Android开发-身高体重指数（BIM）计算-定义Android列表（Manifest）并平添新活动（Activity）

* 作 者： 雷恒鑫
* 完成日期： 2012 年 08 月  08   日
* 版 本 号： V1.0
* 对任务及求解方法的描述部分
* 输入描述：
* 问题描述：
* 程序输出：

* 程序头部的注释结束

*/

Activity 分为独立的Activity和相依赖的Activity。

下面是对独立的Activity所做的实验：

新增加的“report.java”程序为：

package com.demo.android.bmi;import java.text.DecimalFormat;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class Report extends Activity {	/** Called when the activity is first created. */	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.report);		findViews();		showResults();		setListensers();	}	private Button button_calc;	private TextView view_result;	private TextView view_suggest;	private void findViews() {		button_calc = (Button) findViewById(R.id.report_back);		view_result = (TextView) findViewById(R.id.result);		view_suggest = (TextView) findViewById(R.id.suggest);	}	// Listen for button clicks	private void setListensers() {		button_calc.setOnClickListener(backMain);	}	private Button.OnClickListener backMain = new Button.OnClickListener() {		public void onClick(View v) {			//Close this Activity			Report.this.finish();		}};private void showResults(){	DecimalFormat nf = new DecimalFormat("0.00");	Bundle bunde = this.getIntent().getExtras();	double height = Double.parseDouble(bunde.getString("KEY_HEIGHT")) / 100;	double weight = Double.parseDouble(bunde.getString("KEY_WEIGHT"));	double BMI = weight / (height * height);	// Present result	view_result.setText(getString(R.string.bmi_result)			+ nf.format(BMI));	// Give health advice	if (BMI > 25) {		view_result.setText(R.string.advice_heavy);	} else if (BMI < 20) {		view_result.setText(R.string.advice_light);	} else {		view_result.setText(R.string.advice_average);	}}}

修改后的“Bmi.java”程序为：

package com.demo.android.bmi;import java.net.URISyntaxException;import java.text.DecimalFormat;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.Intent;import android.content.res.ColorStateList;import android.content.res.Resources;import android.content.res.XmlResourceParser;import android.net.Uri;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class Bmi extends Activity {	/**	 * Called when the activity is first created.	 * 	 * @param <calcBMI>	 */	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		findViews();		setListensers();	}	private Button button_calc;	private EditText field_height;	private EditText field_weight;	private TextView view_result;	private TextView view_suggest;	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);	}	// Listen for button clicks	private void setListensers() {		button_calc.setOnClickListener(calcBMI);	}	private Button.OnClickListener calcBMI = new Button.OnClickListener() {		public void onClick(View v) {				//Switch to report page			Intent intent = new Intent();			intent.setClass(Bmi.this, Report.class);			Bundle bundle = new Bundle();			bundle.putString("KEY_HEIGHT", field_height.getText().toString());			bundle.putString("KEY_WEIGHT", field_weight.getText().toString());			intent.putExtras(bundle);			startActivity(intent);			} 		};	}

运行结果：

经验积累：

1.我学会了如何使用Intent传递数据。

2.我学会了使用Intent接收信息。