我正在构建app.in,我希望将我的布局从上午8点隐藏到上午12点。我尝试使用线程和asynctask,但我不明白如何给出8到12之间的时间段。
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="40dp"
android:layout_height="50dp"
android:layout_marginLeft="3dp"
android:scaleType="centerCrop"
android:src="@drawable/vegitables"
app:civ_border_color="#80000000"
app:civ_border_width="1dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="5dp"
android:text="Veg :"
android:textColor="#F00"
android:textSize="18sp"
android:textStyle="bold" />
</LinearLayout>
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="150dp"/>
</LinearLayout>
答案 0 :(得分:2)
试试这个:
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答案 1 :(得分:0)
首先,上午12点意味着午夜,而12点意味着中午。我假设你是中午,但这个解决方案很容易改变到任何时间边界。
您可以在活动中添加以下内容:
public class MyActivity extends AppCompatActivity {
private Handler handler;
private View layout;
private Runnable updateVisibilityCallback;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_activity);
handler = new Handler(Looper.getMainLooper());
layout = findViewById(R.id.layout);
updateVisibilityCallback = new Runnable() {
@Override
public void run() {
updateTextVisibility();
}
};
}
@Override
protected void onResume() {
super.onResume();
updateTextVisibility();
}
@Override
protected void onPause() {
super.onPause();
handler.removeCallbacks(updateVisibilityCallback);
}
private void updateTextVisibility() {
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
if (8 <= hour && hour <= 11) {
layout.setVisibility(View.GONE);
} else {
layout.setVisibility(View.VISIBLE);
}
handler.postDelayed(updateVisibilityCallback, getVisibilityUpdateDelay());
}
private long getVisibilityUpdateDelay() {
Calendar rightNow = Calendar.getInstance();
int hour = rightNow.get(Calendar.HOUR_OF_DAY);
Calendar nextUpdate = Calendar.getInstance();
nextUpdate.set(Calendar.MINUTE, 0);
nextUpdate.set(Calendar.SECOND, 0);
nextUpdate.set(Calendar.MILLISECOND, 0);
if (hour < 8) {
nextUpdate.set(Calendar.HOUR_OF_DAY, 8);
} else if (hour < 12) {
nextUpdate.set(Calendar.HOUR_OF_DAY, 12);
} else {
nextUpdate.add(Calendar.DATE, 1);
nextUpdate.set(Calendar.HOUR_OF_DAY, 8);
}
return nextUpdate.getTimeInMillis() - rightNow.getTimeInMillis();
}
}
每次活动对用户可见时(在onResume
中),您都会检查时间并更新布局的可见性。此外,您可以跟踪下次更新的时间 - 计算延迟时间为8:00或12:00,并使用Runnable
发布Handler
。只要您的用户停止关注活动,您就可以清除回调。