一个简单的页面跳转

package demo.test;

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

public class testmain extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button btn=(Button)findViewById(R.id.Button01); 
        
        btn.setOnClickListener(new  View.OnClickListener() { 
          public void onClick(View view) { 
           Intent intent=new Intent();
        intent.setClass(testmain.this,testchild.class);
        startActivity(intent);
        finish();
          } 
        });
        
        
        
       
    }
}

package demo.test;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class testchild extends Activity {
     /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.child2);
   Button btn=(Button)findViewById(R.id.Button01); 
        
        btn.setOnClickListener(new  View.OnClickListener() { 
          public void onClick(View view) { 
           Intent intent=new Intent();
        intent.setClass(testchild.this,testmain.class);
        startActivity(intent);
        finish();
          } 
        });
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="demo.test"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".testmain"
                  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=".testchild"
                  android:label="@string/app_name">
           
        </activity>
    </application>


</manifest>