Android笔记设计范例之日记APP实现全流程

前言

你们好，我是oy，介绍一个简易日记APP。

一、效果

1.启动页、引导页及登陆注册

2.日记相关功能

3.个人中心界面

二、功能介绍

1.主要功能

  • 实现应用启动页及引导页
  • 实现设置密码进入APP，对密码进行加密处理
  • 实现底部导航栏，分为日记列表，新建日记，个人中心模块
  • 实现对日记删除、修改、新增的基础功能
  • 实现圆形头像，通过相册及拍照并裁剪图片设置头像。可实时保存。
  • 实现网络更新个人中心美图。
  • 对密码展示及关闭，跳转应用设置界面
  • 动态获取拍照及相册访问权限

…

…

2.涉及知识点

  • activity与fragment数据传递、页面更新、相互跳转。
  • SharedPrefrenced存储、文件存储、文件加密。
  • Android应用权限获取及设置
  • 控件的使用：Button、EditText、AlertDialog、Imageview、ImageButton、viewPager2、
  • Toolbar、RecycleView、NavigationButton等
  • 布局的使用：LinearLayout、ConstraintLayout、RelativeLayout等
  • 调用Android系统应用
  • 自定义View：底部弹窗（比较复杂）、圆形头像
  • Glide框架使用：网络加载图片
  • Android框架：MVC

…

…

三、实现思路

MainActivity中使用BottomNavigationView、ViewPager2、Toolbar实现。

public class MainActivity extends AppCompatActivity {
 private BottomNavigationView bottomNavigationView;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 initToolbar();
 initFragment();
 initNavigationBottom();
 }
 @SuppressLint("ResourceAsColor")
 private void initNavigationBottom() {
 bottomNavigationView = findViewById(R.id.navigation_bottom);
 bottomNavigationView.setItemIconTintList(null);
 bottomNavigationView.setOnNavigationItemSelectedListener(itemSelectedListener);
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 return super.onCreateOptionsMenu(menu);
 }
 private void initFragment() {
 DiariesFragment diariesFragment = getDiariesFragment();
 if (diariesFragment == null) {
 diariesFragment = new DiariesFragment();
 ActivityUtils.addFragmentToActivity(getSupportFragmentManager(), diariesFragment, R.id.content);
 }
 }
 private DiariesFragment getDiariesFragment() {
 return (DiariesFragment) getSupportFragmentManager().findFragmentById(R.id.content);
 }
 private void initToolbar() {
 //设置顶部状态栏为透明
 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 Toolbar toolbar = findViewById(R.id.toolbar);
 setSupportActionBar(toolbar);
 }
 private final BottomNavigationView.OnNavigationItemSelectedListener itemSelectedListener = item -> {
 switch (item.getItemId()) {
 case R.id.menu_diary:
 MeController.setToolbarVisibility(this);
 ActivityUtils.removeFragmentTOActivity(getSupportFragmentManager(), getSupportFragmentManager().findFragmentById(R.id.content));
 ActivityUtils.addFragmentToActivity(getSupportFragmentManager(), new DiariesFragment(), R.id.content);
 break;
 case R.id.menu_me:
 findViewById(R.id.toolbar).setVisibility(View.GONE);
 ActivityUtils.removeFragmentTOActivity(getSupportFragmentManager(), getSupportFragmentManager().findFragmentById(R.id.content));
 ActivityUtils.addFragmentToActivity(getSupportFragmentManager(), new MeFragment(), R.id.content);
 break;
 case R.id.menu_new:
 bottomNavigationView.setVisibility(View.GONE);
 MeController.setToolbarVisibility(this);
 ActivityUtils.removeFragmentTOActivity(getSupportFragmentManager(), getSupportFragmentManager().findFragmentById(R.id.content));
 ActivityUtils.addFragmentToActivity(getSupportFragmentManager(), new AddDiaryFragment(), R.id.content);
 break;
 }
 return true;
 };
}

MainActivity的layout

<?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=".MainActivity">
 <com.google.android.material.appbar.AppBarLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content">
 <androidx.appcompat.widget.Toolbar
 android:id="@+id/toolbar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="?attr/colorPrimary"
 android:minHeight="?attr/actionBarSize"
 android:fitsSystemWindows="true"
 android:theme="@style/Widget.AppCompat.Toolbar"
 app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
 </com.google.android.material.appbar.AppBarLayout>
 <FrameLayout
 android:id="@+id/content"
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:layout_weight="1"/>
 <com.google.android.material.bottomnavigation.BottomNavigationView
 android:id="@+id/navigation_bottom"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 app:menu="@menu/menu_navigation"
 android:background="?android:attr/windowBackground"/>
</LinearLayout>

