AndroidManifest.xml：<?xml version="
1.0" encoding="utf
-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.
diaryapp">
<uses
-feature
android:name="android.hardware.camera"
android:required="false" />
<uses
-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses
-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses
-permission android:name="android.permission.CAMERA" />
<application
android:allowBackup="true"
android:hardwareAccelerated="true"
android:largeHeap="true"
android:requestLegacyExternalStorage="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.HelloWorld">
<activity
android:name=".MainActivity"
android:label="@string/title_activity_main"
android:exported="false" />
<activity
android:name=".
DiaryActivity"
android:label="@string/title_activity_
diary"
android:exported="false" />
<activity
android:name=".RegisterActivity"
android:label="@string/title_activity_register"
android:exported="false" />
<activity
android:name=".LoginActivity"
android:label="@string/title_activity_login"
android:exported="true">
<intent
-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent
-filter>
</activity>
</application>
</manifest>
DiaryAdapter： package com.example.
diaryapp.adapters;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.
diaryapp.utils.GlideEngine;
import com.example.
diaryapp.
DiaryActivity;
import com.example.
diaryapp.R;
import com.example.
diaryapp.models.
Diary;
import java.util.List;
public class
DiaryAdapter extends RecyclerView.Adapter<
DiaryAdapter.
DiaryViewHolder> {
private Context context;
private List<
Diary>
diaryList;
private int userId;
public
DiaryAdapter
(Context context,List<
Diary>
diaryList,int userId
){
this.context=context;
this.
diaryList=
diaryList;
this.userId=userId; // 通过构造函数传递 userId
}
// 当数据更新时调用此方法
@SuppressLint
("NotifyDataSetChanged"
)
public void updateDiaries
(List<
Diary> newDiaries
){
this.
diaryList.clear
();
this.
diaryList.addAll
(newDiaries
);
notifyDataSetChanged
();
}
@NonNull
@Override
public
DiaryAdapter.
DiaryViewHolder onCreateViewHolder
(@NonNull ViewGroup parent, int viewType
) {
View view= LayoutInflater.from
(context
).inflate
(R.layout.item_
diary,parent,false
);
return new
DiaryViewHolder
(view
);
}
// 绑定视图持有者方法
@Override
public void onBindViewHolder
(@NonNull
DiaryAdapter.
DiaryViewHolder holder, int position
) {
Diary diary=
diaryList.get
(position
);
holder.tvTitle.setText
(diary.getTitle
());
holder.tvDate.setText
(diary.getDate
());
holder.tvContent.setText
(diary.getContent
());
holder.tvWordCount.setText
("字数：" +
diary.getContent
().length
());
if
(diary.getImagePath
() != null && !
diary.getImagePath
().isEmpty
())
{
GlideEngine engine = GlideEngine.createGlideEngine
();
engine.loadImage
(context,
diary.getImagePath
(),holder.ivImage
);
}
else {
holder.ivImage.setBackgroundColor
(context.getResources
().getColor
(android.R.color.darker_gray
));
}
holder.itemView.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
Intent intent=new Intent
(context,
DiaryActivity.class
);
intent.putExtra
("
diaryId",
diary.getId
());
intent.putExtra
("userId",userId
); // 确保传递正确的 userId
context.startActivities
(new Intent[]{intent}
);
}
}
);
}
@Override
public int getItemCount
() {
return
diaryList.size
();
}
public static class
DiaryViewHolder extends RecyclerView.ViewHolder {
private TextView tvTitle,tvDate,tvContent,tvWordCount;
private ImageView ivImage;
public
DiaryViewHolder
(@NonNull View itemView
) {
super
(itemView
);
tvTitle=itemView.findViewById
(R.id.tvTitle
);
tvDate=itemView.findViewById
(R.id.tvDate
);
tvContent=itemView.findViewById
(R.id.tvContent
);
ivImage=itemView.findViewById
(R.id.ivImage
);
tvWordCount=itemView.findViewById
(R.id.tvWordCount
);
}
}
}
Diary：package com.example.
diaryapp.models;
public class
Diary {
private int id;
private String title;
private String content;
private String date;
private String imagePath;
public
Diary(){}
public int getId
() {
return id;
}
public void setId
(int id
) {
this.id = id;
}
public String getTitle
() {
return title;
}
public void setTitle
(String title
) {
this.title = title;
}
public String getContent
() {
return content;
}
public void setContent
(String content
) {
this.content = content;
}
public String getDate
() {
return date;
}
public void setDate
(String date
) {
this.date = date;
}
public String getImagePath
() {
return imagePath;
}
public void setImagePath
(String imagePath
) {
this.imagePath = imagePath;
}
}
DatabaseHelper：package com.example.
diaryapp.utils;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import com.example.
diaryapp.models.
