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
>