模拟QQ聊天系统-安卓源代码

利用课余时间随便写的一个小东西，都是一起学习。

先上图：

package com.example.nanchen.listviewdemo.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.nanchen.listviewdemo.adapter_content.Msg;
import com.example.nanchen.listviewdemo.R;

import java.util.List;

/**
 * Created by nanchen on 2016/3/28.
 *
 */
public class MsgAdapter extends ArrayAdapter<Msg> {
    private int resourceId;

    public MsgAdapter(Context context, int resource, List<Msg> objects) {
        super(context, resource, objects);
        resourceId = resource;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Msg msg = getItem(position);
        viewHolder viewHolder;
        if(convertView == null){
            convertView = LayoutInflater.from(getContext()).inflate(resourceId,null);
            viewHolder = new viewHolder();
            viewHolder.leftLayout = (LinearLayout) convertView.findViewById(R.id.left_layout);
            viewHolder.rightLayout = (LinearLayout) convertView.findViewById(R.id.right_layout);
            viewHolder.leftMsg = (TextView) convertView.findViewById(R.id.left_msg);
            viewHolder.rightMsg = (TextView) convertView.findViewById(R.id.right_msg);
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (MsgAdapter.viewHolder) convertView.getTag();
        }
        if (msg.getType() == Msg.TYPE_RECEIVED){//若是收到的消息，则隐藏右布局，显示左布局
            viewHolder.leftLayout.setVisibility(View.VISIBLE);
            viewHolder.rightLayout.setVisibility(View.GONE);
            viewHolder.leftMsg.setText(msg.getContent());
        }else if(msg.getType() == Msg.TYPE_SENT){
            viewHolder.leftLayout.setVisibility(View.GONE);
            viewHolder.rightLayout.setVisibility(View.VISIBLE);
            viewHolder.rightMsg.setText(msg.getContent());
        }
        return convertView;
    }
    class viewHolder{
        LinearLayout leftLayout;
        LinearLayout rightLayout;
        TextView leftMsg;
        TextView rightMsg;
    }
}

　　

package com.example.nanchen.listviewdemo.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.nanchen.listviewdemo.adapter_content.Person;
import com.example.nanchen.listviewdemo.R;

import java.util.List;

/**
 *
 * Created by nanchen on 2016/3/22.
 */
public class PersonAdapter extends ArrayAdapter<Person> {

    private int resourceId;

    public PersonAdapter(Context context, int textViewResourceId, List<Person> objects) {
        super(context, textViewResourceId, objects);
        resourceId = textViewResourceId;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Person person = getItem(position);
        ViewHolder viewHolder;
        if(convertView == null){
            convertView = LayoutInflater.from(getContext()).inflate(resourceId ,null);
            viewHolder = new ViewHolder();
            viewHolder.imageView_person = (ImageView) convertView.findViewById(R.id.imageView_person);
            viewHolder.textView_name = (TextView) convertView.findViewById(R.id.textView_name);
            convertView.setTag(viewHolder);
        }else{
            //            view = convertView;
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.imageView_person.setImageResource(person.getImageId());
        viewHolder.textView_name.setText(person.getName());
        return convertView;
    }

    class ViewHolder{
        ImageView imageView_person;
        TextView textView_name;
    }
}
package com.example.nanchen.listviewdemo.adapter_content;

/**
 * Created by nanchen on 2016/3/28.
 * 存储消息类型和内容的类
 */
public class Msg {
    public static final int TYPE_RECEIVED = 0;
    public static final int TYPE_SENT = 1;
    private String content;
    private int type;

    public Msg(String content, int type) {
        this.content = content;
        this.type = type;
    }

    public String getContent() {
        return content;
    }

    public int getType() {
        return type;
    }
}
package com.example.nanchen.listviewdemo.adapter_content;

/**
 * Created by nanchen on 2016/3/22.
 */
public class Person {
    private String name;
    private int imageId;

    public Person(String name, int imageId) {
        this.name = name;
        this.imageId = imageId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getImageId() {
        return imageId;
    }

