Android line feed

This example mainly uses the font, but android comes with only a few types. Although android provides the font reprinting function, I tried it and did not find it successful, so I didn't get it in the code, so I got it. Try again tomorrow and find that the book code is not very suitable for android. When the font size increases, there will be a bug that only two lines can be entered. I will revise this bug later

Below is:

MainView code:

Java code

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; // display width
Public Typeface m_nTypeFace = null; // store the font
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 ();
}
}

}
// Start the main game thread
Public void start ()
{
If (gameThread = null)
{
GameThread = new Thread (this );
GameThread. start ();
}
}
// Stop the main game thread
Public void stop ()
{
IsGame = false;
If (gameThread! = Null)
{
Try {
GameThread. join ();
} Catch (InterruptedException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
}
}
// Input judgment
Public void input ()
{
If (keyCode = KeyEvent. KEYCODE_DPAD_UP & isKeyDown)
{
M_nWidth = m_nWidth + 10;
IsKeyDown = false;
}
// Adjust the position of the current row if you press the arrow key.
Else if (keyCode = KeyEvent. KEYCODE_DPAD_DOWN & isKeyDown)
{
M_nWidth = m_nWidth-10;
IsKeyDown = false;
}

}
// Logical judgment
Public void logic ()
{

}
Public void doDraw ()
{
Canvas c = null;
Try
{
C = holder. lockCanvas ();
Synchronized (holder ){
Paint (c );
}
} Finally {
If (c! = Null)
{
Holder. unlockCanvasAndPost (c );
}
}
}
// Draw
Public void paint (Canvas canvas)
{
// Poverty alleviation
Canvas. drawRect (0, 0, getWidth (), getHeight (), backPaint );

TextAjust. AjustDrawString (canvas, forePaint,
"I want to wrap automatically ",
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
// If you press the arrow key, adjust the position of the current row.
This. keyCode = keyCode;
IsKeyDown = true;

Return true;
}

}

The source code of the line feed function provided in the book, I changed the drawing to android, but nothing else was changed, but the Code did not work well.

The following code is provided:

TextAjust. java

Java code 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; // the position where the line feed is needed.
While (true)
{
// Obtain the breakpoint position of a sentence
NPos = ChangLine (strText, paint, linewd );
If (nPos = 0)
{
// If nPos is 0, the input string is null.
Canvas. drawText (strText, x, y, paint );
Break;
}
Else
{
// Determine whether the last sentence is used
If (strText. charAt (nPos-1) = '\ n ')
SubStr = strText. substring (0, nPos-1 );
Else
SubStr = strText. substring (0, nPos );
Canvas. drawText (subStr, x, y, paint );
// Cut the sentence and continue processing
StrText = strText. substring (nPos, strText. length ());
Y = y + yDis;
}
}
}
}