Zi 字媒體

前面一定要先加入 implements Runnable public class MainActivity extends AppCompatActivity implements Runnable{ 示範 XML xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/t1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="8dp" android:layout_marginEnd="8dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginStart="8dp" android:layout_marginTop="8dp" android:text="TextView" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> android.support.constraint.ConstraintLayout> JAVA public class MainActivity extends AppCompatActivity implements Runnable{ TextView t1; private Handler handler; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); t1=(TextView)findViewById(R.id.t1); handler = new Handler() { public void handleMessage(Message msg) { t1.setText((String)msg.obj); } }; new Thread(this).start(); } @Override public void run() { // TODO Auto-generated method stub try { while (true) { SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ssaa");//時間格式 String str = sdf.format(new Date()); handler.sendMessage(handler.obtainMessage(100, str)); Thread.sleep(1000); } } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 展示 相關文章: [Android] Android 程式設計教學