实例5--自动换行(修订版)

这个实例主要是运用字体的只是，但是android自带就几种，虽然android有提供可以自己加载字体的功能，但我试了下，没发现成功的，所以我代码里面就没有弄了，就弄了自带的。明天再试试效果，发现书本的代码不怎么适合android，当字体变大时，会出现按两次才能换行的bug。已经修改了.

下面是效果图：

实例5--自动换行(修订版)_第1张图片

实例5--自动换行(修订版)_第2张图片

mainView的代码:

package com.wjh.demon_5;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Typeface;import android.view.KeyEvent;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.SurfaceHolder.Callback;public class MainView extends SurfaceView implements Callback,Runnable{Thread gameThread = null;boolean isGame = true;SurfaceHolder holder = null;Paint forePaint = null;Paint backPaint = null;int keyCode = -1;boolean isKeyDown = false;public intm_nWidth = 50;//显示宽度public Typeface m_nTypeFace = null;//存储字体public MainView(Context context) {super(context);// TODO Auto-generated constructor stubsetFocusable(true);getHolder().addCallback(this);holder = this.getHolder();backPaint = new Paint();backPaint.setColor(Color.BLACK);forePaint = new Paint();forePaint.setTypeface(Typeface.DEFAULT_BOLD);forePaint.setTextSize(20);forePaint.setColor(Color.RED);}@Overridepublic void run() {// TODO Auto-generated method stubwhile(isGame){input();logic();doDraw();try {Thread.sleep(100);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}//开始游戏主线程public void start(){if(gameThread == null){gameThread = new Thread(this);gameThread.start();}}//停止游戏主线程public void stop(){isGame = false;if(gameThread != null){try {gameThread.join();} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}//输入判断public void input(){if( keyCode == KeyEvent.KEYCODE_DPAD_UP && isKeyDown){m_nWidth = m_nWidth +(int)forePaint.getTextSize(); isKeyDown = false;}//如果按下方向键的下键，则调整当前行的位置else if(keyCode == KeyEvent.KEYCODE_DPAD_DOWN && isKeyDown){m_nWidth = m_nWidth - (int)forePaint.getTextSize();isKeyDown = false;}}//逻辑判断public void logic(){}public void doDraw(){Canvas c = null;try{c = holder.lockCanvas();synchronized (holder) {paint(c);}}finally{if(c != null){holder.unlockCanvasAndPost(c);}}}//画图public void paint(Canvas canvas){//清贫canvas.drawRect(0, 0, getWidth(), getHeight(),backPaint);TextAjust.AjustDrawString(canvas,forePaint,"我要自动换行我要自动换行我要自动换行我要自动换行",m_nWidth, 50, 50, 30 );}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubstart();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stubstop();}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stub//如果按下方向键的上键，则调整当前行的位置this.keyCode = keyCode;isKeyDown = true;return true;}}

书上提供的换行功能源码，我把画图的改成android的,其他的没改，但代码效果不好

下面给出代码

TextAjust.java

package com.wjh.demon_5;import android.graphics.Canvas;import android.graphics.Paint;public class TextAjust {static public int ChangLine(String str, Paint paint, int linewd ){ int wd = 0;char ch;for (int i = 0; i < str.length(); i++) { ch = str.charAt(i);if (ch == '\n')return i + 1; wd += paint.getTextSize();if (wd > linewd)return i;}return 0;}static public void AjustDrawString(Canvas canvas,Paint paint, String strText, int linewd, int x, int y, int yDis ){String subStr;int nPos; //需要换行的位置while (true){//获得句子的断点位置nPos = ChangLine(strText, paint, linewd );if (nPos == 0){//如果nPos为0，代表输入的字符串为空canvas.drawText( strText, x, y,paint);break;}else{//判断是否最后一句if (strText.charAt(nPos - 1) == '\n' )subStr = strText.substring(0, nPos - 1);elsesubStr = strText.substring(0, nPos);canvas.drawText( subStr, x, y, paint);//截断句子，继续进行处理strText = strText.substring(nPos, strText.length());y = y + yDis;}}}}

apk文件（将后缀改为apk）：Demon_5.zip

源代码文件:Demon_5.rar

Demon_5.zip (15.2 KB)
下载次数: 1

Demon_5.rar (45.7 KB)
下载次数: 8

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