ViewPager2中切换不同fragment，对应导航栏新增日记、个人中心及日记列表。

public class DiariesFragment extends Fragment {
 private DiariesController mController;
 @Override
 public void onCreate(@Nullable Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 mController = new DiariesController(this);
 }
 @Nullable
 @Override
 public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
 View root = inflater.inflate(R.layout.fragment_diaries, container, false);
 mController.setDiariesList(root.findViewById(R.id.diaries_list));
 return root;
 }
 @Override
 public void onResume() {
 super.onResume();
 mController.loadDiaries();
 }
}

DiariesFragment的layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent" android:layout_height="match_parent"
 android:orientation="vertical">
 <androidx.recyclerview.widget.RecyclerView
 android:id="@+id/diaries_list"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"/>
</RelativeLayout>
public class AddDiaryFragment extends Fragment implements View.OnClickListener {
 private AddDiaryController mController;
 private View edit_layout;
 private Button btn_confirm;
 private EditText edit_title;
 private EditText edit_desc;
 @Override
 public void onCreate(@Nullable Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 mController = new AddDiaryController(this);
 }
 private void initView(View view) {
 btn_confirm = view.findViewById(R.id.add_diary_confirm);
 btn_confirm.setOnClickListener(this);
 edit_title = view.findViewById(R.id.edit_add_title);
 edit_desc = view.findViewById(R.id.edit_add_desc);
 edit_layout = view.findViewById(R.id.edit_layout);
 edit_layout.setOnClickListener(this);
 }
 @Override
 public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
 inflater.inflate(R.menu.menu_cancel, menu);
 }
 @Override
 public boolean onOptionsItemSelected(@NonNull MenuItem item) {
 switch (item.getItemId()) {
 case R.id.menu_cancel:
 mController.closeWriteDiary(getActivity().getSupportFragmentManager(), this);
 mController.setNavigationVisibility();
 return true;
 }
 return false;
 }
 @Nullable
 @Override
 public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
 View root = inflater.inflate(R.layout.fragment_add_diary, container, false);
 initView(root);
 return root;
 }
 @Override
 public void onDestroy() {
 super.onDestroy();
 }
 @Override
 public void onClick(View view) {
 switch (view.getId()) {
 case R.id.add_diary_confirm:
 mController.addDiaryToRepository(edit_title.getText().toString().trim(), edit_desc.getText().toString().trim());
 mController.setNavigationVisibility();
 mController.closeWriteDiary(getActivity().getSupportFragmentManager(), this);
 break;
 case R.id.edit_layout:
 mController.changeFocus(edit_desc);
 break;
 }
 }
}

AddDiaryFragment的layout

<?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"
 android:orientation="vertical">
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginTop="10dp"
 android:layout_marginStart="10dp"
 android:layout_marginEnd="10dp"
 android:orientation="vertical">
 <EditText
 android:id="@+id/edit_add_title"
 android:hint="@string/add_title_hint"
 android:minLines="1"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />
 </LinearLayout>
 <LinearLayout
 android:id="@+id/edit_layout"
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:layout_weight="1"
 android:layout_marginTop="5dp"
 android:layout_marginStart="10dp"
 android:layout_marginEnd="10dp"
 android:layout_marginBottom="10dp">
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:paddingStart="5dp"
 android:paddingTop="5dp"
 android:paddingEnd="5dp"
 android:paddingBottom="5dp"
 android:background="@drawable/edit_background">
 <EditText
 android:id="@+id/edit_add_desc"
 android:hint="@string/add_title_description"
 android:gravity="top"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:scrollbars="vertical"
 android:background="@null"/>
 </LinearLayout>
 </LinearLayout>
 <LinearLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:orientation="horizontal">
 <Button
 android:id="@+id/add_diary_confirm"
 android:text="@string/btn_ok"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"/>
 </LinearLayout>
</LinearLayout>

将应用密码加密保存与文件中。每次登陆获取密码并对比。

public class LoginDirectActivity extends AppCompatActivity implements View.OnClickListener {
 private EditText edit_input_text;
 private Button btn_comeIn;
 private TextView tv_setPsw;
 private static final String TAG = "Login2Activity";
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_direct_login);
 bindView();
 }
 private void bindView() {
 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 edit_input_text = findViewById(R.id.edit_login2_input_text);
 btn_comeIn = findViewById(R.id.btn_login2_comeIn);
 btn_comeIn.setOnClickListener(this);
 tv_setPsw = findViewById(R.id.tv_setPsw);
 tv_setPsw.setOnClickListener(this);
 }
 @Override
 public void onClick(View v) {
 switch (v.getId()) {
 case R.id.tv_setPsw:
 Intent setPsw_intent = new Intent(LoginDirectActivity.this, LoginActivity.class);
 startActivity(setPsw_intent);
 LoginDirectActivity.this.finish();
// overridePendingTransition(R.anim.out_to_left,R.anim.in_from_right);
 break;
 case R.id.btn_login2_comeIn:
 String psw = edit_input_text.getText().toString().trim();
 if (psw.isEmpty()) {
 Toast.makeText(this, "密码不能为空!", Toast.LENGTH_SHORT).show();
 return;
 }
 String readInfoByContext = FileUtils.readInfoByContext(this);
 if (psw.equals(readInfoByContext)) {
 Toast.makeText(this, "登录成功!", Toast.LENGTH_SHORT).show();
 Intent intent = new Intent(this, MainActivity.class);
 startActivity(intent);
// overridePendingTransition(R.anim.out_to_left,R.anim.in_from_right);
 } else {
 Toast.makeText(this, "密码不正确!", Toast.LENGTH_SHORT).show();
 }
 break;
 }
 }
}

LoginDirectActivity 的layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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=".view.LoginDirectActivity">
 <Button
 android:id="@+id/btn_login2_comeIn"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginStart="40dp"
 android:layout_marginEnd="40dp"
 android:text="进入"
 app:layout_constraintBottom_toTopOf="@+id/guideline5"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintStart_toStartOf="parent" />
 <LinearLayout
 android:id="@+id/linearLayout"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginStart="40dp"
 android:layout_marginEnd="40dp"
 android:gravity="center_vertical"
 android:orientation="horizontal"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="@+id/guideline7">
 <ImageView
 android:layout_width="32dp"
 android:layout_height="32dp"
 android:src="@mipmap/come_in_key" />
 <EditText
 android:id="@+id/edit_login2_input_text"
 android:hint="输入您的密码"
 android:inputType="textPassword"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />
 </LinearLayout>
 <androidx.constraintlayout.widget.Guideline
 android:id="@+id/guideline4"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 app:layout_constraintGuide_percent="0.22" />
 <androidx.constraintlayout.widget.Guideline
 android:id="@+id/guideline5"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 app:layout_constraintGuide_percent="0.58" />
 <TextView
 android:id="@+id/tv_login2_password_title"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:text="输入密码"
 android:textSize="30sp"
 android:textStyle="bold"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="@+id/guideline4" />
 <androidx.constraintlayout.widget.Guideline
 android:id="@+id/guideline7"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 app:layout_constraintGuide_percent="0.4" />
 <TextView
 android:id="@+id/tv_setPsw"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="设置密码"
 android:textStyle="bold"
 app:layout_constraintEnd_toEndOf="@+id/linearLayout"
 app:layout_constraintTop_toBottomOf="@+id/linearLayout" />
</androidx.constraintlayout.widget.ConstraintLayout>

使用SharedPrefrenced存储日记内容及标题。

public final class SharedPreferencesUtils {
 private static final SimpleArrayMap<String, SharedPreferencesUtils> mCaches = new SimpleArrayMap<>();
 private SharedPreferences mSharedPreferences;
 private SharedPreferencesUtils(final String spName, final int mode) {
 mSharedPreferences = YyApplication.get().getSharedPreferences(spName, mode);
 }
 public static SharedPreferencesUtils getInstance(String spName) {
 SharedPreferencesUtils utils = mCaches.get(spName);
 if (utils == null) {
 utils = new SharedPreferencesUtils(spName, Context.MODE_PRIVATE);
 }
 return utils;
 }
 public void put(final String key, final String value) {
 mSharedPreferences.edit().putString(key, value).apply();
 }
 public String get(final String key) {
 return mSharedPreferences.getString(key, "");
 }
 public void remove(final String key) {
 mSharedPreferences.edit().remove(key).apply();
 }
}

总结

以上就是今天讲的内容，本文仅仅简单介绍了Android日记APP，需要掌握上述知识点，能够较好的理解此应用逻辑。

作者:勤奋的oyoung原文地址:https://blog.csdn.net/m0_49534667/article/details/128087389
0
分享 2023-01-25

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