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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