Android 如何使用webview显示进度条
这是我最后的代码和密码。我想显示用户网络信息。当用户脱机时，向用户发出警报。Android 如何使用webview显示进度条,android,android-activity,webview,loading,progress,Android,Android Activity,Webview,Loading,Progress,这是我最后的代码和密码。我想显示用户网络信息。当用户脱机时，向用户发出警报。 我想在离线或在线状态下向用户显示。我使用进度条。当我使用此代码时，我的应用程序正在崩溃并退出应用程序。我该怎么办 ConnectivityManager conMgr; NetworkInfo netInfo; private WebView webView; ProgressDialog progressDialog; @Override protected void on
我想在离线或在线状态下向用户显示。我使用进度条。当我使用此代码时，我的应用程序正在崩溃并退出应用程序。我该怎么办
ConnectivityManager conMgr;
NetworkInfo netInfo;
private WebView webView;
ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_activity1);
Toast.makeText(Activity5.this, "welcome",30000).show();
progressDialog = new ProgressDialog(Activity5.this);
Button btn1 = (Button) findViewById(R.id.buttn1);
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
System.exit(0);
}
});
Button b = (Button) findViewById(R.id.button10);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(Activity5.this, Activity2.class));
}
});
String url = "http://student.iaun.ac.ir";
webView = (WebView) findViewById(R.id.webView2);
webView.setWebViewClient(new myWebViewClient());
webView.getSettings().setJavaScriptEnabled(false);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setBuiltInZoomControls(true);
webView.loadUrl(url);
webView.getSettings().setSavePassword(false);
Button button = (Button) findViewById(R.id.new_button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(Activity5.this, Prefs.class));
}
});
progressDialog.setMessage("please wait web page is loading");
progressDialog.setCancelable(false);
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.show();
new Handler().postDelayed(new Runnable() {
public void run() {
progressDialog.dismiss();
}
}, 25000);
progressDialog = new ProgressDialog(Activity5.this);
if (isOnline()) {
/*Your Code*/
}
else{
try {
AlertDialog alertDialog = new AlertDialog.Builder(
Activity5.this).create();
alertDialog.setTitle("Info");
alertDialog.setMessage("Please check your internet connection");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
} catch (Exception e) {
}
}
new Thread(new Runnable() {
@Override
public void run() {
try {
startDelay();
webView.getSettings().setJavaScriptEnabled(true);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
void startDelay() throws InterruptedException {
Thread.sleep(15000);
}
private boolean isOnline() {
conMgr = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()) {
return false;
}
return true;
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity1, menu);
return true;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Check if the key event was the Back button and if there's history
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
// If it wasn't the Back key or there's no web page history, bubble up to the default
// system behavior (probably exit the activity)
return super.onKeyDown(keyCode, event);
}
您必须使用WebViewClient，并重写方法onPageStarted（）、onpageFinished（）等
public class WebActivity extends Activity {
private WebView browser;
ProgressDialog progressDialog;
ConnectivityManager conMgr;
NetworkInfo netInfo;
String url;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_activity);
browser = (WebView) findViewById(R.id.shop);
progressDialog = new ProgressDialog(WebActivity.this);
if (isOnline()) {
browser.getSettings().setDomStorageEnabled(true);
browser.getSettings().setJavaScriptEnabled(true);
browser.loadUrl(/*Your url paste here*/);
browser.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return false;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressDialog.dismiss();
}
@Override
public void onPageStarted(WebView view, String url,
Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
progressDialog.setMessage("Loading ...");
progressDialog.setCancelable(false);
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.show();
}
});
} else {
try {
AlertDialog alertDialog = new AlertDialog.Builder(
WebActivity.this).create();
alertDialog.setTitle("Info");
alertDialog.setMessage("Please check your internet connection");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
} catch (Exception e) {
}
}
}
private boolean isOnline() {
