Question

I’ve been playing around with code I found at Android Development – Playing with graphics in Android.

Unfortunately, I haven’t been so lucky with my implementaion of the code lol I believe, based upon LogCat, that Android is unable to find a method which does exist.

Below are the logcat details:

Logcat

 02-08 12:43:07.725: E/AndroidRuntime(9284): FATAL EXCEPTION: main
    02-08 12:43:07.725: E/AndroidRuntime(9284): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.odhranlynch.interiordesigner/com.odhranlynch.interiordesigner.NewProduct}: android.view.InflateException: Binary XML file line #6: Error inflating class com.odhranlynch.interiordesigner.NewProduct$designCanvas
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.os.Handler.dispatchMessage(Handler.java:99)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.os.Looper.loop(Looper.java:123)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.ActivityThread.main(ActivityThread.java:3691)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at java.lang.reflect.Method.invokeNative(Native Method)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at java.lang.reflect.Method.invoke(Method.java:507)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at dalvik.system.NativeStart.main(Native Method)
    02-08 12:43:07.725: E/AndroidRuntime(9284): Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class com.odhranlynch.interiordesigner.NewProduct$designCanvas
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.view.LayoutInflater.createView(LayoutInflater.java:508)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:570)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.Activity.setContentView(Activity.java:1663)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at com.odhranlynch.interiordesigner.NewProduct.onCreate(NewProduct.java:28)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
    02-08 12:43:07.725: E/AndroidRuntime(9284):     ... 11 more
    02-08 12:43:07.725: E/AndroidRuntime(9284): Caused by: java.lang.NoSuchMethodException: designCanvas(Context,AttributeSet)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at java.lang.Class.getMatchingConstructor(Class.java:643)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at java.lang.Class.getConstructor(Class.java:472)
    02-08 12:43:07.725: E/AndroidRuntime(9284): at android.view.LayoutInflater.createView(LayoutInflater.java:480)
02-08 12:43:07.725: E/AndroidRuntime(9284):     ... 21 more

NewProduct.java

public class NewProduct extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.new_product);
}

class designCanvas extends SurfaceView implements SurfaceHolder.Callback {
    private drawThread _thread;
    private ArrayList<GraphicObject> _graphics = new ArrayList<GraphicObject>();

    public designCanvas(Context context, AttributeSet attrs) {
        super(context, attrs);
        getHolder().addCallback(this);
        _thread = new drawThread(getHolder(), this); 
        setFocusable(true);
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        synchronized (_thread.getSurfaceHolder()) {
            if (event.getAction() == MotionEvent.ACTION_UP) {
                GraphicObject graphic = new GraphicObject(BitmapFactory.decodeResource(getResources(), R.drawable.circle_point));
                graphic.getCoordinates().setX((int) event.getX() - graphic.getGraphic().getWidth() / 2);
                graphic.getCoordinates().setY((int) event.getY() - graphic.getGraphic().getHeight() / 2);
                _graphics.add(graphic);
            }
            return true;
        }
    }
    
    @Override 
    public void onDraw(Canvas canvas) {
        //Set canvas background size and colour
        Path mPath = new Path();
        Paint paint = new Paint(); 
        canvas.drawColor(Color.DKGRAY);
        Bitmap b = Bitmap.createBitmap(200, 200,
        Bitmap.Config.ARGB_8888);
        

        paint.setFilterBitmap(true);
        Bitmap productImage = BitmapFactory.decodeResource(getResources(),R.drawable.glass_lamp);
        canvas.drawBitmap(productImage, 0, 0, paint);

        Canvas c = new Canvas(b);
        paint.setAlpha(255); //0x80
        c.translate(0, 30);
        //c.drawBitmap(productImage, new Matrix(), paint);
        paint.setColor(Color.BLUE);
        
        Bitmap bitmap;
        GraphicObject.Coordinates coords;
        for (GraphicObject graphic : _graphics) {
            //Create a graphical point indicating where the user has touched on screen.
            bitmap = graphic.getGraphic();
            coords = graphic.getCoordinates();
            canvas.drawBitmap(bitmap, coords.getX(), coords.getY(), null);
            //Create path coords points are being placed on canvas.
            Log.d("Point Cords", String.valueOf(coords.getX() + " " + coords.getY()));
            
            if (_graphics.isEmpty()) {
                //_graphics array has no entries, so this is the first coord.
                mPath.moveTo(coords.getX(), coords.getY());
            } else {
                //Record subsequent coords.
                mPath.lineTo(coords.getX(), coords.getY());
            }
        }
    }
    
    //@Override
     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        //TODO something
    }
    
    //@Override
    public void surfaceCreated(SurfaceHolder holder) {
        _thread.setRunning(true);
        _thread.start();
    }
 
    //@Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // simply copied from sample application LunarLander:
        // we have to tell thread to shut down & wait for it to finish, or else
        // it might touch the Surface after we return and explode
        boolean retry = true;
        _thread.setRunning(false);
        while (retry) {
            try {
                _thread.join();
                retry = false;
            } catch (InterruptedException e) {
                // we will try it again and again...
            }
        } 
    }
}

class drawThread extends Thread {
    private SurfaceHolder _surfaceHolder;
    private designCanvas _panel;
    private boolean _run = false;
        
    public drawThread(SurfaceHolder surfaceHolder, designCanvas panel) {
        _surfaceHolder = surfaceHolder;
        _panel = panel;
    }
        
    public void setRunning(boolean run) {
        _run = run;
    }
        
    public SurfaceHolder getSurfaceHolder() {
        return _surfaceHolder;
    }
        
    public void run() {
        Canvas c;
        while (_run) {
            c = null;
            try {
                c = _surfaceHolder.lockCanvas(null);
                synchronized (_surfaceHolder) { 
                    _panel.onDraw(c);
                }
            } finally {
                // do this in a finally so that if an exception is thrown
                // during the above, we don't leave the Surface in an
                // inconsistent state
                if (c != null) {
                    _surfaceHolder.unlockCanvasAndPost(c);
                }
            }
        }
    }
}

class GraphicObject {
    /**
     * Contains the coordinates of the graphic.
     */
    public class Coordinates {
        private int _x = 100;
        private int _y = 0;
 
        public int getX() {
            return _x + _bitmap.getWidth() / 2;
        }
 
        public void setX(int value) {
            _x = value - _bitmap.getWidth() / 2;
        }
 
        public int getY() {
            return _y + _bitmap.getHeight() / 2;
        }
 
        public void setY(int value) {
            _y = value - _bitmap.getHeight() / 2;
        }
 
        public String toString() {
            return "Coordinates: (" + _x + "/" + _y + ")";
        }
    }
    
    private Bitmap _bitmap;
    private Coordinates _coordinates;

    public GraphicObject(Bitmap bitmap) {
        _bitmap = bitmap;
        _coordinates = new Coordinates();
    }

    public Bitmap getGraphic() {
        return _bitmap;
    }

    public Coordinates getCoordinates() {
        return _coordinates;
    }
}

and finally, the new_product.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="fill_parent" >

<view class="com.odhranlynch.interiordesigner.NewProduct$designCanvas"
    android:id="@+id/surfaceView"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_alignParentTop="true" />

             ... Code snipped ...

</RelativeLayout>

Sorry for the amount of code above, it just I’m curious as to where I’m wrong.
Many thanks in advance 🙂

Answer 1

Here is there useful post ofcourse
Error inflating inner class view

and the last thing which helped was to change
in layout xml <view class= to <View class=
because the layout XMLs are case sensitive.

an excerpt from here

http://developer.android.com/guide/topics/ui/declaring-layout.html

In general, the XML vocabulary for declaring UI elements closely follows the structure and naming of the classes and methods, where element names correspond to class names and attribute names correspond to methods. In fact, the correspondence is often so direct that you can guess what XML attribute corresponds to a class method, or guess what class corresponds to a given xml element. However, note that not all vocabulary is identical. In some cases, there are slight naming differences. For example, the EditText element has a text attribute that corresponds to EditText.setText().