......
compile files('libs/alipaySdk-20170725.jar')
......

<activity
 android:name="com.alipay.sdk.app.H5PayActivity"
 android:configChanges="orientation|keyboardHidden|navigation|screenSize"
 android:exported="false"
 android:screenOrientation="behind"
 android:windowSoftInputMode="adjustResize|stateHidden" >
</activity>
 <activity
 android:name="com.alipay.sdk.app.H5AuthActivity"
 android:configChanges="orientation|keyboardHidden|navigation"
 android:exported="false"
 android:screenOrientation="behind"
 android:windowSoftInputMode="adjustResize|stateHidden" >
</activity>

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

public class PayResult {
 private String resultStatus;
 private String result;
 private String memo;
 public PayResult(Map<String, String> rawResult) {
  if (rawResult == null) {
   return;
  }
  for (String key : rawResult.keySet()) {
   if (TextUtils.equals(key, "resultStatus")) {
    resultStatus = rawResult.get(key);
   } else if (TextUtils.equals(key, "result")) {
    result = rawResult.get(key);
   } else if (TextUtils.equals(key, "memo")) {
    memo = rawResult.get(key);
   }
  }
 }
 @Override
 public String toString() {
  return "resultStatus={" + resultStatus + "};memo={" + memo
    + "};result={" + result + "}";
 }
 /**
  * @return the resultStatus
  */
 public String getResultStatus() {
  return resultStatus;
 }
 /**
  * @return the memo
  */
 public String getMemo() {
  return memo;
 }
 /**
  * @return the result
  */
 public String getResult() {
  return result;
 }
}

private static final int SDK_PAY_FLAG = 1;
// 訂單信息
final String orderInfo = info; 
Runnable payRunnable = new Runnable() {
@Override
 public void run() {
  PayTask alipay = new PayTask(PayDemoActivity.this);
  Map<String, String> result = alipay.payV2(orderInfo, true);
  Message msg = new Message();
  msg.what = SDK_PAY_FLAG;
  msg.obj = result;
  mHandler.sendMessage(msg);
 }
};
Thread payThread = new Thread(payRunnable);
payThread.start();

@SuppressLint("HandlerLeak")
 private Handler mHandler = new Handler() {
  @SuppressWarnings("unused")
  public void handleMessage(Message msg) {
   switch (msg.what) {
   case SDK_PAY_FLAG: {
    @SuppressWarnings("unchecked")
    PayResult payResult = new PayResult((Map<String, String>) msg.obj);
    /**
     對(duì)于支付結(jié)果，請(qǐng)商戶(hù)依賴(lài)服務(wù)端的異步通知結(jié)果。同步通知結(jié)果，僅作為支付結(jié)束的通知。
     */
    String resultInfo = payResult.getResult();// 同步返回需要驗(yàn)證的信息
    String resultStatus = payResult.getResultStatus();
    // 判斷resultStatus 為9000則代表支付成功
    if (TextUtils.equals(resultStatus, "9000")) {
     // 該筆訂單是否真實(shí)支付成功，需要依賴(lài)服務(wù)端的異步通知。
     Toast.makeText(PayDemoActivity.this, "支付成功", Toast.LENGTH_SHORT).show();
    } else {
     // 該筆訂單真實(shí)的支付結(jié)果，需要依賴(lài)服務(wù)端的異步通知。
     Toast.makeText(PayDemoActivity.this, "支付失敗", Toast.LENGTH_SHORT).show();
    }
    break;
   }
   default:
    break;
   }
  };
 };

public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler{
 private static final String TAG = "WXPayEntryActivity";
 private IWXAPI api;
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.pay_result);
  
  api = WXAPIFactory.createWXAPI(this, Constants.APP_ID);
  api.handleIntent(getIntent(), this);
  /*
  * 在這里去做跟后臺(tái)服務(wù)器的請(qǐng)求，
  * 獲取需要的簽名信息，然后調(diào)起微信支付。
  **/
 }
 @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) {
  Log.d(TAG, "onPayFinish, errCode = " + resp.errCode);
  switch(resp.errCode){
   case 0:
   //支付成功，做自己想做的處理
   break;
   case -1:
   //可能的原因：簽名錯(cuò)誤、未注冊(cè)APPID、項(xiàng)目設(shè)置APPID不正確、注冊(cè)的APPID與設(shè)置的不匹配、其他異常等。
   break;
   case -2：
   //用戶(hù)取消.無(wú)需處理。發(fā)生場(chǎng)景：用戶(hù)不支付了，點(diǎn)擊取消，返回APP。
   break;
   default:
   break
  }
 }
}