Android专题1——创建多个Activity

1.创建第二个Activity的布局文件

 2.创建新Activity对象类

 3.在AndroidManifest中组册该Activity

 

4.创建Intent对象启动新的Activity

具体代码

MainActivity

public class MainActivity extends Activity {
    
    private Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button)findViewById(R.id.button);
        ButtonListener buttonListener = new ButtonListener();
        button.setOnClickListener(buttonListener);
    }

    private class ButtonListener implements OnClickListener{

        @Override
        public void onClick(View button) {
            Intent intent = new Intent();
            //高速操作系统MainActivity要求调到SecondActivity
            //具体含义现在不清楚
            intent.setClass(MainActivity.this, SecondActivity.class);
            //按照intent对象启动Activity
            startActivity(intent);
        }
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

 

SecondActivity

package com.njulya.mulityactivity;

import android.app.Activity;
import android.os.Bundle;
//继承Activity类
public class SecondActivity extends Activity{
//重写onCreate方法
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        //导入这个Activity对应的布局文件
        setContentView(R.layout.activity_second);
    }
    
}

 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" >

    <Button 
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第二个Activity"/>

</RelativeLayout>

 

activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="这是第二个Activity"/>

</LinearLayout>