Diary;
import java.util.ArrayList;
import java.util.List;
public class DatabaseHelper extends SQLiteOpenHelper {
//数据库信息
private static final String DATABASE_NAME = "
DiaryApp.db";
private static final int DATABASE_VERSION =
1;
//用户表信息
private static final String TABLE_USER = "user";
private static final String COLUMN_USER_ID = "id";
private static final String COLUMN_USER_USERNAME = "username";
private static final String COLUMN_USER_PASSWORD = "password";
//日记表信息
private static final String TABLE_
DIARY = "
diary";
private static final String COLUMN_
DIARY_ID = "id";
private static final String COLUMN_
DIARY_USER_ID = "user_id";
private static final String COLUMN_
DIARY_TITLE = "title";
private static final String COLUMN_
DIARY_CONTENT = "content";
private static final String COLUMN_
DIARY_DATE = "date";
private static final String COLUMN_
DIARY_IMAGE_PATH = "image_path";
public DatabaseHelper
(Context context
) {
super
(context, DATABASE_NAME,null,DATABASE_VERSION
);
}
@Override
public void onCreate
(SQLiteDatabase db
) {
//创建用户表
String createUserTable = "CREATE TABLE " + TABLE_USER + "
(" +
COLUMN_USER_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_USER_USERNAME + " TEXT UNIQUE, " +
COLUMN_USER_PASSWORD + " TEXT
)";
db.execSQL
(createUserTable
);
//创建日记表
String create
DiaryTable = "CREATE TABLE " + TABLE_
DIARY + "
(" +
COLUMN_
DIARY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
COLUMN_
DIARY_USER_ID + " INTEGER, " +
COLUMN_
DIARY_TITLE + " TEXT, " +
COLUMN_
DIARY_CONTENT + " TEXT, " +
COLUMN_
DIARY_DATE + " TEXT, " +
COLUMN_
DIARY_IMAGE_PATH + " TEXT
)";
db.execSQL
(create
DiaryTable
);
}
@Override
public void onUpgrade
(SQLiteDatabase db, int oldVersion, int newVersion
) {
//升级数据库时的操作
db.execSQL
("DROP TABLE IF EXISTS " + TABLE_USER
);
db.execSQL
("DROP TABLE IF EXISTS " + TABLE_
DIARY);
onCreate
(db
);
}
//用户相关操作
public long addUser
(String username,String password
){
SQLiteDatabase db = null;
try {
db=this.getWritableDatabase
();
ContentValues values = new ContentValues
();
values.put
(COLUMN_USER_USERNAME, username
);
values.put
(COLUMN_USER_PASSWORD,password
);
return db.insert
(TABLE_USER,null,values
);
}catch
(Exception e
){
e.printStackTrace
();
return
-1;
}finally {
if
(db!=null
){
db.close
();
}
}
}
public boolean checkUser
(String username, String password
){
SQLiteDatabase db = null;
Cursor cursor = null;
boolean exists = false;
try {
db=this.getReadableDatabase
();
cursor = db.rawQuery
(
"SELECT * FROM " + TABLE_USER + " WHERE " +
COLUMN_USER_USERNAME + "=? AND " + COLUMN_USER_PASSWORD + "=?",
new String[]{username,password}
);
exists = cursor.getCount
() > 0;
}catch
(Exception e
){
e.printStackTrace
();
}finally {
if
(cursor != null
){
cursor.close
();
}
if
(db!=null
){
db.close
();
}
}
return exists;
// Cursor cursor = db.rawQuery
(
// "SELECT * FROM " + TABLE_USER + " WHERE " +
// COLUMN_USER_USERNAME + "=? AND " + COLUMN_USER_PASSWORD + "=?",
// new String[]{username,password}
//
);
// boolean exists = cursor.getCount
() > 0;
// Log.d
("DatabaseHelper","checkUser: username=" + username + ", exists=" + exists
);
// cursor.close
();
// return exists;
}
public int getUserId
(String username
){
SQLiteDatabase db = null;
Cursor cursor=null;
int userId=
-1;
try {
db = this.getReadableDatabase
();
cursor = db.rawQuery
(
"SELECT " + COLUMN_USER_ID + " FROM " + TABLE_USER + " WHERE " +
COLUMN_USER_USERNAME + "=?",
new String[]{username}
);
if
(cursor.moveToFirst
()) {
// 如果cursor不为空且移动到第一条记录，获取用户ID
userId = cursor.getInt
(cursor.getColumnIndexOrThrow
(COLUMN_USER_ID
));
}
}catch
(Exception e
){
e.printStackTrace
();
}finally {
if
(cursor!=null
){
cursor.close
();
}
if
(db!=null
){
db.close
();
}
}
return userId;
}
//日记相关操作
public long add
Diary(int userId,
Diary diary){
SQLiteDatabase db = getWritableDatabase
();
try {
db.beginTransaction
();
ContentValues values = new ContentValues
();
values.put
(COLUMN_
DIARY_USER_ID, userId
);
values.put
(COLUMN_
DIARY_TITLE,
diary.getTitle
());
values.put
(COLUMN_
DIARY_CONTENT,
diary.getContent
());
values.put
(COLUMN_
DIARY_DATE,
diary.getDate
());
values.put
(COLUMN_
DIARY_IMAGE_PATH,
diary.getImagePath
());
long result = db.insert
(TABLE_
DIARY,null,values
);
db.setTransactionSuccessful
();
return result;
}catch
(Exception e
){
e.printStackTrace
();
return
-1;
}finally {
db.endTransaction
();
// if
(db != null
){
// db.endTransaction
();
// db.close
();
// }
}
}
public List<
Diary> getDiariesByUserId
(int userId
){
List<
Diary> diaries = new ArrayList<>
();
SQLiteDatabase db = getReadableDatabase
();
Cursor cursor = null;
try {
db = this.getReadableDatabase
();
cursor = db.rawQuery
(
"SELECT * FROM " + TABLE_
DIARY + " WHERE " +
COLUMN_
DIARY_USER_ID + "=? ORDER BY " + COLUMN_
DIARY_DATE
+ " DESC",
new String[]{String.valueOf
(userId
)}
);
while
(cursor.moveToNext
()) {
Diary diary = new
Diary();
diary.setId
(cursor.getInt
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_ID
)));
diary.setTitle
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_TITLE
)));
diary.setContent
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_CONTENT
)));
diary.setDate
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_DATE
)));
diary.setImagePath
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_IMAGE_PATH
)));
diaries.add
(diary);
}
}catch
(Exception e
){
e.printStackTrace
();
}finally {
if
(cursor != null
){
cursor.close
();
}
// if
(db != null
){
// db.close
();
// }
}
return diaries;
}
public
Diary get
DiaryById
(int
diaryId
){
SQLiteDatabase db = getReadableDatabase
();
Cursor cursor = null;
try {
db = this.getReadableDatabase
();
cursor = db.rawQuery
(
"SELECT * FROM " + TABLE_
DIARY + " WHERE " + COLUMN_
DIARY_ID + "=?",
new String[]{String.valueOf
(diaryId
)}
);
if
(cursor.moveToFirst
()) {
Diary diary = new
Diary();
diary.setId
(cursor.getInt
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_ID
)));
diary.setTitle
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_TITLE
)));
diary.setContent
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_CONTENT
)));
diary.setDate
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_DATE
)));
diary.setImagePath
(cursor.getString
(cursor.getColumnIndexOrThrow
(COLUMN_
DIARY_IMAGE_PATH
)));
return
diary;
}
}catch
(Exception e
){
e.printStackTrace
();
}finally {
if
(cursor != null
){
cursor.close
();
}
// if
(db != null
){
//// db.close
(); // 确保关闭数据库连接
// }
}
// cursor.close
();
return null;
}
public long update
Diary(Diary diary){
SQLiteDatabase db = getWritableDatabase
();
try {
ContentValues values = new ContentValues
();
values.put
(COLUMN_
DIARY_TITLE,
diary.getTitle
());
values.put
(COLUMN_
DIARY_CONTENT,
diary.getContent
());
values.put
(COLUMN_
DIARY_DATE,
diary.getDate
());
values.put
(COLUMN_
DIARY_IMAGE_PATH,
diary.getImagePath
());
return db.update
(TABLE_
DIARY,
values,
COLUMN_
DIARY_ID + "=?",
new String[]{String.valueOf
(diary.getId
())}
);
// db.close
(); // 确保关闭数据库连接
// Log.d
("DatabaseHelper","update
Diary: result=" + result
); //调试日志
// return result;
}catch
(Exception e
){
e.printStackTrace
();
return
-1;
}finally {
// if
(db != null
){
// db.close
();
// }
}
}
public void delete
Diary(int
diaryId
) {
SQLiteDatabase db = getWritableDatabase
();
try {
db.beginTransaction
();
db.delete
(TABLE_
DIARY, COLUMN_
DIARY_ID + "=?", new String[]{
String.valueOf
(diaryId
)
}
);
db.setTransactionSuccessful
();
}catch
(Exception e
){
e.printStackTrace
();
}finally {
db.endTransaction
();
}
// finally {
// if
(db != null
){
// db.close
();
// }
}
// int result=db.delete
(TABLE_
DIARY,
// COLUMN_
DIARY_ID + "=?",
// new String[]{String.valueOf
(diaryId
)}
);
// db.close
(); // 确保关闭数据库连接
// Log.d
("DatabaseHelper","delete
Diary: result=" + result
);//调试日志
// }
}
GlideEngine：package com.example.
