Thanks to the replies on NFC and a few certain things, I’ve understood and managed to compile a code in which the users will be able to read a tag, and if the tag contains a string that is similar to my code, a coupon will be added (image changes) and an integer goes up by 1. This integer will be saved by SharedPreferences and it is used to determine how many coupons the users have collected and show it onResume.
However, after compiling, when I try to run it, my application stops immediately. Can someone help me check on what I may have go wrong? I know it’s kinda long but I really have no idea what went wrong.
@TargetApi(10)
//I have to use this line of code because I'm targetted to code at API 8 but some NFC functionalities that I use requires API 10.
public class CouponManager extends Activity {
private static final String TAG = "NFCReadTag";
private NfcAdapter mNfcAdapter;
private IntentFilter[] mNdefExchangeFilters;
private PendingIntent mNfcPendingIntent;
public static final String PREF_FILE_NAME = "PrefFile";
private int[] images = new int[10];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.coupon_layout);
//List of images
images[0]=R.drawable.cp0;
images[1]=R.drawable.cp1;
images[2]=R.drawable.cp2;
images[3]=R.drawable.cp3;
images[4]=R.drawable.cp4;
images[5]=R.drawable.cp5;
images[6]=R.drawable.cp6;
images[7]=R.drawable.cp7;
images[8]=R.drawable.cp8;
images[9]=R.drawable.cp9;
images[10]=R.drawable.cp10;
//Restore preferences
SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);
int storedPreference = preferences.getInt("storedInt", 0);
//Image to use depending on coupon collected
final ImageView img = new ImageView(this);
if(storedPreference!=10)
{
img.setImageResource(images[storedPreference]);
}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(false);
builder.setTitle("Redeem Your Coupon?");
builder.setInverseBackgroundForced(true);
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedInt", 0); // value to store
editor.commit();
img.setImageResource(images[0]);
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
img.setImageResource(images[10]);
}
});
}
//Check and send Intent from NFC tag discovered
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
mNfcPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,
getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP
| Intent.FLAG_ACTIVITY_CLEAR_TOP), 0);
IntentFilter coupontag = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
coupontag.addDataScheme("http");
coupontag.addDataAuthority("www.ichatime.com", null);
coupontag.addDataPath(".*", PatternMatcher.PATTERN_SIMPLE_GLOB);
mNdefExchangeFilters = new IntentFilter[] { coupontag };
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
protected void onResume() {
super.onResume();
if(mNfcAdapter != null) {
mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent,
mNdefExchangeFilters, null);
} else {
Toast.makeText(getApplicationContext(), "Sorry, No NFC Adapter found.", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onPause() {
super.onPause();
if(mNfcAdapter != null) mNfcAdapter.disableForegroundDispatch(this);
}
@Override
protected void onStop() {
super.onStop();
// We need an Editor object to make preference changes.
// All objects are from android.context.Context
SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);
int storedPreference = preferences.getInt("storedInt", 0);
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedInt", storedPreference); // value to store
editor.commit();
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);
int storedPreference = preferences.getInt("storedInt", 0);
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
NdefMessage[] messages = null;
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if (rawMsgs != null) {
messages = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
messages[i] = (NdefMessage) rawMsgs[i];
}
}
if(messages[0] != null) {
String result="";
byte[] payload = messages[0].getRecords()[0].getPayload();
// this assumes that we get back am SOH followed by host/code
for (int b = 1; b<payload.length; b++) { // skip SOH
result += (char) payload[b];
}
if (result == "ichatime.com")
{
final ImageView img = new ImageView(this);
Toast.makeText(getApplicationContext(), "Coupon collected!", Toast.LENGTH_SHORT).show();
if (storedPreference!=10)
{
storedPreference++;
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedInt", storedPreference);
img.setImageResource(images[storedPreference]);
}
if (storedPreference==10)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(false);
builder.setTitle("Redeem Your Coupon?");
builder.setInverseBackgroundForced(true);
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which)
{
dialog.dismiss();
SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedInt", 0); // value to store
editor.commit();
img.setImageResource(images[0]);
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
img.setImageResource(images[10]);
}
});
}
else
{
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedInt", 10);
img.setImageResource(images[10]);
}}
else
{
Toast.makeText(getApplicationContext(), "Wrong tag detected!", Toast.LENGTH_SHORT).show();
}
//Debugging Mode to see what is contained in the tags.
// Toast.makeText(getApplicationContext(), "Tag Contains " + result, Toast.LENGTH_SHORT).show();
}
}
}
}
Logcat errors:
>11-26 01:16:11.869: D/AndroidRuntime(550): Shutting down VM
>
11-26 01:16:11.869: W/dalvikvm(550): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
>
11-26 01:16:11.929: I/dalvikvm(550): threadid=3: reacting to signal 3
>
11-26 01:16:11.979: E/AndroidRuntime(550): FATAL EXCEPTION: main
>
**11-26 01:16:11.979: E/AndroidRuntime(550): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ponpon/com.example.ponpon.MainActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ponpon/com.example.ponpon.CouponManager}: java.lang.ArrayIndexOutOfBoundsException: length=10; index=10**
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.access$600(ActivityThread.java:123)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.os.Handler.dispatchMessage(Handler.java:99)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.os.Looper.loop(Looper.java:137)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.main(ActivityThread.java:4424)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at java.lang.reflect.Method.invokeNative(Native Method)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at java.lang.reflect.Method.invoke(Method.java:511)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at dalvik.system.NativeStart.main(Native Method)
>
11-26 01:16:11.979: E/AndroidRuntime(550): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ponpon/com.example.ponpon.CouponManager}: java.lang.ArrayIndexOutOfBoundsException: length=10; index=10
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.startActivityNow(ActivityThread.java:1797)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:682)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.widget.TabHost.setCurrentTab(TabHost.java:346)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.widget.TabHost.addTab(TabHost.java:236)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at com.example.ponpon.MainActivity.onCreate(MainActivity.java:37)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.Activity.performCreate(Activity.java:4465)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
>
11-26 01:16:11.979: E/AndroidRuntime(550): ... 11 more
>
11-26 01:16:11.979: E/AndroidRuntime(550): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=10; index=10
>
11-26 01:16:11.979: E/AndroidRuntime(550): at com.example.ponpon.CouponManager.onCreate(CouponManager.java:53)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.Activity.performCreate(Activity.java:4465)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
>
11-26 01:16:11.979: E/AndroidRuntime(550): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
>
11-26 01:16:11.979: E/AndroidRuntime(550): ... 21 more
What did I do wrong with my arrays? Thanks for the clarification guys!
Your logcat is printing an ArrayOutOfBounds exception on your onCreate method.
The problem is that you are declaring a 10 items sized array, and then trying to put 11 items on it.
You have to declare a new int[11] array.