在我的应用程序中我需要在画布上显示图像我尝试使用下面的代码它工作好一些。但如果再次播放相同的页面我得到位图大小超出内存异常。我在网上冲浪，我设置样本大小，那个时间也变得异常请任何人帮我这么多天在病房里我遇到了这个问题。
Lines.class
public class Lines extends Activity
{
BitmapDrawable sounddrawable,erasedrawable,backdrwable,fwddrwable,captiondrwable,img1drwable;
Bitmap img1bitmap,soundbitmap,eraseBitmap,backbitmap,fwdbitmap,captionbitmap;
Bitmap bitmapOrg1,bitmapOrg2,bitmapOrg3,bitmapOrg4,bitmapOrg5,bitmapOrg6,bitmapOrg;
MyView myview;
View content;
float screenHeight,screenWidth,screendensity;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setNoTitle();
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
screenHeight = displaymetrics.heightPixels;
screenWidth = displaymetrics.widthPixels;
screendensity = displaymetrics.densityDpi;
Log.i("screenHeight",""+screenHeight);
Log.i("screenWidth",""+screenWidth);
Log.i("screendensity",""+screendensity);
setContentView(R.layout.line);
widtho=(int)(91*(screenWidth/1024));
highto=(int)(175*(screenHeight/600));
bitmapOrg = Bitmap.createScaledBitmap(bitmapOrg, widtho, highto, true);
leftorg=(int)(120*(screenWidth/1024));
toporg=(int)(130*(screenHeight/600));
bitmapOrg1 = BitmapFactory.decodeResource(getResources(),
R.drawable.line1_2);
width1=(int)(90*(screenWidth/1024));
hight1=(int)(175*(screenHeight/600));
bitmapOrg1 = Bitmap.createScaledBitmap(bitmapOrg1, width1, hight1, true);
leftorg1=(int)(300*(screenWidth/1024));
toporg1=(int)(130*(screenHeight/600));
bitmapOrg2 = BitmapFactory.decodeResource(getResources(),
R.drawable.line1_3);
bitmapOrg2 = Bitmap.createScaledBitmap(bitmapOrg2, widtho, highto, true);
leftorg2=(int)(470*(screenWidth/1024));
toporg2=(int)(130*(screenHeight/600));
bitmapOrg3 = BitmapFactory.decodeResource(getResources(),
R.drawable.line1_4);
bitmapOrg3 = Bitmap.createScaledBitmap(bitmapOrg3, width1, hight1, true);
leftorg3=(int)(640*(screenWidth/1024));
toporg3=(int)(130*(screenHeight/600));
bitmapOrg4 = BitmapFactory.decodeResource(getResources(),
R.drawable.line1_5);
bitmapOrg4 = Bitmap.createScaledBitmap(bitmapOrg4, width1, hight1, true);
leftorg4=(int)(810*(screenWidth/1024));
toporg4=(int)(130*(screenHeight/600));
bitmapOrg5 = BitmapFactory.decodeResource(getResources(),
R.drawable.line1_6);
width6=(int)(237*(screenWidth/1024));
hight6=(int)(139*(screenHeight/600));
bitmapOrg5 = Bitmap.createScaledBitmap(bitmapOrg5, width6, hight6, true);
leftorg5=(int)(150*(screenWidth/1024));
toporg5=(int)(370*(screenHeight/600));
bitmapOrg6 = BitmapFactory.decodeResource(getResources(),
R.drawable.line1_7);
bitmapOrg6 = Bitmap.createScaledBitmap(bitmapOrg6, width6, hight6, true);
leftorg6=(int)(600*(screenWidth/1024));
toporg6=(int)(370*(screenHeight/600));
}
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(6);
}
private void setNoTitle() {
// TODO Auto-generated method stub
requestWindowFeature(Window.FEATURE_NO_TITLE);
}
private Paint mPaint;
private Bitmap mBitmap;
public void colorChanged(int color) {
mPaint.setColor(color);
}
public class MyView extends View
{
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
public MyView(Context context) {
super(context);
// TODO Auto-generated constructor stub
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (mBitmap != null) {
mBitmap.recycle();
mBitmap=null;
}
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mCanvas.setBitmap(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
if(action)
{
invalidate();
}
Paint painto = new Paint();
painto.setAntiAlias(true);
painto.setColor(getResources().getColor(R.color.magnata));
painto.setStrokeWidth(3);
painto.setStyle(Paint.Style.FILL);
bitmapOrg.recycle();
canvas.drawBitmap(bitmapOrg, leftorg, toporg, null);
bitmapOrg1.recycle();
canvas.drawBitmap(bitmapOrg1, leftorg1,toporg1, null);
bitmapOrg2.recycle();
canvas.drawBitmap(bitmapOrg2, leftorg2,toporg2, null);
bitmapOrg3.recycle();
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawBitmap(bitmapOrg3, leftorg3,toporg3, null);
bitmapOrg4.recycle();
canvas.drawBitmap(bitmapOrg4, leftorg4,toporg4, null);
bitmapOrg6.recycle();
canvas.drawBitmap(bitmapOrg6, leftorg6,toporg6, null);
bitmapOrg5.recycle();
canvas.drawBitmap(bitmapOrg5, leftorg5,toporg5, null);
canvas.drawPath(mPath, mPaint);
}
private float mX, mY;
private float TOUCH_TOLERANCE = 2;
private void touch_start(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
}
}
private void touch_up() {
mPath.lineTo(mX, mY);
mCanvas.drawPath(mPath, mPaint);
mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
}
return true;
}
}
答案 0 :(得分：-1)
我不确定你为什么会收到OutOfMemory错误（因为你没有发布堆栈跟踪，我猜这不是你得到的实际错误）。
您对Bitmap.recycle（）的使用很可能是问题所在。它仅用于在丢弃位图时使用，并且永远不会再次引用它。在任何情况下，您实际上都没有必要调用它，它只会导致早期清理本地内存，这些内存将在Bitmap最终确定时释放。
文档说：
释放与此位图关联的本机对象，然后清除 参考像素数据。这不会释放像素数据 同步;它只是允许它被垃圾收集，如果有的话 没有其他参考。位图标记为“死”，意思是它 如果调用getPixels（）或setPixels（），则会抛出异常 什么都不会。这个操作无法逆转，所以应该如此 只有在你确定没有进一步的用途时才被调用 位图。这是一个高级调用，通常不需要调用， 因为正常的GC过程会在没有时释放这个内存 更多对此位图的引用。
所以，你绝对不应该在onDraw中调用它，并且在你尝试将位图绘制到画布之前肯定不会。我的建议是删除所有对recycle（）的调用。