学习笔记---绘制文字

Paint和TextPaint，不能直接让文字换行。需要其他额外操作。

代码：
FontView

package com.chen.view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Typeface;import android.text.TextPaint;import android.util.AttributeSet;import android.view.View;public class FontView extends View {    //文字内容    private static final String TEXT = "没有设置字体属性：哈123哈abc嗯";    private static final String TEXT_1 = "DEFAULT：哈123哈哈abc嗯";    private static final String TEXT_2 = "DEFAULT_BOLD：哈123哈abc嗯";    private static final String TEXT_3 = "SANS_SERIF：哈123哈abc嗯";    private static final String TEXT_4 = "SERIF：哈123哈abc嗯";    private static final String TEXT_5 = "MONOSPACE：哈123哈abc嗯";    //文字画笔    private TextPaint textPaint;    private TextPaint textPaint_1;    private TextPaint textPaint_2;    private TextPaint textPaint_3;    private TextPaint textPaint_4;    private TextPaint textPaint_5;    private int baseX, baseY;    public FontView(Context context) {        this(context, null);    }    public FontView(Context context, AttributeSet attrs) {        this(context, attrs, -1);    }    public FontView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initPaint(context);    }    private void initPaint(Context context) {        textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);        textPaint.setTextSize(70);        /**         * 设置文本的对其方式，可供选的方式有三种：CENTER,LEFT和RIGHT         *         * 如果选择LEFT，从指定位置开始，往右绘制文字。即：文字从指定绘制位置起始位置开始，左对齐         * 如果选择RIGHT，从指定位置开始，往左绘制文字。即：文字从指定绘制位置起始位置开始，右对齐         * 如果选择CENTER，从指定位置开始，往左右两边绘制文字。即：文字从指定绘制位置起始位置开始，文字中间对齐         */        textPaint.setTextAlign(Paint.Align.CENTER);        textPaint.setColor(Color.BLACK);        textPaint_1 = new TextPaint(textPaint);        textPaint_1.setTypeface(Typeface.DEFAULT);        textPaint_2 = new TextPaint(textPaint);        textPaint_2.setTypeface(Typeface.DEFAULT_BOLD);        textPaint_3 = new TextPaint(textPaint);        //The NORMAL style of the default sans serif typeface        textPaint_3.setTypeface(Typeface.SANS_SERIF);        // The NORMAL style of the default serif typeface        textPaint_4 = new TextPaint(textPaint);        textPaint_4.setTypeface(Typeface.SERIF);        //The NORMAL style of the default monospace typeface        textPaint_5 = new TextPaint(textPaint);        textPaint_5.setTypeface(Typeface.MONOSPACE);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        baseX = w / 2;        baseY = h / 2;    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        /*         * @param text  The text to be drawn         * @param x     The x-coordinate of the origin of the text being drawn         * @param y     The y-coordinate of the baseline of the text being drawn         * @param paint The paint used for the text (e.g. color, size, style)         */        canvas.drawText(TEXT, baseX, baseY / 6, textPaint);        canvas.drawText(TEXT_1, baseX, baseY / 3, textPaint_1);        canvas.drawText(TEXT_2, baseX, baseY / 2, textPaint_2);        canvas.drawText(TEXT_3, baseX, baseY / 3 * 2, textPaint_3);        canvas.drawText(TEXT_4, baseX, baseY / 6 * 5, textPaint_4);        canvas.drawText(TEXT_5, baseX, baseY, textPaint_5);    }}

布局代码中使用：

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    >    <com.chen.view.FontView        android:layout_width="match_parent"        android:layout_height="match_parent"/></LinearLayout>