[英]How to draw a bitmap on a canvas on the whole screen?
在我的應用程序中,我需要在整個屏幕上繪制一個位圖。 由於某些原因,當我繪制位圖時,只有一部分位圖正在加載在屏幕的一部分上。 換句話說,不是整個圖片都顯示在屏幕上。 這是我繪制位圖的一部分代碼:
byte[]byteArray=getIntent().getByteArrayExtra("image");
Bitmap tmp=BitmapFactory.decodeByteArray(byteArray,0,byteArray.length);
operation = Bitmap.createBitmap(tmp.getWidth(), tmp.getHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(operation);
Paint paint = new Paint();
tmp.setDensity(c.getDensity());
c.drawBitmap(tmp, 0f, 0f, paint);
tmp.recycle();
和:
private void drawOverlays() {
Canvas c = null;
try {
c = holder.lockCanvas(null);
synchronized (holder) {
if (c != null)
c.drawBitmap(operation, 0, 0, null);
}
} catch (Exception e) {
Log.e("SurfaceView", "Error drawing frame", e);
} finally {
// do this in a finally so that if an exception is thrown
// during the above, we don't leave the Surface in an
// inconsistent state
if (c != null) {
holder.unlockCanvasAndPost(c);
}
}
}
為此,您需要獲取設備的寬度和高度,然后將圖像縮放到該尺寸並將其顯示在畫布上。
這是您的代碼的修改。
//add this code before your code
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;
//your code with modification
byte[]byteArray=getIntent().getByteArrayExtra("image");
Bitmap tmp=BitmapFactory.decodeByteArray(byteArray,0,byteArray.length);
operation = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(operation);
Paint paint = new Paint();
tmp.setDensity(c.getDensity());
c.drawBitmap(tmp, 0f, 0f, paint);
tmp.recycle();
現在它將填滿整個屏幕,確保將畫布應用到整個屏幕。
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