36.android 通过环信即时通讯，完成注册登录，被挤下线功能。

//第一步 导jar包 ，并add

//在build.gradle里，android里引用

useLibrary 'org.apache.http.legacy'
sourceSets {
    main {
        jniLibs.srcDirs = ['libs']
    }
}

//第二步 在AndroidManifest里写权限，写环信核心service

//权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.GET_TASKS" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

//环信

<!-- 设置环信应用的AppKey -->
<meta-data
    android:name="EASEMOB_APPKEY"
    android:value="1102180420253202#xiangmu" />
<!-- 声明SDK所需的service SDK核心功能 -->
<service
    android:name="com.hyphenate.chat.EMChatService"
    android:exported="true" />
<service
    android:name="com.hyphenate.chat.EMJobService"
    android:exported="true"
    android:permission="android.permission.BIND_JOB_SERVICE" />
<!-- 声明SDK所需的receiver -->
<receiver android:name="com.hyphenate.chat.EMMonitorReceiver">
    <intent-filter>
        <action android:name="android.intent.action.PACKAGE_REMOVED" />

        <data android:scheme="package" />
    </intent-filter>
    <!-- 可选filter -->
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
        <action android:name="android.intent.action.USER_PRESENT" />
    </intent-filter>
</receiver>

//第三步 新建MyApplication类继承Application,并在AndroidManifest里通过name调用。

//在MyApplication类里写个onCreate（）方法，里面写初始化：

 EMOptions options = new EMOptions();
// 默认添加好友时，是不需要验证的，改成需要验证
        options.setAcceptInvitationAlways(false);
// 是否自动将消息附件上传到环信服务器，默认为True是使用环信服务器上传下载，如果设为 false，需要开发者自己处理附件消息的上传和下载
        options.setAutoTransferMessageAttachments(true);
// 是否自动下载附件类消息的缩略图等，默认为 true 这里和上边这个参数相关联
        options.setAutoDownloadThumbnail(true);

//初始化
        EMClient.getInstance().init(this, options);
//在做打包混淆时，关闭debug模式，避免消耗不必要的资源
        EMClient.getInstance().setDebugMode(true);

//第四步在注册页面，填写账号后，把账号提交到服务器，这里是提交到环信即时通讯你新建应用的后台了。

new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            EMClient.getInstance().createAccount(mZhuCeShouJiHaoString, mZhuCeMiMaString);
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    if (!Main3Activity.this.isFinishing()) {
                        Toast.makeText(Main3Activity.this, "注册成功", Toast.LENGTH_SHORT).show();
                        Intent intent = getIntent();
                        intent.putExtra("name1", mZhuCeShouJiHaoString);
                        intent.putExtra("name2", mZhuCeMiMaString);
                        setResult(20, intent);
                        finish();
                    }
                }
            });
        } catch (HyphenateException e) {
            e.printStackTrace();
        }
    }
}).start();

//第五步，登录页面获取到账号，登录上去。

EMClient.getInstance().login(mEd1String,mEd2String,new EMCallBack() {//回调
    @Override
    public void onSuccess() {
        EMClient.getInstance().groupManager().loadAllGroups();
        EMClient.getInstance().chatManager().loadAllConversations();
//建立SharedPreferences 库，存放注册好的账号密码，密码其实没用，只判断账号就能进去。

        SharedPreferences names = getSharedPreferences("names", 0);
        SharedPreferences.Editor edit = names.edit();
        edit.putString("z",mEd1String);
        edit.putString("m",mEd2String);
        edit.commit();


        Log.d("main", "登录聊天服务器成功！");
        startActivity(new Intent(MainActivity.this,HomeActivity.class));
        finish();
    }

    @Override
    public void onProgress(int progress, String status) {

    }

    @Override
    public void onError(int code, String message) {
        Log.d("main", "登录聊天服务器失败！");
    }
});

//第六步 在首页onCreate（）方法里调用：

int pid = android.os.Process.myPid();
        String processAppName = getAppName(pid);
// 如果APP启用了远程的service，此application:onCreate会被调用2次
// 为了防止环信SDK被初始化2次，加此判断会保证SDK被初始化1次
// 默认的APP会在以包名为默认的process name下运行，如果查到的process name不是APP的process name就立即返回

        if (processAppName == null ||!processAppName.equalsIgnoreCase(HomeActivity.this.getPackageName())) {


            // 则此application::onCreate 是被service 调用的，直接返回
            return;
        }


        EMClient.getInstance().addConnectionListener(new MyConnectionListener());

//然后在onCreate（）方法外写这俩方法。

private String getAppName(int pID) {
    String processName = null;
    ActivityManager am = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);
    List l = am.getRunningAppProcesses();
    Iterator i = l.iterator();
    PackageManager pm = this.getPackageManager();
    while (i.hasNext()) {
        ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo) (i.next());
        try {
            if (info.pid == pID) {
                processName = info.processName;
                return processName;
            }
        } catch (Exception e) {
            // Log.d("Process", "Error>> :"+ e.toString());
        }
    }
    return processName;
}



//实现ConnectionListener接口
private class MyConnectionListener implements EMConnectionListener {
    @Override
    public void onConnected() {
    }
    @Override
    public void onDisconnected(final int error) {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                if(error == EMError.USER_REMOVED){
                    // 显示帐号已经被移除
                }else if (error == EMError.USER_LOGIN_ANOTHER_DEVICE) {
                    // 显示帐号在其他设备登录

                    Calendar calendar = Calendar.getInstance();
//建立一个AlertDialog，实现登录被顶了之后，弹出，退出或重新登录。
                    AlertDialog.Builder builder = new AlertDialog.Builder(HomeActivity.this);
                    builder.setTitle("下线通知");
                    builder.setMessage("您的账号在" + calendar.get(Calendar.HOUR_OF_DAY) + ":" + calendar.get(Calendar.MINUTE) + "在另一台手机登录了,如非本人操作,建议修改密码");
//点击重新登录获取到SharedPreferences 库里的账号密码 重新登录
                    builder.setPositiveButton("重新登录", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
//通过这个SharedPreferences 库得到账号密码，实现重新登录的功能
                            SharedPreferences name = getSharedPreferences("names", 0);
                            String name1 = name.getString("z", null);
                            String pass1 = name.getString("m", null);


                            EMClient.getInstance().login(name1,pass1,new EMCallBack() {//回调
                                @Override
                                public void onSuccess() {
                                    EMClient.getInstance().groupManager().loadAllGroups();
                                    EMClient.getInstance().chatManager().loadAllConversations();
                                    Log.d("main", "登录聊天服务器成功！");
                                    startActivity(new Intent(HomeActivity.this,HomeActivity.class));
                                }

                                @Override
                                public void onProgress(int progress, String status) {

                                }

                                @Override
                                public void onError(int code, String message) {
                                    Log.d("main", "登录聊天服务器失败！");
                                }
                            });
                        }
                    });
//退出 退到登录页面
                    builder.setNeutralButton("退出", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            EMClient.getInstance().logout(true);
                            Intent intent=new Intent(HomeActivity.this,MainActivity.class);
                            startActivity(intent);

                        }
                    });
                    //不关闭写法
                    builder.setCancelable(false);
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }
            }
        });
    }
}