この件に関して多くの質問があることは承知していますが、この問題に関してstackoverflowとgoogleですべての記事を検索しましたが、まだ問題を解決できません.
なので基本的には留学中に個人プロジェクトでNFC技術を使ったアプリを作ろうと思っています。私の最初のタスクは、NFC タグの読み取りと書き込みを機能させることです。留学は、ここで直接助けを得ることが言語の壁のためにさらに困難になるため、関連性があるだけです.
リンクしようとした最初のアクティビティは、TagsActivity でした。それがうまくいかなかったので、別の簡単なアクティビティを作成してリンクしようと考えました。それが ToTag です。どちらも機能しませんでした。両方とも既にマニフェスト ファイルに含まれています。これにより、多くの同様の問題が修正されたようです。
私はこの同じ問題で何日も立ち往生しており、今日、R.javaの問題を最終的に修正するのに1時間以上かかりましたが、修正後もこの問題はまだ残っています.
なぜそれが機能しないのか本当に困惑しているので、関連するコードのほとんどすべてを投稿するつもりです。
主な活動
package com.example.myapp;
import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
public class TagsActivity extends Activity {
private Button mEnableWriteButton;
private EditText mTextField;
private NfcAdapter mNfcAdapter;
private ProgressBar mProgressBar;
private boolean isWriteReady = false;
private static final String MIME_TYPE = "application/com.myapp.nfc.tag";
public void processWriteIntent(Intent intent){
if(isWriteReady && NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())){
Tag detectedTag = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
String tagWriteMessage = mTextField.getText().toString();
byte[] payload = new String(tagWriteMessage).getBytes();
if(detectedTag != null && NfcUtils.writeTag(
NfcUtils.createMessage(MIME_TYPE, payload), detectedTag)) {
Toast.makeText(this, "Wrote '" + tagWriteMessage + "' to a tag!",
Toast.LENGTH_LONG).show();
setTagWriteReady(false);
}
else{
Toast.makeText(this, "Write failed. Please try again.", Toast.LENGTH_LONG).show();
}
}
}
public void processReadIntent(Intent intent){
List<NdefMessage> intentMessages = NfcUtils.getMessagesFromIntent(intent);
List<String> payloadStrings = new ArrayList<String>(intentMessages.size());
for(NdefMessage message : intentMessages){
for(NdefRecord record : message.getRecords()){
byte[] payload = record.getPayload();
String payloadString = new String(payload);
if(!TextUtils.isEmpty(payloadString)){
payloadStrings.add(payloadString);
}
}
}
if(!payloadStrings.isEmpty()){
Toast.makeText(TagsActivity.this, "Read from tag: " +
TextUtils.join(",", payloadStrings), Toast.LENGTH_LONG);
}
}
/**
* This method enables this activity to write a tag
*
* @param isWriteReady
*
*/
public void setTagWriteReady(boolean isWriteReady){
this.isWriteReady = isWriteReady;
if(isWriteReady){
IntentFilter[] writeTagFilters = new IntentFilter[] {
new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED) };
mNfcAdapter.enableForegroundDispatch(TagsActivity.this, NfcUtils.getPendingIntent(TagsActivity.this),
writeTagFilters, null);
}
else {
//Disable dispatch if not writing tags
mNfcAdapter.disableForegroundDispatch(TagsActivity.this);
}
}
@Override
public void onNewIntent(Intent intent){
//onResume gets called after this to handle the intent
setIntent(intent);
}
@Override
public void onResume(){
super.onResume();
if(isWriteReady && NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())){
processWriteIntent(getIntent());
}
else if(!isWriteReady &&
(NfcAdapter.ACTION_TAG_DISCOVERED.equals(
getIntent().getAction())
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(
getIntent().getAction() ))) {
processReadIntent(getIntent());
}
}
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tags);
/*Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
// Set the text view as the activity layout
setContentView(textView); */
//Make sure we're running on Honeycomb or higher to use ActionBar
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
//Show the Up button in the action bar
getActionBar().setDisplayHomeAsUpEnabled(true);
}
mTextField = (EditText) findViewById(R.id.progress_bar);
mProgressBar = (ProgressBar) findViewById(R.id.edit_message);
mProgressBar.setVisibility(View.GONE);
mEnableWriteButton = (Button) findViewById(R.id.enable_write_button);
mEnableWriteButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
setTagWriteReady(!isWriteReady);
mProgressBar.setVisibility(isWriteReady ? View.VISIBLE : View.GONE);
}
});
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
if(mNfcAdapter == null){
Toast.makeText(this, "Sorry, NFC not available on this device", Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.tags, menu);
return true;
}
}
タグアクティビティ
package com.example.myapp;
import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;
public class TagsActivity extends Activity {
private Button mEnableWriteButton;
