java - Android 网页 View : Splash screen while loading a url

Question

我是 Android 应用程序的新手，这是我的第一个应用程序。我已经创建了启动屏幕并且可以工作..但是在它消失后，会出现一个长长的白色空白屏幕，大约 2-5 秒，然后 url 开始加载..

我的问题是..如何在加载 URL 时在启动屏幕中制作一些加载或进度条？所以不再有白色的空白屏幕。抱歉我的英语不好。

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.xxx.xxx" >

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />


<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="xxx"
    android:theme="@style/AppTheme"
    android:hardwareAccelerated="true" />


    <activity
        android:name="com.xxx.xxx.Splash"
        android:label="xxx"
        android:theme="@style/Theme.MyAppTheme" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MyActivity"
        android:hardwareAccelerated="true"
        android:configChanges="orientation|screenSize"
        android:label="xxx" >

    </activity>

</application>

</manifest>

activity_my.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".MyActivity">

    <WebView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/webView"
        android:layout_gravity="center"
        />

<TextView
    android:id="@+id/display"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:visibility="gone"
     />

<FrameLayout
        android:id="@+id/customViewContainer"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"/>
</LinearLayout>    

Splash.java

    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.os.Handler;

public class Splash extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splashscreen);

    final Handler handel = new Handler();
    handel.postDelayed(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            Intent loadSplash = new Intent(Splash.this, MyActivity.class);

            startActivity(loadSplash);

            finish();
            }
        }, 3000);
    }
}

splashscreen.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff" >

<ImageView
android:id="@+id/imageView1"

    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:src="@drawable/splash" />

</RelativeLayout>

Answer 1

不要将启动屏幕创建为单独的 Activity 。在您的 WebView Activity (即页面加载 Activity )上添加启动功能。监听 onPageFinished 事件并隐藏启动图像或动画。

mWebView.setWebViewClient(new WebViewClient() {

   public void onPageFinished(WebView view, String url) {
        //hide splash functionality
    }
});

如果您想显示进度条，您还可以获取页面加载进度

mWebView.setWebChromeClient(new WebChromeClient() {
                public void onProgressChanged(WebView view, int progress) 
                   {
                   if(progress < 100 && Pbar.getVisibility() == ProgressBar.GONE){
                       Pbar.setVisibility(ProgressBar.VISIBLE);
                   }
                   Pbar.setProgress(progress);
                   if(progress == 100) {
                       Pbar.setVisibility(ProgressBar.GONE);
                   }
                }
            });