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POR.layout.main cannot be resolved to a variable
 

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  1. POR.layout.main cannot be resolved to a variable
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    <p>I've found this code from Raghav Sood's Pro Android Augmented Reality book. I've tried to execute the code as it is written in the book but yet i am facing so much of difficulties.i've tried cleaning and building of project. Put the checkbox tick in the project's property dialogue box. Checked import Android.R presence in my code. Even i uninstalled my AndroidSDK and reinstalled it with different set of Android versions and APIs. Uninstalled and reinstalled Eclipse.</p> <p>Here is my ProAndroidAR3Activity.java file</p> <pre><code> package com.paar.ch3widgetoverlay; import android.app.Activity; import android.hardware.Camera; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.widget.TextView; public class ProAndroidAR3Activity extends Activity{ SurfaceView cameraPreview; SurfaceHolder previewHolder; Camera camera; boolean inPreview; final static String TAG = "PAAR"; SensorManager sensorManager; int orientationSensor; float headingAngle; float pitchAngle; float rollAngle; int accelerometerSensor; float xAxis; float yAxis; float zAxis; LocationManager locationManager; double latitude; double longitude; double altitude; TextView xAxisValue; TextView yAxisValue; TextView zAxisValue; TextView headingValue; TextView pitchValue; TextView rollValue; TextView altitudeValue; TextView latitudeValue; TextView longitudeValue; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //here is the problem. every part of the code with R. is having problem locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 2, locationListener); sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); orientationSensor = Sensor.TYPE_ORIENTATION; accelerometerSensor = Sensor.TYPE_ACCELEROMETER; sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(orientationSensor), SensorManager.SENSOR_DELAY_NORMAL); sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(accelerometerSensor), SensorManager.SENSOR_DELAY_NORMAL); inPreview = false; cameraPreview = (SurfaceView)findViewById(R.id.cameraPreview); previewHolder = cameraPreview.getHolder(); previewHolder.addCallback(surfaceCallback); previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); xAxisValue = (TextView) findViewById(R.id.xAxisValue); yAxisValue = (TextView) findViewById(R.id.yAxisValue); zAxisValue = (TextView) findViewById(R.id.zAxisValue); headingValue = (TextView) findViewById(R.id.headingValue); pitchValue = (TextView) findViewById(R.id.pitchValue); rollValue = (TextView) findViewById(R.id.rollValue); altitudeValue = (TextView) findViewById(R.id.altitudeValue); longitudeValue = (TextView) findViewById(R.id.longitudeValue); latitudeValue = (TextView) findViewById(R.id.latitudeValue); </code></pre> <p>This is the AndroidManifest.xml file of my project:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.paar.ch3widgetoverlay" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="7" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" &gt; &lt;activity android:label="@string/app_name" android:name=".ProAndroidAR3Activity" android:screenOrientation = "landscape" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" android:configChanges = "keyboardHidden|orientation"&gt; &lt;intent-filter &gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;uses-feature android:name="android.hardware.camera" /&gt; &lt;uses-permission android:name="android.permission.CAMERA" /&gt; &lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /&gt; &lt;/manifest&gt; </code></pre> <p>The following is the res/layout/main.xml file</p> <pre><code> &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/relativeLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;SurfaceView android:id="@+id/cameraPreview" android:layout_width="fill_parent" android:layout_height="fill_parent" /&gt; &lt;TextView android:id="@+id/xAxisLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="18dp" android:layout_marginTop="15dp" android:text="@string/xAxis" /&gt; &lt;TextView android:id="@+id/yAxisLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/xAxisLabel" android:layout_below="@+id/xAxisLabel" android:text="@string/yAxis" /&gt; &lt;TextView android:id="@+id/zAxisLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/yAxisLabel" android:layout_below="@+id/yAxisLabel" android:text="@string/zAxis" /&gt; &lt;TextView android:id="@+id/headingLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/zAxisLabel" android:layout_below="@+id/zAxisLabel" android:layout_marginTop="19dp" android:text="@string/heading" /&gt; &lt;TextView