使用Handler实现延迟跳转界面

public class HelloActivity extends AppCompatActivity {
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            if (msg.what==1){
                startActivity(new Intent(HelloActivity.this,MainActivity2.class));
                finish();
            }
        }
    };
    protected void onCreate(Bundle savedInstanceState) {
        ......
    }
}