今天來做個簡單的東西，會使用TimePickerDialog，利用TextView顯示出時間。
activity_main.xml設置

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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/time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/puttime"
        android:layout_alignParentEnd="true"
        android:layout_marginEnd="160dp"
        android:layout_marginBottom="10dp"
        android:text="設置時間"
        android:textSize="40sp" />
    <EditText
        android:id="@+id/puttime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button"
        android:layout_marginLeft="100dp"
        android:layout_marginTop="100dp"
        android:layout_marginBottom="100dp"
        android:ems="10"
        android:hint="Enter Time" />
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="100dp"
        android:layout_marginEnd="160dp"
        android:layout_marginBottom="300dp"
        android:text="click" />

</RelativeLayout>

MainActivity程式設計

public class MainActivity extends AppCompatActivity {
//宣告物件
    private TextView time;
    private Button button;
    private EditText puttime;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //點擊監聽EditText
        puttime.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            
                Calendar calendar=Calendar.getInstance();
                int hour=calendar.get(Calendar.HOUR_OF_DAY);
                int min=calendar.get(Calendar.MINUTE);
                //新增TimePickerDialog，設定點擊監聽
               TimePickerDialog timePickerDialog= new TimePickerDialog(MainActivity.this,
                        new TimePickerDialog.OnTimeSetListener() {
                            @Override
                            public void onTimeSet(TimePicker view, int hour, int min) {
                            //EditText顯示時間
                                puttime.setText(hour+":"+min);
                            }
                        }
                        , hour,min,true);
                        //記得show出來喔
                timePickerDialog.show();
            }
        });
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
            //TextView顯示puttime獲取的文字
                time.setText(puttime.getText());
            }
        });
    }
    private void init() {
        time = (TextView) findViewById(R.id.time);
        puttime = (EditText) findViewById(R.id.puttime);
        button = (Button) findViewById(R.id.button);
    }
}

成果圖