android记事本--geolo无聊版

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/*

 *android记事本

 *geolo无聊版

 *QQ：303314679

 *  请注意：转载请注明出处，谢谢合作

*/

主界面                                                                                     主界面菜单

         

 

编辑界面                                                                                 编辑界面菜单

    

显示内容菜单

    

 

NotepadMain.java

package com.geolo.android;import android.app.Activity;import android.content.Intent;import android.graphics.Color;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.AdapterView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.Toast;public class NotepadMain extends Activity { /** Called when the activity is first created. */LinearLayout mLinearLayout;ListView mListView; DatabaseManage mDatabaseManage;private static long getId; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); createListView(); //构造DatabaseManage对象 mDatabaseManage = new DatabaseManage(this); //更新视图显示 UpdataView(); //为mListView视图添加setOnItemSelectedListener监听 mListView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){@Overridepublic void onItemSelected(AdapterView<?> parent, View view,int position, long id) {getId = id;}@Overridepublic void onNothingSelected(AdapterView<?> parent) {// 没有选中}}); //为mListView视图添加监听 mListView.setOnItemClickListener(new AdapterView.OnItemClickListener(){@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {// 对于选中的项进行处理//新建一个到查看界面的Intent对象 Intent intent = new Intent(); //新建一个传送参数的bundle对象 Bundle bundle = new Bundle(); //指定intent要启动的类 intent.setClass(NotepadMain.this, NotepadView.class); //把参数id放到bundle中传送 bundle.putLong("ID", id); //让intent携带这个bundle intent.putExtras(bundle); //启动一个新的Activity startActivity(intent); //清除bundle的参数bundle.clear(); //关闭当前的Activity NotepadMain.this.finish();}}); } //创建列表视图 public void createListView(){ //创建LinearLayout布局对象 mLinearLayout = new LinearLayout(this); //设置布局LinearLayout的属性 mLinearLayout.setOrientation(LinearLayout.VERTICAL); mLinearLayout.setBackgroundColor(android.graphics.Color.BLACK); //创建ListView对象 mListView = new ListView(this); LinearLayout.LayoutParams param = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); //设置列表的背景色 mListView.setBackgroundColor(Color.BLACK); //添加mListView到mLinearLayout布局 mLinearLayout.addView(mListView , param); //设置显示mLinearLayout布局 setContentView(mLinearLayout); } @Override public boolean onCreateOptionsMenu(Menu menu) { menu.add(0,0,0,"添加"); menu.add(0,1,1,"删除"); menu.add(0,2,2,"退出"); return super.onCreateOptionsMenu(menu); } //删除指定数据 public void deleteAssignData(){ try { if(getId != 0){ mDatabaseManage.DeleteData(getId); Toast.makeText(this, "删除成功", Toast.LENGTH_SHORT); UpdataView(); }else{ Toast.makeText(this, "删除失败", Toast.LENGTH_SHORT); UpdataView(); } } catch (Exception e) { Toast.makeText(this, "删除失败", Toast.LENGTH_SHORT); UpdataView(); e.printStackTrace(); } } //更新视图显示 public void UpdataView(){ mListView.setAdapter(mDatabaseManage.UpdataAdapter()); } @Override public boolean onOptionsItemSelected(MenuItem item){ //得到当前选中的MenuItem的ID int item_id = item.getItemId(); switch (item_id) { //添加菜单事件 case 0: //新建一个到编辑界面的Intent对象 Intent intent = new Intent(); //新建一个传送参数的bundle对象 Bundle bundle = new Bundle(); //把参数id放到bundle中传送 bundle.putString("mode", "main"); //让intent携带这个bundle intent.putExtras(bundle); //指定intent要启动的类 intent.setClass(NotepadMain.this, NotepadEditor.class); //启动一个新的Activity startActivity(intent); //关闭当前的Activity NotepadMain.this.finish(); break; //删除菜单事件 case 1: deleteAssignData(); break; //退出菜单事件 case 2: this.finish(); break; default: break; } return super.onOptionsItemSelected(item); }} 