private EditText mTextField;
private NfcAdapter mNfcAdapter;
private ProgressBar mProgressBar;
private boolean isWriteReady = false;
private static final String MIME_TYPE = "application/com.myapp.nfc.tag";
public void processWriteIntent(Intent intent){
if(isWriteReady && NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())){
Tag detectedTag = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
String tagWriteMessage = mTextField.getText().toString();
byte[] payload = new String(tagWriteMessage).getBytes();
if(detectedTag != null && NfcUtils.writeTag(
NfcUtils.createMessage(MIME_TYPE, payload), detectedTag)) {
Toast.makeText(this, "Wrote '" + tagWriteMessage + "' to a tag!",
Toast.LENGTH_LONG).show();
setTagWriteReady(false);
}
else{
Toast.makeText(this, "Write failed. Please try again.", Toast.LENGTH_LONG).show();
}
}
}
public void processReadIntent(Intent intent){
List<NdefMessage> intentMessages = NfcUtils.getMessagesFromIntent(intent);
List<String> payloadStrings = new ArrayList<String>(intentMessages.size());
for(NdefMessage message : intentMessages){
for(NdefRecord record : message.getRecords()){
byte[] payload = record.getPayload();
String payloadString = new String(payload);
if(!TextUtils.isEmpty(payloadString)){
payloadStrings.add(payloadString);
}
}
}
if(!payloadStrings.isEmpty()){
Toast.makeText(TagsActivity.this, "Read from tag: " +
TextUtils.join(",", payloadStrings), Toast.LENGTH_LONG);
}
}
/**
* This method enables this activity to write a tag
*
* @param isWriteReady
*
*/
public void setTagWriteReady(boolean isWriteReady){
this.isWriteReady = isWriteReady;
if(isWriteReady){
IntentFilter[] writeTagFilters = new IntentFilter[] {
new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED) };
mNfcAdapter.enableForegroundDispatch(TagsActivity.this, NfcUtils.getPendingIntent(TagsActivity.this),
writeTagFilters, null);
}
else {
//Disable dispatch if not writing tags
mNfcAdapter.disableForegroundDispatch(TagsActivity.this);
}
}
@Override
public void onNewIntent(Intent intent){
//onResume gets called after this to handle the intent
setIntent(intent);
}
@Override
public void onResume(){
super.onResume();
if(isWriteReady && NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())){
processWriteIntent(getIntent());
}
else if(!isWriteReady &&
(NfcAdapter.ACTION_TAG_DISCOVERED.equals(
getIntent().getAction())
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(
getIntent().getAction() ))) {
processReadIntent(getIntent());
}
}
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tags);
/*Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
// Set the text view as the activity layout
setContentView(textView); */
//Make sure we're running on Honeycomb or higher to use ActionBar
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){
//Show the Up button in the action bar
getActionBar().setDisplayHomeAsUpEnabled(true);
}
mTextField = (EditText) findViewById(R.id.progress_bar);
mProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
mProgressBar.setVisibility(View.GONE);
mEnableWriteButton = (Button) findViewById(R.id.enable_write_button);
mEnableWriteButton.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
setTagWriteReady(!isWriteReady);
mProgressBar.setVisibility(isWriteReady ? View.VISIBLE : View.GONE);
}
});
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
if(mNfcAdapter == null){
Toast.makeText(this, "Sorry, NFC not available on this device", Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.tags, menu);
return true;
}
}
タグへ
package com.example.myapp;
import android.app.Activity;
import android.os.Bundle;
public class ToTag extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_to_tag);
// TODO Auto-generated method stub
}
}
MyApp マニフェスト
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.example.myapp"
android:versionCode="1"
android:versionName="1.0" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.myapp.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.myapp.TagsActivity"
android:label="@string/title_activity_tags"
android:launchMode="singleTop"
android:parentActivityName="com.example.myapp.MainActivity" >
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="application/com.example.myapp" />
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.myapp.MainActivity" />
</intent-filter>
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="application/com.example.myapp" />
