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En mi aplicación de Android, tengo una imagen de recorte. Entonces, estoy programando una vista personalizada como mi cuadro de recorte. Puedo mover el cuadro de recorte. Pero mi problema es cómo puedo arrastrar el borde del cuadro de recorte y cambiar su ancho y alto. ¿Cómo puedo hacerlo?Cambiar el ancho y la altura de vista personalizada en Android
Attr Clase:
public class Attr {
public static final float CROP_BOX_START_X = 5;
public static final float CROP_BOX_START_Y = 5;
public static final float CROP_BOX_END_X = 305;
public static final float CROP_BOX_END_Y = 105;
}
CropBox Clase:
public class CropBox extends View {
private Paint paint = new Paint();
public CropBox(Context context) {
super(context);
}
public CropBox(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
}
@Override
public void onDraw(Canvas canvas) {
float[][] circleXY = {
{Attr.CROP_BOX_START_X, Attr.CROP_BOX_START_Y},
{(Attr.CROP_BOX_START_X + Attr.CROP_BOX_END_X)/2, Attr.CROP_BOX_START_Y},
{Attr.CROP_BOX_END_X, Attr.CROP_BOX_START_Y},
{Attr.CROP_BOX_START_X, Attr.CROP_BOX_END_Y},
{(Attr.CROP_BOX_START_X + Attr.CROP_BOX_END_X)/2, Attr.CROP_BOX_END_Y},
{Attr.CROP_BOX_END_X, Attr.CROP_BOX_END_Y},
{Attr.CROP_BOX_START_X, (Attr.CROP_BOX_START_Y + Attr.CROP_BOX_END_Y)/2},
{Attr.CROP_BOX_END_X, (Attr.CROP_BOX_START_Y + Attr.CROP_BOX_END_Y)/2}
};
float[][] lineXY = {
{Attr.CROP_BOX_START_X, Attr.CROP_BOX_START_Y, Attr.CROP_BOX_END_X, Attr.CROP_BOX_START_Y},
{Attr.CROP_BOX_START_X, Attr.CROP_BOX_END_Y, Attr.CROP_BOX_END_X, Attr.CROP_BOX_END_Y},
{Attr.CROP_BOX_START_X, Attr.CROP_BOX_START_Y, Attr.CROP_BOX_START_X, Attr.CROP_BOX_END_Y},
{Attr.CROP_BOX_END_X, Attr.CROP_BOX_START_Y, Attr.CROP_BOX_END_X, Attr.CROP_BOX_END_Y}
};
paint.setColor(Color.CYAN);
paint.setStrokeWidth(1);
for(int i = 0 ; i < circleXY.length ; i++)
canvas.drawCircle(circleXY[i][0], circleXY[i][1], 5, paint);
paint.setStrokeWidth(2);
for(int i = 0 ; i < lineXY.length ; i++)
canvas.drawLine(lineXY[i][0], lineXY[i][2], lineXY[i][2], lineXY[i][3], paint);
}
}
CropTestActivity Clase: Clase
public class CropTestActivity extends Activity {
private ImageView imageView;
private CropBox cropBox;
private RelativeLayout relativeLayout;
private RelativeLayout.LayoutParams layoutParams;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.crop_test_layout);
imageView = (ImageView)findViewById(R.id.android_image);
cropBox = new CropBox(this);
relativeLayout = (RelativeLayout)findViewById(R.id.crop_test_layout);
layoutParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT);
imageView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
public void onGlobalLayout() {
imageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
layoutParams.leftMargin = imageView.getWidth()/2 - (int)((Attr.CROP_BOX_START_X + Attr.CROP_BOX_END_X)/2) + imageView.getLeft();
layoutParams.topMargin = imageView.getHeight()/2 - (int)((Attr.CROP_BOX_START_Y + Attr.CROP_BOX_END_Y)/2) + imageView.getTop();
}
});
relativeLayout.addView(cropBox, layoutParams);
cropBox.setOnTouchListener(new Crop(imageView));
}
}
Cultivo:
public class Crop implements OnTouchListener {
private static final int NONE = 0;
private static final int BOX_DRAG = 1;
private static final int BORDER_DRAG = 2;
private int mode = NONE;
private float cropBoxStartX = Attr.CROP_BOX_START_X;
private float cropBoxStartY = Attr.CROP_BOX_START_Y;
private float cropBoxEndX = Attr.CROP_BOX_END_X;
private float cropBoxEndY = Attr.CROP_BOX_END_Y;
private ImageView imageView;
private PointF start = new PointF();
public Crop(ImageView imageView) {
this.imageView = imageView;
}
public boolean onTouch(View view, MotionEvent event) {
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams)view.getLayoutParams();
switch(event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
start.set(event.getX(), event.getY());
if(event.getX() > cropBoxStartX && event.getX() < cropBoxEndX && event.getY() > cropBoxStartY && event.getY() < cropBoxEndY)
mode = BOX_DRAG;
else if(event.getX() == cropBoxStartX || event.getX() == cropBoxEndX || event.getY() == cropBoxStartY || event.getY() == cropBoxEndY)
mode = BORDER_DRAG;
else
mode = NONE;
break;
case MotionEvent.ACTION_UP:
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
if(mode == BOX_DRAG) {
layoutParams.leftMargin = (int)event.getX() - (int)start.x + view.getLeft();
layoutParams.topMargin = (int)event.getY() - (int)start.y + view.getTop();
while(layoutParams.topMargin + 5 < imageView.getTop())
layoutParams.topMargin++;
while(layoutParams.leftMargin + (cropBoxEndX - cropBoxStartX + 5) > imageView.getRight())
layoutParams.leftMargin--;
while(layoutParams.topMargin + (cropBoxEndY - cropBoxStartY + 5) > imageView.getBottom())
layoutParams.topMargin--;
while(layoutParams.leftMargin + 5 < imageView.getLeft())
layoutParams.leftMargin++;
}
else if(mode == BORDER_DRAG) {
}
break;
}
view.setLayoutParams(layoutParams);
return true;
}
}
diseño xml:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/crop_test_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="@+id/android_image"
android:src="@drawable/android"
android:layout_width="fill_parent"
android:layout_height="300dp"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:layout_gravity="center"
android:scaleType="fitXY"
android:contentDescription="@string/android_image_description" >
</ImageView>
</RelativeLayout>
Antes de cambio de tamaño:
Después de cambio de tamaño:
Gracias por su ayuda.
¿Por qué declaraste tus atributos como 'final'. Si desea cambiarlos, ¿no debería declarar que no es definitivo? –
Sí, tienes razón. Debo declarar que no son definitivas. Pero no sé cómo puedo redimensionarlos. –