Question

我试图在Google地图视图上显示ProgressBar。如果我在布局编辑器中将其设置为VISIBLE，则会显示进度条，但这不是我想要的。相反，我希望它为INVISIBLE，并在后台加载内容时使其可见。但是，进度条保持隐藏状态。

布局如下：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools"
            android:layout_height="match_parent"
            android:layout_width="match_parent"
            android:orientation="vertical">

    <!-- Google Maps view -->
    <view
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        class="com.google.android.gms.maps.MapView"
        android:id="@+id/mapView"
        android:background="#ddd"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:visibility="visible"/>

    <!-- The progress bar to show when stuff is loading in background -->
    <ProgressBar
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/pbLoading"
        android:indeterminate="true"
        android:progress="0"
        android:visibility="invisible"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"/>

</RelativeLayout>

与问题相关的代码是这样的：

ProgressBar m_pbLoading;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
    View view = inflater.inflate(R.layout.fragment_map, container, false);
    m_pbLoading = (ProgressBar)view.findViewById(R.id.pbLoading);

    ...
}

// This gets called when stuff starts loading in the background
@Override
public void onStartLoading()
{
    Log.i(TAG, "onStartLoading()");
    m_pbLoading.setVisibility(View.VISIBLE);
    ...
}

// This gets called when stuff stops loading in the background
@Override
public void onStopLoading()
{
    Log.i(TAG, "onStopLoading()");
    m_pbLoading.setVisibility(View.INVISIBLE);
    ...
}

基本上，进度条最初设置为INVISIBLE，加载开始时，它应该显示出来。当加载停止时，它将再次被隐藏。但是，这不会发生。只有在布局中将其设置为可见时，才会显示进度条。

Answer 1

您是否尝试在单独的UI线程中添加setVisibility。

 public void run() {  
    runOnUiThread(new Runnable() { 
        public void run() 
        { 
          //Setvisibility method
        } 
    }); 
}

Answer 2

试试

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:orientation="vertical">
<!-- The progress bar to show when stuff is loading in background -->
<ProgressBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/pbLoading"
    android:indeterminate="true"
    android:progress="0"
    android:visibility="gone"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"/>

<!-- Google Maps view -->
<view
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    class="com.google.android.gms.maps.MapView"
    android:id="@+id/mapView"
    android:background="#ddd"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:visibility="visible"/>



</RelativeLayout>

和

@Override
public void onStartLoading()
{
    Log.i(TAG, "onStartLoading()");
    m_pbLoading.setVisibility(View.VISIBLE);
    ...
}

// This gets called when stuff stops loading in the background
@Override
public void onStopLoading()
{
    Log.i(TAG, "onStopLoading()");
    m_pbLoading.setVisibility(View.GONE);
    ...
}

添加

或者谷歌地图视图：

@Override public void onStartLoading() { Log.i(TAG, "onStartLoading()"); GoogleMaps.setVisibility(View.GONE); m_pbLoading.setVisibility(View.VISIBLE); ... } // This gets called when stuff stops loading in the background @Override public void onStopLoading() { Log.i(TAG, "onStopLoading()"); m_pbLoading.setVisibility(View.GONE); GoogleMaps.setVisibility(View.VISIBLE); ... }

当可见性设置为VISIBLE

2 个答案: