protected void onDraw(Canvas canvas) {

//사각형 그리기

Paint pnt = new Paint();

pnt.setStrokeWidth(3);                //선굵기

pnt.setStyle(Paint.Style.STROKE);  //외곽선만

pnt.setARGB(255, 255, 255, 255);

canvas.drawRect(0,0,50,50,pnt);

}

타이틀바 제거

<< Code >>

    requestWindowFeature(Window.FEATURE_NO_TITLE);

 or

<< layout.xml >>

android:theme="@android:style/Theme.NoTitleBar"

가로, 세로 화면 방향 설정

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 

OutOfMemoryError bitmap size exceeds VM budget 메모리 에러

Memory Management For Android.

Recycle Bitmap

액티비티가 destroy될 때 해제. 안하고 놔두면 뻗는다.

protected void onDestroy(){

bitmap.recycle();

bitmap = null;

}

Recycle ImageView's Bitmap

((BitmapDrawable)picView.getDrawable()).getBitmap().recycle();