因为您没有完成splash活动，所以这里有一个正确的方法来进行splash（尽管我不推荐这种方法用于splash）：

Thread thread = new Thread() {
            @Override
            public void run() {
                try {
                    int waited = 0;
                    while (waited < 5000) {
                        sleep(100);
                        waited += 100;
                    }
                    Intent intent = new Intent(SplashActivity.this, MainActivity.class);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                    startActivity(intent);
                    SplashActivity.this.finish();
                } catch (InterruptedException e) {

                } finally {
                    SplashActivity.this.finish();
                }

            }
        };
        thread.start();

请尝试以下代码：

new Handler().postDelayed(new Runnable() {

            @Override
            public void run() {
                // This method will be executed once the timer is over
                Intent i = new Intent(SplashActivity.this, MainActivity.class);
                startActivity(i);
                finish();
            }
        }, 5000);