When I scan my NFC tag, my application fires up and does what it have to do , but the tabhost goes missing. The mainactivity.java is where I initialize the tabhost with 3 tabs and this following first part of the code is one of the tab in which I utilize the NFC reading function. Is this because of the pendingintent? I don’t really know how to fix it, do I have to implement the 3 tabs in every activity layout?
My code:
package com.example.ponpon;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.nfc.NdefMessage;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.os.Parcelable;
import android.os.PatternMatcher;
import android.preference.Preference;
import android.preference.PreferenceManager;
import android.provider.Settings;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;
@TargetApi(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[11];
@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 = (ImageView)findViewById(R.id.imageView1);
if(storedPreference!=10)
{
img.setImageResource(images[storedPreference]);
img.invalidate();
}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(false);
builder.setTitle("Coupon Redemption");
builder.setMessage("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]);
img.invalidate();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
img.setImageResource(images[10]);
img.invalidate();
}
});
builder.show();
}
//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);
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 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 onDestroy() {
super.onDestroy();
// 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
public void onBackPressed() {
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();
super.onBackPressed();
}
@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.contains("ichatime.com"))
{
final ImageView img = (ImageView)findViewById(R.id.imageView1);
/*if (storedPreference!=10)
{
Toast.makeText(getApplicationContext(), "Coupon collected!", Toast.LENGTH_SHORT).show();
storedPreference++;
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedInt", storedPreference);
img.setImageResource(images[storedPreference]);
img.invalidate();
}*/
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]);
img.invalidate();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
img.setImageResource(images[10]);
img.invalidate();
}
});
builder.show();
}
else
{
Toast.makeText(getApplicationContext(), "Coupon collected!", Toast.LENGTH_SHORT).show();
storedPreference++;
SharedPreferences.Editor editor = preferences.edit();
editor.putInt("storedInt", storedPreference);
editor.commit();
img.setImageResource(images[storedPreference]);
img.invalidate();
}}
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();
}
}
}
}
and also, my main activity:
package com.example.ponpon;
import android.os.Bundle;
import android.app.TabActivity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
public class MainActivity extends TabActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabHost tabHost = getTabHost();
TabSpec spec1=tabHost.newTabSpec("Coupon Manager");
spec1.setContent(R.id.tab1);
spec1.setIndicator("Coupons");
Intent CouponsIntent = new Intent(this, CouponManager.class);
spec1.setContent(CouponsIntent);
TabSpec spec2=tabHost.newTabSpec("Help");
spec2.setIndicator("Help");
spec2.setContent(R.id.tab2);
Intent SettingsIntent = new Intent(this, Settings.class);
spec2.setContent(SettingsIntent);
TabSpec spec3=tabHost.newTabSpec("Write[Vendor]");
spec3.setIndicator("Write\n[Vendor]");
spec3.setContent(R.id.tab3);
Intent HelpIntent = new Intent(this, HelpActivity.class);
spec3.setContent(HelpIntent);
tabHost.addTab(spec1);
tabHost.addTab(spec2);
tabHost.addTab(spec3);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Take a close look at your logic: you have
You should consider replacing the contents of the
elseblock with thestoredPreference!=10block, then getting rid of that first block. All you need isif storedPreference==10andelse.