如果用户向左或向右滑动（图形计算器，十六进制，矩阵......），我正在使用一些计算器源代码和应用程序有不同的视图但是当我刷我的应用程序时遇到此错误：
FATAL EXCEPTION: main
Process: calculator.app, PID: 15758
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:933)
at android.graphics.Bitmap.createBitmap(Bitmap.java:912)
at android.graphics.Bitmap.createBitmap(Bitmap.java:879)
at com.android2.calculator3.view.Cling.dispatchDraw(Cling.java:117)
at android.view.View.updateDisplayListIfDirty(View.java:15134)
at android.view.View.getDisplayList(View.java:15162)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3687)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3666)
at android.view.View.updateDisplayListIfDirty(View.java:15099)
at android.view.View.getDisplayList(View.java:15162)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3687)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3666)
at android.view.View.updateDisplayListIfDirty(View.java:15099)
at android.view.View.getDisplayList(View.java:15162)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3687)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3666)
at android.view.View.updateDisplayListIfDirty(View.java:15099)
at android.view.View.getDisplayList(View.java:15162)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3687)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3666)
at android.view.View.updateDisplayListIfDirty(View.java:15099)
at android.view.View.getDisplayList(View.java:15162)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:275)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:281)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:320)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2751)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2584)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2176)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1191)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6642)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
at android.view.Choreographer.doCallbacks(Choreographer.java:590)
at android.view.Choreographer.doFrame(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:763)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
这是来自Cling.java类的代码
public class Cling extends FrameLayout {
public static final int SHOW_CLING_DURATION = 600;
public static final int DISMISS_CLING_DURATION = 250;
public static final String SIMPLE_CLING_DISMISSED_KEY = "cling.simple.dismissed";
public static final String MATRIX_CLING_DISMISSED_KEY = "cling.matrix.dismissed";
public static final String HEX_CLING_DISMISSED_KEY = "cling.hex.dismissed";
public static final String GRAPH_CLING_DISMISSED_KEY = "cling.graph.dismissed";
private Calculator mCalculator;
private boolean mIsInitialized;
private Drawable mBackground;
private Drawable mPunchThroughGraphic;
private Drawable mHandTouchGraphic;
private int mPunchThroughGraphicCenterRadius;
private float mRevealRadius;
private int[] mPositionData;
private boolean mShowHand;
private boolean mDismissed;
private Paint mErasePaint;
public Cling(Context context) {
this(context, null, 0);
}
public Cling(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public Cling(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void init(Calculator c, int[] positionData, float revealRadius, boolean showHand) {
if(!mIsInitialized) {
mCalculator = c;
mPositionData = positionData;
mShowHand = showHand;
mDismissed = false;
Resources r = getContext().getResources();
mPunchThroughGraphic = r.getDrawable(R.drawable.cling);
mPunchThroughGraphicCenterRadius = r.getDimensionPixelSize(R.dimen.clingPunchThroughGraphicCenterRadius);
mRevealRadius = revealRadius;
mErasePaint = new Paint();
mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
mErasePaint.setColor(0xFFFFFF);
mErasePaint.setAlpha(0);
mIsInitialized = true;
}
}
public void dismiss() {
mDismissed = true;
}
boolean isDismissed() {
return mDismissed;
}
public void cleanup() {
mBackground = null;
mPunchThroughGraphic = null;
mHandTouchGraphic = null;
mIsInitialized = false;
}
private int[] getPunchThroughPosition() {
if(mPositionData != null) {
return mPositionData;
}
return new int[] { -1, -1, -1 };
}
@Override
public boolean onTouchEvent(android.view.MotionEvent event) {
int[] pos = getPunchThroughPosition();
double diff = Math.sqrt(Math.pow(event.getX() - pos[0], 2) + Math.pow(event.getY() - pos[1], 2));
if(diff < mRevealRadius) {
return false;
}
return true;
};
@Override
protected void dispatchDraw(Canvas canvas) {
if(mIsInitialized) {
DisplayMetrics metrics = new DisplayMetrics();
mCalculator.getWindowManager().getDefaultDisplay().getMetrics(metrics);
// Initialize the draw buffer (to allow punching through)
Bitmap b = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
// Draw the background
if(mBackground == null) {
mBackground = getResources().getDrawable(R.drawable.bg_cling);
}
if(mBackground != null) {
mBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight());
mBackground.draw(c);
}
else {
c.drawColor(0x99000000);
}
int cx = -1;
int cy = -1;
int cz = -1;
float scale = mRevealRadius / mPunchThroughGraphicCenterRadius;
int dw = (int) (scale * mPunchThroughGraphic.getIntrinsicWidth());
int dh = (int) (scale * mPunchThroughGraphic.getIntrinsicHeight());
// Determine where to draw the punch through graphic
Rect rect = new Rect();
Window window = ((Activity) getContext()).getWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rect);
int statusBarHeight = rect.top;
int[] pos = getPunchThroughPosition();
cx = pos[0];
cy = pos[1] - statusBarHeight;
cz = pos[2];
if(cx > -1 && cy > -1 && scale > 0) {
c.drawCircle(cx, cy, mRevealRadius, mErasePaint);
mPunchThroughGraphic.setBounds(cx - dw / 2, cy - dh / 2, cx + dw / 2, cy + dh / 2);
mPunchThroughGraphic.draw(c);
}
// Draw the hand graphic
if(mShowHand) {
if(mHandTouchGraphic == null) {
mHandTouchGraphic = getResources().getDrawable(R.drawable.hand);
}
int offset = cz;
mHandTouchGraphic.setBounds(cx + offset, cy + offset, cx + mHandTouchGraphic.getIntrinsicWidth() + offset,
cy + mHandTouchGraphic.getIntrinsicHeight() + offset);
mHandTouchGraphic.draw(c);
}
canvas.drawBitmap(b, 0, 0, null);
c.setBitmap(null);
b = null;
}
// Draw the rest of the cling
super.dispatchDraw(canvas);
};
}
我在编程方面是初学者，但如果我理解了这一行中出错的话
Bitmap b = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(), Bitmap.Config.ARGB_8888);
我正在尝试实施此方法：
public void run() {
// display ShowcaseView here
}
但没有任何成功。我不知道该怎么办？任何建议，请完全初学者:)
答案 0 :(得分：0)
尝试插入：
Log.i("Width: ", Integer.toString(getMeasuredWidth()));
Log.i("Height: ", Integer.toString(getMeasuredHeight()));
就在你的行前：
Bitmap b = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(), Bitmap.Config.ARGB_8888);
这样，您可以检查getMeasuredWidth()和getMeasuredHeight()的值，以确认它们等于或小于零，然后继续追踪原因。
希望这有帮助，祝你好运！