Failed linking file resources

Question

This is the java file that is giving the error

package com.example.daksh.timetable;  import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView;  public class MainActivity extends AppCompatActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          final Button mon_but,tue_but,wed_but,thur_but,fri_but;         mon_but = (Button)findViewById(R.id.mon);         tue_but = (Button)findViewById(R.id.tue);         wed_but = (Button)findViewById(R.id.wed);         thur_but = (Button)findViewById(R.id.thur);         fri_but = (Button)findViewById(R.id.fri);         final ImageView main_Image = (ImageView) findViewById(R.id.day);         final int[] dayarray = {R.drawable.monday,R.drawable.tuesday,R.drawable.wednesday,R.drawable.thursday, R.drawable.friday};          mon_but.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 main_Image.setImageResource(dayarray[0]);             }          });         tue_but.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 main_Image.setImageResource(dayarray[1]);             }         });         wed_but.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 main_Image.setImageResource(dayarray[2]);             }         });         thur_but.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 main_Image.setImageResource(dayarray[3]);             }         });         fri_but.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 main_Image.setImageResource(dayarray[4]);             }        });    } } 

The errors that I am getting are as follows

Information:Gradle tasks [clean, :app:assembleDebug] C:\Projects\TimeTable\app\src\main\res\layout\activity_main.xml Error:error: resource android:attr/colorSwitchThumbNormal is private. Error:resource android:attr/colorSwitchThumbNormal is private. C:\Projects\TimeTable\app\src\main\res\layout-land\activity_main.xml Error:error: resource android:attr/colorSwitchThumbNormal is private. Error:resource android:attr/colorSwitchThumbNormal is private. Error:failed linking file resources. Error:java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details Error:java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details Error:com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details Error:Execution failed for task ':app:processDebugResources'. Failed to execute aapt Information:BUILD FAILED in 9s Information:9 errors Information:0 warnings Information:See complete output in console

This is the Activity_main.xml file

    <?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/activity_main"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@drawable/background"     android:paddingBottom="16dp"     android:paddingLeft="16dp"     android:paddingRight="16dp"     android:paddingTop="16dp"     tools:context=".MainActivity">      <ImageView         android:id="@+id/day"         android:layout_width="0dp"         android:layout_height="0dp"          android:layout_marginBottom="8dp"         android:layout_marginEnd="8dp"         android:layout_marginStart="8dp"         android:layout_marginTop="16dp"         android:contentDescription="TODO"         app:layout_constraintBottom_toBottomOf="parent"         app:layout_constraintEnd_toStartOf="@+id/guideline_dayselection"         app:layout_constraintHorizontal_bias="0.519"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toTopOf="@+id/guideline2"         app:layout_constraintVertical_bias="0.472"         app:srcCompat="@drawable/monday" />      <TextView         android:id="@+id/textView"         style="@style/Widget.AppCompat.TextView.SpinnerItem"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_marginTop="4dp"         android:fontFamily="serif"         android:text="@string/message"         android:textColor="?android:attr/colorSwitchThumbNormal"         android:textSize="18sp"         app:layout_constraintStart_toStartOf="parent"         app:layout_constraintTop_toTopOf="parent" />      <Button         android:id="@+id/mon"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginBottom="16dp"         android:layout_marginStart="16dp"         android:layout_marginTop="50dp"         android:text="@string/monday"         app:layout_constraintBottom_toTopOf="@+id/tue"         app:layout_constraintStart_toStartOf="@+id/guideline_dayselection"         app:layout_constraintTop_toTopOf="parent" />      <Button         android:id="@+id/tue"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginBottom="16dp"         android:layout_marginStart="16dp"         android:text="@string/tuesday"         app:layout_constraintBottom_toTopOf="@+id/wed"         app:layout_constraintStart_toStartOf="@+id/guideline_dayselection"         app:layout_constraintTop_toBottomOf="@id/mon" />      <Button         android:id="@+id/wed"         android:layout_width="88dp"         android:layout_height="48dp"         android:layout_marginBottom="16dp"         android:layout_marginStart="16dp"         android:text="@string/wednesday"         app:layout_constraintBottom_toTopOf="@+id/thur"         app:layout_constraintStart_toStartOf="@+id/guideline_dayselection"         app:layout_constraintTop_toBottomOf="@id/tue" />      <Button         android:id="@+id/thur"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginBottom="16dp"         android:layout_marginStart="16dp"         android:text="@string/thursday"         app:layout_constraintBottom_toTopOf="@+id/fri"         app:layout_constraintStart_toStartOf="@+id/guideline_dayselection"         app:layout_constraintTop_toBottomOf="@id/wed" />      <Button         android:id="@+id/fri"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginBottom="8dp"         android:layout_marginStart="16dp"         android:text="@string/friday"         app:layout_constraintBottom_toBottomOf="parent"         app:layout_constraintStart_toStartOf="@+id/guideline_dayselection"         app:layout_constraintTop_toBottomOf="@id/thur" />      <android.support.constraint.Guideline         android:id="@+id/guideline_dayselection"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:orientation="vertical"         app:layout_constraintGuide_end="196dp" />      <android.support.constraint.Guideline         android:id="@+id/guideline2"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:orientation="horizontal"         app:layout_constraintGuide_percent="0.15339233" />   </android.support.constraint.ConstraintLayout> 

Answer 1

You maybe having this error on your java files because there is one or more XML file with error.

Go through all your XML files and resolve errors, then clean or rebuild project from build menu

Start with your most recent edited XML file

Answer 2

If anyone reading this has the same problem, this happened to me recently, and it was due to having the xml header written twice by mistake:

<?xml version="1.0" encoding="utf-8"?> <?xml version="1.0" encoding="utf-8"?> <!-- Remove this one --> <shape xmlns:android="http://schemas.android.com/apk/res/android">      <solid android:color="@color/mug_blue"/>      <corners android:radius="@dimen/featured_radius" /> </shape> 

The error I was getting was completely unrelated to this file so it was a tough one to find. Just make sure all your new xml files don't have some kind of mistake like this (as it doesn't show up as an error). EDIT It seems like it shows up as an error now, make sure to check your error logs.