嗨,我如何在 android 中将字符串转换为 bigdecimal。
这是我的第一个活动:
public class ViewCartActivity extends Activity {
String mGrandTotal;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.viewcartactivity);
ListView mLstView1 = (ListView) findViewById(R.id.listView1);
TextView mTxtViewGrandTotal = (TextView) findViewById(R.id.mTxtViewGrandTotalValue);
Button mBtnSubmit = (Button) findViewById(R.id.mBtnSubmit);
ViewCartAdapter mViewCartAdpt = new ViewCartAdapter(
ViewCartActivity.this);
mLstView1.setAdapter(mViewCartAdpt);
if (Constants.mItem_Detail.size() > 0) {
Double mGTotal = Double.parseDouble(Constants.mItem_Detail.get(0)
.get(SingleMenuItem.KEY_TOTAL));
for (int i = 1; i < Constants.mItem_Detail.size(); i++) {
mGTotal = mGTotal
+ Double.parseDouble(Constants.mItem_Detail.get(i).get(
SingleMenuItem.KEY_TOTAL));
}
mGrandTotal = String.valueOf(mGTotal);
mTxtViewGrandTotal.setText("$" + mGrandTotal);
}
mBtnSubmit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(getApplicationContext(), CustomerLogin.class);
i.putExtra("GrandTotal", mGrandTotal);
startActivity(i);
}
CustomerLogin.java(下一个活动):
String mGrandTotal;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.customer_login);
Bundle b = getIntent().getExtras();
String total = b.getString("GrandTotal");
-----
------
if(isUserValidated && isPasswordValidated)
{
String s= getIntent().getStringExtra(mGrandTotal);
Intent intent = new Intent(CustomerLogin.this,PayPalIntegrationActivity.class);
intent.putExtra(mGrandTotal, s);
startActivity(intent);
}
PayPalIntegrationActivity.java(第三个活动)看起来像:
public class PayPalIntegrationActivity extends Activity implements OnClickListener {
String mGrandTotal;
private PayPal mPayPal;
private CheckoutButton launchPayPalButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pay_pal_integration);
-------
------
@Override
public void onClick(View v) {
payWithPaypal();
}
private PayPalPayment payWithPaypal() {
PayPalPayment newPayment = new PayPalPayment();
Intent in = getIntent();
String total = in.getStringExtra(mGrandTotal);
BigDecimal sPrice = new BigDecimal(total);
newPayment.setSubtotal(sPrice);
newPayment.setCurrencyType(Currency.getInstance(Locale.US));
我必须将总价值传递给我的 paypalintegration 活动。
但我的控制台窗口显示以下错误:
12-21 05:52:09.571: E/AndroidRuntime(782): FATAL EXCEPTION: main
12-21 05:52:09.571: E/AndroidRuntime(782): java.lang.NullPointerException
12-21 05:52:09.571: E/AndroidRuntime(782): at java.math.BigDecimal.<init>(BigDecimal.java:483)
12-21 05:52:09.571: E/AndroidRuntime(782): at com.ssmobileproductions.catalogue.PayPalIntegrationActivity.payWithPaypal(PayPalIntegrationActivity.java:74)
12-21 05:52:09.571: E/AndroidRuntime(782): at com.ssmobileproductions.catalogue.PayPalIntegrationActivity.onClick(PayPalIntegrationActivity.java:66)
12-21 05:52:09.571: E/AndroidRuntime(782): at android.view.View.performClick(View.java:2408)
请帮助我。我的代码有什么问题。
I wish to need the o/p
是:
mGrandTotal 值是从我的第一个活动传递到最后一个活动(paypalintegration 活动)
mGrandTotal 值设置为以下行: newPayment.setSubtotal(sPrice);
我该怎么办。请告诉我