diaryapp.utils;
import android.content.Context;
import android.widget.ImageView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.resource.bitmap.CenterCrop;
import com.bumptech.glide.load.resource.bitmap.RoundedCorners;
import com.example.
diaryapp.R;
import com.luck.picture.lib.engine.ImageEngine;
import com.luck.picture.lib.utils.ActivityCompatHelper;
public class GlideEngine implements ImageEngine {
@Override
public void loadImage
(Context context, String url, ImageView imageView
) {
if
(!ActivityCompatHelper.assertValidRequest
(context
)) {
return;
}
try {
Glide.with
(context
)
.load
(url
)
.into
(imageView
);
} catch
(Exception e
) {
e.printStackTrace
();
imageView.setBackgroundColor
(context.getResources
().getColor
(android.R.color.darker_gray
));
}
}
@Override
public void loadImage
(Context context, ImageView imageView,
String url, int maxWidth, int maxHeight
) {
if
(!ActivityCompatHelper.assertValidRequest
(context
)) {
return;
}
Glide.with
(context
)
.load
(url
)
.override
(maxWidth, maxHeight
)
.into
(imageView
);
}
@Override
public void loadAlbumCover
(Context context, String url, ImageView imageView
) {
if
(!ActivityCompatHelper.assertValidRequest
(context
)) {
return;
}
Glide.with
(context
)
.asBitmap
()
.load
(url
)
.override
(180,
180
)
.sizeMultiplier
(0.5f
)
.transform
(new CenterCrop
(), new RoundedCorners
(8))
.placeholder
(R.drawable.ic_launcher_background
)
.into
(imageView
);
}
@Override
public void loadGridImage
(Context context, String url, ImageView imageView
) {
if
(!ActivityCompatHelper.assertValidRequest
(context
)) {
return;
}
Glide.with
(context
)
.load
(url
)
.override
(200,
200
)
.centerCrop
()
.placeholder
(R.drawable.ic_launcher_background
)
.into
(imageView
);
}
@Override
public void pauseRequests
(Context context
) {
Glide.with
(context
).pauseRequests
();
}
@Override
public void resumeRequests
(Context context
) {
Glide.with
(context
).resumeRequests
();
}
private GlideEngine
() {
}
private static final class InstanceHolder {
static final GlideEngine instance = new GlideEngine
();
}
public static GlideEngine createGlideEngine
() {
return InstanceHolder.instance;
}
}
DiaryActivity：package com.example.
diaryapp;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import com.example.
diaryapp.models.
Diary;
import com.example.
diaryapp.utils.DatabaseHelper;
import com.example.
diaryapp.utils.GlideEngine;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;
public class
DiaryActivity extends AppCompatActivity {
// 声明界面组件和相关变量
private EditText etTitle,etContent;
private TextView tvDate;
private ImageView ivImage;
private Button btnSave,btnDelete,btnAddImage;
private DatabaseHelper dbHelper;
private int userId;
private int
diaryId =
-1;
private String imagePath;
@Override
protected void onCreate
(Bundle savedInstanceState
) {
super.onCreate
(savedInstanceState
);
EdgeToEdge.enable
(this
);
setContentView
(R.layout.activity_
diary);// 设置布局文件
// 获取传递过来的用户ID和日记ID
userId = getIntent
().getIntExtra
("userId",
-1);
diaryId = getIntent
().getIntExtra
("
diaryId",
-1);
if
(userId ==
-1){ // 检查用户ID是否有效
// 用户ID无效，可能是登录流程的问题
Toast.makeText
(this, "用户ID无效", Toast.LENGTH_SHORT
).show
();
finish
();
return;
}
// 初始化界面组件
initView
();
// 如果是编辑日记，加载日记内容
if
(diaryId !=
-1){
Diary diary=dbHelper.get
DiaryById
(diaryId
);
if
(diary != null
){
etTitle.setText
(diary.getTitle
()); // 设置日记标题
etContent.setText
(diary.getContent
()); // 设置日记内容
tvDate.setText
(diary.getDate
()); // 设置日记日期
imagePath=
diary.getImagePath
(); // 获取图片路径
if
(imagePath != null && !imagePath.isEmpty
()) {
try {
// 使用Glide加载图片
GlideEngine engine = GlideEngine.createGlideEngine
();
engine.loadImage
(this, imagePath, ivImage
);
} catch
(Exception e
) {
e.printStackTrace
();
ivImage.setBackgroundColor
(getResources
().getColor
(android.R.color.darker_gray
)); // 设置默认背景
}
}
// 显示删除按钮
btnDelete.setVisibility
(View.VISIBLE
);
}else {
// 日记ID无效，可能是数据库查询的问题
Toast.makeText
(this, "日记ID无效", Toast.LENGTH_SHORT
).show
();
finish
();
}
}else {
// 设置当前日期
tvDate.setText
(getCurrentDate
());
}
// 添加图片按钮监听
btnAddImage.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
//selectImage
();
// 改：if
(!view.isEnabled
() || !view.isClickable
()){
// return;
// }
showImageOptions
(); // 显示添加图片选项
}
}
);
// 保存按钮监听
btnSave.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
// 改：if
(!view.isEnabled
() || !view.isClickable
()){
// return;
// }
save
Diary(); // 保存日记
}
}
);
// 删除按钮监听
btnDelete.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
// 改：if
(!view.isEnabled
() || !view.isClickable
()){
// return;
// }
delete
Diary(); // 删除日记
}
}
);
}
// private void selectImage
() {
// // 创建选择图片的Intent
// Intent pickIntent=new Intent
(Intent.ACTION_GET_CONTENT
);
// pickIntent.setType
("image/*"
);
//
// // 创建拍照的Intent
// Intent captureIntent = new Intent
(MediaStore.ACTION_IMAGE_CAPTURE
);
// if
(captureIntent.resolveActivity
(getPackageManager
()) != null
) {
// startActivityForResult
(captureIntent,2
);
// }
// //intent.setAction
(Intent.ACTION_GET_CONTENT
);
// startActivityForResult
(pickIntent,
1);
// }
private void showImageOptions
() {
// 创建弹出菜单，提供两个选项：从图库选择和拍照
String[] options = {"从图库选择","拍照"};
new AlertDialog.Builder
(this
)
.setTitle
("添加图片"
)
.setItems
(options,
(dialog,which
) -> {
if
(which == 0
){ //从图库选择
Intent pickIntent = new Intent
(Intent.ACTION_GET_CONTENT
);
pickIntent.setType
("image/*"
);
startActivityForResult
(pickIntent,
1);
}else if
(which ==
1){ //拍照
Intent captureIntent = new Intent
(MediaStore.ACTION_IMAGE_CAPTURE
);
if
(captureIntent.resolveActivity
(getPackageManager
()) != null
){
startActivityForResult
(captureIntent,2
);
}else {
Toast.makeText
(DiaryActivity.this, "无法调用摄像头", Toast.LENGTH_SHORT
).show
();
}
}
}
)
.show
();
}
private void save
Diary() {
String title=etTitle.getText
().toString
().trim
();
String content=etContent.getText
().toString
().trim
();
String date=tvDate.getText
().toString
();
if
(title.isEmpty
() || content.isEmpty
()){ // 检查输入是否为空
return;
}
Diary diary=new
Diary();
diary.setTitle
(title
);
diary.setContent
(content
);
diary.setDate
(date
);
diary.setImagePath
(imagePath
); // 确保图片路径不为空
if
(diaryId !=
-1){
diary.setId
(diaryId
);
dbHelper.update
Diary(diary); // 更新日记
}else {
dbHelper.add
Diary(userId,
diary); // 添加新日记
}
//返回主界面
Intent resultIntent = new Intent
();
setResult
(RESULT_OK,resultIntent
);
finish
();
}
private void delete
Diary() {
// //删除日记
