Android Webview：加载url时出现闪屏

Question

我是Android应用程序中的新手，这是我的第一个应用程序。 我已经创建了启动画面和工程..但其后走了一个长长的白色空白屏幕约2-5秒，然后URL开始加载..

而我的问题是..如何使一些加载或进度加载网址时在启动画面中显示吧？所以没有更多的白色黑屏。对不起，我的英语不好。

的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Splash屏幕创建为单独的活动。在您的WebView活动中添加启动功能，即您的页面加载活动。收听onPageFinished事件并隐藏飞溅图像或动画。

mWebView.setWebViewClient(new WebViewClient() { 

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

有了这个，你还可以得到页面加载进度，如果你想显示一个进度条

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); 
        } 
       } 
      }); 

Answer 2

这里是如何做到这一点 -

wv.setWebViewClient(new WebViewClient() { 
     @Override 
     public void onPageFinished(WebView view, String url) { 
      //hide loading image 
      findViewById(R.id.imageLoading1).setVisibility(View.GONE); 
      //show webview 
      findViewById(R.id.webView1).setVisibility(View.VISIBLE); 
     } 
    });  

    wv.loadUrl("http://yoururlhere.com"); 

你可以找到完整示例在这里 - Splash Screen While Loading a URL

Answer 3

您可以使用AsyncTask &将该加载URL代码放入AsyncTask &使用进度条来查看进度。

帮助链接：

For AsyncTask

For ProgressBar

我希望这可以帮助您。

Answer 4

在这里你去..作为Jibran Khan说，不要创建单独的飞溅活动。在你的webview上使用启动功能。首先，通过为WebViewClient扩展创建WebClient类，你会得到未实现的方法，如this`

{ 
    @Override 
    public boolean shouldOverrideUrlLoading(WebView view, String url) { 
     view.loadUrl(url); 
     return true; 
    } 

    @Override 
    public void onLoadResource(WebView view, String url) { 

    } 

    public void onPageStarted(WebView view, String url, Bitmap favicon) { 
     progressBar1.setVisibility(View.VISIBLE); 
     webview.setVisibility(View.GONE); 
     super.onPageStarted(view, url, favicon); 
    } 

    public void onPageFinished(WebView view, String url) { 
     progressBar1.setVisibility(View.GONE); 
     webview.setVisibility(View.VISIBLE); 
    } 
} 

` 使用进度条负荷指标在上面的代码中完成的。

不要忘记这样做web.setWebViewClient(new MyWebViewClient());其中MyWebViewClient是你的WebClient类名

这里是上面的代码

<WebView 
    android:id="@+id/web" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:visibility="gone" /> 

<ProgressBar 
    android:id="@+id/progressBar1" 
    style="?android:attr/progressBarStyleLarge" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_centerVertical="true" /> 

Answer 5

尝试这两种options.hope它会帮助你

XML

1.去除回调的处理程序

handel.postDelayed(new Runnable() { 

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

     startActivity(loadSplash); 

     finish(); 
     handel.removeCallbacks(this); 

     } 
    }, 3000); 

使用螺纹，而不是处理程序

public class Splash extends Activity { 

protected boolean _active = true; 
protected int _splashTime = 3000; 
Thread splashTread; 
private boolean stop = false; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.splashscreen); 
    splashTread = new Thread() 
    { 
     @Override 
     public void run() { 
      try { 
       int waited = 0; 
       while (_active && (waited < _splashTime)) { 
        sleep(100); 
        if (_active) { 
         waited += 100; 
        } 
       } 
      } catch (InterruptedException e) { 
       // do nothing 
      } finally { 
       if (!stop) { 
        startActivity(new Intent(Splash.this, MyActivity.class)); 
        finish(); 
       } else 
        finish(); 
      } 
     } 
    }; 
    splashTread.start(); 
} 

}