JS交互

一般html页面都会由网站发面的开发人员给出，所以一般我们就记住方法名就好了
package tuisong.wangyi.com.webviewstudy;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.WebSettings;
import android.webkit.WebView;

public class MainActivity extends AppCompatActivity {

private WebView web;

@SuppressLint("JavascriptInterface")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ------------------------------------------------------------------
    //找控件
    web = findViewById(R.id.web);
    //android调用网页
    WebSettings settings = web.getSettings();
    //设置
    settings.setJavaScriptEnabled(true);
    //加载网页
    web.loadUrl("file:///android_asset/info.html");

---

    //webview 长按事件
    web.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {

            web.loadUrl("javascript:test1()");

            return false;
        }
    });

---

    //调用android协议
    web.addJavascriptInterface(this,"android");

---

}
@JavascriptInterface
public void jump(){
    //跳转
    Intent intent = new Intent(MainActivity.this, Main2Activity.class);
    startActivity(intent);
}

}