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このJavaクラスのアンドロイドランタイム例外が発生しました： 問題の場所がわかりません私はほとんどすべての似たような質問の答えを試みたが、助けていない！また、私はほとんど関係のない関数にコメントをつけてコードを実行しようとしましたが、それもエラーを排除しませんでした。com.google.firebase.database.DatabaseException：java.lang.String型のオブジェクトをクラスオブジェクトに変換できません
public class MainActivity extends AppCompatActivity
implements GoogleApiClient.OnConnectionFailedListener {
private String intentsChild;
private String curFirebaseLocation;
public static final String ANONYMOUS = "anonymous";
private static final String TAG = "MainActivity";
private FirebaseAuth mFirebaseAuth;
private FirebaseUser mFirebaseUser;
private String mUsername;
private String mPhotoUrl;
private GoogleApiClient mGoogleApiClient;
private Button mSendButton;
private RecyclerView mMessageRecyclerView;
private LinearLayoutManager mLinearLayoutManager;
private ProgressBar mProgressBar;
private EditText mMessageEditText;
private DatabaseReference mFirebaseDatabaseReference;
private FirebaseRecyclerAdapter<FriendlyMessage, MessageViewHolder>
mFirebaseAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setStatusBarTranslucent(true);
// Set default username is anonymous.
mUsername = ANONYMOUS;
// Initialize Firebase Auth
mFirebaseAuth = FirebaseAuth.getInstance();
mFirebaseUser = mFirebaseAuth.getCurrentUser();
//initialize facebook app activation
FacebookSdk.sdkInitialize(getApplicationContext());
AppEventsLogger.activateApp(getApplication());
if (mFirebaseUser == null) {
// Not signed in, launch the Sign In activity
startActivity(new Intent(this, SignInActivity.class));
finish();
return;
} else {
mUsername = mFirebaseUser.getDisplayName();
if (mFirebaseUser.getPhotoUrl() != null) {
mPhotoUrl = mFirebaseUser.getPhotoUrl().toString();
}
}
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
.addApi(Auth.GOOGLE_SIGN_IN_API)
.build();
// Initialize ProgressBar and RecyclerView.
mProgressBar = (ProgressBar) findViewById(R.id.progressBar);
mMessageRecyclerView = (RecyclerView) findViewById(R.id.messageRecyclerView);
mLinearLayoutManager = new LinearLayoutManager(this);
mLinearLayoutManager.setStackFromEnd(true);
mMessageRecyclerView.setLayoutManager(mLinearLayoutManager);
mFirebaseDatabaseReference = FirebaseDatabase.getInstance().getReference();
curFirebaseLocation = "users/" + mFirebaseAuth.getCurrentUser().getUid().trim() + "/messages";
intentsChild = "users/" + mFirebaseAuth.getCurrentUser().getUid().trim() + "/intents";
Toast.makeText(this, "users/" + mFirebaseAuth.getCurrentUser().getUid().trim(), Toast.LENGTH_SHORT).show();
// if(mFirebaseDatabaseReference.child(curFirebaseLocation).getParent() == null){
// Toast.makeText(this, curFirebaseLocation + " already exists.", Toast.LENGTH_SHORT).show();
IntentMessage tempintent = new IntentMessage("", "");
FriendlyMessage tempmessage = new FriendlyMessage("Hello, I'm Ed, your personal assistant cum friend",
"Ed", "https://cdn1.iconfinder.com/data/icons/user-pictures/100/male3-512.png", "1476880306");
mFirebaseDatabaseReference.child(curFirebaseLocation).setValue(tempmessage);
mFirebaseDatabaseReference.child(intentsChild).setValue(tempintent);
// }
Toast.makeText(this, curFirebaseLocation, Toast.LENGTH_SHORT).show();
// New child entries
mFirebaseAdapter = new FirebaseRecyclerAdapter<FriendlyMessage,
MessageViewHolder>(
FriendlyMessage.class,
R.layout.item_message,
MessageViewHolder.class,
mFirebaseDatabaseReference.child(curFirebaseLocation)) {
@Override
protected void populateViewHolder(MessageViewHolder viewHolder,
FriendlyMessage friendlyMessage, int position) {
mProgressBar.setVisibility(ProgressBar.INVISIBLE);
viewHolder.messageTextView.setText(friendlyMessage.getText());
viewHolder.messengerTextView.setText(friendlyMessage.getName());
if (friendlyMessage.getPhotoUrl() == null) {
viewHolder.messengerImageView
.setImageDrawable(ContextCompat
.getDrawable(MainActivity.this,
tod));
} else {
Glide.with(MainActivity.this)
.load(friendlyMessage.getPhotoUrl())
.into(viewHolder.messengerImageView);
}
if (friendlyMessage.getName().equals("Ed")){
//TODO : Do this as it is necessary
// viewHolder.diffForRecSend.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.white));
// viewHolder.diffForRecSend.setBackgroundResource(R.drawable.abcd123);
