Android入门:TextView

一、设置部分字体的颜色


通过

SpannableStringBuilder style = new SpannableStringBuilder(CharSequence cs);

style.setSpan(new ForegroundColorSpan(color), begin, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

tv.setText(style);

设置,由于此种方法比较复杂,我实现了一个辅助类,能够快速实现部分字体的颜色;

final class TextViewUtil{
	public static CharSequence setTextColor(CharSequence str,int begin,int end,int color){
		SpannableStringBuilder style = new SpannableStringBuilder(str);
		style.setSpan(new ForegroundColorSpan(color), begin, end, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
		return style;
	} 
}

测试代码:

package org.xiazdong;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ForegroundColorSpan;
import android.widget.TextView;

public class MainActivity extends Activity {
	private TextView tv;
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv = (TextView)findViewById(R.id.tv);
        String str = "hello,xiazdong";
        CharSequence cq = TextViewUtil.setTextColor(str, 0, 2, Color.RED);
        cq = TextViewUtil.setTextColor(cq, 2, 5, Color.GREEN);
        tv.setText(cq);
    }
}

实现效果:



二、实现跑马灯效果(滚动字幕)


在main.xml布局文件的<TextView>中设置如下:

android:singleLine="true"
       	android:focusable="true"
       	android:ellipsize="marquee"
       	android:marqueeRepeatLimit="marquee_forever"
       	android:focusableInTouchMode="true"

实现效果:




三、实现超链


在<TextView>中设置如下:

android:autolink="all",则如果TextView中字符串为“hello,xiazdong's blog:http://blog.csdn.net/xiazdong,     phone:12345678901”

则会自动识别 http://blog.csdn.net/xiazdong和12345678901;












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