upload

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

app/.gitignore

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+/build

app/build.gradle.kts

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+plugins {
+    id("com.android.application")
+}
+
+android {
+    namespace = "com.example.todo"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.example.todo"
+        minSdk = 24
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation("androidx.appcompat:appcompat:1.6.1")
+    implementation("com.google.android.material:material:1.9.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/example/todo/ExampleInstrumentedTest.java

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+package com.example.todo;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.example.myapplication8", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.MyApplication8"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+
+</manifest>

app/src/main/java/com/example/todo/ListPersistence.java

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+package com.example.todo;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+
+public class ListPersistence {
+    public ListPersistence() {
+    }
+
+    public  void serializeList(ArrayList<String> list, String fileName) {
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(fileName))) {
+            oos.writeObject(list);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+    public  ArrayList<String> deserializeList(String fileName) {
+        ArrayList<String> list = new ArrayList<>();
+        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(fileName))) {
+            list = (ArrayList<String>) ois.readObject();
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+        return list;
+    }
+}

app/src/main/java/com/example/todo/MainActivity.java

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+package com.example.todo;
+
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.os.Handler;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ListView;
+import android.widget.ArrayAdapter;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Calendar;
+
+public class MainActivity extends AppCompatActivity {
+
+    private EditText todoEditText;
+    private Button addButton;
+    private ListView todoListView;
+    private ArrayList<String> todoList = new ArrayList<>();
+    private ArrayAdapter<String> todoAdapter;
+
+    private ListPersistence listPersistence = new ListPersistence();
+    private String TAG;
+    private String path;
+    private TextView leastMonth;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+
+
+        todoEditText = findViewById(R.id.todoEditText);
+        addButton = findViewById(R.id.addButton);
+        todoListView = findViewById(R.id.todoListView);
+
+
+        todoAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, todoList);
+        todoListView.setAdapter(todoAdapter);
+
+
+
+        System.out.println("启动");
+        String fileName = "list.ser";
+        // 内部存储私有空间
+        String directory = getFilesDir().toString();
+        path = directory + File.separatorChar + fileName;
+        //
+        System.out.println(path);
+        ArrayList<String> todo_from_file = listPersistence.deserializeList(path);
+        for (String item :
+                todo_from_file) {
+            todoList.add(item);
+            //
+            System.out.println(item);
+        }
+        todoAdapter.notifyDataSetChanged();
+
+
+        addButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                String todo = todoEditText.getText().toString();
+                todo=todo.trim().replaceAll("(\r\n|\r|\n)$", "");
+                if (todo.trim().isEmpty()) {
+                    todoEditText.setText("");
+                } else if (!todo.isEmpty()) {
+                    todoList.add(todo);
+                    listPersistence.serializeList(todoList, path);
+                    todoAdapter.notifyDataSetChanged();
+                    todoEditText.setText("");
+                }
+
+            }
+        });
+
+
+       todoListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
+           @Override
+           public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
+               // 在长按事件发生时执行删除操作
+               String selectedItem = (String) parent.getItemAtPosition(position);
+               todoList.remove(selectedItem);
+               todoAdapter.notifyDataSetChanged();
+               return true;
+           }
+       });
+
+    }
+
+}