欢迎界面Splash

安卓程序一般会设置一个打开时的欢迎界面，下面我用Splash做一个欢迎界面，代码如下

MainActivity.java

package cn.wuxiaocheng.splash;

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

public class MainActivity extends Activity {
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

}

SplashActivity.java

package cn.wuxiaocheng.splash;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.Window;

public class SplashActivity extends Activity {

    private final int SPLASH_DISPLAY_LENGHT=3000;    //    延时3秒,,可以不写这段，直接在下面SPLASH_DISPLAY_LENGHT改为延时的时间就行
    
    //加载欢迎界面
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);        //设置无标题
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_welcome);

        // 为了减少代码使用匿名Handler创建一个延时的调用
        new Handler().postDelayed(new Runnable(){ 

             @Override
             public void run() { 
                //通过Intent打开最终真正的主界面Main这个Activity
                 Intent mainIntent = new Intent(SplashActivity.this,MainActivity.class);
               //启动Main界面
                 SplashActivity.this.startActivity(mainIntent); 
               //关闭自己这个开场屏    
                 SplashActivity.this.finish(); 
             } 
                 
            }, SPLASH_DISPLAY_LENGHT); 
    }
}

activity_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:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/splash_welcome"/>
    
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.wuxiaocheng.splash"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="21" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
    <!-- 下面这个activity设置打开程序是第一个页面为欢迎界面-->
        <activity
            android:name="cn.wuxiaocheng.splash.SplashActivity"
            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="cn.wuxiaocheng.splash.MainActivity"></activity>
    </application>

</manifest>