前面好多篇文章都是Android Studio、源码编译、ndk等相关教程，今天敲一敲代码，不然都生锈了哈_。

来个古装动画美图，缓解大家疲劳的眼睛...(话说有木有人知道这是谁？？？)

Paste_Image.png

这是一个类似rpg游戏人物对话，文本逐字显示的view，先上效果图，不然大家都没有兴趣看下去，嘿嘿。

Demo地址：github(喜欢的可以运行看看)

showText3.gif

注：我录制的gif是不是很清晰，想知道我用的是什么工具制作的吗？_ (评论中有方法喔)

思路：想让汉字、英文、数字、符号等逐个显示，首先想到的是字符串处理，写一个工具类拆分汉字、英文、数字、符号等，然后就是应用到Android的View上了，View上的实现其实很low，就是先使用工具类拆分一篇文本，然后将使用递归每隔300毫秒(时间可以修改)将文本画到View的Canvas上；大体思路就是这样。

注：不知道有没有已经造好轮子，我在网上没找到类似的。如果大家看过类似的又比较优秀的实现，麻烦在评论里发给我哈。

1.首先写字符串工具类XTextUtils.java，拆分字符串，代码如下：

/**

* Created by zhangyipeng on 16/3/16.

*/

public class XTextUtils {

private static final String TAG = "XTextUtils";

public static ArrayList getContentList(String content) {

ArrayList list = new ArrayList<>();

String s = "";

String n = "";

int sn = 0;

content+=" ";

int len = (content).length();

for (int i = 0; i < len; i++) {

char c = content.charAt(i);

char c_1 = ' ';

if(i>=1) {

c_1 = content.charAt(i - 1);

}

if (isEnglish(c + "") || (isEnglish(c_1+"") && (c+"").equals("'"))) {

s += c;

sn = 1;

}else if (isNumber(c + "") || (isNumber(c_1+"") && (c+"").equals("."))) {

n += c;

sn = 2;

} else {

if (!s.equals("") && !n.equals("") & sn==1) {

list.add(n+s);

}else if (!s.equals("") && !n.equals("") & sn==2) {

list.add(s+n);

}else if (!s.equals("") && n.equals("")) {

list.add(s);

}else if (!n.equals("") && s.equals("")) {

list.add(n);

}

list.add(c + "");

sn = 0;

n = "";

s = "";

}

}

return list;

}

public static boolean isEnglish(String s) {

Pattern p = Pattern.compile("^[a-zA-Z]*$");

Matcher m = p.matcher(s);

if (m.matches()) {

return true;

} else {

return false;

}

}

public static boolean isNumber(String s) {

Pattern p = Pattern.compile("^[0-9]*$");

Matcher m = p.matcher(s);

if (m.matches()) {

return true;

} else {

return false;

}

}

public static boolean isChinese(String s) {

Pattern p = Pattern.compile("^[\\u4E00-\\u9FA5\\uF900-\\uFA2D]*$");

Matcher m = p.matcher(s);

if (m.matches()) {

return true;

} else {

return false;

}

}

}

我们使用网上的任意一篇文章测试，这个工具类，效果如下图：

胡|歌|，|1982|年|9|月|20|日|出|生|于|上|海|市|徐|汇|区|，|中|国|内|地|演|员|、|歌|手|、|制|片|人|。|1996|年|，|14|岁|的|胡|歌|便|成|为|上|海|教|育|电|视|台|的|小|主|持|人|，|2001|年|考|入|上|海|戏|剧|学|院|表|演|系|。|2005|年|因|在|电|视|剧|《|仙|剑|奇|侠|传|》|中|成|功|塑|造|了|豪|爽|深|情|的|“|李|逍|遥|”|一|角|而|成|名|，|并|演|唱|插|曲|《|六|月|的|雨|》|《|逍|遥|叹|》|。|2009|年|在|“|80|后|新|生|代|娱|乐|大|明|星|”|评|选|中|获|封|“|四|大|小|生|”|之|一|。|

|First| |Flight|

|Mr|.| |Johnson| |had| |never| |been| |up| |in| |an| |aerophane| |before| |and| |he| |had| |read| |a| |lot| |about| |air| |accidents|,| |so| |one| |day| |when| |a| |friend| |offered| |to| |take| |him| |for| |a| |ride| |in| |his| |own| |small| |phane|,| |Mr|.| |Johnson| |was| |very| |worried| |about| |accepting|.| |Finally|,| |however|,| |his| |friend| |persuaded| |him| |that| |it| |was| |very| |safe|,| |and| |Mr|.| |Johnson| |boarded| |the| |plane|.|

|His| |friend| |started| |the| |engine| |and| |began| |to| |taxi| |onto| |the| |runway| |of| |the| |airport|.| |Mr|.| |Johnson| |had| |heard| |that| |the| |most| |dangerous| |part| |of| |a| |flight| |were| |the| |take|-|off| |and| |the| |landing|,| |so| |he| |was| |extremely| |frightened| |and| |closed| |his| |eyes|.|

|After| |a| |minute| |or| |two| |he| |opened| |them| |again|,| |looked| |out| |of| |the| |window| |of| |the| |plane|,| |and| |said| |to| |his| |friend|,| |"|Look| |at| |those| |people| |down| |there|.| |They| |look| |as| |small| |as| |ants|,| |don't| |they|?|"|

|"|Those| |are| |ants|,|"| |answered| |his| |friend|.| |"|We're| |still| |on| |the| |ground|.|"| |

