Android - Cannot resolve character "R"

Question

Many stackoverflow answers advise importing R. I did this and I tried rebuilding / clearing my path more than 10 times before asking this question.

Here's how my files are organized:

We can all see that the error lies somewhere between the MainActivity file or the XML file.

Here is the code for the MainActivity file, this is pretty much a copy from the Google git hb server account, and ONLY the error cannot identify what “R” is:

  package com.eatwithme; /* * Copyright (C) 2015 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.content.res.Resources; import android.net.Uri; import android.os.Bundle; import android.text.Html; import android.text.Spanned; import android.view.View; import android.widget.AdapterView; import android.widget.AutoCompleteTextView; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.eatwithme.activities.SampleActivityBase; import com.eatwithme.logger.Log; import com.eatwithme.R; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.api.GoogleApiClient; import com.google.android.gms.common.api.PendingResult; import com.google.android.gms.common.api.ResultCallback; import com.google.android.gms.location.places.Place; import com.google.android.gms.location.places.PlaceBuffer; import com.google.android.gms.location.places.Places; import com.google.android.gms.maps.model.LatLng; import com.google.android.gms.maps.model.LatLngBounds; public class MainActivity extends SampleActivityBase implements GoogleApiClient.OnConnectionFailedListener, GoogleApiClient.ConnectionCallbacks { /** * GoogleApiClient wraps our service connection to Google Play Services and provides access * to the user sign in state as well as the Google APIs. */ protected GoogleApiClient mGoogleApiClient; private PlaceAutocompleteAdapter mAdapter; private AutoCompleteTextView mAutocompleteView; private TextView mPlaceDetailsText; private static final LatLngBounds BOUNDS_GREATER_SYDNEY = new LatLngBounds( new LatLng(-34.041458, 150.790100), new LatLng(-33.682247, 151.383362)); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Set up the Google API Client if it has not been initialised yet. if (mGoogleApiClient == null) { rebuildGoogleApiClient(); } setContentView(R.layout.activity_main); // Retrieve the AutoCompleteTextView that will display Place suggestions. mAutocompleteView = (AutoCompleteTextView) findViewById(R.id.autocomplete_places); // Register a listener that receives callbacks when a suggestion has been selected mAutocompleteView.setOnItemClickListener(mAutocompleteClickListener); // Retrieve the TextView that will display details of the selected place. mPlaceDetailsText = (TextView) findViewById(R.id.place_details); // Set up the adapter that will retrieve suggestions from the Places Geo Data API that cover // the entire world. mAdapter = new PlaceAutocompleteAdapter(this, android.R.layout.simple_list_item_1, BOUNDS_GREATER_SYDNEY, null); mAutocompleteView.setAdapter(mAdapter); // Set up the 'clear text' button that clears the text in the autocomplete view Button clearButton = (Button) findViewById(R.id.button_clear); clearButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mAutocompleteView.setText(""); } }); } /** * Listener that handles selections from suggestions from the AutoCompleteTextView that * displays Place suggestions. * Gets the place id of the selected item and issues a request to the Places Geo Data API * to retrieve more details about the place. * * @see com.google.android.gms.location.places.GeoDataApi#getPlaceById(com.google.android.gms.common.api.GoogleApiClient, * String...) */ private AdapterView.OnItemClickListener mAutocompleteClickListener = new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { /* Retrieve the place ID of the selected item from the Adapter. The adapter stores each Place suggestion in a PlaceAutocomplete object from which we read the place ID. */ final PlaceAutocompleteAdapter.PlaceAutocomplete item = mAdapter.getItem(position); final String placeId = String.valueOf(item.placeId); Log.i(TAG, "Autocomplete item selected: " + item.description); /* Issue a request to the Places Geo Data API to retrieve a Place object with additional details about the place. */ PendingResult<PlaceBuffer> placeResult = Places.GeoDataApi .getPlaceById(mGoogleApiClient, placeId); placeResult.setResultCallback(mUpdatePlaceDetailsCallback); Toast.makeText(getApplicationContext(), "Clicked: " + item.description, Toast.LENGTH_SHORT).show(); Log.i(TAG, "Called getPlaceById to get Place details for " + item.placeId); } }; /** * Callback for results from a Places Geo Data API query that shows the first place result in * the details view on screen. */ private ResultCallback<PlaceBuffer> mUpdatePlaceDetailsCallback = new ResultCallback<PlaceBuffer>() { @Override public void onResult(PlaceBuffer places) { if (!places.getStatus().isSuccess()) { // Request did not complete successfully Log.e(TAG, "Place query did not complete. Error: " + places.getStatus().toString()); return; } // Get the Place object from the buffer. final Place place = places.get(0); // Format details of the place for display and show it in a TextView. mPlaceDetailsText.setText(formatPlaceDetails(getResources(), place.getName(), place.getId(), place.getAddress(), place.getPhoneNumber(), place.getWebsiteUri())); Log.i(TAG, "Place details received: " + place.getName()); } }; private static Spanned formatPlaceDetails(Resources res, CharSequence name, String id, CharSequence address, CharSequence phoneNumber, Uri websiteUri) { Log.e(TAG, res.getString(R.string.place_details, name, id, address, phoneNumber, websiteUri)); return Html.fromHtml(res.getString(R.string.place_details, name, id, address, phoneNumber, websiteUri)); } /** * Construct a GoogleApiClient for the {@link Places#GEO_DATA_API} using AutoManage * functionality. * This automatically sets up the API client to handle Activity lifecycle events. */ protected synchronized void rebuildGoogleApiClient() { // When we build the GoogleApiClient we specify where connected and connection failed // callbacks should be returned, which Google APIs our app uses and which OAuth 2.0 // scopes our app requests. mGoogleApiClient = new GoogleApiClient.Builder(this) .enableAutoManage(this, 0 /* clientId */, this) .addConnectionCallbacks(this) .addApi(Places.GEO_DATA_API) .build(); } /** * Called when the Activity could not connect to Google Play services and the auto manager * could resolve the error automatically. * In this case the API is not available and notify the user. * * @param connectionResult can be inspected to determine the cause of the failure */ @Override public void onConnectionFailed(ConnectionResult connectionResult) { Log.e(TAG, "onConnectionFailed: ConnectionResult.getErrorCode() = " + connectionResult.getErrorCode()); // TODO(Developer): Check error code and notify the user of error state and resolution. Toast.makeText(this, "Could not connect to Google API Client: Error " + connectionResult.getErrorCode(), Toast.LENGTH_SHORT).show(); // Disable API access in the adapter because the client was not initialised correctly. mAdapter.setGoogleApiClient(null); } @Override public void onConnected(Bundle bundle) { // Successfully connected to the API client. Pass it to the adapter to enable API access. mAdapter.setGoogleApiClient(mGoogleApiClient); Log.i(TAG, "GoogleApiClient connected."); } @Override public void onConnectionSuspended(int i) { // Connection to the API client has been suspended. Disable API access in the client. mAdapter.setGoogleApiClient(null); Log.e(TAG, "GoogleApiClient connection suspended."); } } 

