java - Android Webview 的启动屏幕

Question

我有一个 WebView 应用程序，想要添加一个启动屏幕以在加载页面时显示或在设定的时间内显示。我尝试过其他一些解决方案，但找不到有效的解决方案。如果有必要知道的话，我的启动图像是splash.png，位于drawable文件夹中。

这是我的 MainActivity.java

public class MainActivity extends Activity {

private GoogleApiClient client;

@Override
public void onBackPressed()
{
    WebView webView = (WebView) findViewById(R.id.webView);
    if(webView.canGoBack()){
        webView.goBack();
    }
    if (doubleBackToExitPressedOnce) {
        super.onBackPressed();
        return;
    }

    this.doubleBackToExitPressedOnce = true;
    Toast.makeText(this, "Tap Twice To Exit", Toast.LENGTH_SHORT).show();

    new Handler().postDelayed(new Runnable() {

        @Override
        public void run() {
            doubleBackToExitPressedOnce=false;
        }
    }, 2000);
}

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


    WebView view = (WebView) this.findViewById(R.id.webView);
    view.getSettings().setJavaScriptEnabled(true);
    view.setWebViewClient(new MyBrowser());

    client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
    if(isNetworkStatusAvialable (getApplicationContext())) {
        view.loadUrl("file:///android_asset/index.html");
    } else {
        view.loadUrl("file:///android_asset/error.html");

    }
}
public static boolean isNetworkStatusAvialable (Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivityManager != null)
    {
        NetworkInfo netInfos = connectivityManager.getActiveNetworkInfo();
        if(netInfos != null)
            if(netInfos.isConnected())
                return true;
    }
    return false;
}
@Override
public void onStart() {
    super.onStart();

    client.connect();
    Action viewAction = Action.newAction(
            Action.TYPE_VIEW,
            "MLINKS",
            Uri.parse("http://host/path"),

            Uri.parse("android-app://PACKAGE-NAME/http/host/path")
    );
    AppIndex.AppIndexApi.start(client, viewAction);
}

@Override
public void onStop() {
    super.onStop();

    Action viewAction = Action.newAction(
            Action.TYPE_VIEW,
            "MLINKS",
            Uri.parse("http://host/path"),
            Uri.parse("android-app://PACKAGE-NAME/http/host/path")
    );
    AppIndex.AppIndexApi.end(client, viewAction);
    client.disconnect();
}

private class MyBrowser extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

boolean doubleBackToExitPressedOnce = false;

}

感谢您的帮助!

Answer 1

编辑:

定义进度对话框:

    private ProgressDialog pd;

然后在你的里面:

view.setWebViewClient(new MyBrowser() {

插入:

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            pd.show();
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            pd.dismiss();
        }