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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

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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

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