Handler倒计时

public class MainActivity extends BaseActivity {

    private TextView tiao;
    private SharedPreferences sp;
    private int time=5;
    @Override
    public int bindLayout() {
        return R.layout.activity_main;
    }

    @Override
    protected void initView() {
        tiao = findViewById(R.id.tiao);
        sp = getSharedPreferences("dao",Context.MODE_PRIVATE);
    }

    @Override
    protected void initData() {
        if (sp.getBoolean("登录",false)){
            startActivity(new Intent(MainActivity.this,ShowActivity.class));
            handler.removeCallbacksAndMessages(null);
            finish();
            return;
        }
        handler.sendEmptyMessageDelayed(0,1000);
    }

    @Override
    protected void bindEvent() {

        tiao.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SharedPreferences.Editor editor=sp.edit();
                editor.putBoolean("登录",true);
                editor.commit();
                startActivity(new Intent(MainActivity.this,ShowActivity.class));
                handler.removeCallbacksAndMessages(null);
                finish();
                return ;
            }
        });
    }

    Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 0:
                    if (time>0){
                        time--;
                        tiao.setText("跳转:"+time+"S");
                        handler.sendEmptyMessageDelayed(0,1000);
                    }else{
                        SharedPreferences.Editor editor=sp.edit();
                        editor.putBoolean("登录",true);
                        editor.commit();
                        startActivity(new Intent(MainActivity.this,ShowActivity.class));
                        handler.removeCallbacksAndMessages(null);
                        finish();
                    }
                    break;
            }

        }
    };
}