Paste_Image.png

2.好了下面开始自定义View类的coding了，代码如下：

注：如果直接使用canvas.drawText()的话，很难根据屏幕的宽度自动换行，还好Andorid为我们提供了StaticLayout类，使用它可以轻松的实现文本自动换行，以及行间距、对其方式(居左对齐、居中对其、居右对齐)等。

/**

* Created by zhangyipeng on 16/3/16.

*/

public class XTextView extends View {

private TextPaint textPaint;

private float density;

private String textContent;

private int textColor;

private String textAlignment;

private float textSize;

private float textSpacingAdd;

private float textSpacingMult;

public XTextView(Context context) {

this(context, null, 0);

}

public XTextView(Context context, AttributeSet attrs) {

this(context, attrs, 0);

}

public XTextView(Context context, AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.XTextView);

textContent = a.getString(R.styleable.XTextView_textContent);

textColor = a.getColor(R.styleable.XTextView_textColor, Color.BLACK);

textAlignment = a.getString(R.styleable.XTextView_textXAlignment);

textSize = a.getDimension(R.styleable.XTextView_textSize, 20);

textSpacingAdd = a.getFloat(R.styleable.XTextView_textSpacingAdd, 0.0F);

textSpacingMult = a.getFloat(R.styleable.XTextView_textSpacingMult, 1.0F);

init();

}

public void setTextSize(float textSize) {

this.textSize = textSize;

}

public void setTextSpacingAdd(float textSpacingAdd) {

this.textSpacingAdd = textSpacingAdd;

}

public void setTextSpacingMult(float textSpacingMult) {

this.textSpacingMult = textSpacingMult;

}

public void setTextColor(int textColor) {

this.textColor = textColor;

}

public void setTextAlignment(String textAlignment) {

this.textAlignment = textAlignment;

}

public void setTextContent(final String content) {

new Thread(){

@Override

public void run() {

super.run();

contents = XTextUtils.getContentList(content);

}

}.run();

}

private ArrayList contents;

private void init() {

density = getResources().getDisplayMetrics().density;

textPaint = new TextPaint();

textPaint.setColor(textColor);

textPaint.setTextSize(textSize);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

drawText(canvas);

}

private int cnt = 0;

private String totalText = "";

private void drawText(Canvas canvas) {

if (cnt >= contents.size()) {

return;

}

totalText += contents.get(cnt);

StaticLayout layout = null;

if (textAlignment.equals("normal")) {

//textPaint(TextPaint 类型)设置了字符串格式及属性的画笔,240为设置画多宽后换行，后面的参数是对齐方式及行间距

layout = new StaticLayout(totalText, textPaint, getWidth() - (int) (20 * density), Layout.Alignment.ALIGN_NORMAL, textSpacingMult, textSpacingAdd, true);

} else if (textAlignment.equals("center")) {

layout = new StaticLayout(totalText, textPaint, getWidth() - (int) (20 * density), Layout.Alignment.ALIGN_CENTER, textSpacingMult, textSpacingAdd, true);

} else if (textAlignment.equals("opposite")) {

layout = new StaticLayout(totalText, textPaint, getWidth() - (int) (20 * density), Layout.Alignment.ALIGN_OPPOSITE, textSpacingMult, textSpacingAdd, true);

}

//从 (10,10)的位置开始绘制

canvas.translate(10 * density, 10 * density);

layout.draw(canvas);

cnt++;

startText();

}

public void startText() {

if (cnt != contents.size()) {

new Handler().postDelayed(new Runnable() {

@Override

public void run() {

invalidate();

}

}, time);

}

}

private long time = 200;

public void setDelayPlayTime(long time) {

this.time = time;

}

}

3.接下来就是调用了，运行了，如下图

layout文件如下

xmlns:tools="http://schemas.android.com/tools"

xmlns:app="http://schemas.android.com/apk/res-auto"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context="com.example.zhangyipeng.graduallyshowtext.TargetActivity">

android:id="@+id/xtv"

android:layout_width="match_parent"

android:layout_height="match_parent"

app:textXAlignment="normal"

app:textColor="#ff003b"

app:textSize="20sp"

app:textContent="你好"

app:textSpacingMult="1.5"

app:textSpacingAdd="0.0"

/>

Paste_Image.png

4.运行效果如下(再贴一次哈)：

showText3.gif

Demo地址：github