使用 setLayoutParams() 但它不起作用
我创建了一个自定义视图-MyImageView-在其中绘制位图，我使用 setLayoutParams() 来设置我的视图的宽度和高度，但它不起作用，我使用 log 来跟踪我的视图的宽度和高度，我发现两者其中都是0，为什么宽度和高度不都是300？这是我的主要活动代码的一部分：
myCanvas=new MyImageView(CanvasTest3Activity.this,Path);
LinearLayout.LayoutParams p=new LinearLayout.LayoutParams(300,300);
myCanvas.setLayoutParams(p);
这是我的 MyImageView 代码的一部分：
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentwidth=MeasureSpec.getSize(widthMeasureSpec);
int parentHeight=MeasureSpec.getSize(heightMeasureSpec);
int mywidth=(int)(parentHeight*0.5);
setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),mywidth);
}
I create a custom view-MyImageView-to draw a bitmap in it,i use setLayoutParams() to set my view's width and height,but it doesn't work,i use log to track my view's width and height,i found that both of them are 0,why the width and height are not both 300? here's part of my main activity code:
myCanvas=new MyImageView(CanvasTest3Activity.this,Path);
LinearLayout.LayoutParams p=new LinearLayout.LayoutParams(300,300);
myCanvas.setLayoutParams(p);
here's part of my MyImageView 's code:
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentwidth=MeasureSpec.getSize(widthMeasureSpec);
int parentHeight=MeasureSpec.getSize(heightMeasureSpec);
int mywidth=(int)(parentHeight*0.5);
setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),mywidth);
}
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您需要获取父视图并使用 add 方法添加您的视图+视图参数。类似于：
“ParentViewInstance.add(this_is_my_child_view, this_is_the_layout_params_for_my_child_view)”
这意味着子视图的 LayoutParams 的类型应该与 ParentView LayoutParams 的类型相同。查看代码示例的答案。
You need to get the parent View and use the add method to add your view + your view params. Something like:
"ParentViewInstance.add(this_is_my_child_view, this_is_the_layout_params_for_my_child_view)"
This means that the type of the LayoutParams of your child view, should be the same type as the ParentView LayoutParams. Take a look at this answers for code samples.