android js 互调

public class BoatsActivity extends Activity {
Handler mHandler = new Handler();//处理消息的handler
@SuppressLint("SetJavaScriptEnabled")
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setTitle("船舶查询页面");
final WebView mWebView = new WebView(this);//创建一个webView对象出来  将他作为activity的显示页面  你也可以在xml布局文件中放入一个webView控件在这里初始化
setContentView(mWebView);
mWebView.loadUrl("http://192.168.0.190:8080/loginDemo_gd/bots.html");//加载你要显示的网页
mWebView.getSettings().setJavaScriptEnabled(true);//获取webview对象中的setting对象 设置为可以支持javascript
mWebView.addJavascriptInterface(new Object() {
@JavascriptInterface//sdk版本大于17要加上这句注解 访问安全考虑
public void clickOnAndroid() {
mHandler.post(new Runnable() {
public void run() {
Toast.makeText(BoatsActivity.this, "请输入你要查询的船舶", Toast.LENGTH_SHORT).show();
}
});
}
@JavascriptInterface
public void showmsg(){
mHandler.post(new Runnable() {
public void run() {
Toast.makeText(BoatsActivity.this, "查询成功", Toast.LENGTH_SHORT).show();
}
});
}
@JavascriptInterface
public void showResult(){
mHandler.post(new Runnable() {
public void run() {
Toast.makeText(BoatsActivity.this, "没有查询到对应的数据", Toast.LENGTH_SHORT).show();
}
});
}
@JavascriptInterface
public void alert(){
mHandler.post(new Runnable() {
public void run() {
Toast.makeText(BoatsActivity.this, "请输入船舶的ID", Toast.LENGTH_SHORT).show();
}
});
}

}, "demo");//类的别名  js这样调用  window.demo.方法名(js调用java方法)

　　　　　　//java调用js
　　　　　　webView.loadUrl("javascript:window.handler.show(document.getElementById('id').value,document.getElementById('password').value)");

mWebView.setWebViewClient(new WebViewClient(){
@Override
public void onPageFinished(WebView view, String url) {
//Toast.makeText(BoatsActivity.this, "加载完成", Toast.LENGTH_SHORT).show();
super.onPageFinished(view, url);
}
});
}

}