android - 为 EditText 的 Drawable 右侧设置 onClickListener

Question

在我的应用程序中，我有一个 EditText右侧有一个搜索图标。我使用了下面给出的代码。

 <EditText
        android:id="@+id/search"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_margin="4dip"
        android:layout_weight="1"
        android:background="@drawable/textfield_search1"
        android:drawableLeft="@drawable/logo"
        android:drawableRight="@drawable/search_icon"
        android:hint="Search Anything..."
        android:padding="4dip"
        android:singleLine="true" />

我想设置onClickListener将搜索图标图像分配给右侧可绘制对象 的EditText 。怎么可能？

Answer 1

public class CustomEditText extends androidx.appcompat.widget.AppCompatEditText {

    private Drawable drawableRight;
    private Drawable drawableLeft;
    private Drawable drawableTop;
    private Drawable drawableBottom;

    int actionX, actionY;

    private DrawableClickListener clickListener;

    public CustomEditText (Context context, AttributeSet attrs) {
        super(context, attrs);
        // this Contructure required when you are using this view in xml
    }

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

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

    }

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

    @Override
    public void setCompoundDrawables(Drawable left, Drawable top,
            Drawable right, Drawable bottom) {
        if (left != null) {
            drawableLeft = left;
        }
        if (right != null) {
            drawableRight = right;
        }
        if (top != null) {
            drawableTop = top;
        }
        if (bottom != null) {
            drawableBottom = bottom;
        }
        super.setCompoundDrawables(left, top, right, bottom);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Rect bounds;
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            actionX = (int) event.getX();
            actionY = (int) event.getY();
            if (drawableBottom != null
                    && drawableBottom.getBounds().contains(actionX, actionY)) {
                clickListener.onClick(DrawablePosition.BOTTOM);
                return super.onTouchEvent(event);
            }

            if (drawableTop != null
                    && drawableTop.getBounds().contains(actionX, actionY)) {
                clickListener.onClick(DrawablePosition.TOP);
                return super.onTouchEvent(event);
            }

            // this works for left since container shares 0,0 origin with bounds
            if (drawableLeft != null) {
                bounds = null;
                bounds = drawableLeft.getBounds();

                int x, y;
                int extraTapArea = (int) (13 * getResources().getDisplayMetrics().density  + 0.5);

                x = actionX;
                y = actionY;

                if (!bounds.contains(actionX, actionY)) {
                    /** Gives the +20 area for tapping. */
                    x = (int) (actionX - extraTapArea);
                    y = (int) (actionY - extraTapArea);

                    if (x <= 0)
                        x = actionX;
                    if (y <= 0)
                        y = actionY;

                    /** Creates square from the smallest value */
                    if (x < y) {
                        y = x;
                    }
                }

                if (bounds.contains(x, y) && clickListener != null) {
                    clickListener
                            .onClick(DrawableClickListener.DrawablePosition.LEFT);
                    event.setAction(MotionEvent.ACTION_CANCEL);
                    return false;

                }
            }

            if (drawableRight != null) {

                bounds = null;
                bounds = drawableRight.getBounds();

                int x, y;
                int extraTapArea = 13;

                /**
                 * IF USER CLICKS JUST OUT SIDE THE RECTANGLE OF THE DRAWABLE
                 * THAN ADD X AND SUBTRACT THE Y WITH SOME VALUE SO THAT AFTER
                 * CALCULATING X AND Y CO-ORDINATE LIES INTO THE DRAWBABLE
                 * BOUND. - this process help to increase the tappable area of
                 * the rectangle.
                 */
                x = (int) (actionX + extraTapArea);
                y = (int) (actionY - extraTapArea);

                /**Since this is right drawable subtract the value of x from the width 
                * of view. so that width - tappedarea will result in x co-ordinate in drawable bound. 
                */
                x = getWidth() - x;
                
                 /*x can be negative if user taps at x co-ordinate just near the width.
                 * e.g views width = 300 and user taps 290. Then as per previous calculation
                 * 290 + 13 = 303. So subtract X from getWidth() will result in negative value.
                 * So to avoid this add the value previous added when x goes negative.
                 */
                 
                if(x <= 0){
                    x += extraTapArea;
                }
                
                 /* If result after calculating for extra tappable area is negative.
                 * assign the original value so that after subtracting
                 * extratapping area value doesn't go into negative value.
                 */               
                 
                if (y <= 0)
                    y = actionY;                

                /**If drawble bounds contains the x and y points then move ahead.*/
                if (bounds.contains(x, y) && clickListener != null) {
                    clickListener
                            .onClick(DrawableClickListener.DrawablePosition.RIGHT);
                    event.setAction(MotionEvent.ACTION_CANCEL);
                    return false;
                }
                return super.onTouchEvent(event);
            }           

        }
        return super.onTouchEvent(event);
    }

    @Override
    protected void finalize() throws Throwable {
        drawableRight = null;
        drawableBottom = null;
        drawableLeft = null;
        drawableTop = null;
        super.finalize();
    }

    public void setDrawableClickListener(DrawableClickListener listener) {
        this.clickListener = listener;
    }

}

同时创建一个界面

public interface DrawableClickListener {

    public static enum DrawablePosition { TOP, BOTTOM, LEFT, RIGHT };
    public void onClick(DrawablePosition target); 
    }

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同时在 Activity 文件中的 View 上设置drawableClickListener。

editText.setDrawableClickListener(new DrawableClickListener() {
        
         
        public void onClick(DrawablePosition target) {
            switch (target) {
            case LEFT:
                //Do something here
                break;

            default:
                break;
            }
        }
        
    });