArrayList<NameValuePair>();
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(Chatting.this);
String post_username = sp.getString("username", "anon");
String friendname = sp.getString("value", "anon");
String picc = sp.getString("pic", "anon");
String message = mess.getText().toString();
params.add(new BasicNameValuePair("from", post_username));
params.add(new BasicNameValuePair("message", message));
params.add(new BasicNameValuePair("to", friendname));
params.add(new BasicNameValuePair("pic", picc));
JSONObject json = jsonParser.makeHttpRequest(url, "POST", params);
Log.d("Create Response", json.toString());
try {
int success = json.getInt(TAG_SUCCESS);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
if (flag == 1)
Toast.makeText(Chatting.this, " saved", Toast.LENGTH_LONG)
.show();
mess.setText("");
}
}
}
我做了一些研究，发现了这个教程 http://www.androidhive.info/2014/10/android-building-group-chat-app-using-sockets-part-1/但教程是关于群聊的……无论如何，他们都要为私有(private)聊天创建套接字……
最佳答案
你需要管理内存。 减慢垃圾收集器的频率以增加垃圾对象(内存)。尝试重构此代码。
套接字聊天 -> http://socket.io/blog/native-socket-io-and-android/
关于android 私有(private)聊天自动刷新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29078382/