Android TextView運用postdelayed持續更新當前時間

執行結果：

程式碼：

package com.example.cyfang.post;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class MainActivity extends AppCompatActivity {
    private TextView textView;

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

    private void init() {
        textView = (TextView) findViewById(R.id.textview);
        textView.postDelayed(runnable, 1000);
    }

    private Runnable runnable = new Runnable() {
        @Override
        public void run() {
            textView.setText(new SimpleDateFormat("yyyyMMdd HH:mm:ss").format(Calendar.getInstance().getTime()));
            textView.postDelayed(runnable, 1000);
        }
    };

    @Override
    protected void onPause() {
        super.onPause();
        textView.removeCallbacks(runnable);
    }
}