android 设置图片小妙招 setCompoundDrawables与setCompoundDrawablesWithIntrinsicBounds
2018-01-26 15:56
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手工设置文本与图片相对位置时,常用到如下方法:
意思是设置Drawable显示在text的左、上、右、下位置。
但是两者有些区别:
setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom)
api原文为:
Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables’ bounds will be set to their intrinsic bounds.
意思大概就是:可以在上、下、左、右设置图标,如果不想在某个地方显示,则设置为null。图标的宽高将会设置为固有宽高,既自动通过getIntrinsicWidth和getIntrinsicHeight获取。
setCompoundDrawables(left, top, right, bottom)
api原文为:
Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables must already have had setBounds(Rect) called.
意思大概就是:可以在上、下、左、右设置图标,如果不想在某个地方显示,则设置为null。但是Drawable必须已经setBounds(Rect)。意思是你要添加的资源必须已经设置过初始位置、宽和高等信息。
这下就明白了,这个方法要先给Drawable设置setBounds(x,y,width,height);
x:组件在容器X轴上的起点 y:组件在容器Y轴上的起点 width:组件的长度 height:组件的高度。
如代码:
总结:设置不同方位的图标的方法有以上两种,
如果想手动设置大小的话就要用setCompoundDrawables,事先要给Drawable设置setBounds。
如果按照原有比例大小显示图片就使用setCompoundDrawablesWithIntrinsicBounds
setCompoundDrawables(left, top, right, bottom) setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom)
意思是设置Drawable显示在text的左、上、右、下位置。
但是两者有些区别:
setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom)
api原文为:
Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables’ bounds will be set to their intrinsic bounds.
意思大概就是:可以在上、下、左、右设置图标,如果不想在某个地方显示,则设置为null。图标的宽高将会设置为固有宽高,既自动通过getIntrinsicWidth和getIntrinsicHeight获取。
setCompoundDrawables(left, top, right, bottom)
api原文为:
Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables must already have had setBounds(Rect) called.
意思大概就是:可以在上、下、左、右设置图标,如果不想在某个地方显示,则设置为null。但是Drawable必须已经setBounds(Rect)。意思是你要添加的资源必须已经设置过初始位置、宽和高等信息。
这下就明白了,这个方法要先给Drawable设置setBounds(x,y,width,height);
x:组件在容器X轴上的起点 y:组件在容器Y轴上的起点 width:组件的长度 height:组件的高度。
如代码:
Resources res = TabTest.this.getResources(); Drawable myImage = res.getDrawable(R.drawable.home); myImage.setBounds(1, 1, 100, 100); button.setCompoundDrawables(null, myImage, null, null);
总结:设置不同方位的图标的方法有以上两种,
如果想手动设置大小的话就要用setCompoundDrawables,事先要给Drawable设置setBounds。
如果按照原有比例大小显示图片就使用setCompoundDrawablesWithIntrinsicBounds
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