欢迎界面

本文来自rydiy的博客：http://blog.youkuaiyun.com/crasyman2008

看到很多的应用都有欢迎界面，今天就来学习下欢迎界面的实现，边学边写。

方法有两种，第一，启动时启动一个activity，几秒之后打开另一个activity。 第二，使用同一个activity，加载2次layout。

 

一、2个activity

1、先定义2个layout：

welcome.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" >
    
    <ImageView android:id="@+id/welcome_imgview"
        android:src="@drawable/welcome_pic"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scaleType="center"/>
</LinearLayout>

main.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="@string/hello" />

</LinearLayout>

 

2、主界面

MainActivity.java

package com.rydiy.welcome;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}
}

修改manifest.xml,增加

 <activity android:name="MainActivity"></activity>

3、欢迎界面

SplashActivity.java

package com.rydiy.cooldoodle;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
public class SplashActivity extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  // welcome image
  setContentView(R.layout.welcome);
  new Handler().postDelayed(new Runnable() {
   @Override
   public void run() {
    // TODO Auto-generated method stub
    startActivity(new Intent(getApplication(),
      ProjectActivity.class));
    SplashActivity.this.finish();
   }
  }, 3000);
 }
}

这样就ok了， 启动展示欢迎界面3s后转主界面。
 
二、同一个activity中实现
1、创建2个layout，同上
2、修改SplashActivity.java
package com.rydiy.welcome;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

public class SplashActivity extends Activity {
	private Handler mHandle = new Handler(){
		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			if(msg.arg1 == 1)
				setContentView(R.layout.main);
		}
	};
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.welcome);
        new Thread(){
        	public void run() {			
        	   Message msg = Message.obtain(mHandle); 
        	   msg.arg1 = 1;
        	   mHandle.sendMessageDelayed(msg, 3000);
        	}
        }.start();
    }
}
 
 
搞定，睡觉。。。