安卓第四天————利用两个activity实现切换效果

1.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="俺是第一个界面"

/>



<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="点击调用第二个activity"

android:id="@+id/mainbtn"

/>



</LinearLayout>

2.two.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="fill_parent"

android:layout_height="wrap_content"

android:text="俺是第二个界面"

/>



<Button

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="点击调用第一个activity"

android:id="@+id/twobtn"

/>

</LinearLayout>

3.MainActivity.java

package cn.class3g.activity;

import android.app.Activity;

import android.app.SearchManager.OnCancelListener;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity {

/** Called when the activity is first created. */

private Button mainbtn=null;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);



mainbtn=(Button) findViewById(R.id.mainbtn);



mainbtn.setOnClickListener(listener);



}



private OnClickListener listener= new OnClickListener() {



@Override

public void onClick(View v) {

// TODO Auto-generated method stub



Intent intent =new Intent();

//指定原本class 和要启动的class

intent.setClass(MainActivity.this, TwoActivity.class);



startActivity(intent);



MainActivity.this.finish();

}

};



}

4.TwoActivity.java

package cn.class3g.activity;

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 TwoActivity extends Activity {

private Button twobtn=null;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.two);



twobtn=(Button) findViewById(R.id.twobtn);



twobtn.setOnClickListener(listener);



}







private OnClickListener listener= new OnClickListener() {



@Override

public void onClick(View v) {

// TODO Auto-generated method stub



Intent intent =new Intent();



intent.setClass(TwoActivity.this, MainActivity.class);



startActivity(intent);



TwoActivity.this.finish();

}

};

}