我看到了这个图书馆： https://github.com/bluejamesbond/TextJustify-Android 但它太复杂了，不知道如何使用它。我有一个TextView，它从java中的数据库以编程方式填充它。我如何使用简单的库来证明它的合理性？！
更新
我在Github找到了这个课，它很完美，但我不记得链接......！
public class JustifiedTextView extends View {
private Context mContext;
private XmlToClassAttribHandler mXmlParser;
private TextPaint textPaint;
private int lineSpace = 0;
private int lineHeight;
private int textAreaWidth;
private int measuredViewHeight, measuredViewWidth;
private String text;
private List<String> lineList = new ArrayList<String>();
/**
* when we want to draw text after view created to avoid loop in drawing we use this boolean
*/
boolean hasTextBeenDrown = false;
public JustifiedTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
constructor(context, attrs);
}
public JustifiedTextView(Context context, AttributeSet attrs) {
super(context, attrs);
constructor(context, attrs);
}
public JustifiedTextView(Context context) {
super(context);
constructor(context, null);
}
private void constructor(Context context, AttributeSet attrs) {
mContext = context;
mXmlParser = new XmlToClassAttribHandler(mContext, attrs);
initTextPaint();
if (attrs != null) {
String text;
int textColor;
int textSize;
int textSizeUnit;
text = mXmlParser.getTextValue();
textColor = mXmlParser.getColorValue();
textSize = mXmlParser.getTextSize();
textSizeUnit = mXmlParser.gettextSizeUnit();
setText(text);
setTextColor(textColor);
if (textSizeUnit == -1)
setTextSize(textSize);
else
setTextSize(textSizeUnit, textSize);
}
ViewTreeObserver observer = getViewTreeObserver();
observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (hasTextBeenDrown)
return;
hasTextBeenDrown = true;
setTextAreaWidth(getWidth() - (getPaddingLeft() + getPaddingRight()));
calculate();
}
});
}
private void calculate() {
setLineHeight(getTextPaint());
lineList.clear();
lineList = divideOriginalTextToStringLineList(getText());
setMeasuredDimentions(lineList.size(), getLineHeight(), getLineSpace());
measure(getMeasuredViewWidth(), getMeasuredViewHeight());
}
private void initTextPaint() {
textPaint = new TextPaint(TextPaint.ANTI_ALIAS_FLAG);
textPaint.setTextAlign( Paint.Align.RIGHT);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (getMeasuredViewWidth() > 0) {
requestLayout();
setMeasuredDimension(getMeasuredViewWidth(), getMeasuredViewHeight());
} else {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
invalidate();
}
private int rowIndex = 0, colIndex = 0;
@Override
protected void onDraw(Canvas canvas) {
rowIndex = getPaddingTop();
if (getAlignment() == Paint.Align.RIGHT)
colIndex = getPaddingLeft() + getTextAreaWidth();
else
colIndex = getPaddingLeft();
for (int i = 0; i < lineList.size(); i++) {
rowIndex += getLineHeight() + getLineSpace();
canvas.drawText(lineList.get(i), colIndex, rowIndex, getTextPaint());
}
}
/**
* this method get the string and divide it to a list of StringLines according to textAreaWidth
*
* @param originalText
* @return
*/
private List<String> divideOriginalTextToStringLineList(String originalText) {
List<String> listStringLine = new ArrayList<String>();
String line = "";
float textWidth;
String[] listParageraphes = originalText.split("\n");
for (int j = 0; j < listParageraphes.length; j++) {
String[] arrayWords = listParageraphes[j].split(" ");
for (int i = 0; i < arrayWords.length; i++) {
line += arrayWords[i] + " ";
textWidth = getTextPaint().measureText(line);
//if text width is equal to textAreaWidth then just add it to ListStringLine
if (getTextAreaWidth() == textWidth) {
listStringLine.add(line);
line = "";//make line clear
continue;
}
//else if text width excite textAreaWidth then remove last word and justify the StringLine
else if (getTextAreaWidth() < textWidth) {
int lastWordCount = arrayWords[i].length();
//remove last word that cause line width to excite textAreaWidth
line = line.substring(0, line.length() - lastWordCount - 1);
// if line is empty then should be skipped
if (line.trim().length() == 0)
continue;
//and then we need to justify line
line = justifyTextLine(textPaint, line.trim(), getTextAreaWidth());
listStringLine.add(line);
line = "";
i--;
continue;
}
//if we are now at last line of paragraph then just add it
if (i == arrayWords.length - 1) {
listStringLine.add(line);
line = "";
}
}
}
return listStringLine;
}
/**
* this method add space in line until line width become equal to textAreaWidth
*
* @param lineString
* @param lineWidth
* @param textAreaWidth
* @return
*/
private String justifyTextLine(TextPaint textPaint, String lineString, int textAreaWidth) {
int gapIndex = 0;
float lineWidth = textPaint.measureText(lineString);
while (lineWidth < textAreaWidth && lineWidth > 0) {
gapIndex = lineString.indexOf(" ", gapIndex + 2);
if (gapIndex == -1) {
gapIndex = 0;
gapIndex = lineString.indexOf(" ", gapIndex + 1);
if (gapIndex == -1)
return lineString;
}
lineString = lineString.substring(0, gapIndex) + " " + lineString.substring(gapIndex + 1, lineString.length());
lineWidth = textPaint.measureText(lineString);
}
return lineString;
}
/**
* this method calculate height for a line of text according to defined TextPaint
*
* @param textPaint
*/
private void setLineHeight(TextPaint textPaint) {
Rect bounds = new Rect();
String sampleStr = "این حسین کیست که عالم همه دیوانه اوست";
textPaint.getTextBounds(sampleStr, 0, sampleStr.length(), bounds);
setLineHeight(bounds.height());
}
/**
* this method calculate view's height according to line count and line height and view's width
*
* @param lineListSize
* @param lineHeigth
* @param lineSpace
*/
public void setMeasuredDimentions(int lineListSize, int lineHeigth, int lineSpace) {
int mHeight = lineListSize * (lineHeigth + lineSpace) + lineSpace;
mHeight += getPaddingRight() + getPaddingLeft();
setMeasuredViewHeight(mHeight);
setMeasuredViewWidth(getWidth());
}
private int getTextAreaWidth() {
return textAreaWidth;
}
private void setTextAreaWidth(int textAreaWidth) {
this.textAreaWidth = textAreaWidth;
}
private int getLineHeight() {
return lineHeight;
}
private int getMeasuredViewHeight() {
return measuredViewHeight;
}
private void setMeasuredViewHeight(int measuredViewHeight) {
this.measuredViewHeight = measuredViewHeight;
}
private int getMeasuredViewWidth() {
return measuredViewWidth;
}
private void setMeasuredViewWidth(int measuredViewWidth) {
this.measuredViewWidth = measuredViewWidth;
}
private void setLineHeight(int lineHeight) {
this.lineHeight = lineHeight;
}
public String getText() {
return text;
}
/**
* Sets the string value of the JustifiedTextView. JustifiedTextView does not accept HTML-like formatting.
* Related XML Attributes
* -noghteh:text
*
* @param text
*/
public void setText(String text) {
this.text = text;
calculate();
invalidate();
}
public void setText(int resid) {
setText(mContext.getResources().getString(resid));
}
public Typeface getTypeFace() {
return getTextPaint().getTypeface();
}
public void setTypeFace(Typeface typeFace) {
getTextPaint().setTypeface(typeFace);
}
public float getTextSize() {
return getTextPaint().getTextSize();
}
public void setTextSize(int unit, float textSize) {
textSize = TypedValue.applyDimension(unit, textSize, mContext.getResources().getDisplayMetrics());
setTextSize(textSize);
}
private void setTextSize(float textSize) {
getTextPaint().setTextSize(textSize);
calculate();
invalidate();
}
public TextPaint getTextPaint() {
return textPaint;
}
public void setTextPaint(TextPaint textPaint) {
this.textPaint = textPaint;
}
/**
* set text color
*
* @param textColor
*/
public void setTextColor(int textColor) {
getTextPaint().setColor(textColor);
invalidate();
}
/**
* define space between lines
*
* @param lineSpace
*/
public void setLineSpacing(int lineSpace) {
this.lineSpace = lineSpace;
invalidate();
}
/**
* @return text color
*/
public int getTextColor() {
return getTextPaint().getColor();
}
/**
* space between lines - default is 0
*
* @return
*/
public int getLineSpace() {
return lineSpace;
}
/**
* get text alignment
*
* @return
*/
public Paint.Align getAlignment() {
return getTextPaint().getTextAlign();
}
/**
* Align text according to your language
*
* @param align
*/
public void setAlignment(Paint.Align align) {
getTextPaint().setTextAlign(align);
invalidate();
}}
这个班级：
public class XmlToClassAttribHandler {
private Resources mRes;
private Context mContext;
private AttributeSet mAttributeSet;
private String namespace="http://noghteh.ir";
private final String KEY_TEXT="text";
private final String KEY_TEXT_SIZE="textSize";
private final String KEY_TEXT_COLOR="textColor";
public XmlToClassAttribHandler(Context context,AttributeSet attributeSet){
mContext=context;
mRes=mContext.getResources();
mAttributeSet=attributeSet;
}
public String getTextValue(){
String value=mAttributeSet.getAttributeValue(namespace, KEY_TEXT);
if (value==null)
return "";
if (value.length()>1 &&
value.charAt(0)=='@' &&
value.contains("@string/")){
int resId=mRes.getIdentifier(mContext.getPackageName()+":"+value.substring(1), null,null);
value=mRes.getString(resId);
}
return value;
}
public int getColorValue(){
String value=mAttributeSet.getAttributeValue(namespace, KEY_TEXT_COLOR);
int color= Color.BLACK;
if (value==null)
return color;
if (value.length()>1 &&
value.charAt(0)=='@' &&
value.contains("@color/")){
int resId=mRes.getIdentifier(mContext.getPackageName()+":"+value.substring(1), null,null);
color=mRes.getColor(resId);
return color;
}
try{
color=Color.parseColor(value);
}
catch(Exception e){
return Color.BLACK;
}
return color;
}
public int getTextSize() {
int textSize=12;
String value=mAttributeSet.getAttributeValue(namespace, KEY_TEXT_SIZE );
if (value==null)
return textSize;
if (value.length()>1 &&
value.charAt(0)=='@' &&
value.contains("@dimen/")){
int resId=mRes.getIdentifier(mContext.getPackageName()+":"+value.substring(1), null,null);
textSize=mRes.getDimensionPixelSize(resId);
return textSize;
}
try{
textSize=Integer.parseInt(value.substring(0, value.length()-2));
}
catch(Exception e){
return 12;
}
return textSize;
}
public int gettextSizeUnit() {
String value=mAttributeSet.getAttributeValue(namespace, KEY_TEXT_SIZE );
if (value==null)
return TypedValue.COMPLEX_UNIT_SP;
try{
String type=value.substring(value.length()-2, value.length());
if (type.equals("dp"))
return TypedValue.COMPLEX_UNIT_DIP;
else if (type.equals("sp"))
return TypedValue.COMPLEX_UNIT_SP;
else if (type.equals("pt"))
return TypedValue.COMPLEX_UNIT_PT;
else if (type.equals("mm"))
return TypedValue.COMPLEX_UNIT_MM;
else if (type.equals("in"))
return TypedValue.COMPLEX_UNIT_IN;
else if (type.equals("px"))
return TypedValue.COMPLEX_UNIT_PX;
}
catch(Exception e){
return -1;
}
return -1;
}}
然后在XML文件中定义JustifiedTextView而不是简单的TextView ...... !!
答案 0 :(得分：0)
按照自述文件中的说明进行操作。
添加到build.gradle
dependencies {
compile 'com.github.bluejamesbond:textjustify-android:2.1.1'
}
然后您定义DocumentView而不是TextView：
<com.bluejamesbond.text.DocumentView
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
你也可以使用https://github.com/merterhk/JustifiedTextView，这只是一个类，以避免必须合并一个新的库。