Java android studio启动屏幕后的白色屏幕
概述- 每次启动应用程序时,启动活动后都会出现一个白色屏幕,我尝试了许多解决方案,但都没有成功。如果有人知道解决方案,请帮助! 谢谢 清单文件-Java android studio启动屏幕后的白色屏幕,java,android,Java,Android,概述- 每次启动应用程序时,启动活动后都会出现一个白色屏幕,我尝试了许多解决方案,但都没有成功。如果有人知道解决方案,请帮助! 谢谢 清单文件- <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name"
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:usesCleartextTraffic="true">
<activity android:name=".splash_activity"
android:theme="@style/AppTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".MainActivity"></activity>
</application>
XML文件-
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="android:windowDisablePreview">true</item>
<item name="android:windowBackground">@null</item>
<item name="android:windowIsTranslucent">true</item>
</style>
</resources>
在这里输入代码-
Main activity-
package com.cnc.cncapp;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
private WebView mywebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebView=(WebView) findViewById(R.id.webview);
mywebView.setWebViewClient(new WebViewClient());
mywebView.loadUrl("https://www.cncrooms.in/");
WebSettings webSettings=mywebView.getSettings();
webSettings.setJavaScriptEnabled(true);
}
public class mywebClient extends WebViewClient{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon){
super.onPageStarted(view,url,favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view,String url){
view.loadUrl(url);
return true;
}
}
@Override
public void onBackPressed(){
if(mywebView.canGoBack()) {
mywebView.goBack();
}
else{
super.onBackPressed();
}
}
}
主活动布局文件
另外,发布你的MainActivity.java
classPost你的布局文件我已经添加了布局和主活动文件,你到底期望什么,另一个活动正在打开,但没有加载url,还是根本没有打开?白屏是停留很长时间还是几秒钟?应用程序是否挂起(提示用户等待或关闭)?您是否有互联网权限?是的,问题是白色屏幕停留时间长,是的,我有互联网permissions@Thompsonspartaalso,发布你的MainActivity.java
classPost你的布局文件我已经添加了布局和主活动文件,你到底期望什么,另一个活动正在打开,但没有加载url,还是根本没有打开?白色屏幕是停留很长时间还是几秒钟?应用程序是否挂起(提示用户等待或关闭)?您是否有互联网权限?是的,问题是白色屏幕停留时间长,是的,我有互联网permissions@Thompsonsparta
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="android:windowDisablePreview">true</item>
<item name="android:windowBackground">@null</item>
<item name="android:windowIsTranslucent">true</item>
</style>
</resources>
enter code here-
java file-
package com.cnc.cncapp;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
public class splash_activity extends AppCompatActivity {
private Handler mHandler;
private Runnable mRunnable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash_activity);
mRunnable = new Runnable() {
@Override
public void run() {
startActivity(new Intent(getApplicationContext(),MainActivity.class));
}
};
mHandler = new Handler();
mHandler.postDelayed(mRunnable,2000);
}
@Override
protected void onDestroy() {
super.onDestroy();
if(mHandler!=null && mRunnable!=null){
mHandler.removeCallbacks(mRunnable);
}
}
}
Main activity-
package com.cnc.cncapp;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
private WebView mywebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebView=(WebView) findViewById(R.id.webview);
mywebView.setWebViewClient(new WebViewClient());
mywebView.loadUrl("https://www.cncrooms.in/");
WebSettings webSettings=mywebView.getSettings();
webSettings.setJavaScriptEnabled(true);
}
public class mywebClient extends WebViewClient{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon){
super.onPageStarted(view,url,favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view,String url){
view.loadUrl(url);
return true;
}
}
@Override
public void onBackPressed(){
if(mywebView.canGoBack()) {
mywebView.goBack();
}
else{
super.onBackPressed();
}
}
}
enter code here-
layout file-
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
android:background="#000000"
tools:context=".splash_activity">
<ImageView
android:layout_width="228dp"
android:layout_height="209dp"
android:layout_marginStart="91dp"
android:layout_marginLeft="91dp"
android:layout_marginTop="261dp"
android:layout_marginEnd="92dp"
android:layout_marginRight="92dp"
android:layout_marginBottom="261dp"
android:src="@drawable/rsz_sitelogo"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</ImageView>
</androidx.constraintlayout.widget.ConstraintLayout>
enter code here
Main Activity layout file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
<WebView
android:id="@+id/webview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>