    public void setImageId(int imageId) {
        this.imageId = imageId;
    }
}
 1 package com.example.nanchen.listviewdemo.data;
 2 
 3 import android.os.Parcel;
 4 import android.os.Parcelable;
 5 
 6 /**
 7  *
 8  * Created by nanchen on 2016/3/22.
 9  */
10 public class User implements Parcelable {
11 
12     private String userName;
13     private String pwd;
14 
15     public String getPwd() {
16         return pwd;
17     }
18 
19     public void setPwd(String pwd) {
20         this.pwd = pwd;
21     }
22 
23     public String getUserName() {
24         return userName;
25     }
26 
27     public void setUserName(String userName) {
28         this.userName = userName;
29     }
30 
31     @Override
32     public int describeContents() {
33         return 0;
34     }
35 
36     @Override
37     public void writeToParcel(Parcel dest, int flags) {
38         dest.writeString(userName);
39         dest.writeString(pwd);
40     }
41 
42     //对象的创建器
43     public static final Parcelable.Creator<User> CREATOR = new Parcelable.Creator<User>(){
44 
45 
46         @Override
47         public User createFromParcel(Parcel source) {
48             User user = new User();
49             user.userName = source.readString();
50             user.pwd = source.readString();
51             return user;
52         }
53 
54         @Override
55         public User[] newArray(int size) {
56             return new User[0];
57         }
58     };
59 }
 1 package com.example.nanchen.listviewdemo;
 2 
 3 import android.app.Activity;
 4 
 5 import java.util.ArrayList;
 6 import java.util.List;
 7 
 8 /**
 9  * Created by nanchen on 2016/3/28.
10  * 退出程序的最佳方案，写一个活动收集器
11  */
12 public class ActivityCollector {
13     public static List<Activity> activities = new ArrayList<>();
14 
15     public static void addActivity(Activity activity){
16         activities.add(activity);
17     }
18 
19     public static void removeActivity(Activity activity){
20         activities.remove(activity);
21     }
22 
23     public static void finishAll(){
24         for (Activity activity:activities){
25             if (!activity.isFinishing()){
26                 activity.finish();
27             }
28         }
29     }
30 }
 1 package com.example.nanchen.listviewdemo;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.util.Log;
 6 
 7 /**
 8  * Created by nanchen on 2016/3/28.
 9  * 用于知晓当前是在哪一个活动
10  * 活动的最佳写法
11  */
12 public class BaseActivity extends Activity {
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         Log.d("BaseActivity", getClass().getSimpleName());
17         ActivityCollector.addActivity(this);
18     }
19 
20     @Override
21     protected void onDestroy() {
22         super.onDestroy();
23         ActivityCollector.removeActivity(this);
24     }
25 }
package com.example.nanchen.listviewdemo;

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.nanchen.listviewdemo.adapter.MsgAdapter;
import com.example.nanchen.listviewdemo.adapter_content.Msg;

import java.util.ArrayList;
import java.util.List;

public class ChatActivity extends BaseActivity {

    private ListView listView_msg;
    private EditText editText_input;
    private Button button_send,button_back,button_add;
    private MsgAdapter msgAdapter;
    private List<Msg> msgList = new ArrayList<>();
    private TextView textView_person_name;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);

        initMsg();
        msgAdapter = new MsgAdapter(this,R.layout.msg_item,msgList);
        listView_msg = (ListView) findViewById(R.id.listView_msg);
        listView_msg.setAdapter(msgAdapter);

        editText_input = (EditText) findViewById(R.id.editText_send);
        editText_input.clearFocus();
        button_send = (Button) findViewById(R.id.button_send);
        button_send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String content = editText_input.getText().toString();
                if(content.isEmpty()){//用户输入消息为空，则弹出一个警告框
                    final AlertDialog.Builder builder = new AlertDialog.Builder(ChatActivity.this);
                    builder.setTitle("警告");
                    builder.setMessage("输入的消息不能为空！");
                    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
                    builder.show();
                }else{
                    Msg msg = new Msg(content,Msg.TYPE_SENT);
                    msgList.add(msg);
                    msgAdapter.notifyDataSetChanged();//当有新消息时，刷新ListView中的显示
                    listView_msg.setSelection(msgList.size());//将ListView定位到最后一行
                    editText_input.setText("");//清空输入框中的内容

                }
            }
        });

        button_back = (Button) findViewById(R.id.button_back);
        button_back.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
            }
        });
        button_add = (Button) findViewById(R.id.button_add);
        button_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(ChatActivity.this,"你点击了添加按钮!!!",Toast.LENGTH_SHORT).show();
            }
        });

        textView_person_name = (TextView) findViewById(R.id.textView_person_name);
        Intent intent = getIntent();
        String person_name = intent.getStringExtra("PERSON_NAME");
        textView_person_name.setText(person_name);
    }

    private void initMsg() {
        Msg msg = new Msg("Hello!",Msg.TYPE_SENT);
        msgList.add(msg);
        Msg msg1 = new Msg("Hello!How are you?",Msg.TYPE_RECEIVED);
        msgList.add(msg1);
        Msg msg2 = new Msg("I am fine,and you?",Msg.TYPE_SENT);
        msgList.add(msg2);
        Msg msg3 = new Msg("I am ok!",Msg.TYPE_RECEIVED);
        msgList.add(msg3);
    }
}
package com.example.nanchen.listviewdemo;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

