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내 안드로이드 응용 프로그램에서 ScrollImageView 클래스를 구현하는 :어떻게이 클래스를 발견
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
// borrowed from https://sites.google.com/site/androidhowto/how-to-1/custom-scrollable-image-view
public class ScrollImageView extends View {
private final int DEFAULT_PADDING = 10;
private Display mDisplay;
private Bitmap mImage;
/* Current x and y of the touch */
private float mCurrentX = 0;
private float mCurrentY = 0;
private float mTotalX = 0;
private float mTotalY = 0;
/* The touch distance change from the current touch */
private float mDeltaX = 0;
private float mDeltaY = 0;
int mDisplayWidth;
int mDisplayHeight;
int mPadding;
public ScrollImageView(Context context) {
super(context);
initScrollImageView(context);
}
public ScrollImageView(Context context, AttributeSet attributeSet) {
super(context);
initScrollImageView(context);
}
private void initScrollImageView(Context context) {
mDisplay = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
mPadding = DEFAULT_PADDING;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = measureDim(widthMeasureSpec, mDisplay.getWidth());
int height = measureDim(heightMeasureSpec, mDisplay.getHeight());
setMeasuredDimension(width, height);
}
private int measureDim(int measureSpec, int size) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
result = specSize;
} else {
result = size;
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
}
return result;
}
public Bitmap getImage() {
return mImage;
}
public void setImage(Bitmap image) {
mImage = image;
}
public int getPadding() {
return mPadding;
}
public void setPadding(int padding) {
this.mPadding = padding;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mCurrentX = event.getRawX();
mCurrentY = event.getRawY();
}
else if (event.getAction() == MotionEvent.ACTION_MOVE) {
float x = event.getRawX();
float y = event.getRawY();
// Update how much the touch moved
mDeltaX = x - mCurrentX;
mDeltaY = y - mCurrentY;
mCurrentX = x;
mCurrentY = y;
invalidate();
}
// Consume event
return true;
}
@Override
protected void onDraw(Canvas canvas) {
if (mImage == null) {
return;
}
float newTotalX = mTotalX + mDeltaX;
// Don't scroll off the left or right edges of the bitmap.
if (mPadding > newTotalX && newTotalX > getMeasuredWidth() - mImage.getWidth() - mPadding)
mTotalX += mDeltaX;
float newTotalY = mTotalY + mDeltaY;
// Don't scroll off the top or bottom edges of the bitmap.
if (mPadding > newTotalY && newTotalY > getMeasuredHeight() - mImage.getHeight() - mPadding)
mTotalY += mDeltaY;
Paint paint = new Paint();
canvas.drawBitmap(mImage, mTotalX, mTotalY, paint);
}
}
내 응용 프로그램과 함께 사용하는 방법을 난처한 상황에 빠진입니다.
세로 및 가로로 스크롤 할 수있는 비트 맵 이미지를 표시하려면 가로 방향으로 놓을 때 내 응용 프로그램을 원합니다. 내 이미지를 URL에서 가져 와서 프로그래밍 방식으로 비트 맵으로 만듭니다. 내 비트 맵 이미지를 반환하는 메서드를 호출합니다.
아이디어가 있으십니까?