public class AlignTextView extends AppCompatTextView {

private List lines = new ArrayList(); // 分割后的行

private List tailLines = new ArrayList(); // 尾行

private Align align = Align.ALIGN_LEFT; // 默認最后一行左對齊

private float lineSpacingMultiplier = 1.0f;

private float lineSpacingAdd = 0.0f;

String oldText;

// 尾行對齊方式

public enum Align {

ALIGN_LEFT, ALIGN_CENTER, ALIGN_RIGHT // 居中，居左，居右,針對段落最后一行

}

public AlignTextView(Context context) {

super(context);

setTextIsSelectable(false);

}

public AlignTextView(Context context, AttributeSet attrs) {

super(context, attrs);

setTextIsSelectable(false);

lineSpacingMultiplier = attrs.getAttributeFloatValue("http://schemas.android" + "" +

".com/apk/res/android", "lineSpacingMultiplier", 1.0f);

int[] attributes = new int[]{android.R.attr.lineSpacingExtra};

TypedArray arr = context.obtainStyledAttributes(attrs, attributes);

lineSpacingAdd = arr.getDimensionPixelSize(0, 0);

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 計算寬度

int heightMode = MeasureSpec.getMode(heightMeasureSpec);

int heightSize = MeasureSpec.getSize(heightMeasureSpec);

if (heightMode == MeasureSpec.EXACTLY) {

// 確定高度，直接返回

setMeasuredDimension(getMeasuredWidth(), heightSize);

} else {

recalc();

int height = lines.size() * getLineHeight();

if (heightMode == MeasureSpec.AT_MOST) {

// 最小高度

setMeasuredDimension(getMeasuredWidth(), Math.min(heightSize, height));

} else {

setMeasuredDimension(getMeasuredWidth(), height);

}

}

}

@Override

protected void onDraw(Canvas canvas) {

TextPaint paint = getPaint();

paint.setColor(getCurrentTextColor());

paint.drawableState = getDrawableState();

Paint.FontMetrics fm = paint.getFontMetrics();

float firstHeight = getTextSize() - (fm.bottom - fm.descent + fm.ascent - fm.top);

int gravity = getGravity();

if ((gravity & 0x1000) == 0) { // 是否垂直居中

firstHeight = firstHeight + (getTextSize() - firstHeight) / 2;

}

int paddingTop = getPaddingTop();

int paddingLeft = getPaddingLeft();

int paddingRight = getPaddingRight();

int width = getMeasuredWidth() - paddingLeft - paddingRight;

for (int i = 0; i < lines.size(); i++) {

float drawY = i * getLineHeight() + firstHeight;

String line = lines.get(i);

// 繪畫起始x坐標

float drawSpacingX = paddingLeft;

float gap = (width - paint.measureText(line));

float interval = gap / (line.length() - 1);

// 繪制最后一行

if (tailLines.contains(i)) {

interval = 0;

if (align == Align.ALIGN_CENTER) {

drawSpacingX += gap / 2;

} else if (align == Align.ALIGN_RIGHT) {

drawSpacingX += gap;

}

}

for (int j = 0; j < line.length(); j++) {

float drawX = paint.measureText(line.substring(0, j)) + interval * j;

canvas.drawText(line.substring(j, j + 1), drawX + drawSpacingX, drawY + paddingTop, paint);

}

}

}

/**

* 設置尾行對齊方式

*

* @param align 對齊方式

*/

public void setAlign(Align align) {

this.align = align;

invalidate();

}

private void recalc() {

String text = getText().toString();

if (text.equals(oldText))

return;

oldText = text;

TextPaint paint = getPaint();

lines.clear();

tailLines.clear();

// 文本含有換行符時，分割單獨處理

String[] items = text.split("\\n");

for (String item : items) {

calc(paint, item);

}

}

/**

* 計算每行應顯示的文本數

*

* @param text 要計算的文本

*/

private void calc(Paint paint, String text) {

if (text.length() == 0) {

lines.add("\n");

return;

}

int width = getMeasuredWidth() - getPaddingLeft() - getPaddingRight();

int startPosition = 0; // 起始位置

StringBuilder sb = new StringBuilder();

for(int i = 0; i < text.length(); ++i) {

if(paint.measureText(text.substring(startPosition, i + 1)) > (float) width) {

startPosition = i;

this.lines.add(sb.toString());

sb = new StringBuilder();

i--;

} else {

sb.append(text.charAt(i));

}

}

if(sb.length() > 0) {

lines.add(sb.toString());

}

tailLines.add(Integer.valueOf(this.lines.size() - 1));

}

}

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