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public class MainActivity extends Activity {
WebView webView;
Button buttonLeft, buttonRight;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = findViewById(R.id.webview);
buttonLeft = findViewById(R.id.btnLeft);
buttonRight = findViewById(R.id.btnRight);
WebSettings webSettings = webView.getSettings();
//允許使用JS
webSettings.setJavaScriptEnabled(true);
// 設置允許JS彈窗
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webView.loadUrl("file:///android_asset/index.html");
buttonLeft.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
webView.post(new Runnable() {
@Override
public void run() {
webView.evaluateJavascript("javascript:callJS()", new ValueCallback<String>() {
@Override
public void onReceiveValue(String s) {
//將button顯示的文字改成JS返回的字符串
buttonLeft.setText(s);
}
});
}
});
}
});
webView.setWebChromeClient(new WebChromeClient() {
@Override
public boolean onJsAlert(WebView view, String url, String message, final JsResult result) {
AlertDialog.Builder b = new AlertDialog.Builder(MainActivity.this);
b.setTitle("alert1");
b.setMessage(message);
b.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
result.confirm();
}
});
b.setCancelable(false);
b.create().show();
return true;
}
});
}
}
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