NotepadEditor.java

package com.geolo.android;import java.util.Calendar;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class NotepadEditor extends Activity {TextView tvTitle;TextView tvText;private EditText etTitle;private EditText etText;private static String title;private static String text;private static String date ;DatabaseManage mDatabaseManage;private static long getId = 0;private static boolean isBundle = false; private static Bundle bundle;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(com.geolo.android.R.layout.editor);tvTitle = (TextView)findViewById(com.geolo.android.R.id.textview01);etTitle = (EditText)findViewById(com.geolo.android.R.id.edittitle);tvText = (TextView)findViewById(com.geolo.android.R.id.textview02);etText = (EditText)findViewById(com.geolo.android.R.id.edittext);//构造DatabaseManage对象mDatabaseManage = new DatabaseManage(this);//创建一个bundle接收NotepadMain来的参数bundle = this.getIntent().getExtras();if(bundle.getString("mode").equals("view")){if(bundle != null){getId = bundle.getLong("EditorId");//获取标题和文本的信息和IDetTitle.setText(bundle.getString("EditorTitle"));etText.setText(bundle.getString("EditorText"));isBundle = true;}}else if(bundle.getString("mode").equals("main")){if(bundle != null){isBundle = false;}}}//得到编辑框的数据和时间public void dataAndDate(){title = etTitle.getText().toString();text = etText.getText().toString();if(title.equals("")||text.equals("")){Toast.makeText(this, "不能保存空值", Toast.LENGTH_SHORT).show();}else{final Calendar c = Calendar.getInstance(); int mYear = c.get(Calendar.YEAR); //获取当前年份int mMonth = c.get(Calendar.MONTH);//获取当前月份int mDay = c.get(Calendar.DAY_OF_MONTH);//获取当前月份的日期号码int mHour = c.get(Calendar.HOUR_OF_DAY);//获取当前的小时数int mMinute = c.get(Calendar.MINUTE);//获取当前的分钟数 date = "事件日期" +String.valueOf(mYear) + "-" + String.valueOf(mMonth) + "-" +String.valueOf(mDay) +"事件时间" +String.valueOf(mHour) + ":" +String.valueOf(mMinute);Log.e("date", date);}}//判断文本是否写入了数据库private boolean isAdded() {dataAndDate();try {mDatabaseManage.AddData(title, date , text);return true;} catch (Exception e) {e.printStackTrace();return false;}}//判断文本是否修改成功private boolean isUpdata(){dataAndDate();try {mDatabaseManage.UpData(getId, title, date, text);return true;} catch (Exception e) {e.printStackTrace();return false;}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {menu.add(0,0,0,"保存");menu.add(0,1,1,"返回");return super.onCreateOptionsMenu(menu);}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {int item_Id = item.getItemId();switch (item_Id) {//保存菜单(文本保存后提示保存成功并进入查看这个文本的界面)case 0:long lookID;//判断是主界面还是显示界面发来的信息if(!isBundle){if(isAdded()){Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show();//得到最后一个数据的主键IDlookID = mDatabaseManage.curMoveToLast();}else{Toast.makeText(this, "保存失败", Toast.LENGTH_SHORT).show();break;}}else{if(isUpdata()){lookID = getId;Toast.makeText(this, "修改成功", Toast.LENGTH_SHORT).show();}else{Toast.makeText(this, "修改失败", Toast.LENGTH_SHORT).show();break;}}//新建一个事件查看的Intent的对象Intent intent = new Intent();//新建一个传送参数的bundle对象Bundle bundle = new Bundle(); //把参数id放到bundle中传送bundle.putLong("ID", lookID);//让intent携带这个bundleintent.putExtras(bundle);//指定intent要启动的类intent.setClass(NotepadEditor.this, NotepadView.class);//启动一个新的ActivitystartActivity(intent);//清除bundle的参数bundle.clear();//关闭当前的ActivityNotepadEditor.this.finish();break;//返回菜单case 1://新建一个主界面的Intent的对象Intent intent02 = new Intent();//指定intent要启动的类intent02.setClass(NotepadEditor.this, NotepadMain.class);//启动一个新的ActivitystartActivity(intent02);//关闭当前的ActivityNotepadEditor.this.finish();break;default:break;}return super.onOptionsItemSelected(item);}} 

