环信官方Demo源码分析及SDK简单应用-LoginActivity

环信官方Demo源码分析及SDK简单应用

环信官方Demo源码分析及SDK简单应用-ChatDemoUI3.0
 
环信官方Demo源码分析及SDK简单应用-LoginActivity
 
环信官方Demo源码分析及SDK简单应用-主界面的三个fragment-会话界面
 
环信官方Demo源码分析及SDK简单应用-主界面的三个fragment-通讯录界面
 
环信官方Demo源码分析及SDK简单应用-主界面的三个fragment-设置界面
 
环信官方Demo源码分析及SDK简单应用-EaseUI
 
环信官方Demo源码分析及SDK简单应用-IM集成开发详案及具体代码实现
 
上文我们在已经登录的情况下来到的MainActivity，那么我们在没有登录情况下呢，当然是来登陆页面。下面我们来看登录页。
LoginActivity

/**

 * Copyright (C) 2016 Hyphenate Inc. All rights reserved.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *     http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.hyphenate.chatuidemo.ui;

​

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.content.DialogInterface.OnCancelListener;

import android.content.Intent;

import android.os.Bundle;

import android.text.Editable;

import android.text.TextUtils;

import android.text.TextWatcher;

import android.util.Log;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

​

import com.hyphenate.EMCallBack;

import com.hyphenate.chat.EMClient;

import com.hyphenate.chatuidemo.DemoApplication;

import com.hyphenate.chatuidemo.DemoHelper;

import com.hyphenate.chatuidemo.R;

import com.hyphenate.chatuidemo.db.DemoDBManager;

import com.hyphenate.easeui.utils.EaseCommonUtils;

​

/**

 * Login screen

 * 

 */

public class LoginActivity extends BaseActivity {

    private static final String TAG = "LoginActivity";

    public static final int REQUEST_CODE_SETNICK = 1;

    private EditText usernameEditText;

    private EditText passwordEditText;

​

    private boolean progressShow;

    private boolean autoLogin = false;

​

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

​

        // enter the main activity if already logged in

        if (DemoHelper.getInstance().isLoggedIn()) {

            autoLogin = true;

            startActivity(new Intent(LoginActivity.this, MainActivity.class));

​

            return;

        }

        setContentView(R.layout.em_activity_login);

​

        usernameEditText = (EditText) findViewById(R.id.username);

        passwordEditText = (EditText) findViewById(R.id.password);

​

        // if user changed, clear the password

        usernameEditText.addTextChangedListener(new TextWatcher() {

            @Override

            public void onTextChanged(CharSequence s, int start, int before, int count) {

                passwordEditText.setText(null);

            }

​

            @Override

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

​

            }

​

            @Override

            public void afterTextChanged(Editable s) {

​

            }

        });

        if (DemoHelper.getInstance().getCurrentUsernName() != null) {

            usernameEditText.setText(DemoHelper.getInstance().getCurrentUsernName());

        }

    }

​

    /**

     * login

     * 

     * @param view

     */

    public void login(View view) {

        if (!EaseCommonUtils.isNetWorkConnected(this)) {

            Toast.makeText(this, R.string.network_isnot_available, Toast.LENGTH_SHORT).show();

            return;

        }

        String currentUsername = usernameEditText.getText().toString().trim();

        String currentPassword = passwordEditText.getText().toString().trim();

​

        if (TextUtils.isEmpty(currentUsername)) {

            Toast.makeText(this, R.string.User_name_cannot_be_empty, Toast.LENGTH_SHORT).show();

            return;

        }

        if (TextUtils.isEmpty(currentPassword)) {

            Toast.makeText(this, R.string.Password_cannot_be_empty, Toast.LENGTH_SHORT).show();

            return;

        }

​

        progressShow = true;

        final ProgressDialog pd = new ProgressDialog(LoginActivity.this);

        pd.setCanceledOnTouchOutside(false);

        pd.setOnCancelListener(new OnCancelListener() {

​

            @Override

            public void onCancel(DialogInterface dialog) {

                Log.d(TAG, "EMClient.getInstance().onCancel");

                progressShow = false;

            }

        });

        pd.setMessage(getString(R.string.Is_landing));

        pd.show();

​

        // After logout，the DemoDB may still be accessed due to async callback, so the DemoDB will be re-opened again.

        // close it before login to make sure DemoDB not overlap

        DemoDBManager.getInstance().closeDB();

​

        // reset current user name before login

        DemoHelper.getInstance().setCurrentUserName(currentUsername);


        final long start = System.currentTimeMillis();

        // call login method

        Log.d(TAG, "EMClient.getInstance().login");

        EMClient.getInstance().login(currentUsername, currentPassword, new EMCallBack() {

​

            @Override

            public void onSuccess() {

                Log.d(TAG, "login: onSuccess");

​

​

                // ** manually load all local groups and conversation

                EMClient.getInstance().groupManager().loadAllGroups();

                EMClient.getInstance().chatManager().loadAllConversations();

​

                // update current user's display name for APNs

                boolean updatenick = EMClient.getInstance().pushManager().updatePushNickname(

                        DemoApplication.currentUserNick.trim());

                if (!updatenick) {

                    Log.e("LoginActivity", "update current user nick fail");

                }

​

                if (!LoginActivity.this.isFinishing() && pd.isShowing()) {

                    pd.dismiss();

                }

                // get user's info (this should be get from App's server or 3rd party service)

                DemoHelper.getInstance().getUserProfileManager().asyncGetCurrentUserInfo();

​

                Intent intent = new Intent(LoginActivity.this,

                        MainActivity.class);

                startActivity(intent);

​

                finish();

            }

​

            @Override

            public void onProgress(int progress, String status) {

                Log.d(TAG, "login: onProgress");

            }

​

            @Override

            public void onError(final int code, final String message) {

                Log.d(TAG, "login: onError: " + code);

                if (!progressShow) {

                    return;

                }

                runOnUiThread(new Runnable() {

                    public void run() {

                        pd.dismiss();

                        Toast.makeText(getApplicationContext(), getString(R.string.Login_failed) + message,

                                Toast.LENGTH_SHORT).show();

                    }

                });

            }

        });

    }

​


    /**

     * register

     * 

     * @param view

     */

    public void register(View view) {

        startActivityForResult(new Intent(this, RegisterActivity.class), 0);

    }

​

    @Override

    protected void onResume() {

        super.onResume();

        if (autoLogin) {

            return;

        }

    }

}

我们挨个来阅读

自动登录

if (DemoHelper.getInstance().isLoggedIn()) {

			autoLogin = true;

			startActivity(new Intent(LoginActivity.this, MainActivity.class));


			return;

		}

如果已经登录那么设置自动标志位为true，跳到主界面去。

用户名文本变动监听​

// if user changed, clear the password

        usernameEditText.addTextChangedListener(new TextWatcher() {

            @Override

            public void onTextChanged(CharSequence s, int start, int before, int count) {

                passwordEditText.setText(null);

            }

​

            @Override

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

​

            }

​

            @Override

            public void afterTextChanged(Editable s) {

​

            }

        });

        if (DemoHelper.getInstance().getCurrentUsernName() != null) {

            usernameEditText.setText(DemoHelper.getInstance().getCurrentUsernName());

        }

简单的文本变化监听，用户名变化了就把密码给清空一下。

下面我们来看登录逻辑

登录逻辑

首先判断当前是否有网络连接

	   if (!EaseCommonUtils.isNetWorkConnected(this)) {

			Toast.makeText(this, R.string.network_isnot_available, Toast.LENGTH_SHORT).show();

			return;

		}

我们来看看这个工具类是怎么写的

/**

     * check if network avalable

     * 

     * @param context

     * @return

     */

    public static boolean isNetWorkConnected(Context context) {

        if (context != null) {

            ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();

            if (mNetworkInfo != null) {

                return mNetworkInfo.isAvailable() && mNetworkInfo.isConnected();

            }

        }

​

        return false;

    }

大家常用的通用判断网络连接方法。

接着往下看

String currentUsername = usernameEditText.getText().toString().trim();

        String currentPassword = passwordEditText.getText().toString().trim();

​

        if (TextUtils.isEmpty(currentUsername)) {

            Toast.makeText(this, R.string.User_name_cannot_be_empty, Toast.LENGTH_SHORT).show();

            return;

        }

        if (TextUtils.isEmpty(currentPassword)) {

            Toast.makeText(this, R.string.Password_cannot_be_empty, Toast.LENGTH_SHORT).show();

            return;

        }

​

        progressShow = true;

        final ProgressDialog pd = new ProgressDialog(LoginActivity.this);

        pd.setCanceledOnTouchOutside(false);

        pd.setOnCancelListener(new OnCancelListener() {

​

            @Override

            public void onCancel(DialogInterface dialog) {

                Log.d(TAG, "EMClient.getInstance().onCancel");

                progressShow = false;

            }

        });

        pd.setMessage(getString(R.string.Is_landing));

        pd.show();

正常的取值，弹个进度框。

来看比较有意思的

        // After logout，the DemoDB may still be accessed due to async callback, so the DemoDB will be re-opened again.

        // close it before login to make sure DemoDB not overlap

        DemoDBManager.getInstance().closeDB();

​

        // reset current user name before login

        DemoHelper.getInstance().setCurrentUserName(currentUsername);

英文不好，大致的意思就是注销以后，DemoDB可能会依然在执行一些异步回调，所以DemoDB会再次重新打开，所以我们要在登陆之前确保DemoDB不会被Overlap。所以我们关闭一下数据库。

然后就是在登陆之前重新设置下当前登陆的用户名

下面就是具体的登陆实现了

EMClient.getInstance().login(currentUsername, currentPassword, new EMCallBack() {

​

   @Override

   public void onSuccess() {

      Log.d(TAG, "login: onSuccess");

​

​

      // ** manually load all local groups and conversation

       EMClient.getInstance().groupManager().loadAllGroups();

       EMClient.getInstance().chatManager().loadAllConversations();

​

       // update current user's display name for APNs

      boolean updatenick = EMClient.getInstance().pushManager().updatePushNickname(

            DemoApplication.currentUserNick.trim());

      if (!updatenick) {

         Log.e("LoginActivity", "update current user nick fail");

      }

​

      if (!LoginActivity.this.isFinishing() && pd.isShowing()) {

          pd.dismiss();

      }

      // get user's info (this should be get from App's server or 3rd party service)

      DemoHelper.getInstance().getUserProfileManager().asyncGetCurrentUserInfo();

​

      Intent intent = new Intent(LoginActivity.this,

            MainActivity.class);

      startActivity(intent);

​

      finish();

   }

​

   @Override

   public void onProgress(int progress, String status) {

      Log.d(TAG, "login: onProgress");

   }

​

   @Override

   public void onError(final int code, final String message) {

      Log.d(TAG, "login: onError: " + code);

      if (!progressShow) {

         return;

      }

      runOnUiThread(new Runnable() {

         public void run() {

            pd.dismiss();

            Toast.makeText(getApplicationContext(), getString(R.string.Login_failed) + message,

                  Toast.LENGTH_SHORT).show();

         }

      });

   }

});

我们看到环信封装了自己实现的登陆方法，并做了回调。

三个接口:

•  
• onSuccess() 成功了
• onError() 嗝屁了
• onProgress 处理中

我们看onSuccess中的代码

 

// ** manually load all local groups and conversation

   EMClient.getInstance().groupManager().loadAllGroups();

   EMClient.getInstance().chatManager().loadAllConversations();

​

   // update current user's display name for APNs

boolean updatenick = EMClient.getInstance().pushManager().updatePushNickname(

      DemoApplication.currentUserNick.trim());

if (!updatenick) {

   Log.e("LoginActivity", "update current user nick fail");

}

​

if (!LoginActivity.this.isFinishing() && pd.isShowing()) {

    pd.dismiss();

}

// get user's info (this should be get from App's server or 3rd party service)

DemoHelper.getInstance().getUserProfileManager().asyncGetCurrentUserInfo();

​

Intent intent = new Intent(LoginActivity.this,

      MainActivity.class);

startActivity(intent);

​

finish();

我们看到跳转到MainActivity之前通用做了相同的群组加载

                // ** manually load all local groups and conversation

                EMClient.getInstance().groupManager().loadAllGroups();

                EMClient.getInstance().chatManager().loadAllConversations();

  // update current user's display name for APNs

                boolean updatenick = EMClient.getInstance().pushManager().updatePushNickname(

                        DemoApplication.currentUserNick.trim());

                if (!updatenick) {

                    Log.e("LoginActivity", "update current user nick fail");

                }

​

                if (!LoginActivity.this.isFinishing() && pd.isShowing()) {

                    pd.dismiss();

                }

更新当前的推送昵称。

 

// get user's info (this should be get from App's server or 3rd party service)

DemoHelper.getInstance().getUserProfileManager().asyncGetCurrentUserInfo();

​

Intent intent = new Intent(LoginActivity.this,

      MainActivity.class);

startActivity(intent);

​

finish();

异步的从App后台或者三方库中获取用户信息，想想我们之前看他的分包的时候，是不是见到过parse这个包。就是这玩意。

然后跳转到主界面

 

/**

 * register

 * 

 * @param view

 */

public void register(View view) {

   startActivityForResult(new Intent(this, RegisterActivity.class), 0);

}

​

@Override

protected void onResume() {

   super.onResume();

   if (autoLogin) {

      return;

   }

}

然后便是注册了，是直接跳到注册界面去。onResume中如果已经登录直接return掉。

那么我们看完了这些Activity了，接着看啥呢？啰嗦了这么久，我们终于可以看具体的主界面的三个Fragment了。
 
环信官方Demo源码分析及SDK简单应用-主界面的三个fragment-会话界面