我有一個應用程序,我有一個WebView,我顯示一些網站。它的工作原理是,點擊網頁中的鏈接進入我的應用程序內部網站的下一頁。但是當我點擊手機的後退按鈕時,它會直接進入我的應用程序。我想回到網站上的前一頁。我怎樣才能做到這一點?爲什麼後退按鈕無法使用此代碼?
這是我的代碼。
public class WebView extends AppCompatActivity {
private android.webkit.WebView webView;
private ProgressBar progressBar;
private LinearLayout layoutProgress;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.webview);
webView = (android.webkit.WebView) findViewById(R.id.webViewMain);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
layoutProgress = (LinearLayout) findViewById(R.id.layoutProgress);
webView.setVisibility(View.GONE);
WebSettings settings = webView.getSettings();
settings.setJavaScriptEnabled(true);
settings.setBuiltInZoomControls(true);
settings.setSupportZoom(true);
settings.setDisplayZoomControls(false);
webView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(android.webkit.WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(android.webkit.WebView view, String url) {
webView.setVisibility(View.VISIBLE);
layoutProgress.setVisibility(View.GONE);
progressBar.setIndeterminate(false);
super.onPageFinished(view, url);
}
@Override
public void onPageStarted(android.webkit.WebView view, String url, Bitmap favicon) {
layoutProgress.setVisibility(View.VISIBLE);
progressBar.setIndeterminate(true);
super.onPageStarted(view, url, favicon);
}
});
if (isOnline()) {
webView.loadUrl("http://www.**********.com/ ");
} else {
String summary = "<html><body><font color='red'>No Internet Connection</font></body></html>";
webView.loadData(summary, "text/html", null);
toast("No Internet Connection.");
}
}
private void toast(String message) {
Toast.makeText(WebView.this, message, Toast.LENGTH_LONG).show();
}
private boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return (netInfo != null && netInfo.isConnected());
}
@Override
public void onBackPressed() {
if(webView.canGoBack() == true) {
webView.goBack();
} else {
WebView.super.onBackPressed();
}
}
}
關注這個問題: http://stackoverflow.com/questions/6077141 /如何返回到上一頁如果後退按鈕被按下在webview –
我建議你不要發表相同的問題,謝謝。 –
問題相同,但有些代碼不同 –