我正在开发类似于刮刮卡的Android项目。 我在RelativeLayout中有两个图层。底层包含ImageView,顶层包含SurfaceView。
问题是即使我设置canvas.drawColor(Color.TRANSPARENT)
,显示屏也会保持黑色并且不会显示ImageView。
如果我想划痕并擦除SurfaceView的部分并显示下面的ImageView,我该怎么办?
提前致谢。我很抱歉英语不好。
这是我的布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background"
android:padding="10dp"
android:id="@+id/layoutama"
>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<ImageButton
android:id="@+id/reset"
android:src="@drawable/refresh_btn"
android:background="@null"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/logo"
android:paddingTop="10dp"
android:paddingRight="8dp"
/>
<ImageButton
android:id="@+id/back"
android:src="@drawable/back_btn"
android:background="@null"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/reset"
android:paddingTop="10dp"
/>
<ImageView
android:id="@+id/logo"
android:src="@drawable/icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</RelativeLayout>
<AbsoluteLayout
android:id="@+id/absolayo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<RelativeLayout
android:id="@+id/relatlayo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="@drawable/image1"
android:scaleType="fitXY"
/>
<coba.ngegosok.MainGambar
android:id="@+id/LayoDalam"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</RelativeLayout>
</AbsoluteLayout>
</LinearLayout>
这是SurfaceView代码:
protected void onDraw(Canvas canvas) {
// fills the canvas with black
canvas.drawColor(Color.TRANSPARENT);
canvas.drawBitmap(eraseableBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, p);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
tw = w;
th = h;
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
private void touch_start(float x, float y) {
mX = x;
mY = y;
mPath.reset();
mPath.moveTo(x, 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, p);
// kill this so we don't double draw
mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
static_x = event.getX();
static_y = event.getY();
if (event.getAction() == MotionEvent.ACTION_DOWN) {
touch_start(static_x, static_y);
} if (event.getAction() == MotionEvent.ACTION_MOVE) {
touch_move(static_x, static_y);
} if (event.getAction() == MotionEvent.ACTION_UP) {
touch_up();
}
return true;
}
答案 0 :(得分:2)
您不应该在SurfaceView后面使用imageView,因为SurfaceView不是像常规视图那样绘制的。表面是Z有序的,因此它位于窗口后面,保持着SurfaceView; SurfaceView在其窗口中打孔以允许其表面显示。
在你的情况下,我会将ImageView放在SurfaceView前面并使用setVisibility(View.VISIBLE);当你想要展示它时。
或者你可以使用myImageView.bringToFront();将它对齐在SurfaceView之上。