我们平常可以直接在xml里设置margin,如:
<ImageView android:layout_margin="5dip" android:src="@drawable/image" />
但是有些情况下,需要在java代码里来写,可是View本身没有setMargin方法,怎么办呢?
通过查阅android api,我们发现android.view.ViewGroup.MarginLayoutParams有个方法setMargins(left, top, right, bottom).
其直接的子类有: FrameLayout.LayoutParams, LinearLayout.LayoutParams and RelativeLayout.LayoutParams.
使用方法:
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(10, 20, 30, 40);
imageView.setLayoutParams(lp);
原文:http://greatverve.cnblogs.com/archive/2012/01/29/android-margin.html
android 使用代码实现 RelativeLayout布局
RelativeLayout rl = new RelativeLayout(this); Button btn1 = new Button(this); btn1.setText("----------------------"); btn1.setId(1); RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); lp1.addRule(RelativeLayout.ALIGN_PARENT_TOP); lp1.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE); // btn1 位于父 View 的顶部,在父 View 中水平居中 rl.addView(btn1, lp1 ); Button btn2 = new Button(this); btn2.setText("|\n|\n|\n|\n|\n|"); btn2.setId(2); RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); lp2.addRule(RelativeLayout.BELOW, 1); lp2.addRule(RelativeLayout.ALIGN_LEFT, 1); // btn2 位于 btn1 的下方、其左边和 btn1 的左边对齐 rl.addView(btn2, lp2); Button btn3 = new Button(this); btn3.setText("|\n|\n|\n|\n|\n|"); btn3.setId(3); RelativeLayout.LayoutParams lp3 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); lp3.addRule(RelativeLayout.BELOW, 1); lp3.addRule(RelativeLayout.RIGHT_OF, 2); lp3.addRule(RelativeLayout.ALIGN_RIGHT, 1); // btn3 位于 btn1 的下方、btn2 的右方且其右边和 btn1 的右边对齐(要扩充) rl.addView(btn3,lp3); Button btn4 = new Button(this); btn4.setText("--------------------------------------------"); btn4.setId(4); RelativeLayout.LayoutParams lp4 = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); lp4.addRule(RelativeLayout.BELOW, 2); lp4.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE); // btn4 位于 btn2 的下方,在父 Veiw 中水平居中 rl.addView(btn4,lp4); setContentView(rl);
原文:http://kukuqiu.iteye.com/blog/1018396
动态修改RelativeLayout的宽高:
参数可以.属性设置,但数值是像素,需要转化为dp单位。
RelativeLayout.LayoutParams linearParams = (RelativeLayout.LayoutParams)rela_addnote_notetype.getLayoutParams(); linearParams.height = 44; rela_addnote_notetype.setLayoutParams(linearParams);
原文:http://blog.csdn.net/chenguang79/article/details/37874793
Android适配所需知识点LayoutParams:
http://www.android100.org/html/201406/05/18971.html