import com.example.nanchen.listviewdemo.data.User;

public class LoginActivity extends BaseActivity {

    private EditText editText_userName,editText_pwd;
    private CheckBox checkBox_pwd,checkBox_autoLogin;
    private SharedPreferences sp;
    private ImageButton imageButton_exit;
    private Button button_login;
    private String userName,pwd;
    private Button button_regist;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        //获得实例对象
        sp = this.getSharedPreferences("userInfo", Context.MODE_PRIVATE);
        editText_userName = (EditText) findViewById(R.id.editText_userName);
        editText_pwd = (EditText) findViewById(R.id.editText_pwd);
        imageButton_exit = (ImageButton) findViewById(R.id.ib_exit);
        button_login = (Button) findViewById(R.id.button_login);
        checkBox_autoLogin = (CheckBox) findViewById(R.id.checkBox_autoLogin);
        checkBox_pwd = (CheckBox) findViewById(R.id.checkBox_pwd);
        button_regist = (Button) findViewById(R.id.button_regist1);


        //判断记住密码框状态
        if(sp.getBoolean("ISCHECK",false)){//false是默认值
            //设置默认是选择状态
            checkBox_pwd.setChecked(true);
            userName = sp.getString("USER_NAME","");
            pwd = sp.getString("PWD","");
            editText_userName.setText(userName);
            editText_pwd.setText(pwd);

            //判断自动登录复选框状态
            if(sp.getBoolean("AUTO_ISCHECK",false)){

                //设置自动登录框状态
                checkBox_autoLogin.setChecked(true);

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


        button_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                userName = editText_userName.getText().toString();
                pwd = editText_pwd.getText().toString();

                if(TextUtils.isEmpty(userName) || TextUtils.isEmpty(pwd)){//如果用户名或者密码为空
                    Toast.makeText(LoginActivity.this, "用户名或密码不能为空！", Toast.LENGTH_SHORT).show();
                }else {
                    if(userName.equals("liushilin") && pwd.equals("luochunyan")){
                        Toast.makeText(LoginActivity.this,"登录成功！正在获取用户信息...",Toast.LENGTH_SHORT).show();

                        //如果用户选择记住密码，则把用户信息存在xml文件中
                        if(checkBox_pwd.isChecked()){
                            SharedPreferences.Editor editor = sp.edit();
                            editor.putString("USER_NAME",userName);
                            editor.putString("PWD",pwd);
                            editor.commit();
                        }

                        //主界面的跳转
                        Intent intent = new Intent(LoginActivity.this,MainActivity.class);

                        //                        intent.putExtra("USER_NAME",userName);
                        //                        intent.putExtra("PWD",pwd);

                        User user = new User();
                        user.setUserName(userName);
                        user.setPwd(pwd);

                        intent.putExtra("USER",user);

                        startActivity(intent);
                    }else{
                        Toast.makeText(LoginActivity.this,"用户名或密码不正确，请重新输入！",Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });

        //监听记住密码复选框的按钮事件
        checkBox_pwd.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                SharedPreferences.Editor editor = sp.edit();
                if(checkBox_pwd.isChecked()){
                    editor.putBoolean("ISCHECK", true).commit();
                }else{
                    editor.putBoolean("ISCHECK",false).commit();
                }

            }
        });

        //监听自动登录按钮事件
        checkBox_autoLogin.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(checkBox_autoLogin.isChecked()){
                    sp.edit().putBoolean("AUTO_ISCHECK",true).commit();
                }else {
                    sp.edit().putBoolean("AUTO_ISCHECK",false).commit();
                }
            }
        });

        //监听退出按钮事件
        imageButton_exit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
//                finish();
                ActivityCollector.finishAll();//退出当前应用程序
            }
        });

        button_regist.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(LoginActivity.this,RegistActivity.class));
            }
        });
    }

}

　　

package com.example.nanchen.listviewdemo;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ListView;

import com.example.nanchen.listviewdemo.adapter.PersonAdapter;
import com.example.nanchen.listviewdemo.adapter_content.Person;

import java.util.ArrayList;
import java.util.List;

/**
 * 使用线程机制模拟下拉加载数据的ListView控件使用
 */
public class MainActivity extends BaseActivity implements AbsListView.OnScrollListener{
    private static final int DATA_UPDATE = 0x1;
    private ListView listView;
    private List<Person> personList = new ArrayList<>();
    private PersonAdapter personAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listView = (ListView) findViewById(R.id.listView);
        listView.setOnScrollListener(this);

