Google Android开发入门指南（第2版）随书光盘（实例源码）

package com.demo.android.abmi; import java.text.DecimalFormat; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.SharedPreferences; import android.content.pm.ActivityInfo; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast; //aBMI is for British system public class Abmi extends Activity { private static final String TAG = "aBmi"; public static final String PREF = "BMI_PREF"; public static final String PREF_FEET = "BMI_Feet"; public static final String PREF_INCH = "BMI_Inch"; /* static final String[] feets= new String[] { "2 Feet", "3 Feet", "4 Feet", "5 Feet", "6 Feet", "7 Feet", "8 Feet" }; */ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //force locale /* Resources res = getResources(); Configuration conf = res.getConfiguration(); conf.locale = Locale.TRADITIONAL_CHINESE; DisplayMetrics dm = res.getDisplayMetrics(); res.updateConfiguration(conf, dm); */ setContentView(R.layout.main); findViews(); setListensers(); restorePrefs(); /* ArrayAdapter<String> adapter_feet = new ArrayAdapter<String>( this, android.R.layout.simple_spinner_item, feets); adapter_feet.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); */ //setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); } /* @Override protected void onRestoreInstanceState(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onRestoreInstanceState(savedInstanceState); field_weight.setText(savedInstanceState.getString("WEIGHT")+"1"); } @Override protected void onSaveInstanceState(Bundle outState) { // TODO Auto-generated method stub super.onSaveInstanceState(outState); outState.putString("WEIGHT", field_weight.getText().toString()); } */ // Restore preferences private void restorePrefs() { SharedPreferences settings = getSharedPreferences(PREF, 0); //set field Integer pref_feet = settings.getInt(PREF_FEET, 5); field_feet.setSelection(pref_feet); field_inch.requestFocus(); Integer pref_inch = settings.getInt(PREF_INCH, 0); field_inch.setSelection(pref_inch); field_weight.requestFocus(); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); // Save user preferences. SharedPreferences settings = getSharedPreferences(PREF, 3); settings.edit() .putInt(PREF_FEET, field_feet.getSelectedItemPosition()) .putInt(PREF_INCH, field_inch.getSelectedItemPosition()) .commit(); } private Button button_calc; //private EditText field_feet; //private EditText field_inch; private Spinner field_feet; private Spinner field_inch; private EditText field_weight; private TextView view_result; private TextView view_suggest; private void findViews() { Log.d(TAG, "find Views"); button_calc = (Button) findViewById(R.id.submit); //field_feet = (EditText) findViewById(R.id.feet); //field_inch = (EditText) findViewById(R.id.inch); field_feet = (Spinner) findViewById(R.id.feet); field_inch = (Spinner) findViewById(R.id.inch); field_weight = (EditText) findViewById(R.id.weight); view_result = (TextView) findViewById(R.id.result); view_suggest = (TextView) findViewById(R.id.suggest); ArrayAdapter<CharSequence> adapter_feet = ArrayAdapter.createFromResource( this, R.array.feets, android.R.layout.simple_spinner_item); adapter_feet.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); field_feet.setAdapter(adapter_feet); ArrayAdapter<CharSequence> adapter_inch = ArrayAdapter.createFromResource( this, R.array.inches, android.R.layout.simple_spinner_item); adapter_inch.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); field_inch.setAdapter(adapter_inch); } //Listen for button clicks private void setListensers() { Log.d(TAG, "set Listensers"); field_feet.setOnItemSelectedListener(getFeet); field_inch.setOnItemSelectedListener(getInch); button_calc.setOnClickListener(calcUsBMI); } private int feet; private int inch; private Spinner.OnItemSelectedListener getFeet = new Spinner.OnItemSelectedListener() { public void onItemSelected(AdapterView parent, View v, int position, long id) { feet = parent.getSelectedItemPosition()+2; } public void onNothingSelected(AdapterView parent) { } }; private Spinner.OnItemSelectedListener getInch = new Spinner.OnItemSelectedListener() { public void onItemSelected(AdapterView parent, View v, int position, long id) { inch = parent.getSelectedItemPosition()+1; } public void onNothingSelected(AdapterView parent) { } }; private Button.OnClickListener calcUsBMI = new Button.OnClickListener() { public void onClick(View v) { DecimalFormat nf = new DecimalFormat("0.00"); try { /* double height = (Double.parseDouble(field_feet.getText().toString())*12+Double.parseDouble(field_inch.getText().toString()))*2.54/100; */ double height = (feet*12+inch)*2.54/100; double weight = Double.parseDouble(field_weight.getText().toString())*0.45359; double BMI = weight / (height * height); //Present result view_result.setText(getText(R.string.bmi_result) + nf.format(BMI)); //Give health advice if(BMI > 27) { view_suggest.setText(R.string.advice_fat); } else 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) { Toast.makeText(Abmi.this, getString(R.string.input_error), Toast.LENGTH_SHORT).show(); } } }; protected static final int MENU_ABOUT = Menu.FIRST; @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub Log.d(TAG, "open Menu"); menu.add(0, MENU_ABOUT, 0, R.string.about_label); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub Log.d(TAG, "select Menu Item"); switch(item.getItemId()) { case MENU_ABOUT: openOptionsDialog(); break; } return super.onOptionsItemSelected(item); } private void openOptionsDialog() { Log.d(TAG, "open Dialog"); new AlertDialog.Builder(this) .setTitle(R.string.about_title) .setMessage(R.string.about_msg) .setPositiveButton(R.string.ok_label, new DialogInterface.OnClickListener(){ public void onClick( Dialog