Android Studio的下載和安裝
下載和安裝

Android Support v4\v7\v13和AndroidX的區(qū)別及應用場景
區(qū)別及應用場景

項目的實踐
問候歡迎界面
跳轉界面
點擊注冊按鈕跳轉到注冊界面
Button tvRegister = findViewById(R.id.register_login);
tvRegister.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent =new Intent(LoginActivity.this,RegisterActivity.class);
startActivity(intent);
}
});

Toolbar頂部導航欄的設置
<include layout="@layout/tool_bar" />
1
登錄界面的頂部導航欄

private void initToolbar(){
toolbar = findViewById(R.id.title_toolbar);
toolbar.setTitle("登錄");
setSupportActionBar(toolbar);

    ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
        actionBar.setDisplayHomeAsUpEnabled(true);//設置返回鍵

// actionBar.setHomeButtonEnabled(true);//設置是否是首頁
}
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
LoginActivity.this.finish();
}
});
}

登錄注冊功能
驗證用戶名和密碼，正確后跳轉到我的界面
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
initToolbar();
initView();
initData();
btnLogin.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
String username=etUsername.getText().toString();
String password=etPassword.getText().toString();
SharedPreferences pref = getSharedPreferences("data", MODE_PRIVATE);
String name = pref.getString("username", "");
String pwd = pref.getString("password", "");
if (TextUtils.isEmpty(username)) {
Toast.makeText(LoginActivity.this, "用戶名不能為空", Toast.LENGTH_SHORT).show();
} else if (TextUtils.isEmpty(password)) {
Toast.makeText(LoginActivity.this, "密碼不能為空", Toast.LENGTH_SHORT).show();
// } else if (!username.equals(name)) {
// Toast.makeText(LoginActivity.this, "用戶名錯誤"+username+","+name , Toast.LENGTH_SHORT).show();
} else if (!MD5Utils.md5(password).equals(pwd)) {
Toast.makeText(LoginActivity.this, "密碼錯誤", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(LoginActivity.this, "登錄成功", Toast.LENGTH_SHORT).show();
saveLoginStatus(username,true);

                //返回我的界面
                Intent intent = new Intent();
                intent.putExtra("isLogin" , true);
                intent.putExtra("longinUser",username);
                setResult(RESULT_OK,intent);
                LoginActivity.this.finish();
            }
        }
    });
}

底部導航欄
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:context=".MainActivity">

<LinearLayout
    android:id="@+id/main_body"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    android:orientation="vertical">

</LinearLayout>

<RadioGroup
    android:id="@+id/btn_group"
    android:layout_width="match_parent"
    android:layout_height="56dp"
    android:layout_alignParentBottom="true"
    android:background="#F2F2F2"
    android:orientation="horizontal">

    <RadioButton
        android:id="@+id/btn_course"
        style="@style/TabMenuItem"
        android:drawableTop="@drawable/selector_nav_course"
        android:text="課程" />

    <RadioButton
        android:id="@+id/btn_execise"
        style="@style/TabMenuItem"
        android:drawableTop="@drawable/selector_nav_execise"
        android:text="習題" />

    <RadioButton
        android:id="@+id/btn_message"
        style="@style/TabMenuItem"
        android:drawableTop="@drawable/selector_nav_message"
        android:text="資訊" />

    <RadioButton
        android:id="@+id/btn_my"
        style="@style/TabMenuItem"
        android:drawableTop="@drawable/selector_nav_my"
        android:checked="true"
        android:text="我" />
</RadioGroup>

</RelativeLayout>

登出功能
// 退出登錄
exitLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(SettingActivity.this, "退出登錄", Toast.LENGTH_SHORT).show();

           new AlertDialog.Builder(SettingActivity.this)
                   .setTitle("退出")
                   .setMessage("確認退出登錄闹丐？")
                   .setPositiveButton("確認", new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int which) {
                           SharedUtils.clearLoginInfo(SettingActivity.this);

                           // 返回我的界面
                           Intent intent = new Intent();
                           intent.putExtra("isLogin", false);
                           setResult(RESULT_OK, intent);
                           SettingActivity.this.finish();
                       }
                   })
                   .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                       @Override
                       public void onClick(DialogInterface dialog, int which) {
                           dialog.dismiss();
                       }
                   })
                   .show();

       }
   });