确保绑定服务

时间：2013-03-07 15:23:35

标签： android android-service

像我之前的许多人一样，我正在使用asmack和Openfire编写聊天应用程序。 它仍然非常基本，但我已经设法发送和接收用户Loged In with Spark和另一个模拟器的消息。

经过一些SO读取后，我决定为我的XMPP连接创建一个服务，并将其绑定到每个Activity。我目前有三项活动

  • MainActivity（用户登录并连接到XMPPconnection）。
  • RosterActivity（包含用户联系人的列表视图）
  • ChatActivity

我的问题有两个：

  1. 是否有必要将每个活动绑定到服务，或者是否可以将MainActivity绑定到它并将XMPPConnection作为额外传递？如果是这样，如何完成传递？

  2. 登录并启动RosterActivity后，我在onCreate（）方法中绑定服务。在onStart方法中，如果我检查mBound变量，它总是假的。我试过SystemClock.sleep（）只是为了看看它是否会起作用而它没有。让我感到困惑的是，当我第一次写这个Activity时，我使用了一个按钮，当点击它时，它将启动填充列表的过程。这非常有效。

    那么我错过了什么？我显然不希望用户只需按一个按钮来查看联系人，我希望列表在onStart（）中填充。当我尝试从onClickListener内部访问服务时为什么绑定服务，为什么它不能在onStart上工作。

    我猜它与异步绑定有关，但我正在试图找出确切的内容。

    3. MainActivity：

    package com.example.smack_text;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity 
{
XMPPService mService;
boolean mBound = false;
Button logBtn;
Button disBtn;
EditText userTxt;
EditText passTxt;

@Override
protected void onCreate(Bundle savedInstanceState) 
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//      BIND SERVICE
Intent intent = new Intent(getApplicationContext(), XMPPService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}

@Override
protected void onStart() 
{
super.onStart();

userTxt = (EditText) findViewById(R.id.userTxt);
passTxt = (EditText) findViewById(R.id.passTxt);

logBtn = (Button) findViewById(R.id.logBtn);
disBtn = (Button) findViewById(R.id.disBtn);
logBtn.setOnClickListener(new OnClickListener() 
    {

    @Override
    public void onClick(View v) 
        {
        final String user = new String(userTxt.getText().toString()); 
        final String pass = new String(passTxt.getText().toString());

        if(user=="" || pass=="")
            {
            Toast.makeText(getApplicationContext(), "Enter name and pass",           
Toast.LENGTH_LONG).show();
            }
        if(mBound)
        {
                mService.connect(user,pass);
                Log.d("Alex","connected");
        }
        else
        {
            Log.d("Alex","error in connecting");
        }
        Intent roster = new Intent();
        roster.setClass(getApplicationContext(), RosterActivity.class);
        startActivity(roster);
    }
});

disBtn.setOnClickListener(new OnClickListener() 
{
@Override
public void onClick(View v) 
    {
    if(mBound)
        {
        mService.disconnect();
        Log.d("Alex","disconnected");
        }
    else
        {
        Log.d("Alex","error in disconnecting");
        }
    }
});


}

@Override
protected void onDestroy() 
{
// Unbind from the service
if (mBound) 
    {
    unbindService(mConnection);
    mBound = false;
    }
super.onDestroy();
}

private ServiceConnection mConnection = new ServiceConnection() 
{
@Override
public void onServiceConnected(ComponentName name, IBinder service) 
    {
    mService = ((XMPPService.LocalBinder)service).getService();
    mBound = true;
    }

@Override
public void onServiceDisconnected(ComponentName name) 
    {
     mBound = false;
    }
};
}

    RosterActivity：

    package com.example.smack_text;

import java.util.Collection;
import org.jivesoftware.smack.Roster;
import org.jivesoftware.smack.RosterEntry;
import org.jivesoftware.smack.packet.Presence;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.os.SystemClock;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class RosterActivity extends ListActivity{

boolean mBound = false;
XMPPService mService;
Button btn;


@Override
public void onCreate(Bundle savedInstanceState)
    {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.roster);

    Intent intent = new Intent(getApplicationContext(), XMPPService.class);
    bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
    }

@Override
public void onStart(){
    super.onStart();
//      btn = (Button) findViewById(R.id.button1);
//      btn.setOnClickListener(new OnClickListener() {

//          @Override
//          public void onClick(View v) {

            if(mBound){
                Log.d("Alex","roster connected");

                Roster roster = mService.connection.getRoster();
//                  XWRIS TO RELOAD DN DOULEYEI
                roster.reload();

                Integer length = roster.getEntryCount();
                String[] users = new String[length];
                String[] userPresence = new String[length];

                Integer i=0;

                Collection<RosterEntry> entries = roster.getEntries();

                for(RosterEntry entry:entries){
                    users[i] = entry.getName();


Presence tmpPres = roster.getPresence(entry.getUser());
                    userPresence[i] = tmpPres.toString();
                    Log.d("RosterActivity" , entry.getUser().toString());

                    i++;

                }


ArrayAdapter<String> adapter = new ArrayAdapter<String>    (RosterActivity.this,

android.R.layout.simple_expandable_list_item_1,     users);
                    setListAdapter(adapter);



            }
            else{

Toast.makeText(getApplicationContext(), "service not bound yet", Toast.LENGTH_LONG).show();
            }

        }
//      });
//  }

@Override
protected void onDestroy() {

    // Unbind from the service
    if (mBound) {
        unbindService(mConnection);
        mBound = false;
    }
    super.onDestroy();
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {


    // Creating the dialog
    AlertDialog.Builder builder = new AlertDialog.Builder(this);

    Object o = l.getItemAtPosition(position);
    String str = o.toString();
    Log.d("Roster Activity",str);

    builder.setTitle("Start Chat?");
    builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            Intent chat = new Intent();
            chat.setClass(getApplicationContext(), ChatActivity.class);
            startActivity(chat);
        }
    });


    AlertDialog alert = builder.create();
    alert.show();
}




private ServiceConnection mConnection = new ServiceConnection() {


    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        mService = ((XMPPService.LocalBinder)service).getService();

        mBound = true;

    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
         mBound = false;

    }
    };

}

    XMPPService：

    package com.example.smack_text;

import java.io.File;

import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.Build;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class XMPPService extends Service{

XMPPConnection connection;
private final IBinder mBinder = new LocalBinder();


    @Override
    public void onCreate(){
        super.onCreate();
    }

    /**
     * Class used for the client Binder.  Because we know this service always
     * runs in the same process as its clients, we don't need to deal with IPC.
     */
    public class LocalBinder extends Binder {
        XMPPService getService() {
            return XMPPService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    public void connect(final String user, final String pass) {


        Log.d("Xmpp Alex","in service");


        ConnectionConfiguration config = new ConnectionConfiguration("10.0.2.2",5222);

//          KEYSTORE SETTINGS
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            config.setTruststoreType("AndroidCAStore");
            config.setTruststorePassword(null);
            config.setTruststorePath(null);
        } else {
            config.setTruststoreType("BKS");
            String path = System.getProperty("javax.net.ssl.trustStore");
            if (path == null)
                path = System.getProperty("java.home") + File.separator + "etc"
                    + File.separator + "security" + File.separator
                    + "cacerts.bks";
            config.setTruststorePath(path);
        }

//          Create XMPP Connection

        connection = new XMPPConnection(config);

//          THELEI TO RUNNABLE ALLIWS DN TREXEI

        new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    connection.connect();
                    connection.login(user, pass);
                    if(connection.isConnected()){
                        Log.d("Alex", "connected biatch!");
//                          try {
//                              Thread.sleep(5000);
//                          } catch (InterruptedException e) {
//                              e.printStackTrace();
//                          }
                    }
                    else{
                        Log.d("Alex","not connected");
                    }


                } catch (XMPPException e) {
                    e.printStackTrace();
                }
            }
        }).start();


    }

    public void disconnect(){
        if(connection.isConnected()){
            connection.disconnect();
        }

else{Toast.makeText(getApplicationContext(), "not     connected",Toast.LENGTH_LONG).show();
        }
    }

}

    布局：

    activity_main.xml中

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
tools:context=".MainActivity" >

<EditText
    android:id="@+id/userTxt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/textView1"
    android:layout_marginLeft="30dp"
    android:layout_marginTop="27dp"
    android:background="#FFFFFF"
    android:ems="10"
    android:inputType="textPersonName" >

    <requestFocus />
</EditText>

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/userTxt"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="14dp"
    android:layout_marginTop="52dp"
    android:background="#FFFFFF"
    android:text="User Name :" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/textView1"
    android:layout_below="@+id/userTxt"
    android:layout_marginTop="62dp"
    android:background="#FFFFFF"
    android:text="Password :" />

<EditText
    android:id="@+id/passTxt"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/userTxt"
    android:layout_below="@+id/textView2"
    android:layout_marginTop="58dp"
    android:background="#FFFFFF"
    android:ems="10"
    android:inputType="textPassword" />

<Button
    android:id="@+id/logBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignRight="@+id/textView2"
    android:layout_below="@+id/passTxt"
    android:layout_marginTop="66dp"
    android:background="#FFFFFF"
    android:text="Log In" />

<Button
    android:id="@+id/disBtn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/logBtn"
    android:layout_alignRight="@+id/userTxt"
    android:background="#FFFFFF"
    android:text="disconnect" />

</RelativeLayout>

    roster.xml 

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button" />

<ListView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
</ListView>

</LinearLayout>

1 个答案:

答案 0 :(得分：0)

我一直认为这样的事情可能有点令人困惑，所以我写了一些支持，让这更简单到Vapor API - 一个Android框架，旨在让app dev变得更容易。

它隐式管理你的所有绑定，并且还允许你完全由服务类检索绑定（你不需要在你的代码中维护连接对象，它就是为你完成的）。

如果你想尝试一下，你可以按照你想要的那样做（使用VaporActivity和VaporServiceBindable）：

public class RosterActivity extends VaporActivity{

   public void create(VaporBundle bundle){

      $.srv(XMPPService.class); // optionally, first start the service

      // set up the callback for when the service is bound
      $.hook(SERVICE_BIND).hookIn(new $$hookee(){

          public void call(String hookName, VaporBundle args){

             // put your code here that depends on the binding...

          }

      });

      // bind to the service
      $.bind(XMPPService.class);


    }

}

这显然是您描述的问题类型的简化框架，基于事实绑定是异步的。

更重要的是，如果您想在活动中使用服务中的方法，您可以随时随地轻松完成：

this.service(XMPPService.class).foo(); // some method in the service

引擎盖下检索为您自动创建的早期ServiceConnection，并为您提供对服务的IBinder的访问权限。

如果您有兴趣，也应该查看VaporService。它在自己的线程中运行服务，您可以随意暂停，休眠和重启，让您完全控制您的服务，而无需担心血腥的细节。

希望有所帮助。

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