Android十八章：5分钟接入微信支付

   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

 <receiver
            android:name="包名.AppRegister">
            <intent-filter>
                <action android:name="com.tencent.mm.plugin.openapi.Intent.ACTION_REFRESH_WXAPP" />
            </intent-filter>
        </receiver>

<activity
        android:name="包名.wxapi.WXPayEntryActivity"
        android:exported="true"
        android:launchMode="singleTop"/>

 <data android:scheme="微信appid"/>

      private  PayReq mReq
      private  IWXAPI mWxapi
    @Override
    protected void onCreate(Bundle savedInstanceState) {
           mReq=new PayReq();
           mWxapi=WXAPIFactory.createWXAPI(this,null);


}

     public void pay(){
         //判断微信是否安装
         if(!isSupportPay()){
              return;
}

   //向app服务器提交商品名金额，获取预订单，商户id，加密信息，时间戳等后...

           mReq.appId = "appid";
          mReq.partnerId = "mch_id";
          mReq.prepayId = "prepay_id";
          mReq.packageValue = "Sign=WXPay";
          mReq.nonceStr ="nonce_str";
          mReq.timeStamp = "TimeStamp";
           mReq.sign = "signParams";
           mWxapi.registerApp("appid");
           mWxapi.sendReq(req);//拉起微信支付界面
}

private boolean isSupportPay(){


  if(mWxapi.isWXAppInstalled()&&mWxapi.isWXAppSupportAPI()){
               return true;
    }else{
       Toast.makeText(mContext, "请安装最新版微信", Toast.LENGTH_SHORT).show();
          return false;
    }
}

   WXPayEntryActivity.java

   private IWXAPI wxapi;

  public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler {

       @Override
    protected void onCreate(Bundle savedInstanceState) {
          wxapi = WXAPIFactory.createWXAPI(this, "wxappid");
         wxapi.handleIntent(getIntent(), this);

   }
    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        wxapi.handleIntent(intent, this);
  }
   @Override
    public void onReq(BaseReq req) {
        // TODO Auto-generated method stub

    }

   //微信通知app客户端
    @Override
    public void onResp(BaseResp resp) {
    if (resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) {

    switch(resp.errCode){
      case 0:
        //支付成功
        break;
      case -1:
        //未签名app
        break;
      case -2:
        //取消支付
        break;
      default:
        //支付失败
        break;

         }
      }

   }
 }