通过计算结果从当前Activity跳转到下一个Activity

package com.example.newactivityapp;

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.EditText;
import android.widget.TextView;
import android.widget.Button;

public class NewActivity extends Activity {
private TextView symbol;
private EditText factorone;
private EditText factortwo;
private Button  calcuate;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置布局文件
setContentView(R.layout.new_activity);
//设置文本id
symbol = (TextView)findViewById(R.id.symbol);
//设置编辑框id
factorone = (EditText)findViewById(R.id.factorone);
factortwo = (EditText)findViewById(R.id.factortwo);
//设置按钮id
calcuate = (Button)findViewById(R.id.calcuate);
//设置文本框和按钮文字
symbol.setText(R.string.symbol);
calcuate.setText(R.string.calcuate);
//设置监听器
calcuate.setOnClickListener(new OnClickListenerlmpl());
}

//复写菜单函数
public boolean onCreateOptionsMenu(Menu menu) {
//调用menu的add方法,第一参数为菜单组名，第二参数为当前菜单id,第三为排序，第四为菜单按钮上显示的文字
menu.add(0,1,1,R.string.exit);
menu.add(0,2,2,R.string.about);
return super.onCreateOptionsMenu(menu);
}

//指定菜单按钮动作，item.getItemId() == 1为exit按钮，若为exit按钮退出当前界面
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == 1)
finish();
return super.onOptionsItemSelected(item);
}

private class OnClickListenerlmpl implements OnClickListener {
@Override
public void onClick(View v) {
//取出编辑框文字转为字符串给相应的变量
String factoronestr = factorone.getText().toString();
String factortwostr = factortwo.getText().toString();
Intent intent = new Intent();
//通过intent对象传入值，第一个参数为值的标记，第二个参数为要传入的值
intent.putExtra("one", factoronestr);
intent.putExtra("two", factortwostr);
//通过intent的setclass方法设置要跳转的对象,第一个参数为从当前activity开始跳转，第二参数为要跳转到哪个activity
intent.setClass(NewActivity.this, ResultActivity.class);
//从当前类开始跳转
NewActivity.this.startActivity(intent);
}
}
}

package com.example.newactivityapp;

import android.app.Activity;

import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class ResultActivity extends Activity {

private TextView resultview;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result_activity);
resultview = (TextView)findViewById(R.id.result);
//取得要传入的intent对象
Intent intent = getIntent();
//根据标记"one"取得相应的值
String factoronestr = intent.getStringExtra("one");
String factortwostr = intent.getStringExtra("two");
//将取得的字符串转为整型
int factoroneInt = Integer.parseInt(factoronestr);
int factortwoInt = Integer.parseInt(factortwostr);
int result = factoroneInt * factortwoInt;
//设置积的文本,整型加上字符串后自动转为字符串
resultview.setText(result + "");
}
}

ResultActivity在mainfest文件中注册 <activity android:name=".ResultActivity"/>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.newactivityapp"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.newactivityapp.NewActivity"
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"/>
</application>

</manifest>

全部代码

package com.example.newactivityapp;

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.EditText;
import android.widget.TextView;
import android.widget.Button;

public class NewActivity extends Activity {
private TextView symbol;
private EditText factorone;
private EditText factortwo;
private Button  calcuate;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_activity);
symbol = (TextView)findViewById(R.id.symbol);
factorone = (EditText)findViewById(R.id.factorone);
factortwo = (EditText)findViewById(R.id.factortwo);
calcuate = (Button)findViewById(R.id.calcuate);
symbol.setText(R.string.symbol);
calcuate.setText(R.string.calcuate);
calcuate.setOnClickListener(new OnClickListenerlmpl());
}

public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0,1,1,R.string.exit);
menu.add(0,2,2,R.string.about);
return super.onCreateOptionsMenu(menu);
}

public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == 1)
finish();
return super.onOptionsItemSelected(item);
}

private class OnClickListenerlmpl implements OnClickListener {
@Override
public void onClick(View v) {
String factoronestr = factorone.getText().toString();
String factortwostr = factortwo.getText().toString();
Intent intent = new Intent();
intent.putExtra("one", factoronestr);
intent.putExtra("two", factortwostr);
intent.setClass(NewActivity.this, ResultActivity.class);
NewActivity.this.startActivity(intent);
}
}
}

package com.example.newactivityapp;

import android.app.Activity;

import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class ResultActivity extends Activity {

private TextView resultview;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result_activity);
resultview = (TextView)findViewById(R.id.result);
Intent intent = getIntent();
String factoronestr = intent.getStringExtra("one");
String factortwostr = intent.getStringExtra("two");
int factoroneInt = Integer.parseInt(factoronestr);
int factortwoInt = Integer.parseInt(factortwostr);
int result = factoroneInt * factortwoInt;
resultview.setText(result + "");
}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.newactivityapp"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.newactivityapp.NewActivity"
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"/>
</application>

</manifest>