webview js和java相互呼叫

android與webview相互呼叫

java中呼叫javascript
javascript 呼叫 java方法

public class MainActivity extends AppCompatActivity {

    private WebView webview;
    private LinearLayout activity_main;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        webview.setWebChromeClient(new WebChromeClient(){
            @Override
            public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
                return super.onJsAlert(view, url, message, result);
            }
        });
        webview.getSettings().setJavaScriptEnabled(true);
        //新增呼叫Javascript介面方法   類的方法需要加上註解
        //引數一：呼叫介面 類的例項
        //引數二：與後段定義的  協議   onclick="window.and.openC()"
        webview.addJavascriptInterface(new HEHE(),"and");
        webview.loadUrl("file:///android_asset/web.html");
    }

    public void onclick(View view) {
        //呼叫 html的程式碼
        webview.loadUrl("javascript:open()");
    }

    private void initView() {
        webview = (WebView) findViewById(R.id.webview);
        activity_main = (LinearLayout) findViewById(R.id.activity_main);
    }

    public class HEHE{   //提供給html程式碼呼叫
        @JavascriptInterface
        public void openC(){
            startActivity(new Intent(MediaStore.ACTION_IMAGE_CAPTURE));
        }
    }
}