Android(安卓)获取验证码倒计时

public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private TextView tv_count;    private int count=60;    private Handler handler = new Handler();    private Runnable runnable;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        tv_count = (TextView) findViewById(R.id.tv_count);        tv_count.setOnClickListener(this);        runnable = new Runnable(){            @Override            public void run() {                handler.postDelayed(this, 1000);                tv_count.setText(count-- + "s");                if (count<0){                    count=60;//重新设置值  handler.removeCallbacks(this);                    tv_count.setClickable(true);                    tv_count.setText("重新获取验证码");                }            }        };    }    @Override    public void onClick(View view) {        if (view.getId()==R.id.tv_count){            handler.post(runnable);            tv_count.setClickable(false);        }    }
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