文件结构图：
变量定义文件strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, ActivityMain!</string>
<string name="app_name">test2_4</string>
<string name="resultLabel">result</string>
<string name="symbol">乘以</string>
<string name="calculate">计算</string>
<string name="exit">退出</string>
<string name="about">关于</string>
</resources>
Main.xml 代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<EditText
android:layout_height="wrap_content"
android:id="@+id/factorOne"
android:layout_width="match_parent">
</EditText>
<TextView
android:text="@string/symbol"
android:id="@+id/symbol"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
<EditText
android:layout_height="wrap_content"
android:id="@+id/factorTwo"
android:layout_width="match_parent">
</EditText>
<Button
android:text="@string/calculate"
android:id="@+id/calculate"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</Button>
</LinearLayout>
对应的ActivityMain.java代码
package com.test2_4;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
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;
public class ActivityMain extends Activity {
/** Called when the activity is first created. */
private EditText factorOne=null;
private EditText factorTwo=null;
private TextView symbol=null;
private Button calculate=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//布局文件
setContentView(R.layout.main);
//取得对象
factorOne=(EditText)findViewById(R.id.factorOne);
factorTwo=(EditText)findViewById(R.id.factorTwo);
symbol=(TextView)findViewById(R.id.symbol);
calculate=(Button)findViewById(R.id.calculate);
//设置显示的值
symbol.setText(R.string.symbol);
calculate.setText(R.string.calculate);
//将监听器的对象绑定到按钮上
calculate.setOnClickListener(new calculatelistener());
}
//当客户点击MENU按钮的时候，调用该方法
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.add(0,1,1,R.string.about);
menu.add(0, 2, 2, R.string.exit);
return super.onCreateOptionsMenu(menu);
}
//当客户点击菜单当中的某一个选项时，会调用该方法
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
if (item.getItemId()==2)
{
finish();
}
return super.onOptionsItemSelected(item);
}
class calculatelistener implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//String factorOneStr=factorOneStr.getText();
String factorOneStr=factorOne.getText().toString().trim();
String factorTString=factorTwo.getText().toString().trim();
Intent intent=new Intent();
intent.putExtra("one", factorOneStr);
intent.putExtra("two", factorTString);
intent.setClass(ActivityMain.this, ResultActivity.class);
ActivityMain.this.startActivity(intent);
}
}
}
result.xml 布局文件
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:id="@+id/result"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>
代码实现ResultActivity.java文件
package com.test2_4;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class ResultActivity extends Activity{
private TextView resultView=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
//获取控件对象
resultView=(TextView)findViewById(R.id.result);
//获取参数值
Intent intent = getIntent();
String factorOneStr = intent.getStringExtra("one");
String factorTwoStr = intent.getStringExtra("two");
int factorOneInt=Integer.parseInt(factorOneStr);
int factorTwoInt=Integer.parseInt(factorTwoStr);
//计算2个数字的乘积
//resultView.setText(factorOneInt*factorTwoInt);
resultView.setText(factorOneInt*factorTwoInt + "");
/*
Intent intent=new Intent();
*/
//resultView.setText(factorOneStr+"\n"+factorTwoStr);
}
}
AndroidManifest.xml 定义Activity界面
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test2_4"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="2" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".ActivityMain"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ResultActivity" android:label="@string/app_name"></activity>
</application>
</manifest>
运行结果如下所示：
对话框弹出的方法：
<activity android:name=".ResultActivity" android:label="@string/app_name"
android:theme="@android:style/Theme.Dialog"
></activity>
