在片段中删除 SetContentView 后倒计时时间不起作用

Question

我制作了一个倒数计时器，包含天、小时、分钟和秒。当用作 Activity 时，它工作正常，但现在我必须将它放在一个片段中，我不能使用 SetContentView。我如何让它继续工作？任何帮助表示赞赏。谢谢！

这是我的代码：

    public class FragmentOne extends Fragment {

    private TextView tvDay, tvHour, tvMinute, tvSecond, tvEvent;
    private LinearLayout linearLayout1, linearLayout2;
    private Handler handler;
    private Runnable runnable;

    public static Fragment newInstance(Context context) {
        FragmentOne f = new FragmentOne();
        return f;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment_one, container,false);
        linearLayout1 = (LinearLayout) getActivity().findViewById(R.id.ll1);
        linearLayout2 = (LinearLayout) getActivity().findViewById(R.id.ll2);
        tvDay = (TextView) getActivity().findViewById(R.id.txtTimerDay);
        tvHour = (TextView) getActivity().findViewById(R.id.txtTimerHour);
        tvMinute = (TextView) getActivity().findViewById(R.id.txtTimerMinute);
        tvSecond = (TextView) getActivity().findViewById(R.id.txtTimerSecond);
        tvEvent = (TextView) getActivity().findViewById(R.id.tvevent);
        handler = new Handler();
        runnable = new Runnable() {
            @Override
            public void run() {
                handler.postDelayed(this, 1000);
                try {
                    SimpleDateFormat dateFormat = new SimpleDateFormat(
                            "yyyy-MM-dd");
                    Date futureDate = dateFormat.parse("2016-2-19");
                    Date currentDate = new Date();
                    if (!currentDate.after(futureDate)) {
                        long diff = futureDate.getTime()
                                - currentDate.getTime();
                        long days = diff / (24 * 60 * 60 * 1000);
                        diff -= days * (24 * 60 * 60 * 1000);
                        long hours = diff / (60 * 60 * 1000);
                        diff -= hours * (60 * 60 * 1000);
                        long minutes = diff / (60 * 1000);
                        diff -= minutes * (60 * 1000);
                        long seconds = diff / 1000;
                        tvDay.setText("" + String.format("%02d:", days));
                        tvHour.setText("" + String.format("%02d:", hours));
                        tvMinute.setText("" + String.format("%02d:", minutes));
                        tvSecond.setText("" + String.format("%02d", seconds));
                    } else {
                        linearLayout1.setVisibility(View.VISIBLE);
                        linearLayout2.setVisibility(View.GONE);
                        tvEvent.setText("Event Start");
                        handler.removeCallbacks(runnable);
                        handler.removeMessages(0);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };
        handler.postDelayed(runnable, 0);
        return root;
    } 
}

和我的 XML 一样：

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@drawable/background" > 

      <LinearLayout
     android:id="@+id/ll1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_centerHorizontal="true"
     android:layout_marginTop="10dp"
     android:background="#FFFFFF"
     android:gravity="center|center_horizontal|center_vertical"
     android:orientation="horizontal"
     android:visibility="gone" >

        <TextView
            android:id="@+id/tvevent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal|center_vertical"
            android:singleLine="true"
            android:text="Android Event Start"
            android:textColor="#fff"
            android:textSize="24sp"
            android:textStyle="bold" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/ll2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_gravity="center"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="10dp"
        android:background="#00000000"
        android:gravity="center|center_horizontal|center_vertical"
        android:orientation="horizontal"
        android:visibility="visible" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#00FFFFFF"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/txtTimerDay"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:gravity="center"
                android:text="00:"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:textColor="#fff" 
                android:textSize="50sp"/>
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#00FFFFFF"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/txtTimerHour"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:gravity="center"
                android:text="00:"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:textColor="#fff" 
                android:textSize="50sp"/>
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#00FFFFFF"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/txtTimerMinute"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:gravity="center"
                android:text="00:"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:textColor="#fff"
                android:textSize="50sp" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#00FFFFFF"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/txtTimerSecond"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="3"
                android:gravity="center"
                android:text="00"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:textColor="#fff"
                android:textSize="50sp" />
        </LinearLayout>
    </LinearLayout>



</RelativeLayout>

Answer 1

but now I have to put this in a fragment and I cannot use SetContentView

getActivity() return Activity 上下文并使用 getActivity 调用 findViewById 意味着从 Activity 布局访问视图而不是片段 return来自 onCreateView 方法。

因此，要使其正常工作，请使用 root 而不是 getActivity() 从 Fragment 布局访问视图：

linearLayout1 = (LinearLayout) root.findViewById(R.id.ll1);

访问其他视图也是如此。

Answer 2

用这个替换 getActivity() -

     ViewGroup root = (ViewGroup) inflater.inflate(R.layout.fragment_one, container,false);
     linearLayout1 = (LinearLayout) root.findViewById(R.id.ll1);
......................

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