方法一:

很多应用都会有一个启动界面。欢迎画面慢慢隐现,然后慢慢消隐。实现这种效果的方法有两种(暂时只发现两种)
1、使用两个Activity,程序启动时候load第一张Activity,然后由tick触发N秒钟后startActivity另外一张Activity。
2、使用一个Activity,可以用到View.gone() 这个方法。把Acitivity的某些元素移除。

1、两个Activity:
首先是AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.sunshine.splash" 
      android:versionCode="1" 
      android:versionName="1.0"> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
        <activity android:name=".Splash" 
                  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="Main">
    </activity> 
</application> 
    <uses-sdk android:minSdkVersion="3" /> 
</manifest>

 

然后是JAVA代码:

package net.hlovey.splash; 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.os.Handler; 
  
public class Splash extends Activity {    
  
    private final int SPLASH_DISPLAY_LENGHT = 3000; //延迟三秒  
  
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.splash); 
        new Handler().postDelayed(new Runnable(){ 
  
         @Override 
         public void run() { 
             Intent mainIntent = new Intent(Splash.this,Main.class); 
             Splash.this.startActivity(mainIntent); 
                 Splash.this.finish(); 
         } 
            
        }, SPLASH_DISPLAY_LENGHT); 
    } 
}

当然可以再Splash中加入动画效果。(我觉得先要布局好AndroidManifest.xml。因为那才是工程的索引文件。首先在那要有一个统筹!而不是先写java code。然后逐步往xml中增加 ,这说明对整个项目没有一个统筹的设计)

 

方法二:

androidmanifest.xml就不多说了。先看布局代码:

<?xml version=”1.0″ encoding=”utf-8″?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android”
 android:orientation=”vertical”
 android:layout_width=”fill_parent”
 android:layout_height=”fill_parent”>   
     <LinearLayout android:id=”@+id/splashscreen” android:orientation=”vertical”
          android:layout_width=”fill_parent” android:layout_height=”fill_parent”>
          <ImageView  android:layout_width=”wrap_content”
               android:layout_height=”wrap_content” android:src=”@drawable/splash”
               android:layout_gravity=”center”
               android:layout_marginTop=”130px”/>
          <TextView
               android:id=”@+id/info”
               android:layout_width=”fill_parent”
               android:layout_height=”wrap_content”
               android:gravity=”center”
               android:paddingTop=”10px”
               android:text=”This is a splash!!”/>
     </LinearLayout>     
 <WebView android:id=”@+id/browser”
  android:layout_width=”fill_parent”
  android:layout_height=”fill_parent” android:layout_weight=”1″/>
</LinearLayout>

 

有一个id为splashscreen 的linearlayout,是程序启动时显现的部分。id为browser是程序的主界面显示部分。

package net.hlovey.s; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.os.Bundle; 
import android.os.Handler; 
import android.os.Message; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.animation.Animation; 
import android.view.animation.AnimationUtils; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
import android.widget.Toast; 
public class WebGameActivity extends Activity { 
  
  private WebView webView;  
    
  private Handler mHandler = new Handler(); 
  
  private static final String TAG = "WebGameActivity";   
  //菜单 
  private static final int MENU_RELOAD = Menu.FIRST; 
  private static final int MENU_HELP = Menu.FIRST + 1; 
  private static final int MENU_ABOUT = Menu.FIRST + 2; 
  private static final int MENU_CLOSE = Menu.FIRST + 3;   
  private int staus  = 0;  
   
  private static final int  STOPSPLASH = 0; 
  //time in milliseconds 
  private static final long SPLASHTIME = 1000; 
   
  private LinearLayout splash; 
  private TextView tv; 
  
  private Animation myAnimation_Alpha; 
  private Animation animatinoGone ; 
  
  private Handler splashHandler = new Handler() { 
    public void handleMessage(Message msg) { 
         switch (msg.what) { 
         case STOPSPLASH: 
              if( staus == 1 ){                
                splash.startAnimation(animatinoGone); 
                splash.setVisibility(View.GONE); 
                break; 
              } 
              sendEmptyMessageDelayed(STOPSPLASH, SPLASHTIME); 
         } 
         super.handleMessage(msg); 
    } 
}; 
  
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getWindow().requestFeature(Window.FEATURE_PROGRESS); //去标题栏 
    setContentView(R.layout.main);    
    animatinoGone = AnimationUtils.loadAnimation(this,R.anim.alpha_gone); //动画效果 
    myAnimation_Alpha = AnimationUtils.loadAnimation(this,R.anim.alpha_action); //动画效果 
    
    splash = (LinearLayout) findViewById(R.id.splashscreen); 
    tv = (TextView) findViewById(R.id.info); 
    tv.setText("正在建立数据连接"); 
    splash.startAnimation(myAnimation_Alpha); 
    
    Message msg = new Message(); 
    msg.what = STOPSPLASH; 
    splashHandler.sendMessageDelayed(msg, SPLASHTIME); 
  
}

 

 

------------------------------------------------------------------------------------------

每个Android应用启动之后都会出现一个Splash启动界面,显示产品的LOGO、公司的LOGO或者开发者信息。如果应用程序启动时间比较长,那么启动界面就是一个很好的东西,可以让用户耐心等待这段枯燥的时间。

