Spen sample applicatoin crashes just after it launches(Runtime error)

Question

I am making a sample Spen SDK app for my Samsung Note 3.0 and am using Android Studio. The relavant xml file is:-

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:id="@+id/settingBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="pen"
            android:layout_weight="1"/>
        <Button
            android:id="@+id/eraseBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="erase"
            android:layout_weight="1"/>
        <Button
            android:id="@+id/undoBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="undo"
            android:layout_weight="1"/>
        <Button
            android:id="@+id/redoBtn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="redo"
            android:layout_weight="1"/>
    </LinearLayout>

    <FrameLayout
        android:id="@+id/canvas_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <com.samsung.sdraw.CanvasView
            android:id="@+id/canvas_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/ic_launcher"
            />
        <com.samsung.sdraw.SettingView
            android:id="@+id/setting_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </FrameLayout>

And the corresponding java code is:-

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

        MainActivity mContext = this;

        CanvasView mCanvasView = (CanvasView) findViewById(R.id.canvas_view);
        RelativeLayout mCanvasContainer = (RelativeLayout) findViewById(R.id.canvas_container);
        SCanvasView mSCanvas = new SCanvasView(mContext);
        mCanvasContainer.addView(mSCanvas);
    }

Now when I try to debug the app by connecting Samsung Note 3.0 to PC, the app launches, shows the mainPage and crashes within a second. I searched on the net and found this and this. I too didn't have armeabi directory of Spen SDK in the libs folder. So, I included the libraries and now my project's libs folder looks like:-

libs <-- my Project's folder
  libs
    armeabi
    libspen23.jar
    libspen23_multiwindow.jar

But still the same thing is happening. There is no compile error. One thing that I then noticed was that my xml file could not be rendered by the Android Studio. Following is the screenshot:

The exeptions are:- The following classes could not be instantiated:

• com.samsung.sdraw.CanvasView (Write access not allowed during rendering(\mnt\sdcard\android\data\null\serial) )
• com.samsung.sdraw.SettingView(java.lang.NullPointerException )

Can anyone tell me what thw problem is?

UPDATE:

1. I have debugged the app and exception occurs at

   setContentView(R.layout.activity_main);

in OnCreate(). But I can't find out why is the app crashing there.

2. The gradle file is:-

apply plugin: 'android'  

android {  
    compileSdkVersion 19  
    buildToolsVersion '19.1.0'  
    defaultConfig {  
        applicationId 'com.example.myapplication3.app'  
        minSdkVersion 9  
        targetSdkVersion 19  
        versionCode 1  
        versionName '1.0'  
    }  
    buildTypes {  
        release {  
            runProguard false  
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'  
        }  
    }  
    productFlavors {  
    }  
}  

 dependencies {  
    compile fileTree(dir: 'libs', include: ['*.jar'])  
    compile files('libs/libspen23.jar')  
    compile 'com.android.support:appcompat-v7:19.+'  
    compile files('libs/libs/libspen23.jar')  
}

3. The app runs if I comment the CanvasView and SettingsView blocks from xml file and the corresponding lines from OnCreate() function.

Answer 1

When you are using layount-weight you should set either layout-width or layout-height to 0dip. Try setting android:layout_width="0dip" in each button. Maybe that will do it. If not try commenting this:

<com.samsung.sdraw.CanvasView
            android:id="@+id/canvas_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/ic_launcher"
            />
        <com.samsung.sdraw.SettingView
            android:id="@+id/setting_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

If it helps we will know where the problem is.

Also please paste your build.gradle