[英]Can't set layout gravity for RelativeLayout programmatically
嘗試#1 :我正在嘗試以編程方式為RelativeLayout
設置布局重力。
FrameLayout frameLayout = new FrameLayout(this);
FrameLayout.LayoutParams frameLayoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
frameLayout.setLayoutParams(frameLayoutParams);
setViewPaddingInDp(frameLayout, 16, 16, 16, 16);
RelativeLayout relativeLayout = new RelativeLayout(this);
LinearLayout.LayoutParams relativeLayoutParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
relativeLayoutParams.gravity = Gravity.CENTER;
relativeLayout.setLayoutParams(relativeLayoutParams);
frameLayout.addView(relativeLayout);
ImageView imageView = new ImageView(this);
setViewWidthAndHeight(imageView, 128, 192);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setImageResource(R.drawable.maxwell);
relativeLayout.addView(imageView);
setContentView(frameLayout);
這就是我得到的結果:
嘗試#2 :我嘗試CENTER_IN_PARENT
編程方式設置CENTER_IN_PARENT
,但沒有結果
RelativeLayout relativeLayout = new RelativeLayout(this);
RelativeLayout.LayoutParams relativeLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
relativeLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
relativeLayout.setLayoutParams(relativeLayoutParams);
frameLayout.addView(relativeLayout);
嘗試#3 :還嘗試設置CENTER_HORIZONTAL
,但沒有效果:
RelativeLayout relativeLayout = new RelativeLayout(this);
RelativeLayout.LayoutParams relativeLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
relativeLayoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
// relativeLayoutParams.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);
// relativeLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
relativeLayout.setLayoutParams(relativeLayoutParams);
frameLayout.addView(relativeLayout);
如何為RelativeLayout
設置布局重力CENTER
? 我需要在不更改FrameLayout
或ImageView
布局參數的情況下為RelativeLayout
設置重力。
解決方法是這里,只是驗證了我自己。 按要求工作。 我們缺少的重要部分是imageViewParam.addRule(RelativeLayout.CENTER_HORIZONTAL);
FrameLayout frameLayout = new FrameLayout(this);
FrameLayout.LayoutParams frameLayoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
frameLayout.setLayoutParams(frameLayoutParams);
//setViewPaddingInDp(frameLayout, 16, 16, 16, 16);
RelativeLayout relativeLayout = new RelativeLayout(this);
RelativeLayout.LayoutParams relativeLayoutParams = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
relativeLayoutParams.addRule(CENTER_IN_PARENT, TRUE);
relativeLayout.setLayoutParams(relativeLayoutParams);
frameLayout.addView(relativeLayout);
ImageView imageView = new ImageView(this);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.CENTER_HORIZONTAL);
imageView.setLayoutParams(params);
// params.addRule(RelativeLayout.CENTER_IN_PARENT);
// params.addRule(RelativeLayout.CENTER_VERTICAL);
// setViewWidthAndHeight(imageView, 128, 192); // if you are using this method, then set the layout param accordingly
// imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setImageResource(R.drawable.maxwell);
relativeLayout.addView(imageView);
setContentView(frameLayout);
將MATCH_PARENT
而不是WRAP_CONTENT
設置為RelativeLayout,例如
RelativeLayout.LayoutParams relativeLayoutParams = new
RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT);
並將RelativeLayout.LayoutParams
設置為您的ImageView
RelativeLayout.LayoutParams layoutParams =
(RelativeLayout.LayoutParams) imageView.getLayoutParams();
layoutParams.addRule(RelativeLayout.CENTER_IN_PARENT,
RelativeLayout.TRUE);
imageView.setLayoutParams(layoutParams);
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