  • 制作Splash界面
    突出产品LOGO,产品名称,产品主要特色;
    注明产品的版本信息;
    注明公司信息或者开发者信息;
    背景图片,亦可以用背景颜色代替;
  • 除了等待还能做点什么
    大多数的Splash界面都是会等待一定时间,然后切换到下一个界面;
    其实,在这段时间里,可以对系统状况进行检测,比如网络是否通,电源是否充足;
    或者,预先加载相关数据;
    为了能让启动界面展现时间固定,需要计算执行以上预处理任务所花费的时间,那么:启动界面SLEEP的时间=固定时间-预处理任务时间
  • 源码示例(以Wordpress的Android客户端为例)
    AndroidMenifest.xml
< 
       activity  
       android:icon 
       ="@drawable/app_icon" 
       
android:screenOrientation 
       ="portrait" 
       
android:name 
       =".splashScreen" 
       
android:theme 
       ="@android:style/Theme.NoTitleBar" 
       > 
       
 
       < 
       intent-filter 
       > 
       
 
       < 
       action  
       android:name 
       ="android.intent.action.MAIN" 
       /> 
       
 
       < 
       category  
       android:name 
       ="android.intent.category.LAUNCHER" 
       /> 
       
 
       </ 
       intent-filter 
       > 
       
 
       </ 
       activity 
       >•  splashScreen.java
package 
        org.wordpress.android;

 
       import 
        android.app.Activity;
 
       import 
        android.content.Intent;
 
       import 
        android.content.pm.PackageInfo;
 
       import 
        android.content.pm.PackageManager;
 
       import 
        android.content.pm.PackageManager.NameNotFoundException;
 
       import 
        android.graphics.PixelFormat;
 
       import 
        android.os.Bundle;
 
       import 
        android.os.Handler;
 
       import 
        android.view.WindowManager;
 
       import 
        android.widget.TextView;


 
       public 
       class 
        splashScreen  
       extends 
        Activity {
 
       /** 
       
* Called when the activity is first created.
 
       */ 
       

@Override
 
       public 
       void 
        onCreate(Bundle icicle) {
 
       super 
       .onCreate(icicle);
getWindow().setFormat(PixelFormat.RGBA_8888);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DITHER);

setContentView(R.layout.splashscreen);

 
       // 
       Display the current version number 
       
 
       PackageManager pm  
       = 
        getPackageManager();
 
       try 
        {
PackageInfo pi  
       = 
        pm.getPackageInfo( 
       " 
       org.wordpress.android 
       " 
       ,  
       0 
       );
TextView versionNumber  
       = 
        (TextView) findViewById(R.id.versionNumber);
versionNumber.setText( 
       " 
       Version  
       " 
       + 
        pi.versionName);
}  
       catch 
        (NameNotFoundException e) {
e.printStackTrace();
}

 
       new 
        Handler().postDelayed( 
       new 
        Runnable() {
 
       public 
       void 
        run() {
 
       /* 
        Create an Intent that will start the Main WordPress Activity.  
       */ 
       
Intent mainIntent  
       = 
       new 
        Intent(splashScreen. 
       this 
       , wpAndroid. 
       class 
       );
splashScreen. 
       this 
       .startActivity(mainIntent);
splashScreen. 
       this 
       .finish();
}
},  
       2900 
       );  
       // 
       2900 for release 
       
 
       
}
}•  splashscreen.xml
<!-- 
       
android:gravity是对元素本身说的,元素本身的文本显示在什么地方靠着换个属性设置,不过不设置默认是在左侧的。
android:layout_gravity是相对与它的父元素说的,说明元素显示在父元素的什么位置
 
       --> 
       
 
       < 
       LinearLayout  
       android:id 
       ="@+id/LinearLayout01" 
       
android:layout_width 
       ="fill_parent" 
       
android:layout_height 
       ="fill_parent" 
       
xmlns:android 
       ="http://schemas.android.com/apk/res/android" 
       
android:gravity 
       ="center|center" 
       
android:background 
       ="@drawable/home_gradient" 
       
android:orientation 
       ="vertical" 
       > 
       
 
       <!-- 
       
android:scaleType是控制图片如何resized/moved来匹对ImageView的size
CENTER_INSIDE / centerInside 将图片的内容完整居中显示,通过按比例缩小或原来的size使得图片长/宽等于或小于View的长/宽
 
       --> 
       
 
       < 
       ImageView  
       android:layout_marginTop 
       ="-60dip" 
       
android:paddingLeft 
       ="20dip" 
       
android:paddingRight 
       ="20dip" 
       
android:scaleType 
       ="centerInside" 
       
android:layout_width 
       ="wrap_content" 
       
android:layout_height 
       ="wrap_content" 
       
android:id 
       ="@+id/wordpress_logo" 
       
android:src 
       ="@drawable/wordpress_home" 
       > 
       
 
       </ 
       ImageView 
       > 
       
 
       <!-- 
       
android:typeface 字体风格
 
       --> 
       
 
       < 
       TextView  
       android:text 
       ="@+id/TextView01" 
       
android:layout_width 
       ="wrap_content" 
       
android:layout_height 
       ="wrap_content" 
       
android:layout_marginTop 
       ="20dip" 
       
android:typeface 
       ="serif" 
       
android:shadowDx 
       ="0" 
       
android:shadowDy 
       ="2" 
       
android:shadowRadius 
       ="1" 
       
android:shadowColor 
       ="#FFFFFF" 
       
android:textColor 
       ="#444444" 
       
android:textSize 
       ="20dip" 
       
android:id 
       ="@+id/versionNumber" 
       
android:gravity 
       ="bottom" 
       > 
       
 
       </ 
       TextView 
       > 
       
 
       </ 
       LinearLayout 
       >