        View footerView = getLayoutInflater().inflate(R.layout.loading_layout,null);
        listView.addFooterView(footerView);
        initData();

        personAdapter = new PersonAdapter(this,R.layout.list_item,personList);
        listView.setAdapter(personAdapter);


        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

//                Toast.makeText(MainActivity.this,"你选择了"+personList.get(position).getName(),Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(MainActivity.this,ChatActivity.class);
                intent.putExtra("PERSON_NAME",personList.get(position).getName());
                startActivity(intent);
            }
        });

    }


    /**
     * 初始化数据
     */
    private void initData(){
        Person person1 = new Person("刘世麟",R.mipmap.a_1);
        personList.add(person1);
        Person person2 = new Person("罗春燕",R.mipmap.a_2);
        personList.add(person2);
        Person person3 = new Person("王足英",R.mipmap.a_3);
        personList.add(person3);
        Person person4 = new Person("蔡何",R.mipmap.a_4);
        personList.add(person4);
        Person person5 = new Person("李兴",R.mipmap.a_5);
        personList.add(person5);
        Person person6 = new Person("李强",R.mipmap.a_6);
        personList.add(person6);
        Person person7 = new Person("李添顺",R.mipmap.a_7);
        personList.add(person7);
        Person person8 = new Person("晏贵秀",R.mipmap.a_8);
        personList.add(person8);
        Person person9 = new Person("周芳",R.mipmap.a_9);
        personList.add(person9);
        Person person10 = new Person("韩思明",R.mipmap.a_10);
        personList.add(person10);
        Person person11 = new Person("晏蜀杰",R.mipmap.a_11);
        personList.add(person11);
        Person person12 = new Person("马巍乃",R.mipmap.a_12);
        personList.add(person12);
    }


    private int visibleLastIndex;//用来可显示的最后一条数据的索引
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if(personAdapter.getCount() == visibleLastIndex && scrollState == SCROLL_STATE_IDLE){
            new LoadDataThread().start();
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        visibleLastIndex = firstVisibleItem + visibleItemCount - 1;//减去最后一个加载中那条
    }

    /**
     * 线程间通信的机制
     */
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case DATA_UPDATE:
                    personAdapter.notifyDataSetChanged();
                    break;
            }
        }
    };

    /**
     * 模拟加载数据的线程
     */
    class LoadDataThread extends  Thread{
        @Override
        public void run() {
            initData();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            handler.sendEmptyMessage(DATA_UPDATE);//通过handler发送一个更新数据的标记
        }
    }

}

　　

package com.example.nanchen.listviewdemo;

import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.view.View;
import android.widget.Button;

public class RegistActivity extends BaseActivity {

    private Button button_regist;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_regist);
        button_regist = (Button) findViewById(R.id.button_regist);
        button_regist.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(RegistActivity.this);
                builder.setTitle("注册");
                builder.setMessage("确认注册吗？");
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        startActivity(new Intent(RegistActivity.this, LoginActivity.class));
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        startActivity(new Intent(RegistActivity.this, LoginActivity.class));
                    }
                });
                builder.show();
            }
        });
    }
}

　　

package com.example.nanchen.listviewdemo;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;

public class SplashActivity extends BaseActivity {

//    private static final int STATR_ACTIVITY = 0x1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
//        requestWindowFeature(Window.FEATURE_NO_TITLE);
//        handler.sendEmptyMessageDelayed(STATR_ACTIVITY,2000);
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                startActivity(new Intent(SplashActivity.this,LoginActivity.class));
            }
        },3000);



    }

//    private Handler handler = new Handler(){
//        @Override
//        public void handleMessage(Message msg) {
//            super.handleMessage(msg);
//            switch(msg.what){
//                case STATR_ACTIVITY:
//                    startActivity(new Intent(SplashActivity.this,LoginActivity.class));
//                    break;
//            }
//        }
//    };
}

　　

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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:orientation="vertical"
    tools:context="com.example.nanchen.listviewdemo.ChatActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="horizontal"
        android:layout_weight="1">

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="Back"
            android:textAllCaps="false"
            android:id="@+id/button_back"/>

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:id="@+id/textView_person_name"
            android:layout_weight="4"
            android:gravity="center"
            />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="+"
            android:textSize="18dp"
            android:id="@+id/button_add"/>

    </LinearLayout>

    <ListView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="7"
        android:id="@+id/listView_msg">

    </ListView>

    <LinearLayout
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:layout_height="0dp">

