Android 记事本NotePad
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起初接触Android的时候用Eclipse写的小应用，后面手动移植到了Android Studio中，可以新建，查看，删除便签等，今天整理一下代码，完整的代码可以在我的GitHub上看到，链接在文末。
DbHelper：
package com.zms.notepad;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import java.util.ArrayList;import java.util.List;/** * Created by AlexZhou on 2015/2/3. * 11:12 */public class NoteDbHelper extends SQLiteOpenHelper { private static final int DATABASE_VERSION = 2; private static final String DATABASE_NAME = "notes_db"; private static final String NOTE_TABLE_NAME = "note"; private static final String NOTE_COL_ID = "_id"; private static final String NOTE_COL_TITLE = "title"; private static final String NOTE_COL_CONTENT = "content"; private static final String NOTE_COL_CREATED = "created"; private static final String NOTE_COL_MODIFIED = "modified"; private static final String[] NOTE_COL_PROJECTION = new String[] { NOTE_COL_ID, NOTE_COL_TITLE, NOTE_COL_CONTENT, NOTE_COL_CREATED, NOTE_COL_MODIFIED }; public NoteDbHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } // 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<Note> getAllNotes() { List<Note> noteList = new ArrayList<Note>(); 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 OnClickListenerImp()); _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(); int newNoteId = -1; if (_noteId > 0) { Note note = _db.getNote(_noteId); note.setTitle(title); note.setContent(content); note.setModified(Long.valueOf(System.currentTimeMillis())); _db.updateNote(note); } else { Note newNote = new Note(title, content); newNoteId = _db.addNote(newNote); } return newNoteId; }}查看便签：
package com.zms.notepad;import android.content.Intent;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.ImageView;public class Main extends ActionBarActivity { private ImageView ivLogo; private Button btnView; private Button btnNew; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ivLogo = (ImageView) findViewById(R.id.ivLogo); btnView = (Button) findViewById(R.id.btnView); btnNew = (Button) findViewById(R.id.btnNew); btnView.setOnClickListener(new OnClickListenerImp()); btnNew.setOnClickListener(new OnClickListenerImp()); ivLogo.setAlpha(50); //Alpha 0-255,设置主页Logo的透明度 } private class OnClickListenerImp implements View.OnClickListener { @Override public void onClick(View v) { if (v == btnView) { Intent intent = new Intent(Main.this, NoteList.class); startActivity(intent); } else if (v == btnNew) { Intent intent = new Intent(Main.this, NoteNew.class); startActivity(intent); } } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_about) { //点击菜单兰“关于”按钮后触发 Intent intent = new Intent(this, About.class); startActivity(intent); return true; } else if (id == R.id.action_exit) { //点击菜单兰“退出”按钮后触发 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; } return super.onOptionsItemSelected(item); }}转载请注明出处：周木水的CSDN博客 http://blog.csdn.net/zhoumushui
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