我的给定 URL 没有加载此代码，但是如果我按“主页”键并再次单击应用程序图标（即恢复我的活动），那么它会加载。我尝试查看活动生命周期，修改了代码，但仍然无法正常工作。如果我需要进一步澄清我的问题，请告诉我。谢谢。
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.IntentFilter;
import android.content.DialogInterface.OnCancelListener;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.http.SslError;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Window;
import android.webkit.SslErrorHandler;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView.SavedState;
import android.widget.Toast;
import com.ABC.R;
import com.ABC.util.CustomProgressDialogs;
import com.ABC.util.DeviceCheck;
import com.ABC.util.GlobalFunction;
import com.ABC.util.HTML5WebView;
import com.ABC.util.KeyBoard;
import com.ABC.util.NetworkCheck;
public class CanvasActivity extends Activity {
private HTML5WebView mWebView;
private ProgressDialog webPageDialog;
private Context context;
private GlobalFunction globalFunc;
private KeyBoard keyBoard;
private BroadcastReceiver connectionReceiver;
String myUrl;
SharedPreferences prefs;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
Log.d("killapp", "killapp");
globalFunc.killApplication(context);
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
dialog.cancel();
}
});
AlertDialog exitDialog = builder.create();
exitDialog.show();
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = CanvasActivity.this;
mWebView = new HTML5WebView(context);
// setContentView(mWebView.getLayout());
final DeviceCheck deviceCheck = new DeviceCheck(context); // change
// mWebView = new HTML5WebView(this);
// getWindow().requestFeature(Window.);
// setContentView()
// getWindow().
setContentView(mWebView.getLayout());
globalFunc = new GlobalFunction();
webPageDialog = new ProgressDialog(context);
mWebView.setWebViewClient(new WebViewClient() {
@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
super.onReceivedError(view, errorCode, description, failingUrl);
Log.d("onReceivedError", failingUrl + " " + errorCode);
mWebView.loadUrl("file:///android_asset/myerrorpage.html");
}
@Override
public void onReceivedSslError(WebView view,
SslErrorHandler handler, SslError error) {
super.onReceivedSslError(view, handler, error);
Log.d("onReceivedSslError", "ssl error");
handler.proceed();
// To supercede SSL certificate error.
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
Log.d("page started", "page loading started");
webPageDialog.show();
webPageDialog.setContentView(CustomProgressDialogs
.iphoneProgressDialog(context));
webPageDialog.setCancelable(true);
// change
webPageDialog.setOnCancelListener(new OnCancelListener() {
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
webPageDialog.dismiss();
globalFunc.killApplication(context);
}
});
}
@Override
public void onPageFinished(final WebView view, final String url) {
Log.i("onPageFinished", "onPageFinished");
if (webPageDialog.isShowing()) {
webPageDialog.dismiss();
}
}
});
if (getIntent().getStringExtra("Message") != null) {
Toast.makeText(getApplicationContext(),
getIntent().getIntExtra("push details", 0) + "",
Toast.LENGTH_LONG).show();
}
keyBoard = new KeyBoard(mWebView, context);
mWebView.addJavascriptInterface(keyBoard, "KeyBoard");
prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
/*
* if(prefs.getString("url",
* getResources().getString(R.string.MYURL_URL)).trim().equals("")){
* myUrl=getResources().getString(R.string.MYURL_URL).trim(); }else{
* myUrl = prefs.getString("url",
* getResources().getString(R.string.MYURL_URL)).trim(); }
* mWebView.loadUrl(myUrl);
*/
myUrl = getResources().getString(R.string.MYURL_URL).trim();
/*
* if (!myUrl.equalsIgnoreCase(prefs.getString("url",
* getResources().getString(R.string.MYURL_URL)).trim())) {
*
* myUrl = prefs.getString("url",
* getResources().getString(R.string.MYURL_URL)).trim();
*
* }
*/
// mWebView.loadUrl(myUrl);
if (new NetworkCheck(context).isOnline()) {
// change
webPageDialog.show();
webPageDialog.setContentView(CustomProgressDialogs
.iphoneProgressDialog(context));
webPageDialog.setCancelable(true);
webPageDialog.setOnCancelListener(new OnCancelListener() {
public void onCancel(DialogInterface dialog) {
// TODO Auto-generated method stub
webPageDialog.dismiss();
globalFunc.killApplication(context);
}
});
if (savedInstanceState != null) {
mWebView.restoreState(savedInstanceState);
} else {
mWebView.loadUrl(myUrl);
/*
* if (deviceCheck.isTablet()) {
* setRequestedOrientation(ActivityInfo
* .SCREEN_ORIENTATION_LANDSCAPE); mWebView.loadUrl(myUrl); }
* else {
* setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
* ); mWebView.loadUrl(myUrl); }
*/
}
}
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
mWebView.loadUrl(myUrl);
}
@Override
public void onResume() {
super.onResume();
if (!((prefs.getString("url",
getResources().getString(R.string.MYURL_URL)).trim()))
.equals("")) {
myUrl = prefs.getString("url",
getResources().getString(R.string.MYURL_URL)).trim();
}
if (!(myUrl.equals(mWebView.getUrl()))) {
// mWebView.loadUrl(myUrl);
}
/*
* if (!mWebView.getUrl().equalsIgnoreCase(prefs.getString("url",
* getResources().getString(R.string.MYURL_URL)).trim())) {
*
* myUrl = prefs.getString("url",
* getResources().getString(R.string.MYURL_URL)).trim();
* mWebView.loadUrl(myUrl); }
*/
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
Log.d("CanvasActivity-onOptionsItemSelected", "in option selected");
switch (item.getItemId()) {
case R.id.url:
startActivity(new Intent(this, EditURL.class));
return true;
}
return false;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
Log.d("CanvasActivity-onCreateOptionsMenu",
"in oncreate option menu");
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menuxml, menu);
return true;
}
@Override
public void onStop() {
super.onStop();
mWebView.stopLoading();
}
// onkeydown was here.
public void startBroadcastService() {
connectionReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
ConnectivityManager connManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo mWifi = connManager
.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
ConnectivityManager connManager1 = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo mMobile = connManager1
.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
boolean isNoNetwork = intent.getBooleanExtra(
ConnectivityManager.EXTRA_NO_CONNECTIVITY, false);
if (!isNoNetwork) {
if (mWifi.isAvailable()) {
}
if ((mWifi.isConnected() && mWifi.isAvailable())
|| (mMobile.isConnected() && mMobile.isAvailable())) {
if (mWebView.getUrl().contains("myerrorpage")) {
mWebView.loadUrl(myUrl);
}
}
}
}
};
registerReceiver(connectionReceiver, new IntentFilter(
"android.net.conn.CONNECTIVITY_CHANGE"));
}
}