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我正在使用以下代碼在我的Android應用中顯示webview。在webview中啓用後退按鈕
package com.company.myapp;
import com.google.android.apps.analytics.GoogleAnalyticsTracker;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class ArticlesActivity extends Activity {
/** Initialize the Google Analytics Tracker */
GoogleAnalyticsTracker tracker;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_PROGRESS);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
WebView webview = new WebView(this);
setContentView(webview);
setProgressBarVisibility(true);
webview.getSettings().setJavaScriptEnabled(true);
webview.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
final Activity activity = this;
tracker = GoogleAnalyticsTracker.getInstance();
// Start the tracker, updating google every 20 seconds
tracker.start((String) getText(R.string.analyticsID), 20, this);
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
activity.setProgress(progress * 100);
}
});
webview.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
}
});
webview.loadUrl("http://www.google.com");
}
@Override
public void onResume() {
tracker.trackPageView("ArticlesActivity");
super.onResume();
}
@Override
protected void onDestroy() {
super.onDestroy();
// Stop the tracker when it is no longer needed.
tracker.stop();
}
}
我需要啓用後退按鈕如果歷史存在的,而不是剛出的WebView退一步。
I've tried many different code examples such as this但無法取得任何工作。當後退按鈕被按下時,應用程序纔會關閉。
這裏是我的代碼以後退按鈕的代碼,但它只是崩潰時則後退按鈕被按下的應用程序:
package com.company.myapp;
import com.google.android.apps.analytics.GoogleAnalyticsTracker;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class ArticlesActivity extends Activity {
WebView webview;
/** Initialize the Google Analytics Tracker */
GoogleAnalyticsTracker tracker;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_PROGRESS);
getWindow().setFeatureInt(Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
WebView webview = new WebView(this);
setContentView(webview);
setProgressBarVisibility(true);
webview.getSettings().setJavaScriptEnabled(true);
webview.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
final Activity activity = this;
tracker = GoogleAnalyticsTracker.getInstance();
// Start the tracker, updating google every 20 seconds
tracker.start((String) getText(R.string.analyticsID), 20, this);
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
activity.setProgress(progress * 100);
}
});
webview.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
}
});
webview.loadUrl("http://www.google.com");
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onResume() {
tracker.trackPageView("ArticlesActivity");
super.onResume();
}
@Override
protected void onDestroy() {
super.onDestroy();
// Stop the tracker when it is no longer needed.
tracker.stop();
}
}
有人能幫助我的解決方案?
取代它雖然你提到你試圖在鏈接中提到的例子,你也覆蓋onBackPressed方法? –
感謝您的評論Rahul。我編輯了我的問題,並添加了我正在使用的示例中的代碼。實際的onKeyDown方法可以工作,因爲我可以在按下後退按鈕時顯示吐司,但是當我按下後退按鈕時使用應用程序崩潰之上的代碼時。我嘗試了onBackPressed,但同樣的事情發生。 – Brigante
你說應用程序崩潰,你也可以發佈你的崩潰轉儲,日誌貓.. –