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();
   }
  };
}