修复了一些问题

src/showme/app/src/main/AndroidManifest.xml

@@ -18,6 +18,7 @@
         <activity android:name=".diary.ui.UpdateDiaryActivity" />
         <activity android:name=".diary.ui.DiaryActivity" />
         <activity android:name=".diary.ui.AddDiaryActivity" />
+        <activity android:name=".diary.ui.CardActivity" />
         <activity android:name=".diary.ui.QuestionActivity"/>
         <activity android:name=".Course.AddCourseActivity" />
         <activity android:name=".Course.CourseActivity" />

src/showme/app/src/main/java/com/diary/showme/diary/ui/CardActivity.java

@@ -0,0 +1,65 @@
+package com.diary.showme.diary.ui;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.content.Context;
+import android.graphics.Color;
+import android.os.Environment;
+import android.widget.EditText;
+import android.widget.Toast;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.diary.showme.Course.AddCourseActivity;
+import com.diary.showme.Course.Course;
+import com.diary.showme.Course.CourseActivity;
+import com.diary.showme.R;
+
+
+public class CardActivity extends AppCompatActivity {
+
+    private Button card1;
+
+    private Button card2;
+
+    private Button card3;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.card);
+
+        card1 = findViewById(R.id.card1);
+        card2 = findViewById(R.id.card2);
+        card3 = findViewById(R.id.card3);
+        card1.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                startActivityForResult(new Intent(CardActivity.this, AddDiaryActivity.class), 0);
+            }
+        });
+        card2.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                startActivityForResult(new Intent(CardActivity.this, AddDiaryActivity.class), 0);
+            }
+        });
+        card3.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                startActivityForResult(new Intent(CardActivity.this, AddDiaryActivity.class), 0);
+            }
+        });
+    }
+
+    public static void startActivity(Context context) {
+        Intent intent = new Intent(context, CardActivity.class);
+        context.startActivity(intent);
+    }
+
+
+}

src/showme/app/src/main/java/com/diary/showme/diary/ui/DiaryActivity.java

@@ -8,6 +8,7 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 import android.Manifest;
+import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -15,6 +16,7 @@ import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.graphics.Color;
 import android.media.MediaPlayer;
+import android.net.Uri;
 import android.os.Bundle;
 import android.os.Environment;
 import android.view.View;
@@ -24,6 +26,8 @@ import android.widget.RelativeLayout;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.diary.showme.Course.AddCourseActivity;
+import com.diary.showme.Course.CourseActivity;
 import com.diary.showme.diary.bean.DiaryBean;
 import com.diary.showme.diary.db.DiaryDatabaseHelper;
 import com.diary.showme.diary.event.StartUpdateDiaryEvent;
@@ -90,6 +94,10 @@ public class DiaryActivity extends AppCompatActivity implements View.OnClickList
 
     private MediaPlayer mediaPlayer = new MediaPlayer();
 
+    private DiaryAdapter adapter;
+
+    private Integer i = 0;
+
     /**
      * 标识今天是否已经写了日记
      */
@@ -178,10 +186,13 @@ public class DiaryActivity extends AppCompatActivity implements View.OnClickList
 
     private void initMediaPlayer() {
         try {
-            File file = new File(Environment.getExternalStorageDirectory(), "music.mp3");
-            mediaPlayer.setDataSource(file.getPath());//指定音频文件路径
+            Integer num_of_raw = 2;//歌曲的总数目
+            Uri uri=Uri.parse("android.resource://"+getPackageName()+"/raw/"+"music"+i);
+            mediaPlayer.reset();//重置音乐播放器
+            //加载多媒体文件
+            mediaPlayer=MediaPlayer.create(getApplicationContext(),uri);
             mediaPlayer.setLooping(true);//设置为循环播放
-            mediaPlayer.prepare();//初始化播放器MediaPlayer
+            i = (i+1) % num_of_raw;
 
         } catch (Exception e) {
             e.printStackTrace();
@@ -190,11 +201,12 @@ public class DiaryActivity extends AppCompatActivity implements View.OnClickList
 
     @Override
     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
-        switch (requestCode){
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        switch (requestCode) {
             case 1:
-                if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
+                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     initMediaPlayer();
-                }else{
+                } else {
                     Toast.makeText(this, "拒绝权限，将无法使用程序。", Toast.LENGTH_LONG).show();
                     finish();
                 }
@@ -227,7 +239,8 @@ public class DiaryActivity extends AppCompatActivity implements View.OnClickList
                 }
                 break;
             case R.id.main_fab_enter_edit:
-                AddDiaryActivity.startActivity(this);
+                Intent intent = new Intent(DiaryActivity.this, CardActivity.class);
+                startActivity(intent);
                 break;
         }
     }

src/showme/app/src/main/res/layout/card.xml

@@ -0,0 +1,47 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    >
+
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical">
+
+        <Button
+            android:id="@+id/card1"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:background="#A4CF2626"
+            android:text="今天有遇到什么开心的事情吗？"
+            />
+
+        <Button
+            android:id="@+id/card2"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:background="#77CFAE34"
+            android:text="今天天气如何？"
+            />
+
+        <Button
+        android:id="@+id/card3"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:background="#8A6ECA34"
+        android:text="今天有没有做一件有意义的事？"
+        />
+
+
+
+    </LinearLayout>
+
+
+</LinearLayout>