2019-09-15安卓第一课

1.目录

1.1layout存放编写页面样式的xml文件

1.2drawable存放图片的文件

1.3mipmap存放图标文件

1.4value存放字符串和样式文件

1.5java存放编写功能的java文件

2.去除顶部导航栏

2.1编写样式

<style name="NoActionBar" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>

        <item name="windowActionBar">false</item>
        <item name="windowNoTitle">true</item>
<!--        设置工具栏的颜色-->
        <item name="colorControlNormal">@android:color/white</item>
    </style>

2.2 在AndroidManifest文件中引入样式

< android:theme="@style/NoActionBar">

3 在AnddroidManifest中设置主页面

 <activity android:name=".SplashActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

4线性布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bgimage"
    android:orientation="vertical"
    android:gravity="center_horizontal"
    tools:context=".Forget_pwd_Activity">

    <include layout="@layout/tool_bar"/>
    <TextView
        android:id="@+id/your_username"
        android:layout_width="300sp"
        android:layout_height="wrap_content"
        android:text="你的用户名是:"
        android:layout_marginBottom="8sp"
        android:layout_marginTop="20sp"
        android:textColor="#8a8a8a"
        android:textSize="20sp"
        android:visibility="gone"/>

    <EditText
        android:id="@+id/input_your_username"
        android:layout_width="300sp"
        android:layout_height="40sp"
        android:hint="请输入你的用户名"
        android:layout_gravity="center"
        android:drawableLeft="@drawable/see_user_small"
        android:drawablePadding="8dp"
        android:background="@drawable/border_text"
        android:paddingLeft="10sp"
        android:maxLines="1"
        android:visibility="gone"/>

    <TextView
        android:layout_width="300sp"
        android:layout_height="wrap_content"
        android:text="你的姓名是:"
        android:layout_marginBottom="8sp"
        android:layout_marginTop="20sp"
        android:textColor="#8a8a8a"
        android:textSize="20sp" />

    <EditText
        android:id="@+id/your_name"
        android:layout_width="300sp"
        android:layout_height="40sp"
        android:layout_marginBottom="20sp"
        android:hint="请输入你的姓名"
        android:layout_gravity="center"
        android:drawableLeft="@drawable/see_user_small"
        android:drawablePadding="8dp"
        android:background="@drawable/border_text"
        android:paddingLeft="10sp"
        android:maxLines="1" />


    <Button
        android:id="@+id/confirm_btn"
        android:layout_width="300sp"
        android:layout_height="40sp"
        android:background="#f3ad02"
        android:textSize="20sp"
        android:layout_gravity="center"
        android:textColor="@android:color/white"
        android:layout_marginBottom="8sp"
        android:text="保        存" />
</LinearLayout>

5保存和读取密码和用户名

保存

  /**
     * 保存用户信息
     * @param username
     * @param password
     */
    private void savePref(String username, String password) {
        SharedPreferences.Editor editor = getSharedPreferences("data",MODE_PRIVATE).edit();
//        editor.putString("username",username);
//        editor.putString("password",password);
//        editor.putString("sex",sex);
        editor.putString(username,password);
        editor.apply();
    }

读取

SharedPreferences sp = getSharedPreferences("data",MODE_PRIVATE);
        String pwd = sp.getString(username,"");

6页面之间的传值跳转和拿取数据

 String username = etUsername.getText().toString();
                            Intent intent = new Intent();
                            intent.putExtra("username",username);
                            setResult(RESULT_OK,intent);
                            finish();

        Intent intent = new Intent(LoginActivity.this,RegisterActivity.class);
        startActivityForResult(intent,1);

    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1 && resultCode == RESULT_OK && data!=null){
            String username = data.getStringExtra("username");
            lgUsername.setText(username);
//            lgUsername.setSelection(username.length());
        }
    }

7底部导航栏和碎片

底部导航栏样式文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".Main1Activity">
    <include layout="@layout/tool_bar"/>
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:id="@+id/fragment_main"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <RadioGroup
            android:layout_width="match_parent"
            android:layout_height="80dp"
            android:layout_marginTop="5sp"
            android:background="#eaeaea"
            android:id="@+id/radio_main"
            android:orientation="horizontal">

