Question

我想知道在我的Android应用中是否有多个webview实例正在创建。如果是，我该如何解决？

我混淆的原因是我在Chrome开发者工具中看到了这一点。

每当我调用loadURL时，我在Chrome上看到一个新的订单项，好像是否有一个新的WebView实例正在创建。这是我的代码

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);        

    WebView myWebView = (WebView) findViewById(R.id.webview);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        if (0 != (getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE))
        { WebView.setWebContentsDebuggingEnabled(true); }
    }
    myWebView.setWebViewClient(new WebViewClient(){
        public void onPageFinished(WebView view, String url) {
            // Page is done loading;
            _appRunning = true;
        }
    });
    myWebView.addJavascriptInterface(new WebAppInterface(this), "Android");

    myWebView.getSettings().setMediaPlaybackRequiresUserGesture(false);
    myWebView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE);

    final WebSettings webSettings = myWebView.getSettings();

    webSettings.setJavaScriptEnabled(true);
    webSettings.setDomStorageEnabled(true);
    webSettings.setAppCachePath(f.getAbsolutePath());
    webSettings.setAllowFileAccess(true);
    webSettings.setAppCacheEnabled(true);

  }
    @Override
    public void onResume(){
        super.onResume();
        if(!checkConnectivity()) return;
        _appRunning = true;
        WebView myWebView = (WebView) findViewById(R.id.webview);
        String url = getString(R.string.app_url);

        myWebView.loadUrl(url);
        myWebView.onResume();
        hideSystemUI();
    }

    @Override
    public void onPause() {
        super.onPause();  // Always call the superclass method first
        stopPlayer();
        //myWebView.onPause();            
    }

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

    private void stopPlayer(){
        WebView myWebView = (WebView) findViewById(R.id.webview);
        myWebView.loadUrl("about:blank");
        showSystemUI();
        _appRunning = false;
    }

Answer 1

不要在stopPlayer（）和onResume（）中重新声明WebView。使用您在onCreate（）中创建的相同实例。您可以将该webView定义为字段并在onCreate（）中初始化它并在任何地方使用它。

WebView myWebView;

@Override
protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);        

myWebView = (WebView) findViewById(R.id.webview);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
    if (0 != (getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE))
    { WebView.setWebContentsDebuggingEnabled(true); }
}
myWebView.setWebViewClient(new WebViewClient(){
    public void onPageFinished(WebView view, String url) {
        // Page is done loading;
        _appRunning = true;
    }
});
myWebView.addJavascriptInterface(new WebAppInterface(this), "Android");

myWebView.getSettings().setMediaPlaybackRequiresUserGesture(false);
myWebView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE);

final WebSettings webSettings = myWebView.getSettings();

webSettings.setJavaScriptEnabled(true);
webSettings.setDomStorageEnabled(true);
webSettings.setAppCachePath(f.getAbsolutePath());
webSettings.setAllowFileAccess(true);
webSettings.setAppCacheEnabled(true);

}
@Override
public void onResume(){
    super.onResume();
    if(!checkConnectivity()) return;
    _appRunning = true;
    String url = getString(R.string.app_url);

    myWebView.loadUrl(url);
    myWebView.onResume();
    hideSystemUI();
}

@Override
public void onPause() {
    super.onPause();  // Always call the superclass method first
    stopPlayer();
    //myWebView.onPause();            
}

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

private void stopPlayer(){

    myWebView.loadUrl("about:blank");
    showSystemUI();
    _appRunning = false;
}

Android Webview - 是否创建了多个实例？

1 个答案: