默认情况下，启动界面是白屏

我们自定义一个启动界面如下，3秒钟后进入主界面并结束启动页

SplashActivity.java

package com.bu_ish.myapp;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;public class SplashActivity extends AppCompatActivity {    private static final String TAG = SplashActivity.class.getName();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        try {            Thread.sleep(3000);        } catch (InterruptedException ex) {            Log.e(TAG, null, ex);        } finally {            startActivity(new Intent(this, MainActivity.class));            finish();        }    }}

启动界面的style如下

不要忘记在AndroidManifest中设置SplashActivity的theme为SplashTheme