我想移动并缩放右侧的视图，同时将其拖动到左侧。我尝试在触摸时设置此视图的布局参数。它移动并缩放视图。但是移动手指时渲染不正确快速向左右两侧。
右侧的此视图是自定义布局扩展LinearLayout，其中ListView为子项。左侧也是另一种布局，并将两种布局集成到Framelayout（类似）滑动菜单。）
有没有办法在不更新LayoutParams的情况下渲染视图（移动和缩放）？
是否可以使用画布和矩阵更新布局？
以下是右侧视图（小视图）的自定义布局代码。
public class SlidingLayout extends LinearLayout {
private static String LOG_TAG = "SlidingLayout";
private boolean isTranformed = false;
private PanGestureListener gestureListener;
private GestureDetector gestureDetector;
private boolean isAnimating = false;
private boolean isScrolling = false;
private DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
private Matrix matrix = new Matrix();
private float posX = 0;
private float posY = 0;
public CustomSlidingLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
private void init(Context context){
gestureListener = new PanGestureListener();
gestureDetector = new GestureDetector(context, gestureListener);
matrix.setTranslate(0, 0);
matrix.setScale(1.0f, 1.0f);
}
@Override
protected void onDraw(Canvas canvas) {
//canvas.save();
/*canvas.drawColor(Color.RED);
canvas.translate(posX, posY);
super.onDraw(canvas);*/
/*canvas.restore();
matrix.reset();
matrix = canvas.getMatrix();*/
/*if (isTranformed) {
matrix.postTranslate(posX, posY);
canvas.setMatrix(matrix);
}
super.onDraw(canvas);*/
}
private void makeViewSmall() {
if (!isAnimating) {
isAnimating = true;
Rect rect = new Rect();
getLocalVisibleRect(rect);
ResizeMoveAnimation anim = new ResizeMoveAnimation(this,
(int) (displayMetrics.widthPixels * 0.8), displayMetrics.heightPixels / 4,
displayMetrics.widthPixels * 2, rect.bottom - displayMetrics.heightPixels
/ 4);
anim.setAnimationListener(animationListener);
anim.setDuration(1000);
anim.setInterpolator(new BounceInterpolator());
startAnimation(anim);
}
}
public void makeViewOriginal() {
if(isTranformed){
if (!isAnimating) {
isAnimating = true;
ResizeMoveAnimation anim = new ResizeMoveAnimation(this, 0, 0,
displayMetrics.widthPixels, displayMetrics.heightPixels);
anim.setAnimationListener(animationListener);
anim.setInterpolator(new BounceInterpolator());
anim.setDuration(1000);
startAnimation(anim);
}
}else{
makeViewSmall();
}
}
private AnimationListener animationListener = new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) CustomSlidingLayout.this .getLayoutParams();
if (isTranformed) {
isTranformed = false;
params.leftMargin = 0;
params.topMargin = 0;
params.width = displayMetrics.widthPixels;
params.height = displayMetrics.heightPixels;
requestLayout();
} else {
isTranformed = true;
}
isAnimating = false;
}
};
class PanGestureListener extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onSingleTapConfirmed(MotionEvent event) {
if (isTranformed) {
makeViewOriginal();
return true;
}
return false;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (isTranformed) {
return true;
} else {
return false;
}
}
private int _xDelta = 0;
private int _yDelta = 0;
@Override
public boolean onTouchEvent(MotionEvent event) {
//gestureDetector.onTouchEvent(event);
if (isTranformed) {
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
this.requestLayout();
FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) this .getLayoutParams();
if (layoutParams.leftMargin == 0 && layoutParams.topMargin == 0) {
//this.requestLayout();
isTranformed = false;
isScrolling = false;
break;
}
isScrolling = true;
int xDiff = layoutParams.leftMargin - (X - _xDelta);
layoutParams.leftMargin = X - _xDelta;
int scaleFactor = layoutParams.leftMargin > 0 ? layoutParams.leftMargin : 1;
layoutParams.topMargin = layoutParams.topMargin - ((layoutParams.topMargin / scaleFactor) * xDiff);
if (layoutParams.leftMargin < 0) {
layoutParams.leftMargin = 0;
}
if (layoutParams.topMargin < 0) {
layoutParams.topMargin = 0;
}
layoutParams.width = (displayMetrics.widthPixels - layoutParams.leftMargin);
layoutParams.height = (displayMetrics.heightPixels - (layoutParams.topMargin * 2));
this.requestLayout();
/*final float dx = X - _xDelta;
final float dy = Y - _yDelta;
posX += dx;
posY += dy;
//matrix.postScale(scaleFactor, scaleFactor,0.0f,0.5f);
Bitmap bitmap = Bitmap.createBitmap((int)(displayMetrics.widthPixels - posX), (int)(displayMetrics.heightPixels - posY), Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
matrix.postTranslate(posX, posY);
canvas.setMatrix(matrix);
this.draw(canvas);
_xDelta = X;
_yDelta = Y;
invalidate();*/
break;
case MotionEvent.ACTION_UP:
isScrolling = false;
break;
case MotionEvent.ACTION_DOWN:
FrameLayout.LayoutParams lParams = (FrameLayout.LayoutParams) this
.getLayoutParams();
_xDelta = X - lParams.leftMargin;
_yDelta = X - lParams.topMargin;
posX = 0;
posY = 0;
break;
}
return true;
}
return true;
}
}
答案 0 :(得分：0)
您可以致电invalidate()中的onTouch()来执行onDraw()中的代码以重绘视图。
invalidate（）将强制绘制视图。