}
else {
//TODO : Do this as it is necessary
// viewHolder.diffForRecSend.setBackgroundColor(ContextCompat.getColor(MainActivity.this, R.color.colorAccent));
// viewHolder.diffForRecSend.setBackgroundResource(R.drawable.abcd1234);
}
}
};
mFirebaseDatabaseReference.child(intentsChild).addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) {
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
IntentMessage newIntentMessage = dataSnapshot.getValue(IntentMessage.class);
String name = newIntentMessage.getIntentName();
String fields = newIntentMessage.getIntentFields();
if (name.equals("") || fields.equals(""))
return;
IntentMessage temp = new IntentMessage("", "");
mFirebaseDatabaseReference.child(intentsChild).child("-KUWmGwxVe0HCYtYWfdI").setValue(temp);
// IntentFiringActivity newIntentFiringActivity;
Log.d(TAG, "onChildUpdated: " + name + fields);
System.out.println("onChildUpdated: " + name + fields);
if (name.equals("gmail"))
fireGmailIntent(fields.split("\\$"));
else if (name.equals("alarm1"))
fireAlarmIntent(fields.split("\\$"));
else if (name.equals("alarm2"))
fireAlarmIntent2(fields.split("\\$"));
// newIntentFiringActivity = new IntentFiringActivity(name, fields);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
IntentMessage newIntentMessage = dataSnapshot.getValue(IntentMessage.class);
Log.d(TAG, "onChildRemoved: " + newIntentMessage.getIntentName() + newIntentMessage.getIntentFields());
System.out.println("onChildRemoved: " + newIntentMessage.getIntentName() + newIntentMessage.getIntentFields());
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
mFirebaseAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
super.onItemRangeInserted(positionStart, itemCount);
int friendlyMessageCount = mFirebaseAdapter.getItemCount();
int lastVisiblePosition =
mLinearLayoutManager.findLastCompletelyVisibleItemPosition();
// If the recycler view is initially being loaded or the
// user is at the bottom of the list, scroll to the bottom
// of the list to show the newly added message.
if (lastVisiblePosition == -1 ||
(positionStart >= (friendlyMessageCount - 1) &&
lastVisiblePosition == (positionStart - 1))) {
mMessageRecyclerView.scrollToPosition(positionStart);
}
}
});
mMessageRecyclerView.setLayoutManager(mLinearLayoutManager);
mMessageRecyclerView.setAdapter(mFirebaseAdapter);
mMessageEditText = (EditText) findViewById(R.id.messageEditText);
mMessageEditText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
if (charSequence.toString().trim().length() > 0) {
mSendButton.setEnabled(true);
} else {
mSendButton.setEnabled(false);
}
}
@Override
public void afterTextChanged(Editable editable) {
}
});
mSendButton = (Button) findViewById(R.id.sendButton);
mSendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Long tsLong = (System.currentTimeMillis()/1000);
String ts = tsLong.toString();
FriendlyMessage friendlyMessage = new
FriendlyMessage(mMessageEditText.getText().toString(),
mUsername,
mPhotoUrl,
ts);
mFirebaseDatabaseReference.child(curFirebaseLocation)
.push().setValue(friendlyMessage);
mMessageEditText.setText("");
}
});
}
private void fireAlarmIntent(String[] intentFields) {
int hours = Integer.parseInt(intentFields[0].trim());
int minutes;
if(intentFields[1].trim().equals("")){
minutes = 0;
}
else {
minutes = Integer.parseInt(intentFields[1].trim());
}
Intent i = new Intent(AlarmClock.ACTION_SET_ALARM);
i.putExtra(AlarmClock.EXTRA_SKIP_UI, true);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra(AlarmClock.EXTRA_HOUR, hours);
i.putExtra(AlarmClock.EXTRA_MINUTES, minutes);
int temp1 = 1;
startActivityForResult(i, temp1);
String temp = "Alarm set for " + hours + " : " + minutes;
Log.d(TAG, temp);
// Toast.makeText(this, temp, Toast.LENGTH_SHORT).show();
}
private void fireAlarmIntent2(String[] intentFields) {
int hours = Integer.parseInt(intentFields[0].trim());
int curhours = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
int finalhours = (hours + curhours) % 24;
int curmin = Calendar.getInstance().get(Calendar.MINUTE);
Intent i = new Intent(AlarmClock.ACTION_SET_ALARM);
i.putExtra(AlarmClock.EXTRA_SKIP_UI, true);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra(AlarmClock.EXTRA_HOUR, finalhours);
i.putExtra(AlarmClock.EXTRA_MINUTES, curmin);
int temp1 = 1;
startActivityForResult(i, temp1);
String temp = "Alarm set for " + finalhours + " : " + curmin;
Log.d(TAG, temp);
Log.d(TAG, "currentHours: " + curhours + " and received from server : " + hours + " hence total is : " + finalhours);
// Toast.makeText(this, temp, Toast.LENGTH_SHORT).show();
}
private void fireGmailIntent(String[] intentFields) {
String[] email = new String[1];
email[0] = intentFields[0];
Log.d(TAG, "My unique log " + email[0]);
String subject = intentFields[1];
String body = intentFields[2];
Intent intent = new Intent(Intent.ACTION_SENDTO);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setType("message/rfc822");
intent.setData(Uri.parse("mailto:"));
intent.putExtra(Intent.EXTRA_EMAIL, email);
intent.putExtra(Intent.EXTRA_SUBJECT, subject);
intent.putExtra(Intent.EXTRA_TEXT, body);
Log.d(TAG, "My unique log " + email[0] + "__" + subject + "__" + body);
if (intent.resolveActivity(getPackageManager()) != null) {
int temp = 4;
startActivityForResult(intent, temp);
Log.d(TAG, "My unique log " + email[0] + "__" + subject + "__" + body + "again");
}
}
protected void setStatusBarTranslucent(boolean makeTranslucent) {
if (makeTranslucent) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
} else {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
}
// Firebase instance variables
@Override
public void onStart() {
super.onStart();
// Check if user is signed in.
// TODO: Add code to check if user is signed in.
}
@Override
public void onPause() {
super.onPause();
}
@Override
public void onResume() {
super.onResume();
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_menu, menu);
return true;
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
startActivity(new Intent(this, SignInActivity.class));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.sign_out_menu:
mFirebaseAuth.signOut();
LoginManager.getInstance().logOut();
FirebaseAuth.getInstance().signOut();
Auth.GoogleSignInApi.signOut(mGoogleApiClient);
mUsername = ANONYMOUS;
startActivity(new Intent(this, SignInActivity.class));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
// An unresolvable error has occurred and Google APIs (including Sign-In) will not
// be available.
Log.d(TAG, "onConnectionFailed:" + connectionResult);
Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show();
}
public static class MessageViewHolder extends RecyclerView.ViewHolder {
public TextView messageTextView;
public TextView messengerTextView;
public CircleImageView messengerImageView;
public LinearLayout diffForRecSend;
public MessageViewHolder(View v) {
super(v);
messageTextView = (TextView) itemView.findViewById(R.id.messageTextView);
messengerTextView = (TextView) itemView.findViewById(R.id.messengerTextView);
messengerImageView = (CircleImageView) itemView.findViewById(R.id.messengerImageView);
diffForRecSend = (LinearLayout) itemView.findViewById(R.id.message_main_id);
}
}
}
これはlogcatエラーです：
Process: com.google.firebase.codelab.friendlychat, PID: 20107
com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type com.google.firebase.codelab.friendlychat.FriendlyMessage
at com.google.android.gms.internal.zzaln.zzd(Unknown Source)
at com.google.android.gms.internal.zzaln.zzb(Unknown Source)
at com.google.android.gms.internal.zzaln.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.firebase.ui.database.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:147)
at com.firebase.ui.database.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:136)
at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:176)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5453)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5486)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4723)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4599)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1988)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1384)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1347)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:549)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3003)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2881)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3265)
at android.view.View.layout(View.java:16969)
at android.view.ViewGroup.layout(ViewGroup.java:5583)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1189)
at android.view.View.layout(View.java:16969)
at android.view.ViewGroup.layout(ViewGroup.java:5583)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:396)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:16969)
at android.view.ViewGroup.layout(ViewGroup.java:5583)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437)
at android.view.View.layout(View.java:16969)
at android.view.ViewGroup.layout(ViewGroup.java:5583)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:396)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at android.view.View.layout(View.java:16969)
at android.view.ViewGroup.layout(ViewGroup.java:5583)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:2001)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1844)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1753)
at android.view.View.layout(View.java:16969)
at android.view.ViewGroup.layout(ViewGroup.java:5583)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:396)
at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2728)
at android.view.View.layout(View.java:16969)
at android.view.ViewGroup.layout(ViewGroup.java:5583)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2552)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2255)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1321)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6708)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:894)
at android.view.Choreographer.doCallbacks(Choreographer.java:696)
at android.view.Choreographer.doFrame(Choreographer.java:631)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:880)
at android.os.Handler.handleCallback(Handler.java:822)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Loop
以下は、参考のための私のJSON構造の単なるスナップショットです：デバッグ後
{
"users" : {
"ERyWg81WxrXUb0sjsu9hv9T7K0E3" : {
"intents" : {
"intentName" : "",
"intentValue" : ""
},
"messages" : {
"-KViVgc7ZG051eMXP0-5" : {
"name" : "Ed",
"text" : "Hello, I'm Ed, your personal assistant cum friend",
"timestamp" : "1476880306"
}
}
},
"Y9UNlizDSobddO8cdq7K4ChipYa2" : {
"intents" : {
"intentName" : "",
"intentValue" : ""
},
"messages" : {
"-KViVgc7ZG051eMXP0-5" : {
"name" : "Ed",
"text" : "Hello, I'm Ed, your personal assistant cum friend",
"timestamp" : "1476880306"
}
}
}
}
}
はEDIT OK、I問題が次の行にあることを発見しました。 これで問題は絞り込まれました。私は、エラーの残りの部分を見つけるのに役立つしてください：
mFirebaseAdapter = new FirebaseRecyclerAdapter<FriendlyMessage,
MessageViewHolder>(
FriendlyMessage.class,
R.layout.item_message,
MessageViewHolder.class,
mFirebaseDatabaseReference.child(curFirebaseLocation)) {
@Override
protected void populateViewHolder(MessageViewHolder viewHolder,
FriendlyMessage friendlyMessage, int position) {
//...//
}
EDIT 2： 私は重要な側面を指摘：データ接続なしでアプリケーションを実行している間、アプリはまだ、残念ながら「エラーを示しました。エドが停止した "私のアプリが働いていたとき（私のアプリが今日よりも一段落していたとき）、これは当初、firebaseデータベースからデータをロードしてエラーを表示したときと同じように自然ではありません。しかし今回は、データベースからデータをロードする前にエラーが表示されます。これは、エラーがアプリケーションの一部にあるという結論につながります。データがロードされるまでオフライン状態でエラーが表示されているため、進行状況ダイアログを継続的に表示していたはずです。
私はなぜ私はエラーを取得していた3 EDIT： この行： mFirebaseAdapter =新しいFirebaseRecyclerAdapter（ FriendlyMessage.class、 R.layout.item_message、 MessageViewHolder.class、 mFirebaseDatabaseReference.child（curFirebaseLocation） ）{... この行で、curFirebaseLocationの代わりに他の文字列を渡すと、エラーは発生せず、アプリケーションには問題なくロードされますが、curFirebaseLocation変数を渡すと、上のLogCatに表示されるエラーが発生します。さて、私はエラーunable to convert java.lang.String to ...FriendlyMessageを得て、なぜなら、curFirebaseLocationの値と私が渡す文字列（どちらもエラーが出ない）が同じであっても、私はただ知っている必要があります。私はそれがFirebaseRecyclerAdapterとやりがいがあると思います。助けてください！！
注：curFirebaseLocationとintentsMessage文字列の出力が記録され、完全に正常であることがわかりました。私はそれらをコピーしてブラウザに貼り付けると、まさに私が期待していた場所に導かれました。 さらに詳しい説明が必要かどうかをご記入ください。 ありがとうございます！
彼らは 'IntentMessage'クラスの空のコンストラクタです。また、エラーはFriendlyessageクラスに関連しています。 –
あなたの 'dataSnapshot'を見てください。私は完全なデータのスナップショットを含んでいると思います。これが真であれば、あなたは 'FriendlyMessage'にキャストできない完全なデータを返します。 –
あなたが話している 'dataSnapshot'は' IntentsMessage'クラスに関連していますが、この部分は完全に二次的に使用されています。この関数全体をコメントしてコードを実行すると、同じエラーが発生します。また、私が上記のEDITで言及した部分を除いてコードのほとんどの部分にコメントしたとき、エラーは起こらなかったので、エラーは上記の数行だけにあると考えられます。 –