        <EditText
            android:layout_width="0dp"
            android:layout_weight="3"
            android:id="@+id/editText_send"
            android:hint="请输入你想输入的话.."
            android:layout_height="wrap_content"/>

        <Button
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="发送"
            android:textSize="20dp"
            android:id="@+id/button_send"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</LinearLayout>

　　

<LinearLayout 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:orientation="vertical"
                android:background="@mipmap/logo_bg"
                tools:context=".LoginActivity"
              android:weightSum="1">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.53"
        >

        <ImageButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/ib_exit"
            android:layout_alignParentRight="true"
            android:src="@mipmap/quit"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用 户 名："
            android:textSize="18dp"
            android:paddingTop="18dp"
            android:id="@+id/textView"
            android:layout_alignParentTop="true"
            android:layout_alignParentStart="true"/>

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText_userName"
            android:hint="请输入用户名..."
            android:layout_below="@+id/textView"
            android:layout_alignParentStart="true"
            android:layout_alignEnd="@+id/ib_exit"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密 码："
            android:textSize="18dp"
            android:id="@+id/textView2"
            android:layout_below="@+id/editText_userName"
            android:layout_alignParentStart="true"/>

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:hint="请输入密码..."
            android:ems="10"
            android:id="@+id/editText_pwd"
            android:layout_below="@+id/textView2"
            android:layout_alignParentStart="true"
            android:layout_alignParentEnd="true"/>

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="记住密码"
            android:id="@+id/checkBox_pwd"
            android:checked="false"
            android:layout_centerVertical="true"
            android:layout_alignParentStart="true"
            android:layout_marginStart="27dp"/>

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="自动登录"
            android:id="@+id/checkBox_autoLogin"
            android:checked="false"
            android:layout_below="@+id/checkBox_pwd"
            android:layout_alignStart="@+id/checkBox_pwd"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="登录"
            android:id="@+id/button_login"
            android:layout_alignBottom="@+id/checkBox_autoLogin"
            android:layout_toEndOf="@+id/checkBox_pwd"
            android:layout_marginStart="64dp"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="注册"
            android:id="@+id/button_regist1"
            android:textAllCaps="false"
            android:layout_alignTop="@+id/button_login"
            android:layout_toEndOf="@+id/button_login"/>


    </RelativeLayout>

</LinearLayout>

　　

<?xml version="1.0" encoding="utf-8"?>
<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="@mipmap/login_bg"
    tools:context="com.example.nanchen.listviewdemo.MainActivity">


    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:dividerHeight="3.1dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        />
</RelativeLayout>

　　

<?xml version="1.0" encoding="utf-8"?>
<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:orientation="vertical"
    android:background="@mipmap/login_bg"
    tools:context="com.example.nanchen.listviewdemo.RegistActivity">


    <LinearLayout
        android:orientation="horizontal"
        android:paddingTop="50dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="113dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true">


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:text="用户名："
            android:id="@+id/textView"/>

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText_name"
            android:layout_weight="1"/>
    </LinearLayout>


    <LinearLayout
        android:orientation="horizontal"
        android:paddingTop="100dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="113dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:id="@+id/linearLayout">


        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:text="密    码："
            android:id="@+id/textView3"/>

        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/editText"
            android:layout_weight="1"/>
    </LinearLayout>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="完成注册"
        android:id="@+id/button_regist"
        android:layout_marginTop="42dp"
        android:layout_below="@+id/linearLayout"
        android:layout_centerHorizontal="true"/>
</RelativeLayout>

　　

<?xml version="1.0" encoding="utf-8"?>
<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="@mipmap/app_start3"
    tools:context="com.example.nanchen.listviewdemo.SplashActivity">

</RelativeLayout>

　　

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:padding="6dp"
              android:layout_height="match_parent">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_person"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textView_name"/>
</LinearLayout>

　　

<?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">

    <ProgressBar
        style="?android:attr/progressBarStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/progressBar"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="正在玩命加载中..."
        android:id="@+id/textView"/>
</LinearLayout>

　　

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:padding="6dp"
              android:orientation="vertical"
              android:layout_height="match_parent">


    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/left_layout"
        android:layout_gravity="left"
        android:background="#c000dd">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:id="@+id/left_msg"
            android:layout_margin="10dp"
            android:textColor="#fff"
            />

    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/right_layout"
        android:layout_gravity="right"
        android:background="#00e6ff">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/right_msg"
            android:layout_gravity="center"
            android:layout_margin="10dp"/>

    </LinearLayout>
</LinearLayout>

　　

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原文地址：https://www.cnblogs.com/liushilin/p/5356563.html