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例如，我在嘗試在novo.charAt（0）處接收值1後嘗試設置togglebutton（LeftLightButton）狀態和文本時出現了一些問題。主要的想法是，我點擊按鈕，它使webview.loadUrl，如果頁面更改爲我所期望的切換按鈕狀態應該是，如果不是，它必須保持關閉，反之亦然。現在的方式是，如果網站沒有更新到我期望的值，則不會更改文本。Android：切換按鈕不更新
public class MainActivity extends Activity {
private WebView webView;
private ToggleButton LeftLightButton;
private Thread webviewthread;
private String baseURL;
private boolean LeftLightButtonState;
public void onCreate(Bundle savedInstanceState) {
final Context context = this;
baseURL = "http://192.168.1.4/i.php";
LeftLightButton = (ToggleButton) findViewById(R.id.toggleButton1);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
runOnUiThread(new Runnable() {
public void run()
{
synchronized(this) {
webView = (WebView) findViewById(R.id.webView1);
webView.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(context, "HTMLOUT");
webView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
webView.loadUrl("javascript:window.HTMLOUT.processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
}
});
webView.loadUrl(baseURL);
}
}
});
showToast("Getting current status...");
}
public void notify(final boolean state, final ToggleButton buttonName) {
Thread thread = new Thread() {
@Override
public void run() {
synchronized (this) {
try {
wait(1000);
final ToggleButton button = (ToggleButton) findViewById(R.id.toggleButton1);
if (!state && button.isChecked()) {
showToast("Couldnt turn OFF");
// UI
runOnUiThread(new Runnable() {
@Override
public void run() {
button.setChecked(false);
button.setTextOff("OFF");
}
});
// end of UI
}
if (state && !button.isChecked()) {
showToast("Couldnt turn ON");
// UI
runOnUiThread(new Runnable() {
@Override
public void run() {
button.setChecked(true);
button.setTextOn("ON");
}
});
// end of UI
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
thread.start();
}
public void showToast(final String toast)
{
runOnUiThread(new Runnable() {
public void run()
{
Toast.makeText(MainActivity.this, toast, Toast.LENGTH_SHORT).show();
}
});
}
public void onClick(View arg0) {
final int id = arg0.getId();
switch (id) {
case R.id.toggleButton1:
if (LeftLightButtonState == true) {
webView.loadUrl(baseURL+"?L=0");
notify(false, LeftLightButton);
} else {
webView.loadUrl(baseURL+"?L=1");
notify(true, LeftLightButton);
}
break;
// even more buttons here
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void processHTML(String html) { // <html> <body> 1 0 0 0 </body> </html>
LeftLightButton = (ToggleButton) findViewById(R.id.toggleButton1);
String novo = android.text.Html.fromHtml(html).toString();
System.out.println("RECEIVED: "+novo);
if (novo != null) {
if (novo.charAt(0) == '0') {
LeftLightButtonState = false;
LeftLightButton.setTextOff("OFF");
LeftLightButton.setChecked(false);
}
if (novo.charAt(0) == '1') {
LeftLightButtonState = true;
LeftLightButton.setTextOn("ON");
LeftLightButton.setChecked(true);
}
System.out.println("CHEGUEI");
}
}
}