Question

如何延迟在android studio中显示元素我有2个ImageView

<ImageView
            android:id="@+id/a_letter"
            android:background="#00000000"
            android:layout_centerVertical="true"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingTop="100dp"
            app:srcCompat="@drawable/a_letter"
            />

和

<ImageView
            android:id="@+id/b_letter"
            android:background="#00000000"
            android:layout_centerVertical="true"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:paddingTop="100dp"
            app:srcCompat="@drawable/b_letter"
            />

如果在打开布局时首先加载ImageView a_letter加载ImageView b_letter，请在<?php if(mysqli_num_rows($check_ip) > 0 ) { ?> <script type="text/javascript"> $(document).ready(function() { $("#myModal").modal('show'); }); </script> <?php } ?>之前延迟3秒显示<div id="myModal" class="modal"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button> <h4 class="modal-title">Welcome back! Here's our recommended speakers for you.</h4> </div> <div class="modal-body"> <?php $user_ip = $_SERVER['REMOTE_ADDR']; $check_ip = mysqli_query($conn, "SELECT ip_address FROM reservations WHERE ip_address = '$user_ip'"); $history_data = mysqli_query($conn, "SELECT * FROM reservations WHERE ip_address = '$user_ip'"); $row = mysqli_fetch_array($history_data); $topic = $row['topic']; $ip_address = $row['ip_address']; $select_speakers = mysqli_query($conn, "SELECT * FROM speakers WHERE speaker_specialization1 = '$topic' OR speaker_specialization2 = '$topic' OR speaker_specialization3 = '$topic' ORDER BY speaker_reservedcount DESC LIMIT 3"); while($row = mysqli_fetch_array($select_speakers)) { echo ' <a href="speakerProfile.php?id='.$row["id"].'"> <div class=" col-sm-4 "> <div class="thumbnail"><img class="speakers-image" src="img/'.$row["speaker_image"].'" style="height:150px; min-width:100%;"/> <div class="caption" style="max-height:270px; min-width:100%" > <center> <h3 class="speakers-name" style="font-weight:bold; margin: 2px 10px -6px 10px;">'.$row["speaker_fullname"].'</h3> <hr> <div class="speaker-topics" style="margin-top:-20px;"> <p style="text-transform: capitalize;">'.$row["speaker_specialization1"].'</p> </div> <div class="speaker-topics"> <p style="text-transform: capitalize;">'.$row["speaker_specialization2"].'</p> </div> <div class="speaker-topics"> <p style="text-transform: capitalize;">'.$row["speaker_specialization3"].'</p> </div> <hr> <p class="speakers-name" style="margin:-10px 0px 5 px 0px;">Reserved Count: '.$row["speaker_reservedcount"].'</p> </center> </div> </div> </div> </a> '; } ?> </div> </div> </div> </div>的 ID ？

这是一个转变吗？

Answer 1

首先通过添加：

使图像视图在xml中消失

<ImageView
    android:id="@+id/b_letter"
    android:background="#00000000"
    android:layout_centerVertical="true"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="100dp"
    app:srcCompat="@drawable/b_letter"
    android:visibility="gone"/>

然后使用Handler：

ImageView bImageView = (ImageView) findViewById(R.id.b_letter);
new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
        bImageView.setVisibility(View.VISIBLE);
    }
}, 3000);

显示延迟元素

1 个答案: