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<String> getContentList(String content) {
ArrayList<String> 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<String> 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
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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">
<com.example.zhangyipeng.gradually_show_text.view.XTextView
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"
/>
</RelativeLayout>
Paste_Image.png
4.运行效果如下（再贴一次哈）：
showText3.gif
Demo地址：github
