Question

Android中view 怎样通过代码设置 layout

Answer 1

View v = findViewById(R.id.view);
		ViewTreeObserver vto = v.getViewTreeObserver();
		vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
			
			@Override
			public void onGlobalLayout() {
				// TODO Auto-generated method stub
				v.getViewTreeObserver().removeGlobalOnLayoutListener(this);
				LayoutParams lp = v.getLayoutParams();
				lp.width = getWindowManager().getDefaultDisplay().getWidth();
				lp.height = lp.width/2;
				v.setLayoutParams(lp);
				
			}
		});

Answer 2

首先需要确定这个view的父容器是什么，如果是LinearLayout，就声明一个LinearLayout.LayoutParams,然后设置宽高、margin、padding之类的属性。如果是RelativeLayout，就声明一个RelativeLayout.LayoutParams
然后view.setParams就行了，如下代码示例:
myView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT, 1.0f));