目录结构：
package com.dc.app;import java.text.DecimalFormat;import java.util.Locale;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.content.DialogInterface;import android.content.Intent;import android.content.SharedPreferences;import android.content.res.Configuration;import android.content.res.Resources;import android.net.Uri;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.view.ContextMenu.ContextMenuInfo;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class App extends Activity { private static final String TAG="App"; /** Called when the activity is first created. */ private EditText height,weight; private Button submit,nextpage,locale,toList; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);// requestWindowFeature(Window.FEATURE_NO_TITLE);// this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, // WindowManager.LayoutParams.FLAG_FULLSCREEN); // this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); setContentView(R.layout.main); DisplayMetrics dm=new DisplayMetrics(); this.getWindowManager().getDefaultDisplay().getMetrics(dm); int screenWidth=dm.widthPixels; int screenHeight=dm.heightPixels; Toast.makeText(this, screenWidth+"*"+screenHeight, Toast.LENGTH_LONG).show();//320*480 height=(EditText)this.findViewById(R.id.height); weight=(EditText)this.findViewById(R.id.weight); submit=(Button)this.findViewById(R.id.submit); submit.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String s_h=height.getText().toString(); String s_w=weight.getText().toString(); if(s_h.equals("")||s_w.equals("")){ Toast.makeText(App.this, R.string.error, Toast.LENGTH_LONG).show(); return; } double h=Double.parseDouble(s_h)/100; double w=Double.parseDouble(s_w); double bmi=w/(h*h); Toast.makeText(App.this, getText(R.string.result).toString()+new DecimalFormat("0.00").format(bmi), Toast.LENGTH_LONG).show(); if(bmi>25){ showNotify("减肥通知", "您应该减肥啦！"); }else if(bmi<20){ showNotify("增肥计划", "您应该多吃点！"); }else{ showNotify("好身材", "您应该保持您的身材！"); } } }); nextpage=(Button)findViewById(R.id.nextpage); nextpage.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent=new Intent(); intent.setClass(App.this, Report.class); Bundle bundle=new Bundle(); bundle.putString("key_height", height.getText().toString()); bundle.putString("key_weight", weight.getText().toString()); intent.putExtras(bundle);//附加物，为意图追加额外的数据 startActivity(intent); } }); locale=(Button)findViewById(R.id.locale); locale.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Resources res=getResources(); Configuration config=res.getConfiguration(); if(config.locale==Locale.SIMPLIFIED_CHINESE){ config.locale=Locale.ENGLISH; }else{ config.locale=Locale.SIMPLIFIED_CHINESE; } DisplayMetrics dm=res.getDisplayMetrics(); res.updateConfiguration(config, dm); } }); toList=(Button)findViewById(R.id.toList); toList.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent = new Intent(); intent.setClass(App.this, DummyNote.class); startActivity(intent); } }); } private void showNotify(String title,String content){ Notification notice=new Notification(); notice.icon=android.R.drawable.stat_sys_warning; notice.tickerText=getText(R.string.label); notice.when=10L; notice.defaults=Notification.DEFAULT_SOUND; notice.setLatestEventInfo(this, title,content, PendingIntent.getActivity(this, 0, null, 0)); NotificationManager manager=(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE); manager.notify(0,notice); } @Override public boolean onContextItemSelected(MenuItem item) { // TODO Auto-generated method stub return super.onContextItemSelected(item); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { // TODO Auto-generated method stub super.onCreateContextMenu(menu, v, menuInfo); } private static final int DIALOG_ABOUT = 1; @Override protected Dialog onCreateDialog(int id) { // TODO Auto-generated method stub switch (id) { case DIALOG_ABOUT: Dialog loginDialog=new AlertDialog.Builder(this) .setTitle("BMI") .setMessage(R.string.label2) .setCancelable(true) .