01-创建工程及Splash界面搭建
项目使用Android Studio开发...
1.Spalsh界面搭建
界面是一个RelativeLayout显示一个背景图，我们把图片资源放到drawable-hdpi目录下（没有的话创建）
对应的activity_splash.xml为：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bkg">
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<manifest package="rain.zhihuixian"
xmlns:android="http://schemas.android.com/apk/res/android">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".SplashActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</manifest>
3、SplashActivity启动代码：
package rain.zhihuixian;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Window;
import rain.Utils.Contants;
import rain.Utils.SharedPreferencesUtil;
public class SplashActivity extends Activity {
private static final int GO_HOME = 1000;
private static final int GO_GUIDE = 1001;
//延迟三秒
private static final long SPLASH_DELAY_MILLIS = 3000;
//private static final String SHAREDPREFERENCES_NAME = "first_pref";
/**
* handler：跳转到不同界面
*/
private Handler mHandler = new Handler()
{
public void handleMessage(Message msg)
{
switch(msg.what)
{
case GO_HOME:
goHome();
break;
case GO_GUIDE:
goGuide();
break;
}
}
};
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_splash);
init();
}
private void init() {
// TODO Auto-generated method stub
Boolean isFirstIn = SharedPreferencesUtil.getBoolean(getApplicationContext(), Contants.ISFIRSTENTER, true);
//判断程序是第几次运行，如果是第一次运行则跳转到引导界面，否则跳转到主界面
if(!isFirstIn)
{
mHandler.sendEmptyMessageDelayed(GO_HOME, SPLASH_DELAY_MILLIS);
}
else
{
mHandler.sendEmptyMessageDelayed(GO_GUIDE, SPLASH_DELAY_MILLIS);
}
}
/**
* 进入引导界面
*/
private void goGuide() {
// TODO Auto-generated method stub
Intent intent = new Intent(SplashActivity.this,GuideActivity.class);
startActivity(intent);
finish();
}
/**
* 进入主界面
*/
private void goHome() {
// TODO Auto-generated method stub
Intent intent = new Intent(SplashActivity.this,HomeActivity.class);
startActivity(intent);
finish();
}
}
3.1、判断用户是否第一次进入应用程序，我们使用SharedPreferences储存数据状态，我们将其抽取到一个工具类中
放到rain-Utils-SharedPreferencesUtil.java
<span style="color:#333333;">package rain.Utils; import android.content.Context; import android.content.SharedPreferences; /** * Created by:Rain on 2016/2/20 19:13 * E-mail: [email protected] * Url: http://blog.csdn.net/sinat_33680954 * 签名: 通过改变自我适应万变的世界 ---Rain */ public class SharedPreferencesUtil { private static SharedPreferences sp; /** * 保存boolean值操作 * @param context * @param key * @param value */ public static void saveBoolean(Context context , String key , boolean value){ if (sp == null){ sp = context.getSharedPreferences("config",Context.MODE_PRIVATE); } sp.edit().putBoolean(key, value).commit(); } /** * 获取保存的boolean值操作 * @param context * @param key * @param value */ public static Boolean getBoolean(Context context, String </span><span style="color:#ff0000;">key</span><span style="color:#333333;">, boolean value){ if (sp == null){ sp = context.getSharedPreferences("config",Context.MODE_PRIVATE); } return sp.getBoolean(key,value); } }</span><span style="color:#a9b7c6;"> </span>
3.1、将所需的key保存到接口rain-Utils-Cotants.java
package rain.Utils; /** * Created by:Rain on 2016/2/20 19:29 * E-mail: [email protected] * Url: http://blog.csdn.net/sinat_33680954 * 签名: 通过改变自我适应万变的世界 ---Rain */ public interface Contants { /** * 应用程序是否第一次打开 */ public static final String ISFIRSTENTER = "isfirstenter"; }
4、运行效果图
注：下一篇我们将实现引导界面GuideActivity及布局的搭建