Keine Reaktion onTouchEvent Android

Question

Ich versuche eine Zeichnungs-App zu erstellen. Zuerst habe ich versucht, etwas auf den Bildschirm zu zeichnen, das funktioniert. Jetzt versuche ich einen Kreis zu bilden, um meinem Finger zu folgen. Dies funktioniert nicht, die App läuft und es gibt keine Fehler oder Warnungen beim Kompilieren. Was ist falsch und wie repariere ich es?

Ich denke, die onTouchEvent wird nie aufgerufen.

mein viewclass:

package gorrebeeck.david.dgor.eazydraw; 

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.drawable.ShapeDrawable; 
import android.graphics.drawable.shapes.OvalShape; 
import android.view.MotionEvent; 
import android.view.View; 
import android.widget.Toast; 

public class CustomDrawableView extends View { 
    private ShapeDrawable mDrawable; 

    int x = 10; 
    int y = 10; 

    @Override 
    public boolean onTouchEvent(MotionEvent e) { 
     this.x=(int)e.getX(); 
     this.y=(int)e.getY(); 
     this.invalidate(); 
     return true; 
    } 

    public CustomDrawableView(Context context) { 
     super(context); 

     int width = 50; 
     int height = 50; 

     mDrawable = new ShapeDrawable(new OvalShape()); 
     mDrawable.getPaint().setColor(0xff74AC23); 
     mDrawable.setBounds(x, y, x + width, y + height); 
    } 

    protected void onDraw(Canvas canvas) { 
     mDrawable.draw(canvas); 
    } 
} 

Klasse, das ist geladen:

package gorrebeeck.david.dgor.eazydraw; 

import android.content.Intent; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.MotionEvent; 
import android.view.View; 
import android.widget.Toast; 

import java.util.Random; 

public class workspace extends AppCompatActivity { 

    CustomDrawableView mCustomDrawableView; 

    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     mCustomDrawableView = new CustomDrawableView(this); 

     setContentView(mCustomDrawableView); 

    } 
} 

Warnungen beim Laufen:

06-21 16:05:14.834 2380-2543/gorrebeeck.david.dgor.eazydraw E/Surface:getSlotFromBufferLocked: unknown buffer: 0x7ffe7a162850 
06-21 16:05:14.839 2380-2543/gorrebeeck.david.dgor.eazydraw D/OpenGLRenderer: endAllStagingAnimators on 0x7ffe71d90400 (RippleDrawable) with handle 0x7ffe71d1aac0 
06-21 16:05:16.719 2380-2380/gorrebeeck.david.dgor.eazydraw W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=435.89355, y[0]=759.9121, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=63310, downTime=61173, deviceId=0, source=0x1002 } 
06-21 16:05:16.719 2380-2380/gorrebeeck.david.dgor.eazydraw W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=435.89355, y[0]=759.9121, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=63310, downTime=61173, deviceId=0, source=0x1002 } 
06-21 16:05:16.719 2380-2380/gorrebeeck.david.dgor.eazydraw W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=435.89355, y[0]=759.9121, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=63310, downTime=61173, deviceId=0, source=0x1002 } 
06-21 16:05:16.719 2380-2380/gorrebeeck.david.dgor.eazydraw W/ViewRootImpl: Cancelling event due to no window focus: MotionEvent { action=ACTION_CANCEL, actionButton=0, id[0]=0, x[0]=435.89355, y[0]=759.9121, toolType[0]=TOOL_TYPE_FINGER, buttonState=0, metaState=0, flags=0x0, edgeFlags=0x0, pointerCount=1, historySize=0, eventTime=63310, downTime=61173, deviceId=0, source=0x1002 } 

Answer 1

Hier ist ein Beispiel ist und versuchen, diese

public class MainActivity extends Activity { 

DrawingView dv ; 
private Paint mPaint;  

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    dv = new DrawingView(this); 
    setContentView(dv); 
    mPaint = new Paint(); 
    mPaint.setAntiAlias(true); 
    mPaint.setDither(true); 
    mPaint.setColor(Color.GREEN); 
    mPaint.setStyle(Paint.Style.STROKE); 
    mPaint.setStrokeJoin(Paint.Join.ROUND); 
    mPaint.setStrokeCap(Paint.Cap.ROUND); 
    mPaint.setStrokeWidth(12); 
} 

public class DrawingView extends View { 

    public int width; 
    public int height; 
    private Bitmap mBitmap; 
    private Canvas mCanvas; 
    private Path mPath; 
    private Paint mBitmapPaint; 
    Context context; 
    private Paint circlePaint; 
    private Path circlePath; 

    public DrawingView(Context c) { 
     super(c); 
     context=c; 
     mPath = new Path(); 
     mBitmapPaint = new Paint(Paint.DITHER_FLAG); 
     circlePaint = new Paint(); 
     circlePath = new Path(); 
     circlePaint.setAntiAlias(true); 
     circlePaint.setColor(Color.BLUE); 
     circlePaint.setStyle(Paint.Style.STROKE); 
     circlePaint.setStrokeJoin(Paint.Join.MITER); 
     circlePaint.setStrokeWidth(4f); 
    } 

    @Override 
    protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
     super.onSizeChanged(w, h, oldw, oldh); 

     mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
     mCanvas = new Canvas(mBitmap); 
    } 

    @Override 
    protected void onDraw(Canvas canvas) { 
     super.onDraw(canvas); 

     canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); 
     canvas.drawPath(mPath, mPaint); 
     canvas.drawPath(circlePath, circlePaint); 
    } 

    private float mX, mY; 
    private static final float TOUCH_TOLERANCE = 4; 

    private void touch_start(float x, float y) { 
     mPath.reset(); 
     mPath.moveTo(x, y); 
     mX = x; 
     mY = y; 
    } 

    private void touch_move(float x, float y) { 
     float dx = Math.abs(x - mX); 
     float dy = Math.abs(y - mY); 
     if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { 
      mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); 
      mX = x; 
      mY = y; 

      circlePath.reset(); 
      circlePath.addCircle(mX, mY, 30, Path.Direction.CW); 
     } 
    } 

    private void touch_up() { 
     mPath.lineTo(mX, mY); 
     circlePath.reset(); 
     // commit the path to our offscreen 
     mCanvas.drawPath(mPath, mPaint); 
     // kill this so we don't double draw 
     mPath.reset(); 
    } 

    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
     float x = event.getX(); 
     float y = event.getY(); 

     switch (event.getAction()) { 
      case MotionEvent.ACTION_DOWN: 
       touch_start(x, y); 
       invalidate(); 
       break; 
      case MotionEvent.ACTION_MOVE: 
       touch_move(x, y); 
       invalidate(); 
       break; 
      case MotionEvent.ACTION_UP: 
       touch_up(); 
       invalidate(); 
       break; 
     } 
     return true; 
    } 
} 

}

starten, indem Sie gehen durch die Fingerpaint-Demo in der sdk Probe