MainActivity.java:

package com.example.weatherdemo;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity {//定义菜单项    final static int menu_one = Menu.FIRST;    final static int menu_sec = Menu.FIRST + 1;    final static int menu_tri = Menu.FIRST + 2;            @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    @Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.//getMenuInflater().inflate(R.menu.sec, menu);menu.add(0,menu_one,0,"天气预报").setIcon(android.R.drawable.btn_star);menu.add(0,menu_sec,1,"历史数据").setIcon(android.R.drawable.btn_star);menu.add(0,menu_tri,2,"系统设置").setIcon(android.R.drawable.btn_star);return true;}    @Overridepublic boolean onOptionsItemSelected(MenuItem item) {// TODO Auto-generated method stubswitch(item.getItemId()){case menu_one:return true;case menu_sec:Intent in = new Intent(MainActivity.this,SecActivity.class);finish();startActivity(in);return true;case menu_tri:Intent in2 = new Intent(MainActivity.this,TriActivity.class);finish();startActivity(in2);return true;}return false;}    }


SecActivity.java：

package com.example.weatherdemo;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.MenuItem;import android.widget.ArrayAdapter;import android.widget.ListView;public class SecActivity extends Activity {//定义菜单项    final static int menu_one = Menu.FIRST;    final static int menu_sec = Menu.FIRST + 1;    final static int menu_tri = Menu.FIRST + 2;private ListView userlv;List list;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_sec);userlv=(ListView)findViewById(R.id.userlv);  list=new ArrayList();list.add("信息1");list.add("信息2");list.add("信息3");list.add("信息4");list.add("信息5");list.add("信息6");list.add("信息7");ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,list);  userlv.setAdapter(adapter);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.menu.add(0,menu_one,0,"天气预报").setIcon(android.R.drawable.btn_star);menu.add(0,menu_sec,1,"历史数据").setIcon(android.R.drawable.btn_star);menu.add(0,menu_tri,2,"系统设置").setIcon(android.R.drawable.btn_star);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// TODO Auto-generated method stubswitch(item.getItemId()){case menu_one:Intent in = new Intent(SecActivity.this,MainActivity.class);finish();startActivity(in);return true;case menu_sec:return true;case menu_tri:Intent in2 = new Intent(SecActivity.this,TriActivity.class);finish();startActivity(in2);return true;}return false;}}


TriActivity.java:

package com.example.weatherdemo;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.MenuItem;public class TriActivity extends Activity {//定义菜单项    final static int menu_one = Menu.FIRST;    final static int menu_sec = Menu.FIRST + 1;    final static int menu_tri = Menu.FIRST + 2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_tri);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.menu.add(0,menu_one,0,"天气预报").setIcon(android.R.drawable.btn_star);menu.add(0,menu_sec,1,"历史数据").setIcon(android.R.drawable.btn_star);menu.add(0,menu_tri,2,"系统设置").setIcon(android.R.drawable.btn_star);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// TODO Auto-generated method stubswitch(item.getItemId()){case menu_one:Intent in2 = new Intent(TriActivity.this,MainActivity.class);finish();startActivity(in2);return true;case menu_sec:Intent in = new Intent(TriActivity.this,SecActivity.class);finish();startActivity(in);return true;case menu_tri:return true;}return false;}}


activity_main.xml:

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <ImageView        android:id="@+id/imageView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginLeft="116dp"        android:layout_marginTop="170dp"        android:src="@drawable/ic_launcher" />    <ImageView        android:id="@+id/imageView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/imageView1"        android:layout_marginTop="51dp"        android:layout_toLeftOf="@+id/imageView3"        android:src="@drawable/ic_launcher" />    <ImageView        android:id="@+id/imageView5"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/imageView4"        android:layout_marginLeft="33dp"        android:layout_toRightOf="@+id/imageView1"        android:src="@drawable/ic_launcher" />    <ImageView        android:id="@+id/imageView4"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/imageView1"        android:layout_alignTop="@+id/imageView2"        android:layout_marginLeft="32dp"        android:src="@drawable/ic_launcher" />    <ImageView        android:id="@+id/imageView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/imageView1"        android:layout_alignTop="@+id/imageView4"        android:layout_marginRight="19dp"        android:src="@drawable/ic_launcher" /></RelativeLayout>


activity_sec.xml:

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".SecActivity" >    <ListView        android:id="@+id/userlv"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true" >    </ListView></RelativeLayout>


activity_tri.xml:

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".TriActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginTop="26dp"        android:text="@string/city" />    <EditText        android:id="@+id/editText1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/textView1"        android:layout_alignBottom="@+id/textView1"        android:layout_toRightOf="@+id/textView1"        android:ems="10" >        <requestFocus />    </EditText>    <EditText        android:id="@+id/editText2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/textView2"        android:layout_alignBottom="@+id/textView2"        android:layout_toLeftOf="@+id/editText1"        android:layout_toRightOf="@+id/textView2"        android:ems="10"        android:inputType="number" />    <TextView        android:id="@+id/textView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/editText2"        android:layout_alignBottom="@+id/editText2"        android:layout_alignLeft="@+id/editText1"        android:layout_marginLeft="14dp"        android:text="@string/time2" />    <TextView        android:id="@+id/textView4"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView2"        android:layout_below="@+id/editText2"        android:layout_marginTop="23dp"        android:text="@string/message" />    <CheckBox        android:id="@+id/checkBox1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/textView4"        android:layout_alignBottom="@+id/textView4"        android:layout_toRightOf="@+id/textView4"        android:text="@string/message2" />    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView1"        android:layout_below="@+id/editText1"        android:layout_marginTop="26dp"        android:text="@string/time" />    <TextView        android:id="@+id/textView5"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView4"        android:layout_below="@+id/checkBox1"        android:layout_marginTop="28dp"        android:text="@string/message3" />    <CheckBox        android:id="@+id/checkBox2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/textView5"        android:layout_alignBottom="@+id/textView5"        android:layout_toRightOf="@+id/textView5"        android:text="@string/message2" />    <EditText        android:id="@+id/editText3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/textView6"        android:layout_alignBottom="@+id/textView6"        android:layout_toRightOf="@+id/textView6"        android:ems="10" />    <TextView        android:id="@+id/textView6"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView5"        android:layout_below="@+id/checkBox2"        android:layout_marginTop="51dp"        android:text="@string/message4" /></RelativeLayout>


效果图：

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