简单记事本app4

——新增便签——

activity_note_add.xml　　界面设计

<?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"
      android:padding="10dp"
      android:background="@color/yellow"
      tools:context=".MainActivity">

<TextView
        android:layout_width="match_parent"
            android:layout_height="50dp"
            android:text="OvO"
            android:textColor="@color/orange"
            android:textSize="35sp"
            android:gravity="center"
            android:layout_marginTop="100dp"/>

<LinearLayout
        android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_marginTop="70dp">
<EditText
            android:id="@+id/an_et_title"
               android:layout_width="match_parent"
               android:layout_height="50dp"
               android:textSize="16sp"
               android:textColor="@color/black"
               android:hint="  标题"
               android:maxLines="1"
               android:background="@drawable/bg_frame"
               />
<EditText
            android:id="@+id/an_et_keywords"
               android:layout_width="match_parent"
               android:layout_height="50dp"
               android:textSize="16dp"
               android:textColor="@color/black"
               android:hint="  关键字"
               android:layout_marginTop="5dp"
               android:maxLines="1"
               android:background="@drawable/bg_frame"
               />
<EditText
            android:id="@+id/an_et_contents"
               android:layout_width="match_parent"
               android:layout_height="50dp"
               android:textSize="16dp"
               android:textColor="@color/black"
               android:hint="  内容"
               android:layout_marginTop="5dp"
               android:maxLines="1"
               android:background="@drawable/bg_frame"
               />
</LinearLayout>

<Button
        android:id="@+id/an_addnote_btn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="添加事件"
            android:textColor="@color/black"
            android:background="@drawable/bg_frame"
            android:layout_marginLeft="2dp"
            android:layout_marginTop="50dp"
            />

</LinearLayout>

Note Add Activity.Java

package com.example.text002;

import static db.DBManager.insertNote;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class NoteAddActivity extends AppCompatActivity implements View.OnClickListener {

   private Button an_addnote_btn;
   private EditText an_et_title, an_et_keywords, an_et_contents, an_et_daytime;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_note_add);
      initfun();
   }

   private void initfun() {
      an_et_title = findViewById(R.id.an_et_title);
      an_et_keywords = findViewById(R.id.an_et_keywords);
      an_et_contents = findViewById(R.id.an_et_contents);
      //an_et_daytime = findViewById(R.id.an_et_daytime);

      an_addnote_btn = findViewById(R.id.an_addnote_btn);
      an_addnote_btn.setOnClickListener(NoteAddActivity.this);
   }

   @Override
   public void onClick(View view) {
      int vid = view.getId();
      if(vid == R.id.an_addnote_btn){
         //注册
         String unan_et_title = an_et_title.getText().toString();
         String unan_et_keywords = an_et_keywords.getText().toString();
         String unan_et_contents = an_et_contents.getText().toString();
         //String unan_et_daytime = an_et_daytime.getText().toString();
         //title,keywords,contents,daytime
         unan_et_title = isnull(unan_et_title);
         unan_et_contents = isnull(unan_et_contents);
         //unan_et_daytime = isnull(unan_et_daytime);
         Boolean flag = insertNote(unan_et_title, unan_et_keywords, unan_et_contents);//, unan_et_daytime);
         if(flag){
            Toast.makeText(this,"事件添加成功OvO",Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(NoteAddActivity.this,FunctionActivity.class);
            startActivity(intent);
         } else {
            Toast.makeText(this,"事件添加失败TAT",Toast.LENGTH_SHORT).show();
         }
      }
   }

   private String isnull(String str) {
      if(str.length() == 0 || str == null){
         str = " ";
      }
      return str;
   }
}