我正在android studio中开发Webview应用,但遇到了一些问题。我的应用程序运行良好,没有任何错误即可编译并运行。但是当我按下返回按钮时,它崩溃了。请帮我,因为我必须将它汇总到我的大学中
这是我正在使用的我的代码:
public class MainActivity extends AppCompatActivity{
private ProgressBar progressBar;
private Toolbar toolbar;
private WebView webView;
@SuppressLint("SetJavaScriptEnabled")
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
progressBar.setVisibility(View.GONE);
WebView webView = (WebView) findViewById(R.id.webView);
webView.setWebViewClient(new WebViewClientDemo());
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
webView.getSettings().setAppCacheEnabled(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.getSettings().setDomStorageEnabled(true);
webView.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setSavePassword(true);
webView.getSettings().setSaveFormData(true);
webView.getSettings().setLoadsImagesAutomatically(true);
webView.loadUrl("https://google.in/");
}
private class WebViewClientDemo extends WebViewClient {
@Override public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressBar.setVisibility(View.GONE);
progressBar.setProgress(100);
}
@Override public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
progressBar.setVisibility(View.VISIBLE);
progressBar.setProgress(0);
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (webView.canGoBack()) {
webView.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
}
答案 0 :(得分:2)
只需更改此行:
salesorderdetail
对此:
WebView webView = (WebView) findViewById(R.id.webView);
就这样,尽情享受:)