Java 在Android中更改自定义视图宽度和高度
在我的android应用程序中,我有一个裁剪图像。因此,我编写了一个自定义视图作为裁剪框。我可以移动收割机。但我的问题是如何拖动裁剪框的边框并更改其宽度和高度。我怎么做 属性类:Java 在Android中更改自定义视图宽度和高度,java,android,android-layout,crop,android-view,Java,Android,Android Layout,Crop,Android View,在我的android应用程序中,我有一个裁剪图像。因此,我编写了一个自定义视图作为裁剪框。我可以移动收割机。但我的问题是如何拖动裁剪框的边框并更改其宽度和高度。我怎么做 属性类: 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_
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类:
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);
}
}
作物类别:
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;
}
}
public类Crop实现了ontouch侦听器{
私有静态final int NONE=0;
专用静态最终整型框_DRAG=1;
私有静态最终整型边界_阻力=2;
私有int模式=无;
私有浮动cropBoxStartX=Attr.CROP_BOX_START_X;
私有浮动cropBoxStartY=Attr.CROP_BOX_START_Y;
私有浮动CropBox=Attr.CROP\u BOX\u END\u X;
私有浮动cropBoxEndY=Attr.CROP\u BOX\u END\Y;
私人影像视图;
private PointF start=new PointF();
公共作物(图像视图){
this.imageView=imageView;
}
公共布尔onTouch(视图、运动事件){
RelativeLayout.LayoutParams LayoutParams=(RelativeLayout.LayoutParams)视图。getLayoutParams();
开关(event.getAction()&MotionEvent.ACTION\u掩码){
case MotionEvent.ACTION\u DOWN:
set(event.getX(),event.getY());
if(event.getX()>cropBoxStartX&&event.getX()cropBoxStartY&&event.getY()imageView.getRight()
layoutParams.leftMargin--;
while(layoutParams.topMargin+(cropBoxEndY-cropBoxStartY+5)>imageView.getBottom()
layoutParams.topMargin--;
while(layoutParams.leftMargin+5
布局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>
调整大小之前:
调整大小后:
感谢您的帮助。以下是解决方案 修改的onCreate from活动
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, imageView);
relativeLayout = (RelativeLayout)findViewById(R.id.crop_test_layout);
relativeLayout.addView(cropBox);
}
修改的CropBox类别:
public class CropBox extends View {
private static final int CROP_BOX_START_X = 5;
private static final int CROP_BOX_START_Y = 5;
private static final int CROP_BOX_END_X = 305;
private static final int CROP_BOX_END_Y = 105;
private static final int DRAG_SQUARE = 75;
public ImageView mImageView;
boolean mIsFirstClick = false;
private Paint paint = new Paint();
private Rect mRect;
public CropBox(Context context, ImageView aBaseView) {
super(context);
mImageView = aBaseView;
mRect = new Rect(CROP_BOX_START_X, CROP_BOX_START_Y, CROP_BOX_END_X, CROP_BOX_END_Y);
setOnTouchListener(new Crop());
}
public CropBox(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
}
@Override
public void onDraw(Canvas canvas) {
paint.setStrokeWidth(2);
paint.setColor(Color.CYAN);
paint.setStyle(Paint.Style.STROKE);
canvas.drawRect(mRect, paint);
canvas.drawLine(mRect.right-DRAG_SQUARE, mRect.bottom-DRAG_SQUARE,
mRect.right, mRect.bottom-DRAG_SQUARE, paint);
canvas.drawLine(mRect.right-DRAG_SQUARE, mRect.bottom-DRAG_SQUARE,
mRect.right-DRAG_SQUARE, mRect.bottom, paint);
}
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 PointF start = new PointF();
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() <= mRect.right && event.getX() >=(mRect.right - DRAG_SQUARE))
&& (event.getY() >= mRect.top && event.getY() >=(mRect.bottom - DRAG_SQUARE))){
mode = BORDER_DRAG;
mIsFirstClick = false;
}
else if(mRect.contains((int)event.getX(), (int)event.getY())) {
mode = BOX_DRAG;
if (mIsFirstClick){
mRect = new Rect(CROP_BOX_START_X, CROP_BOX_START_Y,
CROP_BOX_END_X, CROP_BOX_END_Y);
mIsFirstClick = false;
} else {
mIsFirstClick = true;
}
}
else{
mode = NONE;
mIsFirstClick = true;
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
mIsFirstClick = false;
if(mode == BOX_DRAG) {
layoutParams.leftMargin = (int)event.getX() - (int)start.x + view.getLeft();
layoutParams.topMargin = (int)event.getY() - (int)start.y + view.getTop();
}
else if(mode == BORDER_DRAG) {
if (event.getX() > view.getLeft() && event.getY() > view.getTop()){
mRect.right = (int) event.getX();
mRect.bottom = (int) event.getY();
}
}
while(layoutParams.topMargin + 5 < mImageView.getTop())
layoutParams.topMargin++;
while(layoutParams.leftMargin + mRect.right > mImageView.getRight())
layoutParams.leftMargin--;
while(layoutParams.topMargin + mRect.bottom > mImageView.getBottom())
layoutParams.topMargin--;
while(layoutParams.leftMargin + 5 < mImageView.getLeft())
