在畫布上繪圖ANDROID

我有一個24端口的交換機。我想畫在畫布上。我設法做到了這一點，但問題是，當我改變一個端口的狀態時，我不得不再次繪製它們，但沒有發生。這裏是我的課：

PortTemplate：

public class PortTemplate{ 

private Rect port = new Rect(); 
private PointerCoords insertPoint=new PointerCoords(); 
private float xCoord; 
private float yCoord; 
private float gap; 

... 

//DRAWING PORT 
public Rect drawPort(){ 
    port.set((int)insertPoint.x, (int)insertPoint.y, (int)insertPoint.x+portWidth, (int)insertPoint.y+portHeight); 
    return port; 
} 
//********** 
... 
//setters and getters

MainActivity

public class MainActivity extends Activity implements OnClickListener{ 
Rect rec = new Rect(); 
int numberPorts=24; 
PortTemplate[] recs=new PortTemplate[numberPorts]; 
PortTemplate[] newRecs=new PortTemplate[numberPorts]; 
Canvas canvas; 
... 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    port = (TextView) findViewById(R.id.port); 

    mSelect = (Button) findViewById(R.id.select); 
    mOptions = (Button) findViewById(R.id.option); 

    mSelect.setOnClickListener(this); 
    mOptions.setOnClickListener(this); 

    surface= (SurfaceView) findViewById(R.id.surface); 
    surface.setBackgroundColor(Color.TRANSPARENT); 
    surface.getHolder().addCallback(new Callback() { 

     @Override 
     public void surfaceCreated(SurfaceHolder holder) { 
      // Do some drawing when surface is ready 

      PointerCoords insertRec=new PointerCoords(); 
      float x = insertRec.x=36; 
      float y = insertRec.y=22; 
      for(int i=0; i<numberPorts; i++) 
      { 
       recs[i]=new PortTemplate(); 
       recs[i].setInsertPoint(x,y); 
       recs[i].setPortHeight(21); 
       recs[i].setPortWidth(23); 
       recs[i].setPortNumber(i+1); 

       newRecs[i]=new PortTemplate(); 
       newRecs[i].setInsertPoint(x,y); 
       newRecs[i].setPortHeight(21); 
       newRecs[i].setPortWidth(23); 
       newRecs[i].setPortNumber(i+1); 

       x+=26.3; 
      } 

      Bitmap eqImage = BitmapFactory.decodeResource(getResources(), R.drawable.ports); 
      Bitmap newImage = Bitmap.createScaledBitmap(eqImage, 700, 60, true);  
      canvas = holder.lockCanvas(); 
      canvas.drawBitmap(newImage, new Matrix(), null); 
      EquipmentTemplate newEqup = new EquipmentTemplate(); 
      newEqup.setHeight(200); 
      newEqup.setWidth(650); 
      newEqup.setxCoord(0); 
      newEqup.setyCoord(0); 

      for(int i=0; i<numberPorts; i++) 
      { 
       canvas.drawRect(recs[i].drawPort(), recs[i].getPaint()); 
      } 

      canvas.drawColor(Color.TRANSPARENT); 
      holder.unlockCanvasAndPost(canvas); 
     } 

     @Override 
     public void surfaceDestroyed(SurfaceHolder holder) { 
     } 

     @Override 
     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 
     } 
    }); 


} 
...

而且在MainActivity我有方法，將允許用戶更改所選端口的狀態，將裏面的狀態：

private void selectPortDialog() 
{ 
    String[] portsWithNumbers = new String[numberPorts]; 

    for(int i=0; i<numberPorts; i++) 
    { 
     portsWithNumbers[i]="Port: "+recs[i].getPortNumber(); 
    } 


    AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); 
    dialogBuilder.setTitle("Select Port"); 
    dialogBuilder.setSingleChoiceItems(portsWithNumbers, -1, new DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      selected = recs[which].getPortNumber(); 

     } 
    }); 
    dialogBuilder.setPositiveButton("Select", new DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      // TODO Auto-generated method stub 
      Toast.makeText(getApplicationContext(), "Selected port: "+selected, Toast.LENGTH_LONG).show(); 
      port.setText("Port "+selected); 
     } 
    }); 
    AlertDialog alertDialog = dialogBuilder.create(); 
    alertDialog.show(); 

} 



private void selectOptions() 
{ 
    final String[] options = new String[3]; 

    if(recs[selected-1].isConnected()==false && recs[selected-1].getReserved()==false && recs[selected-1].getDefect()==false) 
    { 
     options[0]="Connect"; 
     options[1]="Reserve"; 
     options[2]="Defect"; 

     AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); 
     dialogBuilder.setTitle("Action"); 
     dialogBuilder.setSingleChoiceItems(options, -1, new DialogInterface.OnClickListener() { 

      @Override 
      public void onClick(DialogInterface dialog, int which) { 
       if(which==0) 
       { 
        newRecs[selected-1].setConnected(true); 
        refresh(); 
       } 

      } 
     }); 
     AlertDialog alertDialog = dialogBuilder.create(); 
     alertDialog.show(); 

    } 
} 

public void refresh() 
{ 
    surface.getHolder().addCallback(new Callback() { 

     @Override 
     public void surfaceCreated(SurfaceHolder holder) { 
      // Do some drawing when surface is ready 

      canvas = holder.lockCanvas(); 

      for(int i=0; i<numberPorts; i++) 
      { 
       canvas.drawRect(newRecs[i].drawPort(), newRecs[i].getPaint()); 
      } 

      canvas.drawColor(Color.TRANSPARENT); 
      holder.unlockCanvasAndPost(canvas); 
     } 

     @Override 
     public void surfaceDestroyed(SurfaceHolder holder) { 
     } 

     @Override 
     public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { 
     } 
    }); 

}

問題是： t當他們選擇狀態時，畫布不繪製端口（刷新方法）。任何想法如何讓畫布畫出現有端口上的端口？

預先感謝您！

來源

2013-10-14 chikito1990

一對夫婦的事情...

你在做surfaceCreated繪圖首次創建表面時，它纔會被調用，所以不會有這種方法的任何後續調用。
你真的應該在你的情況下創建一個自定義View。只需擴展View並在onDraw中進行繪圖。您還可以訪問諸如invalidate()等方法，這些方法將重新繪製您的View。

來源

2013-10-14 13:09:55

在畫布上繪圖ANDROID

回答

相關問題