瑕佸疄鐜癟extClock鑷姩鏇存柊鏃堕棿锛屽彲浠ヤ娇鐢℉andler鍜孯unnable鏉ュ畾鏃舵洿鏂癟extClock鐨勬椂闂淬€傚叿浣撴楠ゅ涓嬶細

1. 鍒涘缓涓€涓狧andler瀵硅薄锛岀敤鏉ュ畾鏃舵洿鏂版椂闂淬€?/li>
2. 鍦ˋctivity鐨刼nCreate鏂规硶涓垵濮嬪寲Handler锛屽湪Handler涓垱寤轰竴涓猂unnable瀵硅薄锛岀敤鏉ユ洿鏂癟extClock鐨勬椂闂淬€?/li>
3. 鍦≧unnable瀵硅薄涓娇鐢╬ostDelayed鏂规硶鏉ュ欢鏃舵洿鏂版椂闂达紝鐒跺悗鍐嶆璋冪敤鑷韩鏉ュ疄鐜板惊鐜洿鏂版椂闂寸殑鏁堟灉銆?/li>
4. 鍦ˋctivity鐨刼nResume鏂规硶涓惎鍔ㄦ洿鏂版椂闂寸殑鍔熻兘锛屽湪onPause鏂规硶涓仠姝㈡洿鏂版椂闂寸殑鍔熻兘锛屼互閬垮厤鍦ˋctivity涓嶅彲瑙佹椂娴垂璧勬簮銆?/li>

绀轰緥浠ｇ爜濡備笅锛?/p>

public class MainActivity extends AppCompatActivity {

    private Handler mHandler;

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

        final TextClock textClock = findViewById(R.id.textClock);
        
        mHandler = new Handler();
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                textClock.setText(new SimpleDateFormat("HH:mm:ss").format(new Date()));
                mHandler.postDelayed(this, 1000); // 姣忕鏇存柊涓€娆℃椂闂?/span>
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        mHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                mHandler.postDelayed(this, 1000);
            }
        }, 1000);
    }

    @Override
    protected void onPause() {
        super.onPause();
        mHandler.removeCallbacksAndMessages(null);
    }
}

浠ヤ笂浠ｇ爜浼氬湪姣忕鏇存柊TextClock鐨勬椂闂淬€?/p>