android studio3.1 添加闪屏页面（启动欢迎界面）（例子简单无BUG）

截图

启动页的

activity_splash.xml 

我用了一张图片自己添加吧

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/activity_splash"
    tools:context=".SplashActivity"
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
    android:background="@mipmap/diyi">

</RelativeLayout>

manifest 定义

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.stdu">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".SplashActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity" />
    </application>

</manifest>

SplashActivity.javpackage com.stdu;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.RelativeLayout;

public class SplashActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().hide();
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//AS下全屏隐藏标题栏代码
        setContentView(R.layout.activity_splash);
        RelativeLayout laoutsplsh=findViewById(R.id.activity_splash);
        AlphaAnimation alphaAnimation =new AlphaAnimation(0.1f,1.0f);
        alphaAnimation.setDuration(2200);
        laoutsplsh.startAnimation(alphaAnimation);
        alphaAnimation.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {

            }

            @Override
            public void onAnimationEnd(Animation animation) {
                Intent intent=new Intent(SplashActivity.this,MainActivity.class);
                //intent.setClass(getApplicationContext(),MainActivity.class).setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                //把那个MainActivity设置为栈底    意思就是防止你按返回键的时候返回到哪个启动欢迎界面

                startActivity(intent);//载入主窗口
　　　　　　　　　　finish();
            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }
        });

    }
}

　　mainactivity.java

package com.stdu;
        import android.support.v7.app.AppCompatActivity;
        import android.os.Bundle;
        import android.view.Window;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);


    }
}

安卓studio 遇到的问题 ，eclipse下取消标题栏的问题再安卓studio下无法取消 ，以及点击返回按钮 会返回到启动页面的问题 例子中都已经解决