动态添加控件

1、RelativeLayout布局

RelativeLayout layout = new RelativeLayout(this);
layout.setLayoutParams(new RelativeLayout.LayoutParams(-1, -1));
TextView mView = new TextView(this);
mView.setId(2);
mView.setText("this is a test text!");

layout.addView(mView);

 

  Button btn=new Button(this);
  btn.setText("调用子页面");
  btn.setGravity(Gravity.CENTER);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(
-2, -2);
// layoutParams.setMargins(100, 100, 100, 100);
layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, -1);

layout.addView(mView, btn);
上例是将一个btn添加到RelativeLayout的底部。你可以把注释行取消掉，把下一行注释，再看下效果。

2、LinearLayout布局

LinearLayout linear=new LinearLayout(this);
  linear.setOrientation(LinearLayout.VERTICAL);
  
  TextView tv = new TextView(this);
  tv.setText("This is D Activity!");
  tv.setGravity(Gravity.CENTER);

  LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
    LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
  lp.weight = 1.0f;
  linear.setLayoutParams(lp);
  linear.addView(tv,lp);//给TextView加Weight属性

  //按钮没有设置Weight属性，将显示在最下面
  Button btn=new Button(this);
  btn.setText("调用子页面");
  btn.setGravity(Gravity.CENTER);

  linear.addView(btn);
  btn.setOnClickListener(this);
  setContentView(linear);