android--设置TextView部分文字的颜色和背景(高亮显示)

设置部分文字背景高亮显示：

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Java代码





public class HighLightActivity extends Activity {

String strs="我的心太乱了，给我点空白。";

TextView textview;

int start =3;

int end = 5;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.high_light);

textview=(TextView)findViewById(R.id.textview);

SpannableStringBuilder style=new SpannableStringBuilder(strs);

style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

textview.setText(style);

}

}

[java] view
plaincopy

public class HighLightActivity extends Activity {

String strs="我的心太乱了，给我点空白。";

TextView textview;

int start =3;

int end = 5;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.high_light);

textview=(TextView)findViewById(R.id.textview);

SpannableStringBuilder style=new SpannableStringBuilder(strs);

style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

textview.setText(style);

}

}

显示效果：



同时设置文字和背景高亮显示：

Java代码





package com.justel.contact;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.text.Spannable;

import android.text.SpannableStringBuilder;

import android.text.style.BackgroundColorSpan;

import android.text.style.ForegroundColorSpan;

import android.widget.TextView;

public class HighLightActivity extends Activity {

String strs="我的心太乱了，给我点空白。";

TextView textview;

int start =3;

int end = 5;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.high_light);

textview=(TextView)findViewById(R.id.textview);

SpannableStringBuilder style=new SpannableStringBuilder(strs);

style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

style.setSpan(new ForegroundColorSpan(Color.RED),7,9,Spannable.SPAN_EXCLUSIVE_INCLUSIVE);

textview.setText(style);

}

}

[java] view
plaincopy

package com.justel.contact;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.text.Spannable;

import android.text.SpannableStringBuilder;

import android.text.style.BackgroundColorSpan;

import android.text.style.ForegroundColorSpan;

import android.widget.TextView;

public class HighLightActivity extends Activity {

String strs="我的心太乱了，给我点空白。";

TextView textview;

int start =3;

int end = 5;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.high_light);

textview=(TextView)findViewById(R.id.textview);

SpannableStringBuilder style=new SpannableStringBuilder(strs);

style.setSpan(new BackgroundColorSpan(Color.RED),start,end,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

style.setSpan(new ForegroundColorSpan(Color.RED),7,9,Spannable.SPAN_EXCLUSIVE_INCLUSIVE);

textview.setText(style);

}

}

显示效果：



参数说明：

Spannable.SPAN_EXCLUSIVE_EXCLUSIVE

API里面解释：Spans of type SPAN_EXCLUSIVE_EXCLUSIVE do not expand to include text inserted at either their starting or ending point. They can never have a length of 0 and are
automatically removed from the buffer if all the text they cover is removed.

即在原文本头或尾追加新文本的样式不受原文本样式影响，原文本高亮，新追加文本不高亮。

Spannable.SPAN_EXCLUSIVE_INCLUSIVE

API里面解释：Non-0-length spans of type SPAN_INCLUSIVE_EXCLUSIVE expand to include text inserted at their ending point but not at their starting point. When 0-length, they behave
like points.

即在原文本尾追加新文本的样式受原文本样式影响，原来文本尾高亮，新追加文本也高亮。