问题描述
我在onCreate中以编程方式创建布局:
I create the Layout programatically in onCreate:
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
myView = new MyView(SketchActivity.this, layout.getWidth(), layout.getHeight());
layout2.addView(myView);
layout2.bringToFront();
}
}, 50);
我在其中创建(可变?)位图的视图:
The View where i create the (mutable?) bitmap:
public MyView(Context c, int width, int height) {
super(c);
WindowManager wm = (WindowManager) c.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
int w = display.getWidth(); // deprecated
int h = display.getHeight();
setFocusable(true);
setBackgroundResource(R.drawable.download);
// setting paint
mPaint = new Paint();
mPaint.setAlpha(0);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
mPaint.setAntiAlias(true);
// getting image from resources
Resources r = this.getContext().getResources();
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.smoke);
// converting image bitmap into mutable bitmap
bitmap = bm.createBitmap(w, h, Config.ARGB_8888);
mCanvas = new Canvas();
mCanvas.setBitmap(bitmap); // drawXY will result on that Bitmap
mCanvas.drawBitmap(bm, 0, 0, null);
}
我的onDraw函数:
My onDraw function:
@Override
protected void onDraw(Canvas canvas) {
mCanvas.drawCircle(x, y, r, mPaint);
canvas.drawBitmap(bitmap, 0, 0, null);
super.onDraw(canvas);
}
OnTouchEvent:
OnTouchEvent:
@Override
public boolean onTouchEvent(MotionEvent event) {
x = (int) event.getX();
y = (int) event.getY();
r = 20;
// Atlast invalidate canvas
invalidate();
return true;
}
没有LogCat错误问题出在myView中.当我创建位图时,位图= bm.createBitmap(w,h,Config.ARGB_8888);如果我代替w,h(屏幕的宽度和高度)放一个小数字,例如:bitmap = bm.createBitmap(20,20,Config.ARGB_8888);它创建了一张小图片.但是,如果我将w和h放进去,则不会在所有布局上绘制,它只会绘制一小部分. (即使我尝试:bitmap = bm.createBitmap(800,1080,Config.ARGB_8888);它仍然只占一小部分而不是全部屏幕.我该怎么办?
No LogCat ErrorsThe problem is in myView. when i create the bitmap bitmap = bm.createBitmap(w, h, Config.ARGB_8888); If i put instead of w,h(width and height of screen) a small number Example: bitmap = bm.createBitmap(20, 20, Config.ARGB_8888); it creates a tiny picture. But if I put w and h, then instead of drawing on all the layout, it only draws on a small part. (even if i try: bitmap = bm.createBitmap(800, 1080, Config.ARGB_8888); it still draws on a small part, instead of all the screen. What should i do?
推荐答案
此问题已解决:
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// CREATE A MATRIX FOR THE MANIPULATION
Matrix matrix = new Matrix();
// RESIZE THE BIT MAP
matrix.postScale(scaleWidth, scaleHeight);
// RECREATE THE NEW BITMAP
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
public MyView(Context c, int width, int height) {
super(c);
WindowManager wm = (WindowManager) c.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
int w = display.getWidth(); // deprecated
int h = display.getHeight();
setFocusable(true);
setBackgroundResource(R.drawable.download);
// setting paint
mPaint = new Paint();
mPaint.setAlpha(0);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
mPaint.setAntiAlias(true);
mPaint.setMaskFilter(new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL));
// getting image from resources
Resources r = this.getContext().getResources();
Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.smoke);
Bitmap bm2 = getResizedBitmap(bm, h, w);
// converting image bitmap into mutable bitmap
bitmap = bm2.createBitmap(w, h, Config.ARGB_8888);
mCanvas = new Canvas();
mCanvas.setBitmap(bitmap); // drawXY will result on that Bitmap
mCanvas.drawBitmap(bm2, 0, 0, null);
}
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