关于Android的文字排版和换行问题，彻底解决

package com.text.view;

import java.util.Arrays;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;

public class MyView extends View {
private Paint mPaint = new Paint();

public MyView(Context context) {
this(context,null);
}

public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}

public MyView(Context context, AttributeSet attrs) {
this(context,attrs,0);
}

private void init() {
mPaint.setAntiAlias(true);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Style.STROKE);
mPaint.setTextSize(getRawSize(TypedValue.COMPLEX_UNIT_DIP, 12));

}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//setMeasuredDimension(300, 200);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//canvas.drawColor(Color.WHITE);

FontMetrics fm = mPaint.getFontMetrics();

float baseline = fm.descent - fm.ascent;
float x = 0;
float y = baseline;

//注释掉的是当使用多段TextView时使用
String txt1 = getResources().getString(com.middle.sport.R.string.more1);
//String txt2 = getResources().getString(com.middle.sport.R.string.more2);
//String txt3 = getResources().getString(com.middle.sport.R.string.more3);

String[] text1s = autoSplit(txt1, mPaint, getWidth() - 15);
//String[] text2s = autoSplit(txt2, mPaint, getWidth() - 15);
//String[] text3s = autoSplit(txt3, mPaint, getWidth() - 15);

System.out.printf("line indexs: %s\n", Arrays.toString(text1s));
//System.out.printf("line indexs: %s\n", Arrays.toString(text2s));
//System.out.printf("line indexs: %s\n", Arrays.toString(text3s));

for(String text1 : text1s) {
canvas.drawText(text1, x, y, mPaint);
y += baseline + fm.leading;
}
/* y += 20;
for(String text2 : text2s) {
canvas.drawText(text2, x, y, mPaint);
y += baseline + fm.leading;
}
y += 20;
for(String text3 : text3s) {
canvas.drawText(text3, x, y, mPaint);
y += baseline + fm.leading;
}*/
}
private String[] autoSplit(String content, Paint p, float width) {
int length = content.length();
float textWidth = p.measureText(content);
if(textWidth <= width) {
return new String[]{content};
}

int start = 0, end = 1, i = 0;
int lines = (int) Math.ceil(textWidth / width);
String[] lineTexts = new String[lines];
while(start < length) {
if(p.measureText(content, start, end) > width) {
lineTexts[i++] = (String) content.subSequence(start, end);
start = end;
}
if(end == length) {
lineTexts[i] = (String) content.subSequence(start, end);
break;
}
end += 1;
}
return lineTexts;
}
public float getRawSize(int unit, float size) {
Context c = getContext();
Resources r;

if (c == null)
r = Resources.getSystem();
else
r = c.getResources();

return TypedValue.applyDimension(unit, size, r.getDisplayMetrics());
}
}

更多相关文章

随机推荐