conMgr = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()) {
return false;
}
return true;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && browser.canGoBack()) {
browser.goBack();
return true;
} else {
moveTaskToBack(true);
return super.onKeyDown(keyCode, event);
}
}
}
ConnectivityManager conMgr;
NetworkInfo netInfo;
ProgressDialog progressDialog;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_activity);
browser = (WebView) findViewById(R.id.shop);
progressDialog = new ProgressDialog(WebActivity.this);
if (isOnline()) {
/*Your Code*/
}
else{
try {
AlertDialog alertDialog = new AlertDialog.Builder(
WebActivity.this).create();
alertDialog.setTitle("Info");
alertDialog.setMessage("Please check your internet connection");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
} catch (Exception e) {
}
}
private boolean isOnline() {
conMgr = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()) {
return false;
}
return true;
}
ConnectivityManager conMgr;
NetworkInfo netInfo;
ProgressDialog progressDialog;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_activity);
browser = (WebView) findViewById(R.id.shop);
progressDialog = new ProgressDialog(WebActivity.this);
if (isOnline()) {
/*Your Code*/
}
else{
try {
AlertDialog alertDialog = new AlertDialog.Builder(
WebActivity.this).create();
alertDialog.setTitle("Info");
alertDialog.setMessage("Please check your internet connection");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
} catch (Exception e) {
}
}
private boolean isOnline() {
conMgr = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()) {
return false;
}
return true;
}
您必须使用WebViewClient，并重写方法onPageStarted（）、onpageFinished（）等
public class WebActivity extends Activity {
private WebView browser;
ProgressDialog progressDialog;
ConnectivityManager conMgr;
NetworkInfo netInfo;
String url;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_activity);
browser = (WebView) findViewById(R.id.shop);
progressDialog = new ProgressDialog(WebActivity.this);
if (isOnline()) {
browser.getSettings().setDomStorageEnabled(true);
browser.getSettings().setJavaScriptEnabled(true);
browser.loadUrl(/*Your url paste here*/);
browser.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return false;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
progressDialog.dismiss();
}
@Override
public void onPageStarted(WebView view, String url,
Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
progressDialog.setMessage("Loading ...");
progressDialog.setCancelable(false);
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.show();
}
});
} else {
try {
AlertDialog alertDialog = new AlertDialog.Builder(
WebActivity.this).create();
alertDialog.setTitle("Info");
alertDialog.setMessage("Please check your internet connection");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
} catch (Exception e) {
}
}
}
private boolean isOnline() {
conMgr = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()) {
return false;
}
return true;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && browser.canGoBack()) {
browser.goBack();
return true;
} else {
moveTaskToBack(true);
return super.onKeyDown(keyCode, event);
}
}
}
ConnectivityManager conMgr;
NetworkInfo netInfo;
ProgressDialog progressDialog;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_activity);
browser = (WebView) findViewById(R.id.shop);
progressDialog = new ProgressDialog(WebActivity.this);
if (isOnline()) {
/*Your Code*/
}
else{
try {
AlertDialog alertDialog = new AlertDialog.Builder(
WebActivity.this).create();
alertDialog.setTitle("Info");
alertDialog.setMessage("Please check your internet connection");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
} catch (Exception e) {
}
}
private boolean isOnline() {
conMgr = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()) {
return false;
}
return true;
}
ConnectivityManager conMgr;
NetworkInfo netInfo;
ProgressDialog progressDialog;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_activity);
browser = (WebView) findViewById(R.id.shop);
progressDialog = new ProgressDialog(WebActivity.this);
if (isOnline()) {
/*Your Code*/
}
else{
try {
AlertDialog alertDialog = new AlertDialog.Builder(