</intent-filter>
</activity>
<activity
android:name="com.example.myapp.ToTagActivity"
android:label="@string/title_activity_to_tag"
android:parentActivityName="com.example.myapp.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.example.myapp.MainActivity" />
</activity>
</application>
</manifest>
activity_main.xml
<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:gravity="top"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/enable_write_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/edit_message"
android:layout_centerHorizontal="true"
android:text="@string/Write"
android:onClick="writeToTag"/>
<EditText
android:id="@+id/edit_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="19dp"
android:ems="10"
android:hint="" >
<requestFocus />
</EditText>
<Button
android:id="@+id/to_tags"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/enable_write_button"
android:layout_centerHorizontal="true"
android:layout_marginTop="21dp"
android:text="@string/to_tag"
android:onClick="toTag"/>
</RelativeLayout>
activity_tags.xml
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".TagsActivity" >
<Button
android:id="@+id/enable_write_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="81dp"
android:text="@string/TagWriting" />
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/enable_write_button"
android:layout_centerHorizontal="true" />
<EditText
android:id="@+id/edit_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/enable_write_button"
android:layout_centerHorizontal="true"
android:layout_marginBottom="49dp"
android:ems="10"
android:hint="@string/edit_message" >
<requestFocus />
</EditText>
</RelativeLayout>
activity_to_tag.xml
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".ToTagActivity" >
<TextView
android:id="@+id/here"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="80dp"
android:layout_marginTop="51dp"
android:text="@string/Got_Here"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
そして最後にlogcatエラー
04-28 21:32:28.240: D/memalloc(20292): /dev/pmem: Mapped buffer base:0x5178b000 size:2641920 offset:2027520 fd:50
04-28 21:32:28.320: D/memalloc(20292): /dev/pmem: Mapped buffer base:0x51dce000 size:3256320 offset:2641920 fd:53
04-28 21:32:28.770: D/memalloc(20292): /dev/pmem: Mapped buffer base:0x522a8000 size:614400 offset:0 fd:56
04-28 21:32:30.760: W/dalvikvm(20292): threadid=1: thread exiting with uncaught exception (group=0x40db71f8)
04-28 21:32:30.780: E/AndroidRuntime(20292): FATAL EXCEPTION: main
04-28 21:32:30.780: E/AndroidRuntime(20292): java.lang.IllegalStateException: Could not execute method of the activity
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.view.View$1.onClick(View.java:3057)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.view.View.performClick(View.java:3524)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.view.View$PerformClick.run(View.java:14194)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.os.Handler.handleCallback(Handler.java:605)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.os.Handler.dispatchMessage(Handler.java:92)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.os.Looper.loop(Looper.java:137)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.app.ActivityThread.main(ActivityThread.java:4476)
04-28 21:32:30.780: E/AndroidRuntime(20292): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 21:32:30.780: E/AndroidRuntime(20292): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 21:32:30.780: E/AndroidRuntime(20292): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:816)
04-28 21:32:30.780: E/AndroidRuntime(20292): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:583)
04-28 21:32:30.780: E/AndroidRuntime(20292): at dalvik.system.NativeStart.main(Native Method)
04-28 21:32:30.780: E/AndroidRuntime(20292): Caused by: java.lang.reflect.InvocationTargetException
04-28 21:32:30.780: E/AndroidRuntime(20292): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 21:32:30.780: E/AndroidRuntime(20292): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.view.View$1.onClick(View.java:3052)
04-28 21:32:30.780: E/AndroidRuntime(20292): ... 11 more
04-28 21:32:30.780: E/AndroidRuntime(20292): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.myapp/com.example.myapp.ToTag}; have you declared this activity in your AndroidManifest.xml?
