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谁能告诉我如何在视图类中创建一个 onclicklistenr ..

我创建了一个应用程序，例如通过从相机获取图像在画布上绘图。我在视图类中使用框架布局创建了一些自定义按钮。但我无法在视图类中创建 onclicklistener ....

这是我在画布上绘制的子活动

 public class MesureSizeActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         setContentView(R.layout.button);
     }
    }

我的视图类是

public class MyView extends View {



private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
private Paint mPaint;
boolean calibrate=true;
int calibrate_x;
int calibrate_y;
int calibrate_radius;

//Event listener controller

boolean listener_calibrate= true;

public MyView(Context c) {
    super(c);
    mBitmap = MainActivity.getBitmap();
    mPath = new Path();
    mBitmapPaint = new Paint(Paint.DITHER_FLAG);

    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setDither(true);
    mPaint.setColor(0xFFFFFF11);
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    // mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(2);
}

public MyView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mBitmap = MainActivity.getBitmap();
    mPath = new Path();
    mBitmapPaint = new Paint(Paint.DITHER_FLAG);

    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setDither(true);
    mPaint.setColor(0xFFFFFF11);
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    // mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(2);
}

public MyView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}


@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    mBitmap = Bitmap.createScaledBitmap(mBitmap, w, h, true);
    mCanvas = new Canvas(mBitmap);
    calibrate_x = w /2;
    calibrate_y = h/2;
    calibrate_radius = 50;

}

@Override
protected void onDraw(Canvas canvas) {
    canvas.drawColor(0xFFAAAAAA);

    canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);

      canvas.drawCircle(calibrate_x,calibrate_y,calibrate_radius,mPaint);
    canvas.drawPath(mPath, mPaint);

}

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;
    }
}

private void touch_up() {
    mPath.lineTo(mX, mY);
    // 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;
  }

 public void onClick(View v) {

  if(v.getId() == R.id.up)
  {
    //Do some thing


  }

 if(v.getId() == R.id.down)
 {
    //Do some thing


  }

 }

 }

我的xml看起来像

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
        android:visibility="visible"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

<com.example.sizemesurment_1.MyView
    android:id="@+id/DrawViewId"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    </com.example.sizemesurment_1.MyView >

 <RelativeLayout
     android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal"
    android:gravity="bottom">



    <ImageButton
        android:id="@+id/up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="80dp"
         android:onClick="ButtonOnClick"          
        android:src="@drawable/up" />

    <ImageButton
        android:id="@+id/down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="120dp"  
        android:onClick="ButtonOnClick"    
        android:src="@drawable/down" />


    </RelativeLayout>
</FrameLayout>

当我按下按钮时，出现如下错误

在 id 为“up”的视图类 android.widget.Button 上的 onClick 处理程序的活动类 com.example.sizemesurment_1.MesureSizeActivity 中找不到方法 ButtonOnClick(View)

我做错什么了吗..我是初学者....请帮忙....

提前致谢.....

4

1 回答 1

2

ButtonOnClick在您的活动类中添加方法...

public class MesureSizeActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         setContentView(R.layout.button);
     }

     public void ButtonOnClick(View view){
            //here you can handle click event
     }
    }
于 2012-10-01T10:20:38.187 回答