android与h5简单交互（js调取android的拨打电话功能）

public class MainActivity extends AppCompatActivity {    public static final int REQUEST_CALL_PERMISSION = 101; //拨号请求码    public static final String TAG = "TAG";    private WebView mWebView;    @SuppressLint("SetJavaScriptEnabled")    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mWebView = (WebView) findViewById(R.id.webView);        //加载本地html文件        mWebView.loadUrl("file:///android_asset/index.html");        //设置java可以调用js方法        WebSettings webSettings = mWebView.getSettings();        webSettings.setJavaScriptEnabled(true);        //定义JsInteration方法，供js调用        mWebView.addJavascriptInterface(new JsInteration(), "android");    }    //Android调用有返回值js方法    @TargetApi(Build.VERSION_CODES.KITKAT)    public void onClick(View v) {        mWebView.evaluateJavascript("sum(1,2)", new ValueCallback() {            @Override            public void onReceiveValue(String value) {                //Log.e(TAG, "onReceiveValue value=" + value);                Toast.makeText(MainActivity.this, "android调用js得到的结果是：" + value, Toast.LENGTH_SHORT).show();            }        });    }    public class JsInteration {        @JavascriptInterface        public void back() {            checkReadPermission(Manifest.permission.CALL_PHONE, REQUEST_CALL_PERMISSION);            call("tel:" + "10000");        }    }    /**     * 判断是否有某项权限     *     * @param string_permission 权限     * @param request_code      请求码     * @return     */    public boolean checkReadPermission(String string_permission, int request_code) {        boolean flag = false;        if (ContextCompat.checkSelfPermission(this, string_permission) == PackageManager.PERMISSION_GRANTED) {//已有权限            flag = true;        } else {//申请权限            ActivityCompat.requestPermissions(this, new String[]{string_permission}, request_code);        }        return flag;    }    /**     * 检查权限后的回调     *     * @param requestCode  请求码     * @param permissions  权限     * @param grantResults 结果     */    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        switch (requestCode) {            case REQUEST_CALL_PERMISSION: //拨打电话                if (permissions.length != 0 && grantResults[0] != PackageManager.PERMISSION_GRANTED) {//失败                    Toast.makeText(this, "请允许拨号权限后再试", Toast.LENGTH_SHORT).show();                } else {//成功                    //call("tel:"+"10086");                    //Toast.makeText(this, "10000", Toast.LENGTH_SHORT).show();                    call("tel:" + "10000");                }                break;        }    }    /**     * 拨打电话（直接拨打）     *     * @param telPhone 电话     */    public void call(String telPhone) {        if (checkReadPermission(Manifest.permission.CALL_PHONE, REQUEST_CALL_PERMISSION)) {            Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse(telPhone));            startActivity(intent);        }    }}

//index.html

//xml文件

<?xml version="1.0" encoding="utf-8"?>

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