Android 记事本NotePad,flutter安装包优化

// Create table

@Override

public void onCreate(SQLiteDatabase db) {

String createNoteTableSql = “CREATE TABLE " + NOTE_TABLE_NAME + " (”

  • NOTE_COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + NOTE_COL_TITLE

  • " TEXT," + NOTE_COL_CONTENT + " TEXT," + NOTE_COL_CREATED

  • " INTEGER," + NOTE_COL_MODIFIED + " INTEGER" + “);”;

db.execSQL(createNoteTableSql);

}

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

// Drop older table if existed

db.execSQL("DROP TABLE IF EXISTS " + NOTE_TABLE_NAME);

// Create tables again

onCreate(db);

}

// Add new note

public int addNote(Note note) {

SQLiteDatabase db = this.getWritableDatabase();

ContentValues values = new ContentValues();

values.put(NOTE_COL_TITLE, note.getTitle());

values.put(NOTE_COL_CONTENT, note.getContent());

values.put(NOTE_COL_CREATED, note.getCreated());

values.put(NOTE_COL_MODIFIED, note.getModified());

// Insert to database

long rowId = db.insert(NOTE_TABLE_NAME, null, values);

// Close the database

db.close();

return (int) rowId;

}

// Get one note

public Note getNote(int id) {

SQLiteDatabase db = this.getReadableDatabase();

Cursor cursor = db.query(NOTE_TABLE_NAME, NOTE_COL_PROJECTION,

NOTE_COL_ID + “=?”, new String[] { String.valueOf(id) }, null,

null, null, null);

if (cursor != null)

cursor.moveToFirst();

Note note = new Note(cursor.getInt(0), cursor.getString(1),

cursor.getString(2), cursor.getLong(3), cursor.getLong(4));

return note;

}

// Get all notes

public List getAllNotes() {

List noteList = new ArrayList();

String selectQuery = "SELECT * FROM " + NOTE_TABLE_NAME;

SQLiteDatabase db = this.getWritableDatabase();

Cursor cursor = db.rawQuery(selectQuery, null);

// looping through all rows and adding to list

if (cursor.moveToFirst()) {

do {

Note note = new Note(cursor.getInt(0), cursor.getString(1),

cursor.getString(2), cursor.getLong(3),

cursor.getLong(4));

noteList.add(note);

} while (cursor.moveToNext());

}

// return contact list

return noteList;

}

public Cursor getAllNotesCursor() {

String selectQuery = "SELECT * FROM " + NOTE_TABLE_NAME;

SQLiteDatabase db = this.getReadableDatabase();

Cursor cursor = db.rawQuery(selectQuery, null);

return cursor;

}

public int updateNote(Note note) {

SQLiteDatabase db = this.getWritableDatabase();

ContentValues values = new ContentValues();

values.put(NOTE_COL_TITLE, note.getTitle());

values.put(NOTE_COL_CONTENT, note.getContent());

values.put(NOTE_COL_CREATED, note.getCreated());

values.put(NOTE_COL_MODIFIED, note.getModified());

return db.update(NOTE_TABLE_NAME, values,

NOTE_COL_ID + “=?”, new String[] { String.valueOf(note.getId()) });

}

public void deleteNote(int noteId) {

SQLiteDatabase db = this.getWritableDatabase();

db.delete(NOTE_TABLE_NAME, NOTE_COL_ID + “=?”,new String[] { String.valueOf(noteId) } );

db.close();

}

public void deleteAllNotes() {

SQLiteDatabase db = this.getWritableDatabase();

db.delete(NOTE_TABLE_NAME, null, null);

db.close();

}

}

新建和修改便签:

package com.zms.notepad;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

/**

  • Created by AlexZhou on 2015/2/3.

  • 11:14

*/

public class NoteNew extends Activity {

private EditText etTitle; //便签标题

private EditText etContent; //便签内容

private Button btnCancel;

private Button btnSave;

private int _noteId; //便签ID

private NoteDbHelper _db;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.note_new);

etTitle = (EditText) findViewById(R.id.etTitle);

etContent = (EditText) findViewById(R.id.etContent);

btnCancel = (Button) findViewById(R.id.btnCancel);

btnSave = (Button) findViewById(R.id.btnSave);

btnCancel.setOnClickListener(new OnClickListenerImp());

btnSave.setOnClickListener(new OnClickL

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istenerImp());

_db = new NoteDbHelper(this);

Intent intent = getIntent();

_noteId = intent.getIntExtra(NoteList.EXTRA_NOTE_ID, -1);

if (_noteId > 0) {

Note note = _db.getNote(_noteId);

etTitle.setText(note.getTitle());

etContent.setText(note.getContent());

}

}

private class OnClickListenerImp implements View.OnClickListener {

@Override

public void onClick(View v) {

if (v == btnCancel) {

Toast.makeText(NoteNew.this, “天启提示:放弃新建便签”, Toast.LENGTH_SHORT).show();

finish();

} else if (v == btnSave) {

String titleVoid = etTitle.getText().toString();

String contentVoid = etContent.getText().toString();

if (titleVoid.equals("") || contentVoid.equals("")) {

Toast.makeText(NoteNew.this, “天启提示:标题或内容为空”, Toast.LENGTH_SHORT).show();

} else {

ToDatabase(); //插入数据库

Toast.makeText(NoteNew.this, “天启提示:便签保存成功”, Toast.LENGTH_SHORT).show();

finish();

}

}

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.note_new_menu, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

int id = item.getItemId();

if (id == R.id.action_exit) {

Intent intent = new Intent(Intent.ACTION_MAIN);

intent.addCategory(Intent.CATEGORY_HOME);

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

startActivity(intent);

android.os.Process.killProcess(android.os.Process.myPid());

return true;

} else if (id == R.id.action_about) {

Intent intent = new Intent(this, About.class);

startActivity(intent);

return true;

}

return super.onOptionsItemSelected(item);

}

public final int ToDatabase() {

String title = etTitle.getText().toString();

String content = etContent.getText().toString();

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