如何以编程方式调整自定义视图的大小？

Question

我正在编写一个自定义视图,从RelativeLayout扩展,我想以编程方式调整它,我该怎么办？

自定义视图类是这样的:

public ActiveSlideView(Context context, AttributeSet attr){
        super(context, attr);
        LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if(inflater != null){       
            inflater.inflate(R.layout.active_slide, this);
        }

Answer 1

如果您错过了布局的高度或宽度,Android会抛出异常.而不是创建一个新的LayoutParams对象使用视图的原始对象,这样保留所有其他设置参数:

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) someLayout.getLayoutParams();
params.height = 130;
someLayout.setLayoutParams(params);

Answer 2

this.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, theSizeIWant));

问题解决了!

注意:请务必使用父布局LayoutParams.我的是LinearLayout.LayoutParams!

Answer 3

这对我有用:

ViewGroup.LayoutParams params = layout.getLayoutParams();
params.height = customHeight;
layout.requestLayout();

Answer 4

对于它的价值,假设您想要在设备无关像素(dp)中调整视图的大小: -

您需要使用一个名为的方法applyDimension,该方法是类的成员,TypedValue可以将像素转换为dps.所以,如果我想将高度设置为150dp(比方说) - 那么我可以这样做:

float pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 150, getResources().getDisplayMetrics());
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) someLayout.getLayoutParams();
params.height = (int) pixels;
someLayout.setLayoutParams(params);

表达式:getResources().getDisplayMetrics()获取屏幕密度/分辨率

Answer 5

在 Kotlin 中，您可以使用ktx 扩展：

yourView.updateLayoutParams {
   height = <YOUR_HEIGHT>
}

Answer 6

以下是来自@herbertD的上述解决方案的更通用版本:

private void resizeView(View view, int newWidth, int newHeight) { 
    try { 
        Constructor<? extends LayoutParams> ctor = view.getLayoutParams().getClass().getDeclaredConstructor(int.class, int.class); 
        view.setLayoutParams(ctor.newInstance(newWidth, newHeight));   
    } catch (Exception e) { 
        e.printStackTrace(); 
    }
}

Answer 7

尝试这个:

...
View view = inflater.inflate(R.layout.active_slide, this);
view.setMinimumWidth(200);

Answer 8

我用这种方法来增加自定义视图的宽度

customDrawingView.post(new Runnable() {
                            @Override
                            public void run() {
                                View view_instance = customDrawingView;
                                android.view.ViewGroup.LayoutParams params = view_instance
                                        .getLayoutParams();
                                int newLayoutWidth = customDrawingView
                                        .getWidth()
                                        + customDrawingView.getWidth();
                                params.width = newLayoutWidth;
                                view_instance.setLayoutParams(params);
                                screenWidthBackup = params.width;
                            }
                        });

Answer 9

对于 Kotlin 并使用 dp 单位：

myView.updateLayoutParams {
    val pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 200f, context.resources.displayMetrics)
    height = pixels.toInt()
}