以编程方式在Edit中定位EditText组件？

Question

如何在运行时动态定位编辑文本？

followig是我的代码：

public class ABCActivity extends Activity   {
  EditText ed;

  @Override
  public void onCreate(Bundle savedInstanceState) 
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ed = new EditText(ABCActivity.this);
    ed.setEnabled(false);    
    layout =new LinearLayout(this);  
    LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT, 1.0f);            
    layout.setLayoutParams(params);
    btn = new Button(this); 
    btn.setLayoutParams(params);
    btn.setText("Change");

    RelativeLayout.LayoutParams params2 = (RelativeLayout.LayoutParams) ed.getLayoutParams();
    params2.leftMargin = 10;
    params2.topMargin = 10;
    ed.setLayoutParams(params2);

    layout.addView(btn);   
    layout.addView(ed);

   }    
}

让力量接近：

RelativeLayout.LayoutParams params2 = (RelativeLayout.LayoutParams) ed.getLayoutParams();

错误：空指针异常 我尝试使用相对布局..... 但是不起作用

Answer 1

Lars Vogel here有一个很好的教程。基本上，您必须使用特定于布局的LayoutParams来通过Java定位视图。

Answer 2

你可以通过这种方式设置EditText的位置，我给它的值为10,10。

         RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) ed.getLayoutParams();
         params.leftMargin = 10;
         params.topMargin = 10;
         ed.setLayoutParams(params);