Android
package com.demo.android.bmi;
import java.text.DecimalFormat;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class Main extends Activity {
protected static final int MENU_ABOUT = Menu.FIRST;
protected static final int MENU_QUIT = Menu.FIRST+1;
private Button button_calc;
private EditText field_height;
private EditText field_weight;
private TextView view_result;
private TextView view_good_weight;
private TextView view_suggest;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findviews();
setListensers();
}
private void findviews() {
button_calc = (Button)findViewById(R.id.submit);
field_height=(EditText)findViewById(R.id.height);
field_weight=(EditText)findViewById(R.id.weight);
view_result=(TextView)findViewById(R.id.result);
view_suggest=(TextView)findViewById(R.id.suggest);
view_good_weight=(TextView)findViewById(R.id.goodWeight);
}
private void setListensers() {
button_calc.setOnClickListener(calcBMI);
}
private OnClickListener calcBMI = new OnClickListener(){
public void onClick(View v){
DecimalFormat nf = new DecimalFormat("0.0");
try{
double height = Double.parseDouble( field_height.getText().toString() ) / 100;
double weight = Double.parseDouble( field_weight.getText().toString() );
double BMI=weight / ( height * height );
view_result.setText( getText( R.string.bmi_result ) + nf.format(BMI) );
double min_weight=20 * ( height * height );
double max_weight=25 * ( height * height );
view_good_weight.setText( getText( R.string.goodWeight ) + nf.format(min_weight) + "~" + nf.format(max_weight) );
//建議
if(BMI > 25){
view_suggest.setText(R.string.advice_heavy);
}else if(BMI < 20){
view_suggest.setText(R.string.advice_light);
}else{
view_suggest.setText(R.string.advice_average);
}
}catch(Exception obj){
//隱現視窗，LENGTH_SHORT短訊息
Toast.makeText(Main.this, R.string.errMsg1, Toast.LENGTH_SHORT).show();
}
}
};
private void openOptionsDialog() {
//建立具名實體，會佔記憶體到關閉程式為止 Main.this 是指建立在目前畫面之上
/*
AlertDialog.Builder dialog = new AlertDialog.Builder(Main.this);
dialog.setTitle("關於BMI App");
dialog.setMessage("這只是我練習的一個小App啦~");
dialog.show();
*/
//建立對話框匿名實體，結束就釋放記憶體，適合短暫秀出
new AlertDialog.Builder(Main.this)
.setTitle(R.string.aboutTitle)
.setMessage(R.string.aboutContent)
.setPositiveButton(R.string.label_ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
})
.setNegativeButton(R.string.label_homepage,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//連到某個網址，地圖可用 geo: 經度 , 緯度，電話tel:2130669
// Uri.parse不支援資源識別符號，所以用getString()取得實際值
Uri uri = Uri.parse( getString( R.string.label_homepage_url ) );
//"意圖"實體，ACTION_VIEW 根據不同檔案類型，自動執行關聯軟體
//ACTION_DIAL可撥電話
Intent intent = new Intent(Intent.ACTION_VIEW , uri);
//執行意圖
startActivity(intent);
}
})
.show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
//menu.add(0 , MENU_ABOUT , 0 , R.string.menu_about).setIcon(R.drawable.about);
//menu.add(0 , MENU_QUIT , 0 , R.string.menu_quit).setIcon(R.drawable.close);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
switch(item.getItemId()){
//case MENU_ABOUT:
case R.id.about:
openOptionsDialog();
break;
//case MENU_QUIT:
case R.id.finish:
finish();
break;
}
return super.onOptionsItemSelected(item);
}
}