每次有人启动我的应用程序时，我都会尝试刷新我的 webview 的内容。假设有人转到应用程序内的不同页面或进入后台，然后重新启动应用程序，我希望我的 webview 的内容基于刷新/重新加载我在服务器上所做的最新更改。这是我到目前为止的代码：
public class MainActivity extends Activity {
WebView webview;
ProgressBar progress;
public final static int MENU_FULLSCREEN_ON = 3;
public final static int MENU_FULLSCREEN_OFF = 4;
private boolean fullscreen = true;
public static Object SPLASH_LOCK = new Object();
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
// getWindow().requestFeature(Window.FEATURE_PROGRESS);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
progress = (ProgressBar) findViewById(R.id.ProgressBar);
progress.setVisibility(View.VISIBLE);
webview = (WebView)findViewById(R.id.webview);
if(CheckNetwork.isInternetAvailable(MainActivity.this))
{
webview.setInitialScale(1);
WebSettings webSettings = webview.getSettings();
webSettings.setJavaScriptEnabled(true);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
// webview.setWebViewClient(new MyCustomWebViewClient());
if (Build.VERSION.SDK_INT >= 11){
webview.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
webview.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
webview.setScrollbarFadingEnabled(false);
webview.getSettings().setRenderPriority(RenderPriority.HIGH);
webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
// webview.getSettings().setBlockNetworkLoads(true);
webview.getSettings().setBuiltInZoomControls(true);
webview.clearCache(true);
webview.loadUrl("http://myserver.com/firstpage");
webview.getSettings().setDomStorageEnabled(true);
webview.getSettings().setDatabaseEnabled(true);
webview.getSettings().setAppCacheEnabled(true);
//http://www.inpixelitrust.fr/demos/restaurant_picker/
//file:///android_asset/index.html
webview.reload();
webview.getSettings().setSupportZoom(false);
}else{
Toast toast = Toast.makeText(MainActivity.this, "No Internet Connection", Toast.LENGTH_LONG);
toast.show();
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
alertDialog.setTitle("Connection Problem");
alertDialog.setMessage("You need to be connected to the internet to view this app");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, final int which) {
return;
}
});
alertDialog.show();
}
/* webview.setWebChromeClient(new WebChromeClient()
{
public void onProgressChanged(WebView view, int progress)
{
// update the progressBar
MainActivity.this.setProgress(progress * 100);
}
});*/
if (!isTaskRoot()) {
final Intent intent = getIntent();
final String intentAction = intent.getAction();
if (intent.hasCategory(Intent.CATEGORY_LAUNCHER) && intentAction != null && intentAction.equals(Intent.ACTION_MAIN)) {
finish();
return;
}
}
setFullscreen();
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(event.getAction() == KeyEvent.ACTION_DOWN){
switch(keyCode)
{
case KeyEvent.KEYCODE_BACK:
if(webview.canGoBack() == true){
webview.goBack();
}else{
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);
menu.add(0, MENU_FULLSCREEN_ON, 0, R.string.menu_fullscreen_on);
menu.add(0, MENU_FULLSCREEN_OFF, 0, R.string.menu_fullscreen_off);
return true;
}
@Override
public boolean onPrepareOptionsMenu(Menu menu)
{
super.onPrepareOptionsMenu(menu);
menu.findItem(MENU_FULLSCREEN_ON).setVisible(!fullscreen);
menu.findItem(MENU_FULLSCREEN_OFF).setVisible(fullscreen);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId()) {
case MENU_FULLSCREEN_ON:
fullscreen = true;
setFullscreen();
return true;
case MENU_FULLSCREEN_OFF:
fullscreen = false;
setFullscreen();
return true;
}
return false;
}
private void setFullscreen()
{
if (fullscreen) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().clearFlags(
WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
} else {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().addFlags(
WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
}
}
/*
@Override
protected void onNewIntent(Intent intent) {
setFullscreen();
}*/
private class MyCustomWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
//view.loadUrl(url);
return true;
}
public void onPageStarted(WebView view, String url, Bitmap favicon) {
progress.setVisibility(View.VISIBLE);
}
public void onPageFinished(WebView view, String url) {
progress.setVisibility(View.GONE);
synchronized (SPLASH_LOCK) {
SPLASH_LOCK.notifyAll();
}
}
}
}