android:id="@+id/pitchLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/headingLabel" android:layout_below="@+id/headingLabel" android:text="@string/pitch" /&gt; &lt;TextView android:id="@+id/rollLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/pitchLabel" android:layout_below="@+id/pitchLabel" android:text="@string/roll" /&gt; &lt;TextView android:id="@+id/latitudeLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/rollLabel" android:layout_below="@+id/rollLabel" android:layout_marginTop="34dp" android:text="@string/latitude" /&gt; &lt;TextView android:id="@+id/longitudeLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/latitudeLabel" android:layout_below="@+id/latitudeLabel" android:text="@string/longitude" /&gt; &lt;TextView android:id="@+id/altitudeLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/longitudeLabel" android:layout_below="@+id/longitudeLabel" android:text="@string/altitude" /&gt; &lt;TextView android:id="@+id/xAxisValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/xAxisLabel" android:layout_marginLeft="56dp" android:layout_toRightOf="@+id/longitudeLabel" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/yAxisValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/yAxisLabel" android:layout_alignBottom="@+id/yAxisLabel" android:layout_alignLeft="@+id/xAxisValue" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/zAxisValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/headingLabel" android:layout_alignLeft="@+id/yAxisValue" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/headingValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/headingLabel" android:layout_alignBottom="@+id/headingLabel" android:layout_alignLeft="@+id/zAxisValue" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/pitchValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/pitchLabel" android:layout_alignBottom="@+id/pitchLabel" android:layout_alignLeft="@+id/headingValue" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/rollValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/latitudeLabel" android:layout_alignLeft="@+id/pitchValue" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/latitudeValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/latitudeLabel" android:layout_alignLeft="@+id/rollValue" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/longitudeValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/longitudeLabel" android:layout_alignBottom="@+id/longitudeLabel" android:layout_alignLeft="@+id/latitudeValue" android:text="@string/empty" /&gt; &lt;TextView android:id="@+id/altitudeValue" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/altitudeLabel" android:layout_alignBottom="@+id/altitudeLabel" android:layout_alignLeft="@+id/longitudeValue" android:text="@string/empty" /&gt; &lt;/RelativeLayout&gt;` </code></pre> <p>The following is the res/values/strings.xml file</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;string name="hello"&gt;Hello World, ProAndroidAR3Activity!&lt;/string&gt; &lt;string name="app_name"&gt;Pro Android AR 3 Widget Overlay&lt;/string&gt; &lt;string name="xAxis"&gt;X Axis:&lt;/string&gt; &lt;string name="yAxis"&gt;Y Axis:&lt;/string&gt; &lt;string name="zAxis"&gt;Z Axis:&lt;/string&gt; &lt;string name="heading"&gt;Heading:&lt;/string&gt; &lt;string name="pitch"&gt;Pitch:&lt;/string&gt; &lt;string name="roll"&gt;Roll:&lt;/string&gt; &lt;string name="altitude"&gt;Altitude:&lt;/string&gt; &lt;string name="longitude"&gt;Longitude:&lt;/string&gt; &lt;string name="latitude"&gt;Latitude:&lt;/string&gt; &lt;string name="empty"&gt;&lt;/string&gt; &lt;/resources&gt; </code></pre> <p>I have set the minsdk version to be 2.1 that is API 7 and the compile SDK version is 4.1 that is API 16...</p> <p>please help me out...</p>
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    1. USVaibhav Srivastava
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      1. VTUpMod
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    1. COAn error in an XML file can prevent the R file from being built. If you are using Eclipse, open the Package Explorer window and look for any files in your `res/` folder with a red `x`.
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      1. USSam
    2. CO</RelativeLayout>` there's an extra character after closing tag. Are you seeing an error on xml editor after saving main.xml on Eclipse?
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      1. USharism
    3. COMy guess is that as that code is in a book it's probably outdated, maybe you need another sdk.
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      1. USfonZ
 

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