Android开发之初级开发_Activity之间切换

这儿实现是的两个activity之间的相互切换；

FirstActivity.java类：

package com.example.demo_activitychange;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FirstActivity extends Activity
{
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
Button btn=(Button)findViewById(R.id.btn_01);
btn.setOnClickListener(new OnClickListener()
{

@Override
public void onClick(View v)
{
//申明intent
Intent intent=new Intent();
//设置跳转activity
intent.setClass(FirstActivity.this, SecondActivity.class);
//启动intent
startActivity(intent);
//关闭当前activity
finish();
}
});
}

public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.first, menu);
return true;
}

}

 

SecondActivity.java类：

package com.example.demo_activitychange;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SecondActivity extends Activity
{

@Override
protected void onCreate(Bundle savedInstanceState)
{

super.onCreate(savedInstanceState);
setContentView(R.layout.second_activity);
Button btn = (Button) findViewById(R.id.btn_02);
btn.setOnClickListener(new OnClickListener()
{

@Override
public void onClick(View v)
{
// 申明intent
Intent intent = new Intent();
// 设置跳转activity
intent.setClass(SecondActivity.this, FirstActivity.class);
// 启动intent
startActivity(intent);
// 关闭当前activity
finish();
}
});
}

}

 

当然也要为两个activity设置各自的布局文件，

first_activity.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=".FirstActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="23dp"
android:text="第一个页面" />
<Button
android:id="@+id/btn_01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:text="切 换"
/>

</RelativeLayout>

 

second_activity.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=".FirstActivity" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第二个页面"
android:textSize="23dp" />

<Button
android:id="@+id/btn_02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:text="返 回" />

</RelativeLayout>

 

最后还要在AndroidManifest.xml文件夹中注册SecondActivity.java

 

<activity android:name="com.example.demo_activitychange.SecondActivity" >
</activity>