layoutParams.leftMargin++;
break;
}
view.setLayoutParams(layoutParams);
invalidate();
return true;
}
}
}
公共类CropBox扩展视图{
专用静态最终整数裁剪框开始X=5;
专用静态最终整数裁剪框开始Y=5;
专用静态最终整数裁剪框结束X=305;
专用静态最终整数裁剪框结束Y=105;
专用静态最终整数拖动平方=75;
公共图像视图mImageView;
布尔值mIsFirstClick=false;
私人油漆=新油漆();
私人直肠;
公共CropBox(上下文,ImageView-aBaseView){
超级(上下文);
mImageView=aBaseView;
mRect=新矩形(裁剪框开始、裁剪框开始、裁剪框结束、裁剪框结束);
setOnTouchListener(新裁剪());
}
公共CropBox(上下文、属性集、属性集){
super(上下文、属性集);
}
@凌驾
公共空白onDraw(画布){
油漆。设置行程宽度(2);
油漆.setColor(颜色为青色);
绘制.设置样式(绘制.样式.笔划);
画布.drawRect(mRect,油漆);
画布.抽绳(mRect.right-DRAG\u SQUARE,mRect.bottom-DRAG\u SQUARE,
mRect.right,mRect.bottom-DRAG_SQUARE,paint);
画布.抽绳(mRect.right-DRAG\u SQUARE,mRect.bottom-DRAG\u SQUARE,
mRect.右拖拽(方形,mRect.底部,油漆);
}
类Crop实现OnTouchListener{
私有静态final int NONE=0;
专用静态最终整型框_DRAG=1;
私有静态最终整型边界_阻力=2;
私有int模式=无;
private PointF start=new PointF();
公共布尔onTouch(视图、运动事件){
RelativeLayout.LayoutParams LayoutParams=(RelativeLayout.LayoutParams)视图。getLayoutParams();
开关(event.getAction()&MotionEvent.ACTION\u掩码){
case MotionEvent.ACTION\u DOWN:
set(event.getX(),event.getY());
if((event.getX()=(mRect.right-拖动_SQUARE))
&&(event.getY()>=mRect.top&&event.getY()>=(mRect.bottom-DRAG_SQUARE))){
模式=边界拖动;
mIsFirstClick=false;
}
else if(mRect.contains((int)event.getX(),(int)event.getY()){
模式=长方体拖动;
如果(单击错误){
mRect=新矩形(裁剪框开始,裁剪框开始,
裁剪盒(末端)X、裁剪盒(末端)Y);
mIsFirstClick=false;
}否则{
mIsFirstClick=true;
}
}
否则{
模式=无;
mIsFirstClick=true;
}
打破
case MotionEvent.ACTION\u UP:
模式=无;
打破
public class CropBox extends View {
private static final int CROP_BOX_START_X = 5;
private static final int CROP_BOX_START_Y = 5;
private static final int CROP_BOX_END_X = 305;
private static final int CROP_BOX_END_Y = 105;
private static final int DRAG_SQUARE = 75;
public ImageView mImageView;
boolean mIsFirstClick = false;
private Paint paint = new Paint();
private Rect mRect;
public CropBox(Context context, ImageView aBaseView) {
super(context);
mImageView = aBaseView;
mRect = new Rect(CROP_BOX_START_X, CROP_BOX_START_Y, CROP_BOX_END_X, CROP_BOX_END_Y);
setOnTouchListener(new Crop());
}
public CropBox(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
}
@Override
public void onDraw(Canvas canvas) {
paint.setStrokeWidth(2);
paint.setColor(Color.CYAN);
paint.setStyle(Paint.Style.STROKE);
canvas.drawRect(mRect, paint);
canvas.drawLine(mRect.right-DRAG_SQUARE, mRect.bottom-DRAG_SQUARE,
mRect.right, mRect.bottom-DRAG_SQUARE, paint);
canvas.drawLine(mRect.right-DRAG_SQUARE, mRect.bottom-DRAG_SQUARE,
mRect.right-DRAG_SQUARE, mRect.bottom, paint);
}
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 PointF start = new PointF();
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() <= mRect.right && event.getX() >=(mRect.right - DRAG_SQUARE))
&& (event.getY() >= mRect.top && event.getY() >=(mRect.bottom - DRAG_SQUARE))){
mode = BORDER_DRAG;
mIsFirstClick = false;
}
else if(mRect.contains((int)event.getX(), (int)event.getY())) {
mode = BOX_DRAG;
if (mIsFirstClick){
mRect = new Rect(CROP_BOX_START_X, CROP_BOX_START_Y,
CROP_BOX_END_X, CROP_BOX_END_Y);
mIsFirstClick = false;
} else {
mIsFirstClick = true;
}
}
else{
mode = NONE;
mIsFirstClick = true;
}
break;
case MotionEvent.ACTION_UP:
mode = NONE;
break;
case MotionEvent.ACTION_MOVE:
mIsFirstClick = false;
if(mode == BOX_DRAG) {
layoutParams.leftMargin = (int)event.getX() - (int)start.x + view.getLeft();
layoutParams.topMargin = (int)event.getY() - (int)start.y + view.getTop();
}
else if(mode == BORDER_DRAG) {
if (event.getX() > view.getLeft() && event.getY() > view.getTop()){
mRect.right = (int) event.getX();
mRect.bottom = (int) event.getY();
}
}
while(layoutParams.topMargin + 5 < mImageView.getTop())
layoutParams.topMargin++;
while(layoutParams.leftMargin + mRect.right > mImageView.getRight())
layoutParams.leftMargin--;
while(layoutParams.topMargin + mRect.bottom > mImageView.getBottom())
layoutParams.topMargin--;
while(layoutParams.leftMargin + 5 < mImageView.getLeft())
layoutParams.leftMargin++;
break;
}
view.setLayoutParams(layoutParams);
invalidate();
return true;
}
}
}