我有activity_main.xml
,有两种版式:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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"
android:background="@color/appColor">
<android.support.constraint.ConstraintLayout
android:id="@+id/loading_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/appColor">
<ImageView
android:id="@+id/imageView"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="@mipmap/ic_launcher"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:contentDescription="" />
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
app:layout_constraintEnd_toEndOf="@+id/imageView"
app:layout_constraintStart_toStartOf="@+id/imageView"
app:layout_constraintTop_toBottomOf="@+id/imageView"
android:indeterminateTint="@color/white"
android:indeterminateTintMode="src_in"/>
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout
android:id="@+id/webview_layout"
android:visibility="gone"
android:background="@color/appColor"
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/appColor"/>
</android.support.constraint.ConstraintLayout>
首先,我显示loading_layout
,当我加载完应用程序后,显示webview_layout
:
ConstraintLayout loadingLayout;
ConstraintLayout webviewLayout;
WebView webview;
String kAppUrl = "*******";
String kDefaultAppUrl = "******";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.activity_main);
loadingLayout = (ConstraintLayout)findViewById(R.id.loading_layout);
webviewLayout = (ConstraintLayout)findViewById(R.id.webview_layout);
webview = (WebView)findViewById(R.id.webView);
webview.clearCache(true);
webview.clearHistory();
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
startLoadingUrlFromServer();
}
private void startLoadingUrlFromServer() {
RequestQueue queue = Volley.newRequestQueue(this);
StringRequest stringRequest = new StringRequest(Request.Method.GET, kAppUrl,
new Response.Listener<String>() {
@Override
public void onResponse(final String response) {
runOnUiThread(new Runnable() {
@Override
public void run() {
finishLoadindDataFromServerWithData(response);
}
});
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
runOnUiThread(new Runnable() {
@Override
public void run() {
openWebSite(null);
}
});
}
});
queue.add(stringRequest);
}
private void finishLoadindDataFromServerWithData(String response) {
if (response == null || response.equals("")) {
openWebSite(null);
return;
}
if (!response.startsWith("http://") && !response.startsWith("https://")) {
openWebSite(null);
return;
}
openWebSite(response);
}
private void openWebSite(String url) {
loadingLayout.setVisibility(View.GONE);
webviewLayout.setVisibility(View.VISIBLE);
if (url == null || url.equals("")) {
webview.loadUrl(kDefaultAppUrl);
} else {
webview.loadUrl(url);
}
}
当我将loadingLayout
的可见性设置为GONE
并将webviewLayout
设置为VISIBLE
时,应用程序具有白色背景两秒钟的问题,可以改变背景颜色吗?
答案 0 :(得分:0)
看起来两秒钟内找到的颜色是应用程序主题背景。
转到您的AndroidManifest.xml
文件并打开您的Application
标签具有的主题(如果在Activity标签中定义了另一个主题,请打开该主题)。
这应该打开您的styles.xml
文件。将item
的新windowBackground
添加到您的AppTheme
(假设这是您的主题名称),这会将白色背景颜色更改为定义的背景颜色(在下面的代码中为黑色)。 / p>
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="android:Theme.Holo.NoActionBar">
<item name="android:windowBackground">@android:color/black</item>
...
..
.
</style>
</resources>