// dbHelper.delete
Diary(diaryId
);
new AlertDialog.Builder
(this
)
.setTitle
("确认删除"
)
.setMessage
("确定要删除这篇日记吗？"
)
.setPositiveButton
("删除", new DialogInterface.OnClickListener
() {
@Override
public void onClick
(DialogInterface dialog, int which
) {
// 使用独立的 DatabaseHelper 实例执行删除操作
DatabaseHelper helper=new DatabaseHelper
(DiaryActivity.this
);
helper.delete
Diary(diaryId
);
// dbHelper.delete
Diary(diaryId
); // 删除日记
// 设置结果码为RESULT_OK，表示操作成功,返回主界面MainActivity
Intent resultIntent = new Intent
();
setResult
(RESULT_OK,resultIntent
);
finish
();
}
}
)
.setNegativeButton
("取消",null
)
.show
();
}
@Override
protected void onDestroy
() {
super.onDestroy
();
// 释放可能持有的资源
if
(btnSave!=null
){
btnSave.setOnClickListener
(null
);
}
if
(btnDelete!=null
){
btnDelete.setOnClickListener
(null
);
}
if
(btnAddImage!=null
){
btnAddImage.setOnClickListener
(null
);
}
}
@Override
protected void onPause
() {
super.onPause
();
// 暂停时释放资源
if
(isFinishing
()) {
// 清理可能的临时资源
}
}
@Override
protected void onResume
() {
super.onResume
();
// 恢复时重新初始化资源
}
private String getCurrentDate
(){
// 返回当前日期的字符串表示
return new java.text.SimpleDateFormat
("yyyy
-MM
-dd HH:mm:ss"
).format
(new Date
());
}
protected void onActivityResult
(int requestCode,int resultCode,Intent data
){
super.onActivityResult
(requestCode,resultCode,data
);
if
(isFinishing
() || isDestroyed
()){
return;
}
// 确保调用super.onActivityResult
if
(requestCode ==
1 && resultCode == RESULT_OK && data != null
){
// 处理从图库选择的图片
Uri selectedImage = data.getData
();
if
(selectedImage != null
) { // 检查selectedImage是否为null
try {
// 将图片保存到应用私有目录
Bitmap bitmap = MediaStore.Images.Media.getBitmap
(getContentResolver
(), selectedImage
);
String filename = "
diary_image_" + System.currentTimeMillis
() + ".jpg";
File file = new File
(getExternalFilesDir
(null
), filename
);
// File fileDir = getExternalFilesDir
(null
);
// if
(fileDir != null && !fileDir.exists
()){
// fileDir.mkdir
();
// }
// File file = new File
(fileDir,filename
);
FileOutputStream fos = new FileOutputStream
(file
);
bitmap.compress
(Bitmap.CompressFormat.JPEG,
100, fos
);
fos.flush
();
fos.close
();
imagePath = file.getAbsolutePath
();
// 改：ivImage.setImageBitmap
(bitmap
); // 显示图片
// 使用Glide加载图片
GlideEngine engine = GlideEngine.createGlideEngine
();
engine.loadImage
(this, imagePath, ivImage
);
} catch
(IOException e
) {
e.printStackTrace
();
//改：
ivImage.setBackgroundColor
(getResources
().getColor
(android.R.color.darker_gray
));
}
}
// Glide.with
(this
).load
(imagePath
).into
(ivImage
);
// }catch
(IOException e
){
// e.printStackTrace
();
// }
}else if
(requestCode == 2 && resultCode == RESULT_OK && data != null
){
//处理拍照结果
Bundle extras = data.getExtras
();
Bitmap imageBitmap =
(Bitmap
) extras.get
("data"
);
if
(extras != null
) { // 检查extras是否为null
// Bitmap imageBitmap =
(Bitmap
) extras.get
("data"
);
if
(imageBitmap != null
) {// 检查photo是否为null
try {
String filename = "
diary_image_" + System.currentTimeMillis
() + ".jpg";
File file = new File
(getExternalFilesDir
(null
), filename
);
FileOutputStream fos = new FileOutputStream
(file
);
imageBitmap.compress
(Bitmap.CompressFormat.JPEG,
100, fos
);
fos.flush
();
fos.close
();
imagePath = file.getAbsolutePath
();
// 改：ivImage.setImageBitmap
(imageBitmap
); // 显示图片
// 使用Glide加载图片
GlideEngine engine = GlideEngine.createGlideEngine
();
engine.loadImage
(this, imagePath, ivImage
);
} catch
(IOException e
) {
e.printStackTrace
();
ivImage.setBackgroundColor
(getResources
().getColor
(android.R.color.darker_gray
));
}
}
}
}
}
private void initView
() {
// 初始化界面组件
etTitle=findViewById
(R.id.etTitle
);
etContent=findViewById
(R.id.etContent
);
tvDate=findViewById
(R.id.tvDate
);
ivImage=findViewById
(R.id.ivImage
);
btnAddImage=findViewById
(R.id.btnAddImage
);
btnSave=findViewById
(R.id.btnSave
);
btnDelete=findViewById
(R.id.btnDelete
);
dbHelper=new DatabaseHelper
(this
); // 初始化数据库助手
// userId=getIntent
().getIntExtra
("userId",
-1);
//
diaryId=getIntent
().getIntExtra
("
diaryId",
-1);
}
}
LoginActivity：package com.example.
