Android自定义控件LinkTextView的实现
@author:郑海波 http://blog.csdn.net/nuptboyzhb/
相关博客:http://blog.csdn.net/nuptboyzhb/article/details/7880916
功能:设计一个TextView,当点击该TextView时,会打开相应的链接。
如图:
LinkTextView类的定义:
[java]code
package com.example.njupt.zhb.linktext;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.net.Uri;import android.view.View;import android.view.View.OnClickListener;import android.util.AttributeSet;/* [email protected]: ZhengHaibo *web: blog.csdn.net/nuptboyzhb *mail: [email protected] *2012-8-31 Nanjing njupt */public class LinkTextView extends View implements OnClickListener{ String UrlText; Activity ParentActivity; Paint paint=new Paint(); int color=Color.RED; public LinkTextView(Context context) { super(context); setClickable(true); this.setOnClickListener(this); // TODO Auto-generated constructor stub } public LinkTextView(Context context,AttributeSet attrs){ super(context,attrs); setClickable(true); this.setOnClickListener(this); } [email protected]("DrawAllocation") @Override protected void onDraw(Canvas canvas){ super.onDraw(canvas); paint.setAntiAlias(true); paint.setStrokeWidth(1); paint.setColor(color); //canvas.drawLine(left, bottom, left+100, bottom, paint); int width=getWidth(); int height=getHeight(); int textwidth=getTextWidth(); int x_pos=(int)((width-textwidth)/2); height=(int)(height*0.67); canvas.drawText(UrlText, x_pos, height, paint); paint.setStrokeWidth(1); paint.setColor(Color.BLUE); canvas.drawLine(x_pos, height, textwidth+x_pos, height, paint); } @Override public void onClick(View v) { // TODO Auto-generated method stub Uri uri = Uri.parse(UrlText); Intent it = new Intent(Intent.ACTION_VIEW,uri); ParentActivity.startActivity(it); color=Color.BLACK; this.invalidate(); } public void setUrl(Activity ParentActivity,String text){ UrlText=text; this.ParentActivity=ParentActivity; } private int getTextWidth(){ int len=UrlText.length(); return len*6; } }
LinkTextView的简单说明:
1.onDraw函数主要是将设置的字符串画出来,并且在字符串下面画一个下划线,看起来像一个链接
2.实现了OnClickListener接口,当用户点击链接时,通过启动一个Intent,在系统的浏览器中打开该链接。
LinkTextView的使用:
1. 布局文件:
<com.example.njupt.zhb.linktext.LinkTextView android:id="@+id/linktext" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
2. MainActivity定义一个LinkTextView类的对象,并与布局文件相关联。
LinkTextView m_LinkTextView;m_LinkTextView=(LinkTextView)findViewById(R.id.linktext);
3. 设置Url
m_LinkTextView.setUrl(this,"http://blog.csdn.net/nuptboyzhb/");
4. Manifest.xml上网权限
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
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