android 通过canvas旋转 绘制文字 竖直等不同方向的显示

效果如下：

主体代码如下：

 

 
  package com.free.chart; 
  
 
  
 
  import android.content.Context; 
  
 
  import android.graphics.Canvas; 
  
 
  import android.graphics.Color; 
  
 
  import android.graphics.Paint; 
  
 
  import android.view.SurfaceHolder; 
  
 
  import android.view.SurfaceView; 
  
 
  
 
  public  
  class DrawTextStudy  
  extends SurfaceView  
  implements SurfaceHolder.Callback { 
  
 
  
    SurfaceHolder holder; 
  
     
  public DrawTextStudy(Context context) { 
  
         
  super(context); 
  
         
  // 
   TODO Auto-generated constructor stub 
  
        holder =  
  this.getHolder(); 
  
        holder.addCallback( 
  this); 
  
    } 
  
 
  
    @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 
  
         
  new Thread( 
  new MyThread()).start(); 
  
    } 
  
 
  
    @Override 
  
     
  public  
  void surfaceDestroyed(SurfaceHolder holder) { 
  
         
  // 
   TODO Auto-generated method stub 
  
         
  
    } 
  
     
  
     
  void drawText(Canvas canvas ,String text ,  
  float x , 
  float y,Paint paint , 
  float angle){ 
  
         
  if(angle != 0){ 
  
            canvas.rotate(angle, x, y);  
  
        } 
  
        canvas.drawText(text, x, y, paint); 
  
         
  if(angle != 0){ 
  
            canvas.rotate(-angle, x, y);  
  
        } 
  
    } 
  
     
  
     
  class MyThread  
  implements Runnable{ 
  
 
  
        @Override 
  
         
  public  
  void run() { 
  
             
  // 
   TODO Auto-generated method stub 
  
            Canvas canvas =  
  null;     
  
             
  try{                         
  
                canvas = holder.lockCanvas(); 
  
                Paint paint =  
  new Paint();                 
  
                paint.setColor(Color.WHITE); 
  
                paint.setTextSize(20);                 
  
                canvas.drawLine(100, 100, 100, 400, paint); 
  
                drawText(canvas,"Hello", 80, 200, paint,-90);         
  
                 
  
                paint.setColor(Color.RED); 
  
                paint.setTextSize(40); 
  
                drawText(canvas,"free", 150, 180, paint,-45);         
  
                 
  
                paint.setColor(Color.BLUE); 
  
                drawText(canvas,"World", 150, 80, paint,0); 
  
                canvas.drawLine(100, 100, 400, 100, paint); 
  
                 
  
            }  
  catch(Exception e){ 
  
                 
  
            }  
  finally { 
  
                holder.unlockCanvasAndPost(canvas); 
  
            }         
  
             
  
        }         
  
    } 
  
     
  
 
  
} 
 

 

activity调用

 

        
  public  
  void onCreate(Bundle savedInstanceState) { 
  
         
  super.onCreate(savedInstanceState); 
  
         
  
        setContentView( 
  new DrawTextStudy( 
  this)); 
  
}