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);
    }
}