Android之路-TextView组件
Android之路-TextView组件
今天主要介绍的UI组件为:
TextView
会演示TextView怎样将文本带上边框
与超文本链接
TextView
自定义带边框的TextView
1.activity文件
- package cn.class3g.activity;
- import Android.content.Context;
- import android.graphics.Canvas;
- import android.graphics.Paint;
- import android.util.AttributeSet;
- import android.widget.TextView;
- public class MyBorderTextView extends TextView{
- //必须实现带两个参数的构造
- public MyBorderTextView(Context context, AttributeSet attrs) {
- super(context, attrs);
- }
- //覆盖父类的onDraw方法
- public void onDraw(Canvas canvas){
- super.onDraw(canvas);
- //创建画刷
- Paint paint = new Paint();
- //设置颜色
- paint.setColor(android.graphics.Color.GREEN);
- //开画
- canvas.drawLine(0, 0, this.getWidth()-1, 0, paint);//左边框
- canvas.drawLine(0, 0,0,this.getHeight()-1, paint);//上边框
- canvas.drawLine(this.getWidth()-1, 0, this.getWidth()-1, this.getHeight()-1, paint);//右边框
- canvas.drawLine(0,this.getHeight()-1, this.getWidth()-1, this.getHeight()-1, paint);//下边框
- //canvas.drawLine(开始横坐标,开始纵坐标,结束横坐标,结束纵坐标)
- }
- }
2.layout文件
- <cn.class3g.activity.MyBorderTextView
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:padding="30dp"
- android:layout_margin="10dp"
- android:textColor="#cccccc"
- android:text="一雨落尘"
- />
Layout文件中定义了内外边距,文本内容,颜色
显示效果:
超文本链接
1、Activity文件
- package cn.class3g.activity;
- import android.app.Activity;
- import android.os.Bundle;
- import android.text.Html;
- import android.widget.TextView;
- public class TextViewTestActivity extends Activity {
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.auto_link);
- //Html.fromHtml方法
- TextView tv = (TextView) this.findViewById(R.id.tvHtml);
- String htmlStr = "<font color='#00FF22'>我爱北京天安门</font>" +//改变字体颜色的一种方法
- "<a href='http://www.ifeng.com'>小桥流水</a>";//具有超链接外观,但是不能跳转
- tv.setText(Html.fromHtml(htmlStr));
- }
- }
注:Html.fromHtml()方法的查连接徒具其形,但不能跳转
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