Also, here is my Android Manifest file (with remote key). Please pay attention to my activity name. I made it so that if I delete com.eatwithme before the activity name, this will result in an error.

  <?xml version="1.0" encoding="UTF-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.google.playservices.placecomplete" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="19"/> <!-- PlacePicker also requires OpenGL ES version 2 --> <uses-feature android:glEsVersion="0x00020000" android:required="true"/> <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/> <application android:allowBackup="true" android:label="@string/app_name" android:icon="@mipmap/ic_launcher" android:theme="@style/AppTheme"> <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version"/> <meta-data android:name="com.google.android.geo.API_KEY" android:value="AnLE"/> <activity android:name="com.eatwithme.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> </application> 

I personally tried my level better, but, unfortunately, I can’t resolve this conflict. The only three sources of error, in my opinion, can be

1) Does not have an R file

2) AndoridManifest file is not right

3) The main file is wrong 4) The file order is wrong

Any recommendations on this issue?

Answer 1

The problem is your xml manifest:

 <manifest xmlns:android="http://schemas.android.com/apk/res/android" Wrong --> package="com.example.google.playservices.placecomplete" android:versionCode="1" android:versionName="1.0"> 

This should be the exact package name of your project:

 package="com.eatwithme" 

not the name of the Google sample package.

Answer 2

 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.google.playservices.placecomplete" 

Change this package name to the package name of the iecom.eatwithme package.

Answer 3

I have not read all your code - sorry :)

I recommend that you delete your import R. If you are sure that you have all your files in the right places, do as @AbhishekVasisht suggested and “clean up the project” (in Android Studio you click “Build”> “Clear project”, I forgot where it is in Eclipse).

If this does not work, you can also try what is called "invalidate caches and restart". This is a bit extreme because it gets rid of your local history for the project, but it looks like you have reached a point of despair. In Android Studio, you click File> "Invalidate Caches / Restart ..." and you want to select a parameter that cancels and restarts everything in the same action.

As a last resort, you can try to import the existing code as a new Android project. This is a shitty shot, but it worked for me a couple of times in the past.

Good luck Sorry, I know how this can be frustrating.

Answer 4

I do not have enough links to add comments, otherwise it will be a comment.

From my personal experience, try performing a “clean and rebuild”, this once clears this error.

Hope some other people can support me with this

Answer 5

if you are new to udacity android app development and learning lesson 2A / 5th theme and problem occurs when you start compiling the MainActivity.java code, then enter the code below in MainActivity.java the code is below

  package com.example.android.justjava; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.TextView; public class MainActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void submitOrder(View view) { display(1); } private void display(int number) { TextView quantityTextView = (TextView) findViewById( R.id.quanity_text_view); quantityTextView.setText("" + number); } @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); } } 

Answer 6

Make sure all your XML files have valid resources, images, etc. and Clean Project.

I updated my project from GitBucket, and one .png somehow disappeared, so I got this error and that R was missing. I focused on solving R's problem and wasted a couple of hours on it, and when I put a random .png instead of the missing one and cleaned up the project, R came back.

Answer 7

Late answer and another solution. I thought someone needed it.

I used Gradle 3.3.0. This was the main culprit. 6.50 hours from my life wasted. Gradle 3.2.1 fixed the error.

 classpath 'com.android.tools.build:gradle:3.2.1' 

Answer 8

I ran into the same problem. My solution was that the path to the directory in which I saved my project was too long.