WebActivity.this).create();
alertDialog.setTitle("Info");
alertDialog.setMessage("Please check your internet connection");
alertDialog.setButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
finish();
}
});
alertDialog.show();
} catch (Exception e) {
}
}
private boolean isOnline() {
conMgr = (ConnectivityManager) getApplicationContext()
.getSystemService(Context.CONNECTIVITY_SERVICE);
netInfo = conMgr.getActiveNetworkInfo();
if (netInfo == null || !netInfo.isConnected() || !netInfo.isAvailable()) {
return false;
}
return true;
}
我已经改变了代码，现在一个进度对话框出现了20秒，同时webview也加载了它的内容
public class Activity1 extends Activity {
private webview webview;
ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(getApplicationContext(), "welcome", Toast.LENGTH_LONG)
.show();
progressDialog = new ProgressDialog(Activity1.this);
String url = "http://student.iaun.ac.ir";
webview = (webview) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(false);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
webview.getSettings().setBuiltInZoomControls(true);
webview.loadUrl(url);
progressDialog.setMessage("Loading ...");
progressDialog.setCancelable(false);
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.show();
new Handler().postDelayed(new Runnable() {
public void run() {
progressDialog.dismiss();
}
}, 20000);
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Check if the key event was the Back button and if there's history
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
// If it wasn't the Back key or there's no web page history, bubble up
// to the default
// system behavior (probably exit the activity)
return super.onKeyDown(keyCode, event);
}
}
我已经改变了代码，现在一个进度对话框出现了20秒，同时webview也加载了它的内容
public class Activity1 extends Activity {
private webview webview;
ProgressDialog progressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(getApplicationContext(), "welcome", Toast.LENGTH_LONG)
.show();
progressDialog = new ProgressDialog(Activity1.this);
String url = "http://student.iaun.ac.ir";
webview = (webview) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(false);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
webview.getSettings().setBuiltInZoomControls(true);
webview.loadUrl(url);
progressDialog.setMessage("Loading ...");
progressDialog.setCancelable(false);
progressDialog.setCanceledOnTouchOutside(false);
progressDialog.show();
new Handler().postDelayed(new Runnable() {
public void run() {
progressDialog.dismiss();
}
}, 20000);
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
// Check if the key event was the Back button and if there's history
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
// If it wasn't the Back key or there's no web page history, bubble up
// to the default
// system behavior (probably exit the activity)
return super.onKeyDown(keyCode, event);
}
}
安卓：我使用这个代码，但它不起作用，程序也不正常crash@user3051593：我使用此代码，但它不起作用，并且程序很崩溃。您只需要一个警告对话框，直到您的网页完成加载，所以您只需使用WebViewClient，它就能解决您的问题。您能告诉我错误的具体原因吗（从您的日志中）.eclipse dos没有错误。当我运行程序时，它崩溃了，不幸地说，web已停止并退出程序。你能键入写代码吗？我的web视图cod是你能在记事本中看到我的代码的txt吗？你只需删除倒计时，你的web视图实例在哪里，你提供的链接无效…安卓：我使用这段代码，但它不起作用，程序是无效的crash@user3051593：我使用此代码，但它不起作用，并且程序很崩溃。您只需要一个警告对话框，直到您的网页完成加载，所以您只需使用WebViewClient，它就可以解决您的问题。您能告诉我错误的确切原因吗（来自您的日志）.eclipse dos没有错误。当我运行程序时，它崩溃了，不幸地说，web已停止并退出程序。你能键入写代码吗？我的web视图cod是你能在记事本中看到我代码的txt吗？你只需删除倒计时，你的web视图实例在哪里，你提供的链接无效…我写了这段代码，但我想使用它我的程序中的thread.sleep我应该做什么处理程序也是android中的一个线程，postDelayed（）方法的第二个参数是它的睡眠时间，从这段代码中可以看到行progressDialog.discouse（）；20秒后执行…否我想在程序中使用thread.sleep设置JavaScriptEnabled（true），因为我设置JavaScriptEnabled（false）首先和15秒后setJavaScriptEnabled（true）。我应该做什么？您只需添加语句以在run（）方法中启用java脚本，如果您需要一个单独的线程，那么您可以创建它并为该线程使用睡眠。我想添加代码，向用户显示internet状况。您使用alertDialog.setMessage(“请检查您的internet连接”）；在您的第一个cod中。我希望当用户脱机时，它会显示警报或进度bari编写此代码，但我希望在我的程序中使用thread.sleep我应该做什么处理程序也是android中的一个线程和postDelayed（）的第二个参数方法是它的睡眠时间，从这段代码中，行progressDialog.disease（）；20秒后执行…否我想在程序中使用thread.sleep设置JavaScriptEnabled（true），因为我首先设置JavaScriptEnabled（false），然后在15秒后设置JavaScriptEnabled（true）。我该怎么办？您只需为enable the java script in run（）方法添加语句，如果您需要一个单独的线程，那么您可以创建它并为该线程使用睡眠。我想添加代码，向用户显示internet状况。您使用alertDialog.setMessage（“请检查您的internet连接”）；在您的第一个cod中。我希望当用户脱机时，它显示警报或进度条