区域选定（类似截图，可拖动）

拼搏现实的明天。 2022-05-18 04:25 145阅读 0赞

/**
     * Created by ylWang on 2018/7/23 18:22.
     */
    
    public class MarkView extends RelativeLayout {
        private ImageView ivTouch;
        private RelativeLayout rlRect, rlRoot;
        private LinearLayout llSummit;
        private TextView tvCancel, tvSure;
        private MarkView markView;
    
        public MarkView(Context context) {
            super(context);
            initViews(context);
        }
    
        public MarkView(Context context, AttributeSet attrs) {
            super(context, attrs);
            initViews(context);
        }
    
        public MarkView(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            initViews(context);
        }
    
        private <T extends View> T f(int resId) {
            return (T) findViewById(resId);
        }
    
        private void initViews(Context context) {
            markView = this;
            LayoutInflater.from(context).inflate(R.layout.view_mark, this, true);
            ivTouch = f(R.id._iv_touch);
            rlRect = f(R.id._rl_rect);
            llSummit = f(R.id._ll_summit);
            tvSure = f(R.id._tv_sure);
            tvCancel = f(R.id._tv_cancel);
            rlRoot = f(R.id._rl_root);
            setListener();
        }
    
        private static final String TAG = "@@@";
        private int lastX, lastY, offsetX, offsetY;
        private final static int MIN_WH = 50;
        private int toRight, toBottom;
    
        private void setListener() {
    
            ivTouch.setOnTouchListener(new OnTouchListener() {
    
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    int x = (int) event.getX();
                    int y = (int) event.getY();
                    switch (event.getAction()) {
                        case MotionEvent.ACTION_DOWN:
                            llSummit.setVisibility(INVISIBLE);
                            lastX = x;
                            lastY = y;
                            break;
                        case MotionEvent.ACTION_MOVE:
                            offsetX = x - lastX;
                            offsetY = y - lastY;
                            toRight = rlRect.getRight() + offsetX;
                            toBottom = rlRect.getBottom() + offsetY;
                            if ((rlRect.getLeft() + MIN_WH > toRight) || (rlRect.getTop() + MIN_WH > toBottom)) {//控制最小区域
                                break;
                            } else if (toRight > rlRoot.getRight() || toBottom > rlRoot.getBottom()) {//不许出界
                                break;
                            } else {
                                ivTouch.offsetLeftAndRight(offsetX);
                                ivTouch.offsetTopAndBottom(offsetY);
                                llSummit.offsetLeftAndRight(offsetX);
                                llSummit.offsetTopAndBottom(offsetY);
                                rlRect.layout(rlRect.getLeft(), rlRect.getTop(), toRight, toBottom);
                                areaListener.changePoint(getPosition(rlRect, rlRoot));
                            }
                            break;
                        case MotionEvent.ACTION_UP:
                            llSummit.setVisibility(VISIBLE);
                            break;
                        default:
                            break;
                    }
                    return true;
                }
            });
    
            rlRect.setOnTouchListener(new OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    int x = (int) event.getX();
                    int y = (int) event.getY();
                    switch (event.getAction()) {
                        case MotionEvent.ACTION_DOWN:
                            llSummit.setVisibility(INVISIBLE);
                            lastX = x;
                            lastY = y;
                            break;
                        case MotionEvent.ACTION_MOVE:
                            offsetX = x - lastX;
                            offsetY = y - lastY;
                            if (-offsetX > rlRect.getLeft()
                                    || rlRect.getRight() + offsetX > rlRoot.getRight()
                                    || -offsetY > rlRect.getTop()
                                    || rlRect.getBottom() + offsetY > rlRoot.getBottom()
                                    ) {
                                break;
                            } else {
                                ivTouch.offsetLeftAndRight(offsetX);
                                ivTouch.offsetTopAndBottom(offsetY);
                                rlRect.offsetLeftAndRight(offsetX);
                                rlRect.offsetTopAndBottom(offsetY);
                                llSummit.offsetLeftAndRight(offsetX);
                                llSummit.offsetTopAndBottom(offsetY);
                                areaListener.changePoint(getPosition(rlRect, rlRoot));
                            }
                            break;
                        case MotionEvent.ACTION_UP:
                            llSummit.setVisibility(VISIBLE);
                            break;
                        default:
                            break;
                    }
    
                    return true;
                }
            });
            ClickListener listener = new ClickListener();
            tvSure.setOnClickListener(listener);
            tvCancel.setOnClickListener(listener);
        }
    
        private final class ClickListener implements OnClickListener {
    
            @Override
            public void onClick(View view) {
                switch (view.getId()) {
                    case R.id._tv_sure:
                        Log.d(TAG, "Sure_onTouch: " + Arrays.toString(getPosition(rlRect, rlRoot)));
                        areaListener.setPoints(getPosition(rlRect, rlRoot));
                        ((ViewGroup) markView.getParent()).removeView(markView);
                        break;
                    case R.id._tv_cancel:
                        areaListener.cancel();
                        ((ViewGroup) markView.getParent()).removeView(markView);
                        break;
                    default:
                        break;
                }
            }
        }
    
        private int[] getPosition(View view, ViewGroup viewRoot) {
            return new int[]{view.getLeft(), view.getTop(), view.getRight(), view.getBottom(), viewRoot.getRight(), viewRoot.getBottom()};
        }
    
        public interface AreaListener {
            void changePoint(int[] pos);
    
            void setPoints(int[] pos);
    
            void cancel();
        }
    
        private AreaListener areaListener;
    
        public void setAreaListener(AreaListener areaListener) {
            this.areaListener = areaListener;
        }

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/_rl_root"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <RelativeLayout
            android:id="@+id/_rl_rect"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:layout_centerInParent="true"
            android:layout_gravity="center"
            android:background="@drawable/red_rect"/>
    
        <ImageView
            android:id="@+id/_iv_touch"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_below="@id/_rl_rect"
            android:layout_marginLeft="-20dp"
            android:layout_marginTop="-20dp"
            android:layout_toRightOf="@id/_rl_rect"
            android:background="@drawable/red_point" />
    
        <LinearLayout
            android:id="@+id/_ll_summit"
            android:layout_width="65dp"
            android:layout_height="30dp"
            android:layout_above="@id/_iv_touch"
            android:layout_marginRight="30dp"
            android:layout_toLeftOf="@id/_iv_touch"
            android:background="@android:color/holo_orange_dark"
            android:orientation="horizontal">
    
            <TextView
                android:id="@+id/_tv_cancel"
                android:layout_width="30dp"
                android:layout_height="30dp"
                android:background="@android:color/holo_blue_bright"
                android:gravity="center"
                android:text="No" />
    
            <TextView
                android:id="@+id/_tv_sure"
                android:layout_width="30dp"
                android:layout_height="30dp"
                android:layout_marginLeft="5dp"
                android:background="@android:color/holo_green_light"
                android:gravity="center"
                android:text="Yes" />
        </LinearLayout>
    </RelativeLayout>