diaryapp;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import com.example.
diaryapp.utils.DatabaseHelper;
public class LoginActivity extends AppCompatActivity {
private EditText etUsername,etPassword;
private CheckBox cbRemember;
private DatabaseHelper dbHelper;
@Override
protected void onCreate
(Bundle savedInstanceState
) {
super.onCreate
(savedInstanceState
);
EdgeToEdge.enable
(this
);
setContentView
(R.layout.activity_login
);
// 初始化界面组件
initView
();
// 获取SharedPreferences中的保存信息
SharedPreferences prefs=getSharedPreferences
("
DiaryApp",MODE_PRIVATE
);
String username=prefs.getString
("username",""
);
String password=prefs.getString
("password",""
);
// 如果用户名存在但密码不存在，删除用户名
if
(username.isEmpty
() || password.isEmpty
()){
prefs.edit
().remove
("username"
).remove
("password"
).apply
();
}
boolean remember=prefs.getBoolean
("remember",false
);
etUsername.setText
(username
);
etPassword.setText
(password
);
cbRemember.setChecked
(remember
);
// 登录按钮监听
Button btnLogin=findViewById
(R.id.btnLogin
);
btnLogin.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
login
();
}
}
);
// 注册按钮监听
Button btnRegister=findViewById
(R.id.btnRegister
);
btnRegister.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
Intent intent=new Intent
(LoginActivity.this, RegisterActivity.class
);
startActivity
(intent
);
}
}
);
}
private void login
() {
String username=etUsername.getText
().toString
().trim
();
String password=etPassword.getText
().toString
().trim
();
boolean remember=cbRemember.isChecked
();
// 验证输入
if
(username.isEmpty
() || password.isEmpty
()){
Toast.makeText
(this, "用户名和密码不能为空", Toast.LENGTH_SHORT
).show
();
return;
}
// 保存登录信息到SharedPreferences
SharedPreferences prefs=getSharedPreferences
("
DiaryApp",MODE_PRIVATE
);
SharedPreferences.Editor editor=prefs.edit
();
// 如果记住密码被勾选，则保存密码；否则清空密码
if
(remember
){
editor.putString
("username",username
);
editor.putString
("password",password
);
}else {
// editor.remove
("username"
);
editor.remove
("password"
); // 确保未勾选时清空密码
}
editor.putBoolean
("remember",remember
);
editor.apply
();
// 验证用户
if
(dbHelper.checkUser
(username,password
)){
Toast.makeText
(this, "登录成功", Toast.LENGTH_SHORT
).show
();
Intent intent=new Intent
(LoginActivity.this,MainActivity.class
);
intent.putExtra
("username",username
);
startActivity
(intent
);
finish
(); // 关闭登录界面，避免返回时重复登录
}else {
Toast.makeText
(this, "用户名或密码错误", Toast.LENGTH_SHORT
).show
();
}
}
private void initView
() {
// 初始化界面组件
etUsername=findViewById
(R.id.etUsername
);
etPassword=findViewById
(R.id.etPassword
);
cbRemember=findViewById
(R.id.cbRemember
);
dbHelper=new DatabaseHelper
(this
);
}
}MainActivity：package com.example.
diaryapp;
import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.
diaryapp.adapters.
DiaryAdapter;
import com.example.
diaryapp.models.
Diary;
import com.example.
