Android输入框带删除按钮的自定义View

来源：互联网发布：qt多线程编程编辑：程序博客网时间：2024/05/22 06:17

废话不多说，用最少的代码来实现，记得弄一张名字叫 common_ic_delete 做完删除的图到drawable里。

package com.aiitec.widgets;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.text.TextUtils;import android.util.AttributeSet;import android.view.MotionEvent;import android.widget.EditText;/** * @author Anthony * @createTime 2016-06-20 * 带删除按钮的输入框，点击X就删除文字，并提供一个删除监听接口 * */public class DeleteEditText extends EditText {    private int padding, drawablePadding;    private Bitmap deleteImg ;    private int deleteX, deleteY, deleteW, deleteH;    public DeleteEditText(Context context){        super(context);        init();    }    public DeleteEditText(Context context, AttributeSet attrs){        super(context, attrs);        init();    }    public DeleteEditText(Context context, AttributeSet attrs, int defStyleAttr){        super(context, attrs, defStyleAttr);        init();    }    private void init(){        padding = dip2px(getContext(), 4);        drawablePadding = dip2px(getContext(), 8);        int backgroundRec = getResources().getIdentifier("common_ic_delete", "drawable", getContext().getPackageName());        if (backgroundRec > 0) {            Drawable drawable = getResources().getDrawable(backgroundRec);            deleteImg = ((BitmapDrawable) drawable).getBitmap();        }    }    public void setPadding(int padding) {        this.padding = padding;    }    public void setDrawablePadding(int drawablePadding) {        this.drawablePadding = drawablePadding;    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if(!TextUtils.isEmpty(getText().toString().trim()) && deleteImg != null){            int x = getWidth() - deleteImg.getWidth()- drawablePadding-padding;            int y = (getHeight() - deleteImg.getHeight())>>1;            //删除按钮区域比，按钮大4dp            deleteX = x-padding;            deleteW = x + deleteImg.getWidth() + padding;            deleteY = y - padding;            deleteH = y + deleteImg.getHeight() + padding;            Paint paint = new Paint();            canvas.drawBitmap(deleteImg, x, y, paint);        }    }    private long downTime ;    @Override    public boolean dispatchTouchEvent(MotionEvent event) {        switch(event.getAction()){            case MotionEvent.ACTION_DOWN:                downTime = System.currentTimeMillis();                break;            case MotionEvent.ACTION_UP:                long upTime = System.currentTimeMillis();                if(upTime-downTime < 500 ){                    //短按才算，长按不算                    if(event.getX() > deleteX && event.getX()<deleteW && event.getY() > deleteY && event.getY()<deleteH){                        //点击删除按钮区域                        setText("");                        if(onDeleteListener != null){                            onDeleteListener.onDelete();                        }                    }                }                break;        }        return super.dispatchTouchEvent(event);    }    private OnDeleteListener onDeleteListener;    public void setOnDeleteListener(OnDeleteListener onDeleteListener) {        this.onDeleteListener = onDeleteListener;    }    /**     * 删除按钮监听接口     */    public interface OnDeleteListener{        void onDelete();    };    public static int dip2px(Context context, float dpValue) {        float scale = context.getResources().getDisplayMetrics().density;        return (int)(dpValue * scale + 0.5F);    }}

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