我在减少在WebView中显示进度条的时间方面存在问题。对于添加图像的不感兴趣。 enter image description here。
我在哪里可以实现某些线程的东西停止显示进度条一秒钟，而我的Web在WebView中运行？
我在onPageStarted中显示进度条之前尝试了实现线程，但它等待整个加载页面，不仅用于加载进度条。
我们在网页上的加载非常慢，因此我们需要在没有进度条的情况下向用户显示webview中的一到两秒加载页面，此时显示“加载”进度条。
如果您有疑问，请问我，我们需要快速回复以解决此问题。我试图找到一些解决方案，但没有。
非常感谢！
有我的ChromeClien.class
public class MyWebChromeClient extends WebChromeClient {
private ProgressListener mListener;
public MyWebChromeClient(ProgressListener listener) {
mListener = listener;
}
@Override
public void onProgressChanged(WebView view, int newProgress) {
mListener.onUpdateProgress(newProgress);
super.onProgressChanged(view, newProgress);
}
public interface ProgressListener {
public void onUpdateProgress(int progressValue);
}}
有MainActivity.class
public class MainActivity extends AppCompatActivity{
private WebView webview;
ProgressDialog prDialog;
String cekani;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
CookieManager.getInstance().setAcceptCookie(true);
Boolean isFirstRun = getSharedPreferences("PREFERENCE", MODE_PRIVATE)
.getBoolean("isFirstRun", true);
if (isFirstRun) {
//show start activity
startActivity(new Intent(MainActivity.this, PrvniSpusteni.class));
}
getSharedPreferences("PREFERENCE", MODE_PRIVATE).edit()
.putBoolean("isFirstRun", false).commit();
if(KontrolaInternetu.isInternetAvailable(MainActivity.this)) //Vrátí hodnotu TRUE, pokud je připojení k internetu k dispozici
{
webview =(WebView)findViewById(R.id.webView);
//Nastavení webové stránky
webview.loadUrl(getString(R.string.url_aplikace));
webview.setWebViewClient(new MyWebViewClient());
//Puštění JavaScriptu pro web
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
webview.getSettings().setDomStorageEnabled(true);
webview.getSettings().setUseWideViewPort(true);
webview.setOverScrollMode(WebView.OVER_SCROLL_NEVER);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
WebSettings ws = webview.getSettings();
ws.setJavaScriptEnabled(true);
ws.setAllowFileAccess(true);
if (android.os.Build.VERSION.SDK_INT >= 21) {
CookieManager.getInstance().setAcceptThirdPartyCookies(webview, true);
}else {
CookieManager.getInstance().setAcceptCookie(true);
}
webview.setWebChromeClient(new WebChromeClient(){
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public void onPermissionRequest(final PermissionRequest request) {
request.grant(request.getResources());
}
});
if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.ECLAIR) {
try {
Log.d(TAG, "Enabling HTML5-Features");
Method m1 = WebSettings.class.getMethod("setDomStorageEnabled", new Class[]{Boolean.TYPE});
m1.invoke(ws, Boolean.TRUE);
Method m2 = WebSettings.class.getMethod("setDatabaseEnabled", new Class[]{Boolean.TYPE});
m2.invoke(ws, Boolean.TRUE);
Method m3 = WebSettings.class.getMethod("setDatabasePath", new Class[]{String.class});
m3.invoke(ws, "/data/data/" + getPackageName() + "/databases/");
Method m4 = WebSettings.class.getMethod("setAppCacheMaxSize", new Class[]{Long.TYPE});
m4.invoke(ws, 1024*1024*8);
Method m5 = WebSettings.class.getMethod("setAppCachePath", new Class[]{String.class});
m5.invoke(ws, "/data/data/" + getPackageName() + "/cache/");
Method m6 = WebSettings.class.getMethod("setAppCacheEnabled", new Class[]{Boolean.TYPE});
m6.invoke(ws, Boolean.TRUE);
Log.d(TAG, "Enabled HTML5-Features");
}
catch (NoSuchMethodException e) {
Log.e(TAG, "Reflection fail", e);
}
catch (InvocationTargetException e) {
Log.e(TAG, "Reflection fail", e);
}
catch (IllegalAccessException e) {
Log.e(TAG, "Reflection fail", e);
}
}
}
else
{
//Zobrazení AlertDialogu pokud není připojení k internetu
runOnUiThread(new Runnable() {
@Override
public void run() {
if (!isFinishing()){
new AlertDialog.Builder(MainActivity.this)
.setTitle(getString(R.string.no_internet))
.setMessage(getString(R.string.internet))
.setCancelable(false)
.setIcon(R.drawable.icon)
.setPositiveButton(getString(R.string.ok), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
System.exit(0);
}})
.setNegativeButton(getString(R.string.zrusit), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}})
.show();
}
}
});
}
}
//Při stisknutí tlačítka zpět se uživatel vrátí ve webview nazpět bez toho, aby aplikace spadla.
private final String TAG = MainActivity.class.getSimpleName();
// Progress bar - zobrazí se tehdy, pokud čekám na načítání stránky
private class MyWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
prDialog = new ProgressDialog(MainActivity.this);
prDialog.setIcon(R.drawable.icon);
prDialog.setMessage(getString(R.string.nacitani_webove_stranky));
prDialog.show();
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if(prDialog!=null){
prDialog.dismiss();
}
}
}
//Při stisknutí tlačítka zpět se uživatel dostane zpět pouze ve webview
@Override
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);
}
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.endsWith(".mp3")) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(url), "audio/*");
view.getContext().startActivity(intent);
return true;
} else if (url.endsWith(".mp4") || url.endsWith(".3gp")) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(url), "video/*");
view.getContext().startActivity(intent);
return true;
} else {
return true;
}}}
嘿兄弟，你不一定需要为你的要求实现线程。首先，您可以在webview中加载网址，在特定时间段后，您可以开始显示进度条。要在特定时间段后调用进度条，您可以使用Handler。
私有类MyWebViewClient扩展WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
//Do something after 100ms
prDialog = new ProgressDialog(MainActivity.this);
prDialog.setIcon(R.drawable.icon);
prDialog.setMessage(getString(R.string.nacitani_webove_stranky));
prDialog.show();
}
}, 100);
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if(prDialog!=null){
prDialog.dismiss();
}
}