diaryapp.utils.DatabaseHelper;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private RecyclerView rv
DiaryList;
private
DiaryAdapter
diaryAdapter;
private List<
Diary>
diaryList;
private DatabaseHelper dbHelper;
private String username;
private int userId;
@Override
protected void onCreate
(Bundle savedInstanceState
) {
super.onCreate
(savedInstanceState
);
EdgeToEdge.enable
(this
);
setContentView
(R.layout.activity_main
);
dbHelper=new DatabaseHelper
(this
);
// 获取传递过来的用户名
username=getIntent
().getStringExtra
("username"
);
if
(username == null
){
// 用户名为空，可能是登录流程的问题
Toast.makeText
(this, "用户名为空", Toast.LENGTH_SHORT
).show
();
finish
();
return;
}
userId=dbHelper.getUserId
(username
);
if
(userId ==
-1){
// 用户ID无效，可能是数据库查询的问题
Toast.makeText
(this, "用户ID无效", Toast.LENGTH_SHORT
).show
();
finish
();
return;
}
// 初始化界面组件
initView
();
// 加载日记
loadDiaries
();
// 添加日记按钮监听
Button btnAdd
Diary=findViewById
(R.id.btnAdd
Diary);
// 在添加日记的按钮点击事件中
btnAdd
Diary.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
Intent intent=new Intent
(MainActivity.this,
DiaryActivity.class
);
intent.putExtra
("userId",userId
);
startActivityForResult
(intent,
1);
}
}
);
}
protected void onActivityResult
(int requestCode,int resultCode,Intent data
){
super.onActivityResult
(requestCode,resultCode,data
);
if
(requestCode ==
1 && resultCode == RESULT_OK
){
// List<
Diary> diaries = dbHelper.getDiariesByUserId
(userId
);
//
diaryAdapter.updateDiaries
(diaries
); //更新适配器数据
loadDiaries
(); // 刷新日记列表
}
}
@SuppressLint
("NotifyDataSetChanged"
)
private void loadDiaries
() {
diaryList.clear
(); // 清空当前列表
diaryList.addAll
(dbHelper.getDiariesByUserId
(userId
)); // 从数据库重新获取数据
diaryAdapter.notifyDataSetChanged
(); // 通知适配器数据已更改
}
private void initView
() {
rv
DiaryList=findViewById
(R.id.rv
DiaryList
);
rv
DiaryList.setLayoutManager
(new LinearLayoutManager
(this
));
diaryList=new ArrayList<>
();
// 确保传递 userId 给
DiaryAdapter
diaryAdapter=new
DiaryAdapter
(this,
diaryList,userId
);
rv
DiaryList.setAdapter
(diaryAdapter
);
}
}RegisterActivity：package com.example.
diaryapp;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import androidx.activity.EdgeToEdge;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import com.example.
diaryapp.utils.DatabaseHelper;
public class RegisterActivity extends AppCompatActivity {
private EditText etUsername,etPassword,etConfirmPassword;
private Button btnRegister;
private DatabaseHelper dbHelper;
@Override
protected void onCreate
(Bundle savedInstanceState
) {
super.onCreate
(savedInstanceState
);
EdgeToEdge.enable
(this
);
setContentView
(R.layout.activity_register
);
// 初始化界面组件
initView
();
// 注册按钮监听
btnRegister=findViewById
(R.id.btnRegister
);
btnRegister.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
registerUser
();
}
}
);
// 返回登录按钮监听
Button btnBack=findViewById
(R.id.btnBack
);
btnBack.setOnClickListener
(new View.OnClickListener
() {
@Override
public void onClick
(View view
) {
Intent intent=new Intent
(RegisterActivity.this, LoginActivity.class
);
startActivity
(intent
);
}
}
);
}
private void registerUser
() {
String username=etUsername.getText
().toString
().trim
();
String password=etPassword.getText
().toString
().trim
();
String confirmPassword=etConfirmPassword.getText
().toString
().trim
();
// 验证输入
if
(username.isEmpty
() || password.isEmpty
() || confirmPassword.isEmpty
()){
Toast.makeText
(this, "所有字段不能为空", Toast.LENGTH_SHORT
).show
();
return;
}
if
(!password.equals
(confirmPassword
)){
Toast.makeText
(this, "两次输入的密码不一致", Toast.LENGTH_SHORT
).show
();
return;
}
// 检查用户名是否已被注册
if
(dbHelper.checkUser
(username,password
)){
Toast.makeText
(this, "该用户名已被注册", Toast.LENGTH_SHORT
).show
();
return;
}
// 注册新用户
long result=dbHelper.addUser
(username,password
);
if
(result > 0
){
Toast.makeText
(this, "注册成功", Toast.LENGTH_SHORT
).show
();
Intent intent=new Intent
(RegisterActivity.this,LoginActivity.class
);
startActivity
(intent
);
finish
();
}else {
Toast.makeText
(this, "注册失败", Toast.LENGTH_SHORT
).show
();
}
}
private void initView
() {
etUsername=findViewById
(R.id.etUsername
);
etPassword=findViewById
(R.id.etPassword
);
etConfirmPassword=findViewById
(R.id.etConfirmPassword
);
dbHelper=new DatabaseHelper
(this
);
}
}
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