            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:id="@+id/rb_home"
                android:layout_weight="1"
                android:button="@null"
                android:drawableTop="@drawable/selector_home_drawable"
                android:layout_marginTop="10dp"
                android:layout_marginBottom="10dp"
                android:gravity="center"
                android:text="课程"
                android:textSize="18sp"
                android:textColor="@drawable/selector_text"/>
            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:id="@+id/rb_find"
                android:layout_weight="1"
                android:button="@null"
                android:drawableTop="@drawable/selector_find_drawable"
                android:layout_marginTop="10dp"
                android:layout_marginBottom="10dp"
                android:gravity="center"
                android:text="习题"
                android:textSize="18sp"
                android:textColor="@drawable/selector_text"
                />
            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:id="@+id/rb_web"
                android:layout_weight="1"
                android:button="@null"
                android:drawableTop="@drawable/selector_web_drawable"
                android:layout_marginTop="10dp"
                android:layout_marginBottom="10dp"
                android:gravity="center"
                android:text="资讯"
                android:textSize="18sp"
                android:textColor="@drawable/selector_text"
                />
            <RadioButton
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:id="@+id/rb_my"
                android:layout_weight="1"
                android:button="@null"
                android:drawableTop="@drawable/selector_my_drawable"
                android:layout_marginTop="10dp"
                android:layout_marginBottom="10dp"
                android:gravity="center"
                android:text="我的"
                android:textSize="18sp"
                android:checked="true"
                android:textColor="@drawable/selector_text"/>
        </RadioGroup>
    </LinearLayout>
</LinearLayout>

碎片

package com.example;


import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.myapplication.LoginActivity;
import com.example.myapplication.R;
import com.example.myapplication.SettingActivity;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link MySettingFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class MySettingFragment extends Fragment {
    private boolean isLogin;
    private Context mContext;
    private TextView tvUsername;
    private LinearLayout headLayout,historyLayout,settingLayout;
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
//    private static final String ARG_PARAM1 = "param1";
//    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
//    private String mParam1;
//    private String mParam2;


    public MySettingFragment() {
        // Required empty public constructor
    }

    // TODO: Rename and change types and number of parameters
    public static MySettingFragment newInstance() {
        MySettingFragment fragment = new MySettingFragment();
        //给fragment传参的方法
//        Bundle args = new Bundle();
//        args.putString(ARG_PARAM1, param1);
//        args.putString(ARG_PARAM2, param2);
//        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //接收fragment参数
//        if (getArguments() != null) {
//            mParam1 = getArguments().getString(ARG_PARAM1);
//            mParam2 = getArguments().getString(ARG_PARAM2);
//        }
    }

    //初始化Fragment的xml界面上所有控件和数据，相当于Acticity的onCreate()作用
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        //1获取fragment的
        this.mContext = getContext();
        this.isLogin = checkLoginStatus();
        View view = inflater.inflate(R.layout.fragment_my_setting, container, false);
        headLayout = view.findViewById(R.id.ll_head);
        tvUsername = view.findViewById(R.id.click_login);
        setUsername(isLogin);
        historyLayout = view.findViewById(R.id.list_history);
        settingLayout = view.findViewById(R.id.list_setting);
        //3设置事件监听
        headLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (isLogin){

                }else {
                    Intent intent = new Intent(mContext, LoginActivity.class);
                    startActivityForResult(intent,1);
                }
            }
        });
        historyLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (isLogin){

                }else {
                    Toast.makeText(mContext,"请先登录",Toast.LENGTH_SHORT).show();
                }
            }
        });
        settingLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (isLogin){
                    Intent intent = new Intent(mContext, SettingActivity.class);
                    startActivityForResult(intent,2);

                }else {
                    Toast.makeText(mContext,"请先登录",Toast.LENGTH_SHORT).show();
                }
            }
        });
        return view;

    }

    private void setUsername(boolean isLogin) {
        if (isLogin){
            tvUsername.setText(readLoginInfo());
        } else {
            tvUsername.setText("点击登录");
        }
    }

    //获取登录状态
    private boolean checkLoginStatus(){
        SharedPreferences sp = mContext.getSharedPreferences("data",Context.MODE_PRIVATE);
        return sp.getBoolean("isLogin",false);
    }

    private String readLoginInfo() {
        SharedPreferences sp = mContext.getSharedPreferences("data",Context.MODE_PRIVATE);
        return sp.getString("loginUser","");
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 1 && resultCode == Activity.RESULT_OK && data!=null) {
            isLogin = data.getBooleanExtra("isLogin", false);
            setUsername(isLogin);
        } else if (requestCode == 2 && resultCode == Activity.RESULT_OK && data!=null){
            isLogin =data.getBooleanExtra("isLogin",false);
            setUsername(isLogin);
        }
    }
}

在drawable文件下建立选择器

image.png

图标选择器(selector)

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="false" android:drawable="@drawable/my"/>
    <item android:state_checked="true" android:drawable="@drawable/my_selected"/>
</selector>

文字选择器

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_checked="false" android:color="#8a8a8a"/>
    <item android:state_checked="true" android:color="#09bb07"/>
</selector>