Android webview 里面发起的微信支付

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那些年微信支付的坑

Android webview 里面发起微信支付怎么实现？

1.申请h5微信支付（目前申请不到）
2.利用webview 里面调用 Java里面的方法实现发起微信sdk支付
3.http://blog.csdn.net/you4580/article/details/51275846 具体怎么写的url拼接我也不清楚，没有实现

目前我使用的是第二种方案
利用js调用Java的方法实现网上很多相关的方案

php里面调用 // 调起Android Java方法
window.android.sendReq(”传入对应参数“)

//Android 里面写法
webView.addJavascriptInterface(new Pay(),”android”);

public class Pay{    @JavascriptInterface    public void sendReq("接收对应相关参数"){        if (!isWeixinAvilible(MainActivity.this)){            ToastUtils.show("您还没有安装微信,请先安装微信");            return;        }   IWXAPI api = WXAPIFactory.createWXAPI(MainActivity.this, WX_APP_ID);   api.registerApp(WX_APP_ID);   PayReq payRequest = new PayReq();   payRequest.appId = WX_APP_ID;//微信开放平台审核通过的应用APPID   payRequest.partnerId = partnerId;//微信支付分配的商户号   payRequest.prepayId = prepayId;//微信返回的支付交易会话ID    预支付订单号   payRequest.packageValue = "Sign=WXPay";//固定字符串   payRequest.nonceStr = nonceStr;//随机字符串，不长于32位。推荐随机数生成算法   payRequest.timeStamp = timeStamp;//时间戳，请见接口规则-参数规定   payRequest.extData = "app data";   //签名算法生成 所有的键值必须小写，参数固定这些微信官方的生成算法有问题 这里查阅资料   http://www.jianshu.com/p/38bb30f67f69   SortedMap<Object,Object> parameters = new TreeMap<Object,Object>();   parameters.put("appid", WX_APP_ID);   parameters.put("noncestr", nonceStr);//随机字符串   parameters.put("package", packageValue);   parameters.put("partnerid", partnerId);   parameters.put("prepayid", prepayId);   parameters.put("timestamp", timeStamp);   payRequest.sign = createSign("UTF-8",parameters);   api.sendReq(payRequest);   }}

/**
*微信支付签名算法sign
* @param characterEncoding
* @param parameters
* @return
*/

    public static String createSign(String characterEncoding, SortedMap<Object, Object> parameters) {            StringBuffer sb = new StringBuffer();            Set es = parameters.entrySet();// 所有参与传参的参数按照accsii排序（升序）            Iterator it = es.iterator();            while (it.hasNext()) {                @SuppressWarnings("rawtypes")                Map.Entry entry = (Map.Entry) it.next();                String k = (String) entry.getKey();                Object v = entry.getValue();                if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {                    sb.append(k + "=" + v + "&");                }            }            sb.append("key=" + "商户密匙"); //KEY是商户秘钥            String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding)                    .toUpperCase();            return sign; // D3A5D13E7838E1D453F4F2EA526C4766            // D3A5D13E7838E1D453F4F2EA526C4766        }public class MD5Util {    private static String byteArrayToHexString(byte b[]) {        StringBuffer resultSb = new StringBuffer();        for (int i = 0; i < b.length; i++)            resultSb.append(byteToHexString(b[i]));        return resultSb.toString();    }    private static String byteToHexString(byte b) {        int n = b;        if (n < 0)            n += 256;        int d1 = n / 16;        int d2 = n % 16;        return hexDigits[d1] + hexDigits[d2];    }    public static String MD5Encode(String origin, String charsetname) {        String resultString = null;        try {            resultString = new String(origin);            MessageDigest md = MessageDigest.getInstance("MD5");            if (charsetname == null || "".equals(charsetname))                resultString = byteArrayToHexString(md.digest(resultString                        .getBytes()));            else                resultString = byteArrayToHexString(md.digest(resultString                        .getBytes(charsetname)));        } catch (Exception exception) {        }        return resultString;    }    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };}

微信支付回调（对应包名下面的包名.wxapi.WXPayEntryActivity）

<activity android:name=".wxapi.WXPayEntryActivity"        android:configChanges="keyboardHidden|orientation|screenSize"        android:exported="true"        android:screenOrientation="portrait"        android:theme="@android:style/Theme.Translucent.NoTitleBar">        <intent-filter>            <action android:name="android.intent.action.VIEW"/>            <category android:name="android.intent.category.DEFAULT"/>            <data android:scheme="微信appid"/> <!-- 需修改 -->        </intent-filter>   </activity>

微信支付回调类

public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler {private IWXAPI api;@Overridepublic void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.pay_result);//随便放一个布局就行主要用于回调    api = WXAPIFactory.createWXAPI(this, getResources().getString(R.string.weixinappid));    api.handleIntent(getIntent(), this);    }    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        setIntent(intent);        api.handleIntent(intent, this);    }    @Override    public void onReq(BaseReq req) {    }    @Override    public void onResp(BaseResp resp) {        EventBus.getDefault().post(new EventMsg(resp));        finish();//这里使用是因为微信有个透明页面必须finish    }}

最后有个回传回调结果问题
在WXPayEntryActivity 里面使用eventbus

    @Override    public void onResp(BaseResp resp) {        EventBus.getDefault().post(new EventMsg(resp));        finish();    }public class EventMsg {    private BaseResp resp;    public BaseResp getBaseReq() {        return resp;    }    public EventMsg(BaseResp resp) {        this.resp = resp;    }}

在调用发起微信支付webview的页面注册
EventBus.getDefault().register(MainActivity.this);

public void onEventMainThread(EventMsg msg){        Log.e("aaa",msg.getBaseReq().errCode+"");        BaseResp resp = msg.getBaseReq();        if (resp.errCode == 0){            ToastUtils.show("支付成功");        }else if(resp.errCode == -1){            Toast.makeText(this, "支付失败" + resp.errCode + "str:" + resp.errStr, Toast.LENGTH_SHORT).show();        }else if(resp.errCode == -2){            Toast.makeText(this, "支付取消", Toast.LENGTH_SHORT).show();        }else {            Toast.makeText(this, "支付出错", Toast.LENGTH_SHORT).show();        }    }

有注册就有销毁

@Override    protected void onDestroy() {        super.onDestroy();        webView.stopLoading();        webView.removeAllViews();        webView.destroy();        webView = null;       EventBus.getDefault().unregister(MainActivity.this);    }

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