android 使用代码实现 RelativeLayout布局

只需把代码copy进入oncreate方法即可运行

Java代码


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);