我在google和stackoverflow上搜索过但无法找到与Android API 17及更高版本相关的任何解决方案。
我喜欢在Button Click上从webview中检索数据。
我喜欢实现与ios类似的东西：
myText.stringByEvaluatingJavaScriptFromString
("document.getElementById('chapter-description').value")
我的源代码是：
package com.xyz.webviewtest;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.webkit.JavascriptInterface;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
public class MainActivity4 extends AppCompatActivity {
TextView textView;
@SuppressLint("JavascriptInterface")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final WebView webview = (WebView) findViewById(R.id.webView);
webview.getSettings().setJavaScriptEnabled(true);
webview.addJavascriptInterface(new MyJavaScriptInterface(this), "HtmlViewer");
webview.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
webview.loadUrl("javascript:window.HtmlViewer.showHTML" +
"('<html>'+document.getElementsByTagName('html')[0].innerHTML+'</html>');");
}
});
// new MyJavaScriptInterface(this).showHTML("HtmlViewer");
webview.loadUrl("http://www.xsoftech.com");
}
class MyJavaScriptInterface {
private Context ctx;
MyJavaScriptInterface(Context ctx) {
this.ctx = ctx;
}
public void showHTML(String html) {
new AlertDialog.Builder(ctx).setTitle("HTML").setMessage(html)
.setPositiveButton(android.R.string.ok, null).setCancelable(false).create().show();
}
}
}
http://developer.android.com/表示不推荐使用构造函数
这个构造函数在API级别17中已弃用。私有浏览是 不再直接通过WebView支持，将被删除 未来发布。喜欢使用WebSettings，WebViewDatabase， CookieManager和WebStorage可以对隐私数据进行细粒度控制。
Webview有textarea所以我可以在写完之后写一些东西，我希望能够获得点击按钮的数据。实际上，我能够获得关于webview的加载时间的数据，但是在webview中写入textarea之后无法获得按钮点击的数据。
我找到了一个可能的解决方案，但我无法获得有关按钮点击的任何数据。
解决方案是：
package example.xsoftech.sample;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.Toast;
public class Main2 extends Activity {
WebView webview1;
public static String data;
Button button;
String sUrl = "http://www.facebook.com/";
// String sUrl = "http://www.xsoftech.com";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (Button)findViewById(R.id.button);
webview1 = (WebView)findViewById(R.id.myWebview);
webview1.getSettings().setJavaScriptEnabled(true);
webview1.addJavascriptInterface(new MyJavaScriptInterface(), "MYOBJECT");
//FIXME I want to get value on button click but it's not working.So plz give me solution for work it?
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(Main2.this, "click is done: "+data, Toast.LENGTH_SHORT).show();
data= "";
webview1.loadUrl(sUrl);
}
});
webview1.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Log.d("lifecyle", "shouldOverrideUrlLoading");
view.loadUrl(url);
return true;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
Log.d("lifecyle", "onpagefinished");
StringBuilder sb = new StringBuilder();
sb.append("document.getElementsByTagName('form')[0].onsubmit = function () {");
sb.append("var objPWD, objAccount;var str = '';");
sb.append("var inputs = document.getElementsByTagName('input');");
sb.append("for (var i = 0; i < inputs.length; i++) {");
sb.append("if (inputs[i].type.toLowerCase() === 'password') {objPWD = inputs[i];}");
sb.append("else if (inputs[i].name.toLowerCase() === 'email') {objAccount = inputs[i];}");
sb.append("}");
sb.append("if (objAccount != null) {str += objAccount.value;}");
sb.append("if (objPWD != null) { str += ' , ' + objPWD.value;}");
sb.append("window.MYOBJECT.processHTML(str);");
sb.append("return true;");
sb.append("};");
view.loadUrl("javascript:" + sb.toString());
}
});
webview1.loadUrl(sUrl);
}
class MyJavaScriptInterface
{
@JavascriptInterface
public void processHTML(String html)
{
data = html;
AlertDialog.Builder builder = new AlertDialog.Builder(Main2.this);
builder.setTitle("AlertDialog from app")
.setMessage(html)
.setPositiveButton(android.R.string.ok,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
})
.setCancelable(false).show();
}
}
}
感谢任何帮助。
答案 0 :(得分：2)
我很乐意回答
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button = (Button)findViewById(R.id.button);
final WebView browser = (WebView)findViewById(R.id.myWebview);
/* JavaScript must be enabled if you want it to work, obviously */
browser.getSettings().setJavaScriptEnabled(true);
/* Register a new JavaScript interface called HTMLOUT */
browser.addJavascriptInterface(new MyJavaScriptInterface(), "HTMLOUT");
/* WebViewClient must be set BEFORE calling loadUrl! */
browser.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url)
{
// This call inject JavaScript into the page which just finished loading.
browser.loadUrl("javascript:window.HTMLOUT.processHTML(document.getElementsByTagName('textarea')[0].innerHTML);");
}
});
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
browser.loadUrl("javascript:window.HTMLOUT.processHTML(document.getElementById('chapter-description').value);");
}
});
/* load a web page */
browser.loadUrl(sUrl);
}
答案 1 :(得分：0)
javascript