笔记115--app中引入网页（解决网页上Alert不响应的问题）

1、返回键可以返回网页的前一页，而且可以结束当前Activity

public boolean onKeyDown(int keyCode, KeyEvent event){
if ((keyCode == KeyEvent.KEYCODE_BACK) &&
mWebView.canGoBack()){
//返回前一个页面
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
2、解决网页上Alert不响应。原理是捕获网页上Alert，然后自己弹出Android中的Dialog。

try {
//判断输入的内容是不是网址
if (URLUtil.isNetworkUrl(url)){
//装载网址
mWebView.loadUrl(url);
}
}catch (Exception e) {
Log.e("TAG", e.toString());
}

new Thread(){

@Override
public void run() {
// TODO Auto-generated method stub
super.run();
//设置支持JavaScript脚本
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
//设置可以访问文件
webSettings.setAllowFileAccess(true);
//设置支持缩放
webSettings.setBuiltInZoomControls(true);
Log.e("TAG", "------------2---------------->>>");
//设置WebViewClient
mWebView.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Log.e("TAG", "------------112--------------->>>" + url);
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, String url)
{
super.onPageFinished(view, url);
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
super.onPageStarted(view, url, favicon);
}
});
//设置WebChromeClient
Log.e("TAG", "------------3---------------->>>");
mWebView.setWebChromeClient(new WebChromeClient(){
@Override
//处理javascript中的alert
public boolean onJsAlert(WebView view, String url, String message,
final JsResult result)
{
//构建一个Builder来显示网页中的对话框
Builder builder = new Builder(WiwebserverActivity.this);
builder.setTitle("提示对话框");
builder.setMessage(message);
builder.setPositiveButton(android.R.string.ok,
new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//点击确定按钮之后,继续执行网页中的操作
result.confirm();
}
});
builder.setCancelable(false);
builder.create();
builder.show();
return true;
};
@Override
//处理javascript中的confirm
public boolean onJsConfirm(WebView view, String url, String message,
final JsResult result)
{
Builder builder = new Builder(WiwebserverActivity.this);
builder.setTitle("带选择的对话框");
builder.setMessage(message);
builder.setPositiveButton(android.R.string.ok,
new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
result.confirm();
}
});
builder.setNegativeButton(android.R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
result.cancel();
}
});
builder.setCancelable(false);
builder.create();
builder.show();
return true;
};
@Override
//处理javascript中的prompt
//message为网页中对话框的提示内容
//defaultValue在没有输入时，默认显示的内容
public boolean onJsPrompt(WebView view, String url, String message,
String defaultValue, final JsPromptResult result) {
//自定义一个带输入的对话框由TextView和EditText构成
final LayoutInflater factory = LayoutInflater.from(WiwebserverActivity.this);
final View dialogview = factory.inflate(R.layout.prom_dialog, null);
//设置TextView对应网页中的提示信息
((TextView) dialogview.findViewById(R.id.TextView_PROM)).setText(message);
//设置EditText对应网页中的输入框
((EditText) dialogview.findViewById(R.id.EditText_PROM)).setText(defaultValue);

Builder builder = new Builder(WiwebserverActivity.this);
builder.setTitle("带输入的对话框");
builder.setView(dialogview);
builder.setPositiveButton(android.R.string.ok,
new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//点击确定之后，取得输入的值，传给网页处理
String value = ((EditText) dialogview.findViewById(R.id.EditText_PROM)).getText().toString();
result.confirm(value);
}
});
builder.setNegativeButton(android.R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
result.cancel();
}
});
builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
public void onCancel(DialogInterface dialog) {
result.cancel();
}
});
builder.show();
return true;
};
@Override
//设置网页加载的进度条
public void onProgressChanged(WebView view, int newProgress)
{
WiwebserverActivity.this.getWindow().setFeatureInt(Window.FEATURE_PROGRESS, newProgress * 100);
super.onProgressChanged(view, newProgress);
}

@Override
//设置应用程序的标题title
public void onReceivedTitle(WebView view, String title)
{
WiwebserverActivity.this.setTitle(title);
super.onReceivedTitle(view, title);
}
});
}

}.start();