如何在android中显示闪屏

public class SplashActivity extends AppCompatActivity {

    private static final int SPLASH_DELAY = 2000; // 闪屏展示时间(ms)

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);

        // 设置闪屏界面背景等
        // ...

        // 延时跳转到主界面
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                startMainActivity();
            }
        }, SPLASH_DELAY);
    }

    private void startMainActivity() {
        Intent intent = new Intent(this, MainActivity.class);
        startActivity(intent);
        finish(); // 结束当前Activity
    }
}

<activity android:name=".SplashActivity">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>