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub dialog.cancel(); } }) .setNegativeButton(R.string.homepage, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub dialog.cancel(); Uri uri=Uri.parse(getString(R.string.uri)); Intent intent=new Intent(Intent.ACTION_VIEW,uri); startActivity(intent); } }) .create(); loginDialog.setCanceledOnTouchOutside(true); return loginDialog; default: break; } return super.onCreateDialog(id); } public static final int menu_id_about=1; public static final int menu_id_exit=2; @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub menu.add(0, menu_id_about, 0, R.string.about).setShortcut('1', 'a');//设置快捷键 menu.add(0, menu_id_exit, 0, R.string.exit).setShortcut('2', 'e');//设置快捷键 return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case menu_id_about: showDialog(DIALOG_ABOUT); break; case menu_id_exit: save(); this.finish(); break; default: break; } return super.onOptionsItemSelected(item); } @Override public boolean onPrepareOptionsMenu(Menu menu) { // TODO Auto-generated method stub menu.findItem(menu_id_about).setVisible(true).setIcon(android.R.drawable.ic_menu_info_details); menu.findItem(menu_id_exit).setVisible(true).setIcon(android.R.drawable.ic_menu_close_clear_cancel); return super.onPrepareOptionsMenu(menu); } private void save(){ SharedPreferences setting=this.getPreferences(Activity.MODE_PRIVATE); setting.edit().putString("HEIGHT", height.getText().toString()) .putString("WEIGHT", weight.getText().toString()) .commit(); } private void read(){ SharedPreferences setting=this.getPreferences(Activity.MODE_PRIVATE); height.setText(setting.getString("HEIGHT", "")); weight.setText(setting.getString("WEIGHT", "")); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); save(); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); read(); } }package com.dc.helper;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;public class DatabaseHelper extends SQLiteOpenHelper { public static final String databaseName="bmi.db"; public static final String tableName="notes"; public static final int databaseVersion=1; public static final String field0="_id"; public static final String field1="note"; public static final String field2="created"; //创建或打开数据库 public DatabaseHelper(Context context) { super(context, databaseName, null, databaseVersion); // TODO Auto-generated constructor stub } //当数据库被创建时触发创建表 @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub String sql="create table "+tableName+"("+field0+" INTEGER PRIMARY KEY,"+field1+" TEXT,"+field2+" INTEGER);"; db.execSQL(sql); }//升级数据库时触发 @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub String sql="DROP TABLE IF EXISTS "+tableName; db.execSQL(sql); onCreate(db); } }package com.dc.adaper;import java.text.SimpleDateFormat;import java.util.Date;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import com.dc.helper.DatabaseHelper;public class DatabaseAdaper { Context content; DatabaseHelper helper; SQLiteDatabase db; public DatabaseAdaper(Context content){ this.content=content; open(); } public void open(){ helper=new DatabaseHelper(content);//创建或打开数据库 db=helper.getWritableDatabase();//真正创建 } public void close(){ db.close(); } public Cursor list(){// return db.rawQuery("SELECT * FROM "+DatabaseHelper.tableName, null); return db.query(DatabaseHelper.tableName, new String[]{DatabaseHelper.field0,DatabaseHelper.field1,DatabaseHelper.field2}, null, null, null, null, null); } public long insert(String note){ Date now=new Date(); SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); ContentValues values=new ContentValues(); values.put(DatabaseHelper.field1, note); values.put(DatabaseHelper.field2, sdf.format(now)); return db.insert(DatabaseHelper.tableName, null, values); } public boolean delete(long id){ return db.delete(DatabaseHelper.tableName, DatabaseHelper.field0+"="+id, null)>0; } public Cursor get(long id){ Cursor cursor=db.query(DatabaseHelper.tableName, new String[]{DatabaseHelper.field0,DatabaseHelper.field1,DatabaseHelper.field2}, DatabaseHelper.field0+"="+id, null, null, null, null); if(cursor!=null){ cursor.moveToFirst(); } return cursor; } public boolean update(long id,String note){ ContentValues values=new ContentValues(); values.put(DatabaseHelper.field1, note); return db.update(DatabaseHelper.tableName, values, DatabaseHelper.field0+"="+id, null)>0; }}
