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我正在嘗試製作一個非常簡單的遊戲。用戶必須嘗試用手指移動籃子來捕捉蘋果。 一切似乎工作得很好，但我有一個問題：我想繪製應用程序的背景。但是使用圖像作爲backgorund會使應用程序非常慢，並導致很多延遲。如果我使用白色背景，我沒有任何問題。繪製背景使我的應用變得緩慢
有人可以告訴我我做錯了什麼嗎？
我認爲這是因爲我每次更新應用程序時會繪製背景，但我不知道有任何方法可以改變這一點。
也許我的代碼有點混亂，我還在學習。
感謝您的幫助！
package com.cris9696.mela;
import java.util.Random;
import com.cris9696.mela.R;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.Paint.Align;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;
public class Game extends Activity implements OnTouchListener {
ClasseCanvas View;
float xApple, yApple, xBasket, yBasket;
Bitmap Apple, Basket, BackG;
Random rnd = new Random();
int win = 0, score = 0, level = 1;
int record = 0;
Typeface Font;
Paint TextP = new Paint();
Rect dest;
Paint paint;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Font = Typeface.createFromAsset(getAssets(), "TF2.ttf");
View = new ClasseCanvas(this);
View.setOnTouchListener(this);
TextP.setColor(Color.RED);
TextP.setTextSize(50);
TextP.setTypeface(Font);
xApple = yApple = xBasket = yBasket = 0;
xApple = rnd.nextInt(600);
Apple = BitmapFactory.decodeResource(getResources(), R.drawable.apple);
BackG = BitmapFactory
.decodeResource(getResources(), R.drawable.bg);
Basket = BitmapFactory.decodeResource(getResources(),
R.drawable.basket);
setContentView(View);
}
// /////////////////////////////////////////////////////////////////////////////
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
xBasket = event.getX();
yBasket = event.getY();
/*
* switch (event.getAction()) { // ci dice cosa succede
*
* case MotionEvent.ACTION_DOWN:
*
* case MotionEvent.ACTION_UP:
*
* break; }
*/
return true;
}
// ///////////////////////////////////////////////////////////////////////////
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
View.pause();
}
// /////////////////////////////////////////////////////////////////////////////
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
View.resume();
}
// ///////////////////////////////////////////////////////////
public class ClasseCanvas extends SurfaceView implements Runnable {
SurfaceHolder Holder;
Thread thread = null;
boolean isRunning = true;
public ClasseCanvas(Context context) {
super(context);
Holder = getHolder();
// TODO Auto-generated constructor stub
}
@Override
public void run() {
// TODO Auto-generated method stub
while (isRunning) {
if (!Holder.getSurface().isValid())
continue;
Canvas canvas = Holder.lockCanvas();
dest = new Rect(0, 0, getWidth(), getHeight());
paint = new Paint();
paint.setFilterBitmap(true);
canvas.drawBitmap(BackG, null, dest, paint);
TextP.setColor(Color.RED);
canvas.drawText(Integer.toString(score), 56, 56, TextP);
TextP.setColor(Color.BLACK);
canvas.drawText("Level " + Integer.toString(level), 115,
56, TextP);
if (xBasket != 0 && yBasket != 0) {
canvas.drawBitmap(Basket, xBasket - Basket.getWidth()/2,
yBasket - Basket.getHeight()/2, null);
}
canvas.drawBitmap(Apple, xApple, yApple, null);
if (yApple < canvas.getHeight())
if (score >= 0)
yApple += 5 * level;
else
yApple += 5;
else {
yApple = 0;
score--;
xApple = rnd.nextInt(canvas.getWidth() - Apple.getWidth());
}
if (score > record)
record = score;
if (score == 10) {
level++;
score = 0;
}
if ((xApple >= xBasket - (Basket.getWidth()/2)
&& xApple + (Apple.getWidth()) <= xBasket
+ (Basket.getWidth()/2) && yApple >= yBasket && yApple <= yBasket
+ Basket.getHeight())
|| (xApple >= xBasket - (Basket.getWidth()/2)
&& xApple <= xBasket + (Basket.getWidth()/2)
&& yApple >= yBasket && yApple <= yBasket
+ Basket.getHeight())
|| (xApple + (Apple.getWidth()) >= xBasket
- (Basket.getWidth()/2)
&& xApple + (Apple.getWidth()) <= xBasket
+ (Basket.getWidth()/2)
&& yApple >= yBasket && yApple <= yBasket
+ Basket.getHeight())) {
win = 1;
xApple = rnd.nextInt(canvas.getWidth());
yApple = 0;
score++;
}
Holder.unlockCanvasAndPost(canvas);
}
}
public void pause() {
isRunning = false;
while (true) {
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
break;
}
thread = null;
// TODO Auto-generated method stub
}
public void resume() {
// TODO Auto-generated method stub
isRunning = true;
thread = new Thread(this);
thread.start();
}
}
}
這是我的新xml佈局。 http://pastebin.com/cksKMjDy 它錯了嗎？ – 2013-02-18 15:53:05
看看我的編輯。如果它解決了，不要忘記接受答案！ – wdziemia 2013-02-18 20:30:58