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1536)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1390)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.app.Activity.startActivityForResult(Activity.java:3361)
04-28 21:32:30.780: E/AndroidRuntime(20292): at android.app.Activity.startActivity(Activity.java:3468)
04-28 21:32:30.780: E/AndroidRuntime(20292): at com.example.myapp.MainActivity.toTag(MainActivity.java:33)
04-28 21:32:30.780: E/AndroidRuntime(20292): ... 14 more
04-28 21:39:53.060: D/memalloc(20645): /dev/pmem: Mapped buffer base:0x5178b000 size:2641920 offset:2027520 fd:50
04-28 21:39:53.150: D/memalloc(20645): /dev/pmem: Mapped buffer base:0x51b30000 size:3256320 offset:2641920 fd:53
04-28 21:39:53.610: D/memalloc(20645): /dev/pmem: Mapped buffer base:0x5205c000 size:614400 offset:0 fd:56
04-28 21:39:54.170: W/dalvikvm(20645): threadid=1: thread exiting with uncaught exception (group=0x40db71f8)
04-28 21:39:54.180: E/AndroidRuntime(20645): FATAL EXCEPTION: main
04-28 21:39:54.180: E/AndroidRuntime(20645): java.lang.IllegalStateException: Could not execute method of the activity
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.view.View$1.onClick(View.java:3057)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.view.View.performClick(View.java:3524)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.view.View$PerformClick.run(View.java:14194)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.os.Handler.handleCallback(Handler.java:605)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.os.Handler.dispatchMessage(Handler.java:92)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.os.Looper.loop(Looper.java:137)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.app.ActivityThread.main(ActivityThread.java:4476)
04-28 21:39:54.180: E/AndroidRuntime(20645): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 21:39:54.180: E/AndroidRuntime(20645): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 21:39:54.180: E/AndroidRuntime(20645): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:816)
04-28 21:39:54.180: E/AndroidRuntime(20645): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:583)
04-28 21:39:54.180: E/AndroidRuntime(20645): at dalvik.system.NativeStart.main(Native Method)
04-28 21:39:54.180: E/AndroidRuntime(20645): Caused by: java.lang.reflect.InvocationTargetException
04-28 21:39:54.180: E/AndroidRuntime(20645): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 21:39:54.180: E/AndroidRuntime(20645): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.view.View$1.onClick(View.java:3052)
04-28 21:39:54.180: E/AndroidRuntime(20645): ... 11 more
04-28 21:39:54.180: E/AndroidRuntime(20645): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.myapp/com.example.myapp.ToTag}; have you declared this activity in your AndroidManifest.xml?
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1536)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1390)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.app.Activity.startActivityForResult(Activity.java:3361)
04-28 21:39:54.180: E/AndroidRuntime(20645): at android.app.Activity.startActivity(Activity.java:3468)
04-28 21:39:54.180: E/AndroidRuntime(20645): at com.example.myapp.MainActivity.toTag(MainActivity.java:33)
04-28 21:39:54.180: E/AndroidRuntime(20645): ... 14 more
コードの壁で申し訳ありませんが、朝まで何かを忘れると更新できなくなるので、関連するすべてを含めたいと思いました。そして明らかに、これはここでの最初の投稿であり、フォーマットについて調査しようとしましたが、何かを台無しにしたと確信しているので、事前にお詫び申し上げます。
EDIT1: 「ToTag」の代わりに「ToTagActivity」があったマニフェストを修正しました。ここで、TagsActivity への移行で同様のエラーが発生する可能性を特定する必要があります。
EDIT2: プログレスバーを誤って EditText にキャストしようとしたエラーを修正しました。
EDIT3：わかりました！エラーをふるいにかけ、サイトを検索した後、マニフェストで NFC 許可を忘れていることがわかりました。