点击TextView 弹出复制选项

extends:http://www.eoeandroid.com/thread-226805-1-1.html

package com.dotfive.chuanbang.view;



import android.content.Context;

import android.graphics.Color;

import android.graphics.drawable.Drawable;

import android.graphics.drawable.ShapeDrawable;

import android.graphics.drawable.shapes.OvalShape;

import android.text.ClipboardManager;

import android.util.AttributeSet;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.PopupWindow;

import android.widget.PopupWindow.OnDismissListener;



import com.dotfive.chuanbang.R;

import com.rockerhieu.emojicon.EmojiconTextView;



public class CopyTextView extends EmojiconTextView {

    private Context mContext;

    private PopupWindow mPopupWindow;



    public CopyTextView(Context context, AttributeSet attrs) {

        super(context, attrs);

        mContext = context;

        this.setOnLongClickListener( new OnLongClickListener() {

            @Override

            public boolean onLongClick(View v) {

                setTextColor(Color.BLACK);

                getPopupWindowsInstance();

                mPopupWindow.showAsDropDown(CopyTextView.this,getWidth()/2-mPopupWindow.getWidth()/2,0);

                return true;

            }

        });

    }



    @Override

    public boolean onTouchEvent(MotionEvent event) {

        return super.onTouchEvent(event);

    }

    /**

     * 销毁 PopupWindow

     */

    private void dismissPopupWindowInstance(){

        if (null != mPopupWindow) {

            mPopupWindow.dismiss();

        }

    }

    /**

     * 获得 PopupWindow 实例

     */

    private void getPopupWindowsInstance(){

        if(mPopupWindow!=null){

            mPopupWindow.dismiss();

        }else{

            initPopuptWindow();

        }

    }

    /*

     * 创建PopupWindow

     */

    private void initPopuptWindow() {

        LayoutInflater layoutInflater = LayoutInflater.from(mContext);

        View popupWindow = layoutInflater.inflate(R.layout.item_textview_copy_popup_window, null);

        Button btnCopy = (Button) popupWindow.findViewById(R.id.btnCopy);

        btnCopy.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                setTextColor(android.graphics.Color.BLACK);

                dismissPopupWindowInstance();

                ClipboardManager clipboard = (ClipboardManager) mContext.getSystemService(Context.CLIPBOARD_SERVICE);

                clipboard.setText(getText());

            }

        });

        //  此处 之所以  给了 PopupWindow  一个 固定的宽度  是因为 我要让 PopupWindow 的中心位置对齐  TextView的中心位置

        //  一开始 写成了ViewGroup.LayoutParams.WRAP_CONTENT  但是  各种尝试之后 我没办法 得到 PopupWindow 的宽度 如果你能获得的话 麻烦留言 告诉我

        mPopupWindow = new PopupWindow(popupWindow, dipTopx(mContext, 50),ViewGroup.LayoutParams.WRAP_CONTENT);

        // 这行代码 很重要

        mPopupWindow.setBackgroundDrawable(getDrawable());

        mPopupWindow.setOutsideTouchable(true);

        mPopupWindow.setOnDismissListener(new OnDismissListener() {

            @Override

            public void onDismiss() {

                setTextColor(mContext.getResources().getColorStateList(R.color.littleGray));

            }

        });

    }

    /**

     * 生成一个 透明的背景图片

     * @return

     */

    private Drawable getDrawable(){

        ShapeDrawable bgdrawable =new ShapeDrawable(new OvalShape());

        bgdrawable.getPaint().setColor(getResources().getColor(android.R.color.transparent));

        return   bgdrawable;

    }

    /**

     * 转换成对应的px值

     * @param context

     * @param dipValue

     * @return

     */

    public static int dipTopx(Context context, float dipValue){

        final float scale = context.getResources().getDisplayMetrics().density;

        return (int)(dipValue * scale + 0.5f);

    }

}