启动页

AndroidManifest.xml

 <activity android:name=".splash">

xml
android:background=""

java

public class splash extends AppCompatActivity {
//设置等待时间，单位为毫秒
private final int SPLASH_DISPLAY_LENGHT=2000;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //加载启动页面
    setContentView(R.layout.activity_splash);
    //当计时结束时，跳转至主界面
    new Handler().postDelayed(new Runnable(){
        @Override
        public void run(){
            Intent mainIntent=new Intent(splash.this,MainActivity.class);
            splash.this.startActivity(mainIntent);
            splash.this.finish();
        }
    },SPLASH_DISPLAY_LENGHT);
}
}