两个Activity切换例子

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Activity01

import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class Activity01 extends Activity {        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);  /* 设置显示main.xml布局 */                      Button button = (Button)this.findViewById(R.id.button1);        button.setOnClickListener(new Button.OnClickListener(){        public void onClick(View v){        //新建一个Intent        Intent intent = new Intent();        //制定intent要启动的类        intent.setClass(Activity01.this, Activity02.class);        //启动一个新的Activity        startActivity(intent);        //关闭当前的        Activity01.this.finish();                }        });    }        }

Activity02

import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class Activity02 extends Activity{/*savedInstanceState 保存当前Activity的状态信息。*/public void onCreate(Bundle savedInstanceState)   {super.onCreate(savedInstanceState);//调用父类的onCreate构造函数) /* 设置显示main2.xml布局 */setContentView(R.layout.main2); /* findViewById(R.id.button2)取得布局main.xml中的button2 */Button button = (Button) findViewById(R.id.button2);/* 监听button的事件信息 */button.setOnClickListener(new Button.OnClickListener(){public void onClick(View v){/* 新建一个Intent对象 */Intent intent = new Intent();/* 指定intent要启动的类 */intent.setClass(Activity02.this, Activity01.class);/* 启动一个新的Activity */startActivity(intent);/* 关闭当前的Activity */Activity02.this.finish();}});}}

strings.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">第一个Activity</string>    <string name="hello2">第二个Activity</string>        <string name="app_name">Activity切换</string></resources>

main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello"     />    <Button        android:layout_width="100px"        android:layout_height="wrap_content"        android:layout_x = "120px"        android:layout_y = "90px"        android:text ="切换"        android:id="@+id/button1"        >     </Button>   </LinearLayout>

main2.xml

<?xml version="1.0" encoding="UTF-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello2"     />    <Button        android:layout_width="100px"        android:layout_height="wrap_content"        android:layout_x = "120px"        android:layout_y = "90px"        android:text ="切换"        android:id="@+id/button2"        >     </Button>   </LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.lysine"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="7" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:name=".Activity01"            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="Activity02">         </activity>                    </application></manifest>