timertask不起作用！

Question

我已經嘗試使用timertask刷新用固定點座標繪製的線（每1秒後）。但該行似乎沒有刷新......我的代碼中是否有任何錯誤？

LineRefresh.java：

package LineRefresh.xyz.com; 
import android.app.Activity; 
import android.graphics.Color; 
import android.os.Bundle; 

public class LineRefresh extends Activity { 
DrawView drawView; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    drawView = new DrawView(this); 
    drawView.setBackgroundColor(Color.WHITE); 
    setContentView(drawView); 

} 
} 

DrawView.java：

package LineRefresh.xyz.com; 
import java.util.Timer; 
import java.util.TimerTask; 
import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.view.View; 

public class DrawView extends View { 
Paint paint = new Paint(); 

public DrawView(Context context) { 
    super(context);  
} 

@Override 
public void onDraw(final Canvas canvas) { 
    paint.setColor(Color.BLACK); 
    canvas.drawLine(50, 200, 270, 200, paint); 

    Timer timer = new Timer(); 
    TimerTask task = new TimerTask() { 
     @Override 
     public void run() { 
      paint.setColor(Color.BLACK); 
      canvas.drawLine(50, 200, 270, 200, paint); 
      } 
    }; 
    timer.schedule(task, 1000,1000); 
} 

} 

sholud我，相反，將TimerTask的其他地方在我的代碼？

Answer 1

寧可使用Android處理程序在特定時間後更新UI。