/**

* 单个单词可以显示在两行的TextView

* 缺点：setTextView时如果设置了SpannableString,则还需要调用本TextView的setSpan方法再次设置,而且由于Text换行导致设置Spannable时可能出现异常

* Created by lupeng.kang on 17/1/10.

*/

public class BreakTextView extends TextView {

private boolean mEnabled = true;

public BreakTextView(Context context) {

super(context);

}

public BreakTextView(Context context, AttributeSet attrs) {

super(context, attrs);

}

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

super(context, attrs, defStyleAttr);

}

/**

* 设置单行展示不下一个单词时是否自动截断

*

* @param enable

*/

public void setAutoSplit(boolean enable) {

mEnabled = enable;

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

if (getWidth() > 0 && getHeight() > 0 && mEnabled) {

CharSequence newText = autoSplitText(this);

if (!TextUtils.isEmpty(newText)) {

setText(newText);

}

}

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

}

/**

* 自动折断单词

* 实现思路：测量TextView宽度时，测量每行Text的宽度，如果一行展示不下某个单词，就将这个单词折断

*

* @param tv

* @return

*/

private CharSequence autoSplitText(final TextView tv) {

final CharSequence rawCharSequence = tv.getText();

final String rawText = rawCharSequence.toString(); //原始文本

final Paint tvPaint = tv.getPaint(); //paint，包含字体等信息

final float tvWidth = tv.getWidth() - tv.getPaddingLeft() - tv.getPaddingRight(); //控件可用宽度

//将原始文本按行拆分

String[] rawTextLines = rawText.replaceAll("\r", "").split("\n");

StringBuilder sbNewText = new StringBuilder();

for (String rawTextLine : rawTextLines) {

if (tvPaint.measureText(rawTextLine) <= tvWidth) {

//如果整行宽度在控件可用宽度之内，就不处理了

sbNewText.append(rawTextLine);

} else {

//如果整行宽度超过控件可用宽度，则按字符测量，在超过可用宽度的前一个字符处手动换行

float lineWidth = 0;

for (int cnt = 0; cnt != rawTextLine.length(); ++cnt) {

char ch = rawTextLine.charAt(cnt);

lineWidth

+= tvPaint.measureText(String.valueOf(ch));

if (lineWidth <= tvWidth) {

sbNewText.append(ch);

} else {

if (cnt - 2 >= 0 && rawTextLine.charAt(cnt - 1) >= 'A' && rawTextLine.charAt(cnt - 1) <= 'z' && rawTextLine.charAt(cnt - 2) >= 'A' && rawTextLine.charAt(cnt - 2) <= 'z') {

sbNewText.deleteCharAt(sbNewText.length() - 1);

sbNewText.append("-\n");

lineWidth = 0;

cnt -= 2;

} else {

sbNewText.append("\n");

lineWidth = 0;

--cnt;

}

}

}

}

sbNewText.append("\n");

}