NotepadView.java

package com.geolo.android;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.widget.TextView;public class NotepadView extends Activity{TextView tvTitle,tvText;private TextView titleView,textView;private static long getID;DatabaseManage mDatabaseManage;private static String getTitle,getText;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(com.geolo.android.R.layout.noteview);tvTitle = (TextView)findViewById(com.geolo.android.R.id.title01);titleView = (TextView)findViewById(com.geolo.android.R.id.titleview);tvText = (TextView)findViewById(com.geolo.android.R.id.context02);textView = (TextView)findViewById(com.geolo.android.R.id.textview);//构造DatabaseManage对象来操作数据库mDatabaseManage = new DatabaseManage(this);//创建一个bundle接收NotepadMain来的参数Bundle bundle = this.getIntent().getExtras();if(bundle.getLong("ID") != 0){getID = bundle.getLong("ID");gainData(getID);}else{Log.e("bundle", "bundle bundle bundle");}} //根据得到的ID增加数据public void gainData(long id){List<String> list = new ArrayList<String>();list = mDatabaseManage.UpdataText(id);getTitle = list.get(0);getText = list.get(1);titleView.setText(getTitle);textView.setText(getText);}@Overridepublic boolean onCreateOptionsMenu(Menu menu){menu.add(0,0,0,"修改");menu.add(0,1,1,"返回");return super.onCreateOptionsMenu(menu);}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {int item_Id = item.getItemId();switch (item_Id) {//修改菜单(到编辑界面并把原有的数据（文本）传送到编辑界面)case 0://新建一个到编辑界面的Intent对象 Intent intent01 = new Intent(); //新建一个传送参数的bundle对象 Bundle bundle = new Bundle(); //把模式放到bundle中传送 bundle.putString("mode", "view"); //把参数id放到bundle中传送 bundle.putLong("EditorId", getID); //把事件标题放到bundle中传送 bundle.putString("EditorTitle", getTitle); //把事件内容放到bundle中传送 bundle.putString("EditorText", getText); //让intent携带这个bundle intent01.putExtras(bundle); //指定intent要启动的类 intent01.setClass(NotepadView.this, NotepadEditor.class); //启动一个新的Activity startActivity(intent01); //关闭当前的Activity NotepadView.this.finish();break;//返回菜单case 1://新建一个主界面的Intent的对象Intent intent02 = new Intent();//指定intent要启动的类intent02.setClass(NotepadView.this, NotepadMain.class);//启动一个新的ActivitystartActivity(intent02);//关闭当前的ActivityNotepadView.this.finish();break;default:break;}return super.onOptionsItemSelected(item);}} 

DatabaseManage.java

package com.geolo.android;import java.util.ArrayList;import java.util.List;import android.content.Context;import android.database.Cursor;import android.widget.ListAdapter;import android.widget.SimpleCursorAdapter;public class DatabaseManage {public static long id;public static String title, date, text;DatabaseMethod mDatabaseMethod;private Context mContext;public DatabaseManage(Context context){mContext = context;//构造DatabaseMethod对象mDatabaseMethod = new DatabaseMethod(mContext);//取得数据库对象mDatabaseMethod.open();}//更新一条数据public void UpData(long ida, String titlea, String datea, String texta){mDatabaseMethod.updateData(ida, titlea, datea, texta);}//向表中添加一条数据public void AddData(String mTitle, String mDate, String mText){mDatabaseMethod.insertData(mTitle, mDate, mText);}//向表中删除指定的一条数据public void DeleteData(long rowId){//删除数据mDatabaseMethod.deleteData(rowId);}public long allIdCount(){Cursor cur = mDatabaseMethod.fetchAllData();long l = cur.getCount();return l;}//把cursor移动到最后一个数据，得到最后一个数据的idpublic long curMoveToLast(){Cursor cur = mDatabaseMethod.fetchAllData();if(cur != null){if(cur.moveToLast()){int lastIdColumn = cur.getColumnIndex("_id");int lastId = cur.getInt(lastIdColumn);return lastId;}}return 0;}//给主界面用来更新的视图列表(事件标题和事件日期)public ListAdapter UpdataAdapter(){//获取数据库note的cursorCursor cur = mDatabaseMethod.fetchAllData();if(cur != null && cur.getCount() >= 0 ){//ListAdapter是ListView和后台数据的桥梁ListAdapter adapter = new SimpleCursorAdapter(mContext, //表示每一行包含两个数据项android.R.layout.simple_list_item_2,//数据库的cursor对象cur, //从数据库的table_title和table_date两列中取得数据new String[]{DatabaseMethod.KEY_TITLE , DatabaseMethod.KEY_DATE}, //与title和date对应的Viewsnew int[]{android.R.id.text1 , android.R.id.text2});//取得数据成功返回ListAdapter对象return adapter;}//取得数据失败返回空值。return null;}//给显示界面用来更新的指定数据（事件标题和事件内容）public List<String> UpdataText(long rowId){List<String> list = new ArrayList<String>();//获取数据库的cursorCursor cur = mDatabaseMethod.fetchAllTitleAndText(rowId);if(cur != null && cur.getCount() >= 0 ){title = cur.getString(cur.getColumnIndex("_title"));text = cur.getString(cur.getColumnIndex("_text"));list.add(title);list.add(text);//取得数据成功返回List对象return list;}//取得数据失败返回空值return null;}} 

