My custom view is a slider, it follows the rules for onMeasure()
when choosing the view height, when MeasureSpec
is EXACTLY it sets the spec size, when it is UNSPECIFIED it sets a use defined size, when it is AT_MOST it chooses the minimum between them.
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int specHeight = Math.max(BOX_MIN_HEIGHT, MeasureSpec.getSize(heightMeasureSpec));
int specWidth = MeasureSpec.getSize(widthMeasureSpec);
int desiredHeight = Math.max(BOX_MIN_HEIGHT, HSVColorPickerPreference.this.boxHeight);
int chosenHeight = 0;
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if( heightMode == MeasureSpec.UNSPECIFIED ) {
chosenHeight = desiredHeight;
} else if( heightMode == MeasureSpec.AT_MOST ) {
chosenHeight = Math.min(specHeight, desiredHeight); <<< BAD results
//chosenHeight = specHeight; <<< GOOD results
} else if( heightMode == MeasureSpec.EXACTLY ) {
chosenHeight = specHeight;
}
setMeasuredDimension(specWidth, chosenHeight);
But this causes the view not to be drawn at all (onDraw()
is not called)
If I uncomment the commented line for AT_MOST then the view is drawn.
The sliders are part of a LinearLayout containing 2 sliders and one View box, each one has the attribute layout_weight="1"
set (see the images below).
Below I show you the good and bad logs and images (there are two sliders and 1 View below them):
GOOD:
BAD:
GOOD Log (see last lines, call to onDraw()
):
03-26 08:06:10.288: D/AlphaSlider(9223): + onSizeChanged(w:579, h:58, oldw:0, oldh:0)
03-26 08:06:10.288: D/AlphaSlider(9223): + onLayout(changed:true, left:10, top:10, right:589, bottom:68)
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073742185)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=361, desiredSise=40, chosenSize=361
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:-2147483080)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=568, desiredSise=40, chosenSize=568
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073742000)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=176, desiredSise=40, chosenSize=176
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073742098)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=274, desiredSise=40, chosenSize=274
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:-2147483342)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=306, desiredSise=40, chosenSize=306
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073741913)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=89, desiredSise=40, chosenSize=89
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073742098)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=274, desiredSise=40, chosenSize=274
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:-2147483342)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=306, desiredSise=40, chosenSize=306
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073741913)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=89, desiredSise=40, chosenSize=89
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742185)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=361, desiredSise=40, chosenSize=361
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483123)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=525, desiredSise=40, chosenSize=525
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741986)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=162, desiredSise=40, chosenSize=162
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742098)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=274, desiredSise=40, chosenSize=274
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483385)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=263, desiredSise=40, chosenSize=263
03-26 08:06:10.288: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741898)
03-26 08:06:10.288: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=74, desiredSise=40, chosenSize=74
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742169)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=345, desiredSise=40, chosenSize=345
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483173)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=475, desiredSise=40, chosenSize=475
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741969)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=145, desiredSise=40, chosenSize=145
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742081)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=257, desiredSise=40, chosenSize=257
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483435)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=213, desiredSise=40, chosenSize=213
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741882)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=58, desiredSise=40, chosenSize=58
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742081)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=257, desiredSise=40, chosenSize=257
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483435)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec AT_MOST, specSize=213, desiredSise=40, chosenSize=213
03-26 08:06:10.315: D/AlphaSlider(9223): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741882)
03-26 08:06:10.315: W/AlphaSlider(9223): MeasureSpec EXACTLY, specSize=58, desiredSise=40, chosenSize=58
03-26 08:06:10.315: D/AlphaSlider(9223): + onLayout(changed:false, left:10, top:10, right:589, bottom:68)
03-26 08:06:10.323: D/AlphaSlider(9223): + onDraw()
BAD Log (no call to onDraw()
):
03-26 07:43:33.453: D/AlphaSlider(8145): + onSizeChanged(w:579, h:30, oldw:0, oldh:0)
03-26 07:43:33.463: D/AlphaSlider(8145): + onLayout(changed:true, left:10, top:10,right:589,bottom:40)
03-26 07:43:33.463: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073742185)
03-26 07:43:33.463: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=361, desiredSise=40, chosenSize=361
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:-2147483080)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=568, desiredSise=40, chosenSize=40
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073741824)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073742098)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=274, desiredSise=40, chosenSize=274
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:-2147483342)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=306, desiredSise=40, chosenSize=40
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073741824)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073742098)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=274, desiredSise=40, chosenSize=274
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:-2147483342)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=306, desiredSise=40, chosenSize=40
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742360, heightMeasureSpec:1073741824)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742185)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=361, desiredSise=40, chosenSize=361
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483123)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=525, desiredSise=40, chosenSize=40
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741824)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742098)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=274, desiredSise=40, chosenSize=274
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483385)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=263, desiredSise=40, chosenSize=40
03-26 07:43:33.473: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741824)
03-26 07:43:33.473: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742169)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=345, desiredSise=40, chosenSize=345
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483173)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=475, desiredSise=40, chosenSize=40
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741824)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742081)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=257, desiredSise=40, chosenSize=257
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483435)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=213, desiredSise=40, chosenSize=40
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741824)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073742081)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=257, desiredSise=40, chosenSize=257
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:-2147483435)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec AT_MOST, specSize=213, desiredSise=40, chosenSize=40
03-26 07:43:33.503: D/AlphaSlider(8145): + onMeasure(widthMeasureSpec:1073742403, heightMeasureSpec:1073741824)
03-26 07:43:33.503: W/AlphaSlider(8145): MeasureSpec EXACTLY, specSize=30, desiredSise=40, chosenSize=30
03-26 07:43:33.503: D/AlphaSlider(8145): + onLayout(changed:false, left:10, top:10, right:589, bottom:40)