提高速度以重新绘制Android屏幕

Question

我是安卓系统的新手。我的应用程序需要一次又一次地重新绘制一个画布圆圈。然而，重绘的速度比我想要的要慢。我怎样才能增加同样的金额。

我的代码如下：

-->ImagePracActivity.java

package com.pkg.ImagPrac;
  import android.app.Activity;
  import android.os.Bundle;
  import android.view.Window;
  import android.view.WindowManager;
   public class ImagePracActivity extends Activity {
      //DrawView drawView;
        movement mv;
   @Override
     public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Set full screen view
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                                         WindowManager.LayoutParams.FLAG_FULLSCREEN);
        requestWindowFeature(Window.FEATURE_NO_TITLE);    
        mv=new movement(getApplicationContext());            
        setContentView(mv);            
        mv.requestFocus();            
      }
   }

-->movement.java

package com.pkg.ImagPrac;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.WindowManager;
public class movement extends View implements OnTouchListener{    
    Display display;
    float x=0,y=0;
    Paint paint=new Paint();
    private boolean flag;
    public movement(Context context) {
        super(context);         
        setFocusable(true);
        setFocusableInTouchMode(true);    
        this.setOnTouchListener(this);
        paint.setColor(Color.BLUE);
        paint.setAntiAlias(true);
        display = ((WindowManager)   
        context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
        x = 0;
        y = display.getHeight();            
    }
      @Override
         protected void onDraw(Canvas canvas) {             
           if(x<(display.getWidth()/2))
        {
          canvas.drawCircle(x++, y--, 5, paint);
        }           
          else if(x<(display.getWidth()))
        {
          canvas.drawCircle(x++, y++, 5, paint);
        }       
        this.invalidate();
    }    
          public boolean onTouch(View arg0, MotionEvent arg1) {
        // TODO Auto-generated method stub
        return false;
    }    
}

Answer 1

A建议您使用SurfaceView类而不是View，因为SurfaceView更快，并且允许您在单独的线程中拥有所有绘图逻辑。阅读有关SurfaceView的更多信息：http://developer.android.com/guide/topics/graphics/2d-graphics.html

Answer 2

尝试这个

 mPaint = new Paint();
 mPaint.setAntiAlias(true);
 mPaint.setDither(true);
 mPaint.setColor(Color.BLUE);
 mPaint.setStyle(Paint.Style.STROKE);
 mPaint.setStrokeJoin(Paint.Join.ROUND);
 mPaint.setStrokeCap(Paint.Cap.ROUND);
 mPaint.setStrokeWidth(5);