DatabaseMethod.java

package com.geolo.android;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.SQLException;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;public class DatabaseMethod {//用于打印log//private static final String TAG = "DatabaseMethod";//表中一条事件的idpublic static final String KEY_ID = "_id";//表中一条事件的标题public static final String KEY_TITLE = "_title";//表中一条事件的创建日期和时间等public static final String KEY_DATE = "_date";//表中一条事件的内容public static final String KEY_TEXT = "_text";//数据库的名称为GeoloNotepad.dbprivate static final String DB_NAME = "GeoloNotepad.db";//数据库表名private static final String DB_TABLE ="Notepad";//数据库的版本private static final int DB_VERSIOIN = 1;//本地context对象private Context mContext = null;//创建一个事件表的sql语句private static final String DB_CREATE = "CREATE TABLE " + DB_TABLE + " (" + KEY_ID + " INTEGER PRIMARY KEY," + KEY_TITLE + " TEXT," + KEY_DATE + " DATE," + KEY_TEXT + " TEXT)";//执行open()打开数据库时，保存返回的数据库对象private SQLiteDatabase mSQLiteDatabase = null;//由SQLiteOpenHelper继承过来private DatabaseHelper mDatabaseHelper = null;//构建DatabaseHelper类private static class DatabaseHelper extends SQLiteOpenHelper{/*构造函数-创建一个数据库*/public DatabaseHelper(Context context) {/*当调用getWritableDatabase()或getReadableDatabase()方法时则创建一个数据库*/super(context, DB_NAME, null, DB_VERSIOIN);}//创建一个表@Overridepublic void onCreate(SQLiteDatabase db) {// 数据库没有表时创建一个db.execSQL(DB_CREATE);}//升级数据库@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {db.execSQL("DROP TABLE IF EXISTS notes");onCreate(db);}}//构造函数-取得contextpublic DatabaseMethod(Context context){mContext = context;}//打开数据库，返回数据库对象public void open() throws SQLException{mDatabaseHelper = new DatabaseHelper(mContext);mSQLiteDatabase = mDatabaseHelper.getWritableDatabase();}//关闭数据库public void close(){mDatabaseHelper.close();}//插入一条数据public long insertData(String _title, String _date, String _text){ContentValues initialValues = new ContentValues();initialValues.put(KEY_TITLE, _title);initialValues.put(KEY_DATE, _date);initialValues.put(KEY_TEXT, _text);return mSQLiteDatabase.insert(DB_TABLE, KEY_ID, initialValues);}//删除一条数据public boolean deleteData(long rowId){return mSQLiteDatabase.delete(DB_TABLE, KEY_ID + "=" + rowId, null)>0;}//通过cursor查询所有数据public Cursor fetchAllData(){return mSQLiteDatabase.query(DB_TABLE, new String[]{KEY_ID,KEY_TITLE,KEY_DATE,KEY_TEXT}, null, null, null, null, null);}//查询指定 事件标题和时间的数据（用在主界面）public Cursor fetchAllTitleAndDate(long rowId) throws SQLException{Cursor mCursor = mSQLiteDatabase.query(true, DB_TABLE, new String[]{KEY_ID,KEY_TITLE,KEY_DATE,KEY_TEXT}, KEY_ID + "=" + rowId, null, null, null, null, null);if(mCursor != null){mCursor.moveToFirst();}return mCursor;}//查询指定事件 标题和内容的数据(用在事件查看界面)public Cursor fetchAllTitleAndText(long rowId) throws SQLException{Cursor mCursor = mSQLiteDatabase.query(true, DB_TABLE, new String[]{KEY_ID,KEY_TITLE,KEY_DATE,KEY_TEXT}, KEY_ID + "=" + rowId, null, null, null, null, null);if(mCursor != null){mCursor.moveToFirst();}return mCursor;}//更新一条数据public boolean updateData(long rowId, String _title, String _date, String _text){ContentValues args = new ContentValues();args.put(KEY_TITLE, _title);args.put(KEY_DATE, _date);args.put(KEY_TEXT, _text);return mSQLiteDatabase.update(DB_TABLE, args, KEY_ID + "=" + rowId, null) > 0;}} 

 

很辛苦看完了吧，源码下载地址http://download.csdn.net/source/2241357