实例5--自动换行(修订版)

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android

Android 游戏 C C++C#

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：

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 int	m_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 stub
		setFocusable(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);
		
		
	
		
	}
	@Override
	public void run() {
		// TODO Auto-generated method stub
		while(isGame)
		{
			input();
			logic();
			doDraw();
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.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 block
				e.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 );
		
		
	}
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		// TODO Auto-generated method stub
		
	}
	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		// TODO Auto-generated method stub
		start();
		
	}
	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		// TODO Auto-generated method stub
		stop();
		
	}
	@Override
	public 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);
				else
					subStr = 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