Question

我是Android应用程序的新手，这是我的第一个应用程序。我已经创建了启动画面并且可以正常工作..但是在它消失了一个长长的白色空白屏幕大约2-5秒后，网址开始加载..

我的问题是..如何在加载URL时在Splash Screen中制作一些加载或进度条？所以没有白色的空白屏幕。抱歉我的英语不好。

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

不要将启动画面设置为单独的活动。在您的WebView活动中添加启动功能，即您的网页加载活动。收听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

，您还可以获得页面加载进度

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);
                   }
                }
            });

Answer 2

尝试这两个选项中的任何一个。它会帮助你

1.删除回调处理程序

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);

使用线程代替处理程序

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();
}

}

Answer 3

以下是如何操作 -

    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");

您可以在此处找到完整示例 - Splash Screen While Loading a URL

Answer 4

您可以使用 AsyncTask ＆amp;将该加载URL代码放入AsyncTask＆amp;使用进度条查看进度。

帮助链接：

For AsyncTask

For ProgressBar

我希望这对你有所帮助。

Answer 5

在这里你去.. Jibran Khan说，不要创建单独的启动活动。在webview上使用启动功能。首先通过扩展为WebViewClient创建一个webclient类，你将得到像这样的未实现的方法。

{
    @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);
    }
}

` 使用进度条作为上面代码中的加载指示器。

请勿忘记执行此操作web.setWebViewClient(new MyWebViewClient());其中MyWebViewClient是您的webclient类名称

这里是上面代码的xml

 <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" />

Android Webview：加载网址时启动画面

5 个答案: