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I have made an NFC tag writing app that has various options such as writing text,URL,toggle Wifi, Business Card etc.
The problem i am facing is when i click the write button after entering text. The app terminates on itself.
May be i am calling the wrong method.
Bir kullanıcı listeden URL yazmayı seçtiğinde bunu istiyorum. Ardından Yazma URL etkinliği başlamalı ve yazma düğmesine basıldığında Yazma etiketi. Şimdi yaz etiket düğmesine bastığımda. App "Maalesef uygulama durduruldu" diyor.NFC etiketi metin veya URL ile yazılamıyor
ListDisplay
package com.example.jordjr.projectwork;
import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class ListDisplay extends Activity implements AdapterView.OnItemClickListener {
// Array of strings...
ListView listview;
String[] mobileArray = {"Text", "URL", "Email", "Phone Number", "Wifi", "Business Card"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
ArrayAdapter adapter = new ArrayAdapter<String>(this, R.layout.activity_listview, mobileArray);
listview = (ListView) findViewById(R.id.mobile_list);
listview.setAdapter(adapter);
listview.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String item = ((TextView) view).getText().toString();
if(item.equalsIgnoreCase("text")){
Intent intent=new Intent (this,WriteUrl.class);
startActivity(intent);
}
else
if(item.equalsIgnoreCase("Phone Number")){
Intent intent=new Intent (this,PhoneNumber.class);
startActivity(intent);
}
else
if(item.equalsIgnoreCase("URL")) {
Intent intent = new Intent(this, WriteUrl.class);
startActivity(intent);
}
else
if(item.equalsIgnoreCase("Wifi")) {
Intent intent = new Intent(this,Wifi.class);
startActivity(intent);
}
else
if(item.equalsIgnoreCase("Email")) {
Intent intent = new Intent(this,WriteEmail.class);
startActivity(intent);
}
else
if(item.equalsIgnoreCase("Business Card")) {
Intent intent = new Intent(this, BusinessCard.class);
startActivity(intent);
}
}
}
Yaz URL paket com.example.jordjr.projectwork;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class WriteUrl extends AppCompatActivity {
NfcAdapter nfcAdapter;
Button button;
EditText txtTagContent;
int x=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_write_url);
nfcAdapter=NfcAdapter.getDefaultAdapter(this);
button = (Button)findViewById(R.id.button);
txtTagContent = (EditText)findViewById(R.id.txtTagContent);
}
@Override
protected void onResume() {
super.onResume();
enableForegroundDispatchSystem();
}
@Override
protected void onPause() {
super.onPause();
disableForegroundDispatchSystem();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void enableForegroundDispatchSystem()
{
Intent intent=new Intent(this, MainActivity.class).addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
IntentFilter[] intentFilters = new IntentFilter[] {};
nfcAdapter.enableForegroundDispatch(this, pendingIntent, intentFilters, null);
}
private void disableForegroundDispatchSystem()
{
nfcAdapter.disableForegroundDispatch(this);
}
private void formatTag(Tag tag,NdefMessage ndefMessage)
{
try
{
NdefFormatable ndefFormatable=NdefFormatable.get(tag);
if(ndefFormatable == null)
{
Toast.makeText(this, "This Tag is Not ndef Formatable!", Toast.LENGTH_SHORT).show();
}
ndefFormatable.connect();
ndefFormatable.format(ndefMessage);
ndefFormatable.close();
Toast.makeText(this, "Tag written", Toast.LENGTH_SHORT).show();
}
catch (Exception e)
{
Log.e("formatTag", e.getMessage());
}
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
if (x == 1) {
if (intent.hasExtra(NfcAdapter.EXTRA_TAG)) {
Toast.makeText(this, "NfcIntent!", Toast.LENGTH_SHORT).show();
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
NdefMessage ndefMessage = createNdefMessage(txtTagContent.getText() + "");
writeNdefMessage(tag, ndefMessage);
}
x=0;
}
}
private void writeNdefMessage(Tag tag, NdefMessage ndefMessage)
{
try
{
if(tag == null)
{
Toast.makeText(this, "Tag object cannot be null", Toast.LENGTH_SHORT).show();
return;
}
Ndef ndef = Ndef.get(tag);
if(ndef == null)
{
//formats tag with the ndef format and writes the message
formatTag(tag, ndefMessage);
}
else
{
ndef.connect();
if(!ndef.isWritable())
{
Toast.makeText(this, "Tag is not writable!", Toast.LENGTH_SHORT).show();
ndef.close();
return;
}
ndef.writeNdefMessage(ndefMessage);
ndef.close();
Toast.makeText(this, "Tag written", Toast.LENGTH_SHORT).show();
}
}
catch(Exception e)
{
Log.e("writeNdefMessage", e.getMessage());
}
}
private NdefMessage createNdefMessage(String content)
{
NdefRecord ndefRecord = createUrlRecord(content);
NdefMessage ndefMessage=new NdefMessage(new NdefRecord[] {ndefRecord});
return ndefMessage;
}
private NdefRecord createUrlRecord(String content)
{
try {
Uri uri = Uri.parse("http://" + content);
NdefRecord ndefRecord = NdefRecord.createUri(uri);
return ndefRecord;
}
catch(Exception e)
{
Log.e("create Ndef Record", e.getMessage());
return null;
}
}
public void writeUri(View view) {
Toast.makeText(this, "Bring forth thy nfc tag", Toast.LENGTH_SHORT).show();
x=1;
}
}
xml dosyası
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingRight="16dp"
android:paddingTop="16dp"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
tools:context="com.example.jordjr.projectwork.WriteUrl">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button"
android:text="WRITE URL"
android:checked="true"
android:onClick="writeUri"
/>
<EditText
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/txtTagContent"
android:layout_gravity="top"
android:height="40dp"
android:width="320dp"
android:text="Enter Here"
enter code here
/>
</RelativeLayout>
Uygulamanızın kapanmasına neden olan istisnalar nelerdir? –