屏幕使用一个活动来实现，屏幕间是相互独立的，屏幕之间的跳转关系通过intent来实现。
屏幕间跳转分为以下几类：
1. 屏幕1直接跳转到屏幕2
intent intent = new intent();
intent.setclass(屏幕1活动名.this,屏幕2活动名.class);
startactivity(intent);
finish(); //结束当前活动
2. 屏幕1带参数跳转到屏幕2
使用bundle来传参数。
例子：猜拳游戏
界面：
重要代码：
电脑的选择是随机的，本次联系的基本思路是，三个选项利用三个数字来代替，让电脑 随机生成一个数字，根据数字的不同来产生不同的结果。
public void onclick(view v) {
switch (radiogroup.getcheckedradiobuttonid()){
case r.id.stone:
player = 0;
break;
case r.id.scissors:
player = 1;
break;
case r.id.textile:
player = 2;
break;
default:
toast.maketext(mainactivity.this, "请选择", toast.length_long).show();
break;
}
skip();
}
//页面跳转
private void skip(){
intent intent = new intent();
intent.setclass(mainactivity.this, resultmainactivity.class);
bundle bundle = new bundle();
bundle.putint("player", player);
bundle.putint("computer", new random().nextint(3));
intent.putextra("result", bundle);
startactivity(intent);
}
跳转之后，要接受参数：
bundle bundle = this.getintent().getbundleextra("result");
int playerint = bundle.getint("player");
int computerint = bundle.getint("computer");
猜拳游戏完整代码：
activity_first.xml代码
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<textview
android:id="@+id/textview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请选择您要出的拳:"
android:textsize="20dip" />
<radiogroup
android:id="@+id/quans"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<radiobutton
android:id="@+id/shitou"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="石头"
android:textsize="20dip" />
<radiobutton
android:id="@+id/jiandao"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textsize="20dip"
android:text="剪刀" />
<radiobutton
android:id="@+id/bu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textsize="20dip"
android:text="布" />
</radiogroup>
<button
android:id="@+id/chuquan"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textsize="20dip"
android:text="出拳" />
</linearlayout>
activity_second.xml代码
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<textview
android:id ="@+id/show"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textsize="20dip"
android:text="@string/hello_world" />
</linearlayout>
firstactivity.java代码
package com.example.caiquangame;
import java.util.random;
import android.os.bundle;
import android.app.activity;
import android.content.intent;
import android.view.view;
import android.view.view.onclicklistener;
import android.widget.button;
import android.widget.radiogroup;
import android.widget.toast;
import android.support.v4.app.navutils;
public class firstactivity extends activity {
private button chuquan;
private radiogroup quans;
private int player;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_first);
settitle("猜拳游戏");
chuquan = (button)findviewbyid(r.id.chuquan);
chuquan.setonclicklistener(mchuquanlistener);
quans = (radiogroup)findviewbyid(r.id.quans);
}
private onclicklistener mchuquanlistener = new onclicklistener()
{
@override
public void onclick(view arg0) {
// todo auto-generated method stub
switch(quans.getcheckedradiobuttonid())
{
case r.id.shitou:
player = 0;
break;
case r.id.jiandao:
player = 1;
break;
case r.id.bu:
player = 2;
break;
default:
toast.maketext(firstactivity.this, "请选择", toast.length_long).show();
break;
}
//将的到的值传给secondactivity
skip();
}
};
private void skip()
{
intent intent = new intent();
intent.setclass(firstactivity.this, secondactivity.class);
bundle bundle = new bundle();
bundle.putint("player", player);
bundle.putint("computer", new random().nextint(3));
intent.putextra("result", bundle);
startactivity(intent);
}
}
secondactivity.java代码
package com.example.caiquangame;
import android.os.bundle;
import android.app.activity;
import android.view.menu;
import android.view.menuitem;
import android.widget.textview;
import android.widget.toast;
import android.support.v4.app.navutils;
public class secondactivity extends activity {
private textview tv;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_second);
settitle("结果");
tv = (textview)findviewbyid(r.id.show);
bundle bundle = this.getintent().getbundleextra("result");
int playerint = bundle.getint("player");
int computerint = bundle.getint("computer");
tv.settext("猜拳结果\n");
tv.append("您的选择：");
intchangestring(playerint);
tv.append("电脑的选择：");
intchangestring(computerint);
tv.append("结果：");
if(playerint == 0)
{
if(computerint == 0)
{
tv.append("平局");
}
else if(computerint == 1)
{
tv.append("您是赢家");
}
else
{
tv.append("电脑是赢家");
}
}
else if(playerint == 1)
{
if(computerint == 0)
{
tv.append("电脑是赢家");
}
else if(computerint == 1)
{
tv.append("平局");
}
else
{
tv.append("您是赢家");
}
}
else
{
if(computerint == 0)
{
tv.append("您是赢家");
}
else if(computerint == 1)
{
tv.append("电脑是赢家");
}
else
{
tv.append("平局");
}
}
}
private void intchangestring(int n)
{
switch (n)
{
case 0:
tv.append("石头\n");
break;
case 1:
tv.append("剪刀\n");
break;
case 2:
tv.append("布\n");
break;
default:
toast.maketext(secondactivity.this, "错误", toast.length_long).show();
break;
}
}
}
3. 屏幕1跳转到屏幕2，屏幕2执行结束后有返回值到屏幕1（带返回值跳转）
参考示例程序：receiveresult（apidemo => app=>activity=>receiveresult）
重要代码：
//屏幕1调转到屏幕2
intent intent = new intent(forward.this,forwardtargetactivity.class);
startactivityforresult(intent, get_code);
//在屏幕2设置返回值
setresult(result_ok,(new intent()).setaction("violet!"));
finish();
//在屏幕1得到从屏幕2返回的内容
@override
protected void onactivityresult(int requestcode,int resultcode,intent data)
{
if(requestcode == get_code)
{
if(resultcode == result_canceled)
{
edit.append("canceled!");
}
else
{
edit.append("(okay ");
edit.append(integer.tostring(resultcode));
edit.append(")");
}
if(data!=null)
{
edit.append(data.getaction());
}
}
edit.append("\n");
}
