倒计时

handler倒计时

    private int count = 5;

    private Handler handler = new Handler(new Handler.Callback() {
        @Override
        public boolean handleMessage(@NonNull Message msg) {
            tv_num.setText("倒计时：" + count);
            if (count == 0) {
                Intent intent = new Intent(MainActivity.this, SplashActivity.class);
                startActivity(intent);
                finish();
            }
            return false;
        }
    });

    private Button btn_jump;
    private TextView tv_num;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initNum();
    }

    private void initNum() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (count > 0) {
                    try {
                        Thread.sleep(1000);
                        count--;
                        handler.sendEmptyMessage(1);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
    }

    private void initView() {
        btn_jump = (Button) findViewById(R.id.btn_jump);
        iv_splash = (ImageView) findViewById(R.id.iv_splash);
        tv_num = (TextView) findViewById(R.id.tv_num);

        btn_jump.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_jump:
                Intent intent = new Intent(MainActivity.this, SplashActivity.class);
                startActivity(intent);
                finish();
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        handler.removeMessages(1);
        if (handler != null) {
            handler = null;
        }
    }

RxJava倒计时（TianYu用不了）

    private Disposable subscribe;

    private void initNum() {
        //时间
        Long num = 3L;
        //period：隔几秒变一次
        subscribe = Observable.interval(1, TimeUnit.SECONDS)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<Long>() {
                    @Override
                    public void accept(Long aLong) throws Exception {
                        if (aLong < num && !subscribe.isDisposed()) {
                            tvSplash.setText("记录改变生活" + (num - aLong - 1));
                        } else {
                            Intent intent = new Intent(MainActivity.this, WelcomActivity.class);
                            startActivity(intent);
                            finish();
                        }
                    }
                });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        subscribe.dispose();
        subscribe = null;
    }