an error in android studio:Execution failed for task ':app:mergeDebugResources'.

[moh bs]

hi everybody i want to make an android app for controling bluetooth module hc-05,i have the following code in android studio:
MainActivity.java

package com.example.shsmszdh.blue1;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import android.graphics.Color;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

public class MainActivity extends Activity  {
    Button b1,b2,b3,b4;
    private BluetoothAdapter BA;
    private Set<BluetoothDevice>pairedDevices;
    ListView lv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        b1 = (Button) findViewById(R.id.button);
        b2=(Button)findViewById(R.id.button2);
        b3=(Button)findViewById(R.id.button3);
        b4=(Button)findViewById(R.id.button4);

        BA = BluetoothAdapter.getDefaultAdapter();
        lv = (ListView)findViewById(R.id.listView);
    }

    public void on(View v){
        if (!BA.isEnabled()) {
            Intent turnOn = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(turnOn, 0);
            Toast.makeText(getApplicationContext(),"Turned on",Toast.LENGTH_LONG).show();
        }
        else
        {
            Toast.makeText(getApplicationContext(),"Already on", Toast.LENGTH_LONG).show();
        }
    }

    public void off(View v){
        BA.disable();
        Toast.makeText(getApplicationContext(),"Turned off" ,Toast.LENGTH_LONG).show();
    }

    public  void visible(View v){
        Intent getVisible = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        startActivityForResult(getVisible, 0);
    }

    public void list(View v){
        pairedDevices = BA.getBondedDevices();
        ArrayList list = new ArrayList();

        for(BluetoothDevice bt : pairedDevices)
            list.add(bt.getName());
        Toast.makeText(getApplicationContext(),"Showing Paired Devices",Toast.LENGTH_SHORT).show();

        final ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1, list);
        lv.setAdapter(adapter);
    }

    @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);
    }
}

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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:transitionGroup="true">

    <TextView
        android:text="bluetooth_example" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textview"
        android:textSize="35sp"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Turn On"
        android:id="@+id/button"
        android:clickable="true"
        android:onClick="on"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/textview" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Get visible"
        android:onClick="visible"
        android:id="@+id/button2"
        android:layout_above="@+id/textView2"
        android:layout_alignStart="@+id/button3" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="List devices"
        android:onClick="list"
        android:id="@+id/button3"
        android:layout_above="@+id/listView"
        android:layout_alignEnd="@+id/listView" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="turn off"
        android:onClick="off"
        android:id="@+id/button4"
        android:layout_alignTop="@+id/button"
        android:layout_centerHorizontal="true" />

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:layout_below="@+id/textView2"
        android:layout_alignParentStart="true"
        android:layout_marginTop="45dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Paired devices:"
        android:id="@+id/textView2"
        android:textColor="#ff34ff06"
        android:textSize="25dp"
        android:layout_below="@+id/button"
        android:layout_alignParentStart="true"
        android:layout_marginTop="37dp" />

</RelativeLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.shsmszdh.blue1">

    <uses-permission android:name="android.permission.BLUETOOTH"/>
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".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>
</manifest>

and when i select run i see this error:

Error:Execution failed for task ':app:mergeDebugResources'.
> [drawable/abc] E:\DriveC\summer95\project\AndroidStudio_Project\Blue1\app\src\main\res\drawable\abc.png	[drawable/abc] E:\DriveC\summer95\project\AndroidStudio_Project\Blue1\app\src\main\res\values\refs.xml: Error: Duplicate resources

it seems that coulde not make r.java file because R symbol in MainActivity.java file is red and says:cannot resolvs symbol R
please say me exactly what should i do,i am new in android programming ,i need your help!!!!!!!!!!!!!!!

 

[Laura Knotek]

Hi and welcome to Android Central.

I've moved your thread to the Software Development and Hacking forum, since that is something other developers would be able to help you with, but ordinary users would not.