最近、作業中のゲームのアプリ課金に実装しようとしていますが、NullPointerExceptionが発生し、その理由がわかりません。
BuyActivity.java：
package com.liamw.games.whatami;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.provider.Settings.Secure;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.liamw.games.whatami.util.IabHelper;
import com.liamw.games.whatami.util.IabResult;
import com.liamw.games.whatami.util.Inventory;
import com.liamw.games.whatami.util.Purchase;
public class BuyActivity extends Activity {
String key, androidid;
IabHelper mHelper;
Button fifty;
ProgressDialog wait;
@Override
protected void onCreate(Bundle savedInstanceState) {
// DONE Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_buy);
fifty = (Button) findViewById(R.id.b50hints);
androidid = Secure.getString(BuyActivity.this.getContentResolver(),
Secure.ANDROID_ID);
final ProgressDialog wait = new ProgressDialog(this);
wait.setTitle("Updating...");
wait.setMessage("Please wait while the details are loaded...");
wait.setCancelable(false);
wait.show();
key = "xxxxx";
mHelper = new IabHelper(this, key);
mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
public void onIabSetupFinished(IabResult result) {
if (!result.isSuccess()) {
// Oh noes, there was a problem.
Log.d("What Am I - IAB",
"Problem setting up In-app Billing: " + result);
}
// Hooray, IAB is fully set up!
List<String> additionalSkuList = new ArrayList<String>();
additionalSkuList.add("50hints");
mHelper.queryInventoryAsync(true, additionalSkuList,
mQueryFinishedListener);
}
});
fifty.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
mHelper.launchPurchaseFlow(BuyActivity.this, "50hints", 10001,
mPurchaseFinishedListener, androidid);
fifty.setEnabled(false);
}
});
}
IabHelper.QueryInventoryFinishedListener mQueryFinishedListener = new IabHelper.QueryInventoryFinishedListener() {
public void onQueryInventoryFinished(IabResult result,
Inventory inventory) {
if (result.isFailure()) {
// handle error
return;
}
String fiftyhintscost = inventory.getSkuDetails("50hints").getPrice();
fifty.setText("50 Hints: " + fiftyhintscost);
wait.dismiss();
// update the UI
}
};
IabHelper.OnIabPurchaseFinishedListener mPurchaseFinishedListener = new IabHelper.OnIabPurchaseFinishedListener() {
public void onIabPurchaseFinished(IabResult result, Purchase purchase) {
if (result.isFailure()) {
Log.d("What Am I? IAB", "Error purchasing: " + result);
return;
} else if (purchase.getSku().equals("50hints")
&& purchase.getDeveloperPayload().equals(androidid)) {
// consume the gas and update the UI
mHelper.consumeAsync(purchase, mConsumeFinishedListener);
}
fifty.setEnabled(true);
}
};
IabHelper.OnConsumeFinishedListener mConsumeFinishedListener = new IabHelper.OnConsumeFinishedListener() {
public void onConsumeFinished(Purchase purchase, IabResult result) {
if (result.isSuccess()) {
// provision the in-app purchase to the user
// (for example, credit 50 gold coins to player's character)
Toast.makeText(BuyActivity.this,
"Purchase Successful - Crediting!", Toast.LENGTH_LONG)
.show();
} else {
// handle error
}
}
};
@Override
public void onDestroy() {
if (mHelper != null)
mHelper.dispose();
mHelper = null;
super.onDestroy();
}
}
Logcat：
01-18 19:12:45.829: E/AndroidRuntime(16849): FATAL EXCEPTION: main
01-18 19:12:45.829: E/AndroidRuntime(16849): java.lang.NullPointerException
01-18 19:12:45.829: E/AndroidRuntime(16849): at com.liamw.games.whatami.BuyActivity$1.onQueryInventoryFinished(BuyActivity.java:87)
01-18 19:12:45.829: E/AndroidRuntime(16849): at com.liamw.games.whatami.util.IabHelper$2$1.run(IabHelper.java:533)
01-18 19:12:45.829: E/AndroidRuntime(16849): at android.os.Handler.handleCallback(Handler.java:725)
01-18 19:12:45.829: E/AndroidRuntime(16849): at android.os.Handler.dispatchMessage(Handler.java:92)
01-18 19:12:45.829: E/AndroidRuntime(16849): at android.os.Looper.loop(Looper.java:137)
01-18 19:12:45.829: E/AndroidRuntime(16849): at android.app.ActivityThread.main(ActivityThread.java:5039)
01-18 19:12:45.829: E/AndroidRuntime(16849): at java.lang.reflect.Method.invokeNative(Native Method)
01-18 19:12:45.829: E/AndroidRuntime(16849): at java.lang.reflect.Method.invoke(Method.java:511)
01-18 19:12:45.829: E/AndroidRuntime(16849): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-18 19:12:45.829: E/AndroidRuntime(16849): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-18 19:12:45.829: E/AndroidRuntime(16849): at dalvik.system.NativeStart.main(Native Method)
87行目：
String fiftyhintscost = inventory.getSkuDetails("50hints").getPrice();
NullPointerのソースを見つけて、それを修正する方法を教えてください...